18-Nov-18 01:22 AM This is an alignment coil from a TEM, it's used for compensating beam condenser alignment to the optical axis of the virtual objective lens. Instead of moving the coil around using the alignment bolts, you move the ferrite core around. 18-Nov-18 01:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181115_220412-5B431.jpg 20-Nov-18 06:40 AM My vacuum album. https://photos.app.goo.gl/JXUSgQkI30ptcyMi1 20-Nov-18 07:51 AM I have pumps and valves on a cart, hooks to chamber by one KF50. 20-Nov-18 07:51 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181120_100503349-BA742.jpg 20-Nov-18 07:51 AM Process gas side 20-Nov-18 07:51 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181120_103003788-2D05B.jpg 20-Nov-18 07:53 AM love how you made a cooking pot look professional 20-Nov-18 07:53 AM I have argon, and also a zeolite air dryer. 1 MFC for each. Baratron and ion gauge over here. 2 TC gauges on cart for diff pump management. 20-Nov-18 07:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181120_103456379-F87AE.jpg 20-Nov-18 07:53 AM HV supply, I, V meters, and cooling. I use open loop city water, 2 circuits, one for diff pump, one for chamber innards (induction heater or sputtering) 20-Nov-18 07:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181120_103838921-898E3.jpg 20-Nov-18 07:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181120_104143238_HDR-62AE0.jpg 20-Nov-18 07:53 AM Innards of supply. Chinese ZVS inverter, my own transformer, rectifier and output choke (plasma loads happier with a current drive, reduces arcing). No load output about 1kV. Happily puts out 350 mA at 400V. I power with CC/CV bench supply, usually in current mode. 20-Nov-18 09:52 AM Looks super nice! 21-Nov-18 01:30 AM cool 21-Nov-18 03:43 AM @robamacl your setup is so clean and well thought out, i love it! it looks pretty straightforward, but do you have more details or schematics on your HV power supply construction anywhere? 21-Nov-18 04:37 AM Trickiest part is the transformer design. I made the transformer years ago for a bipolar (non-mosfet) self resonant inverter. I'll do a short write up and post a link. 22-Nov-18 07:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181122_163336-3B456.jpg 22-Nov-18 07:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181122_163357-E2FE1.jpg 22-Nov-18 07:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181122_163246-7F576.jpg 22-Nov-18 07:43 AM mini-teardown of a keithley 480 pAmeter 22-Nov-18 09:36 AM Nice! I guess the gold curls on the left near switch mechanism are the switch contacts? 22-Nov-18 10:01 AM Hmm, so there's really not too much in there, aside from the low current section. Power supply, microcontroller, couple lonely DIP packages. I guess the signal section is basically an integrator? 22-Nov-18 10:08 AM Yep, input switches 22-Nov-18 10:08 AM should be a simple TIA a,d buffer 23-Nov-18 01:39 AM didn't tweaked it yet 23-Nov-18 01:39 AM only to get an image 23-Nov-18 01:39 AM yeah, suspended tank i guess 23-Nov-18 01:40 AM Fair. I'm curious if you have the upper condenser apurture in place 23-Nov-18 01:41 AM you mean correctly placed? 23-Nov-18 01:41 AM No just present 23-Nov-18 01:41 AM Mine is noted as removed in the manual and I don't really know why 23-Nov-18 01:42 AM ah ok 23-Nov-18 01:42 AM I'm thinking for eds probe current 23-Nov-18 01:48 AM hmm 23-Nov-18 08:52 AM This is pretty much the last usable image I got of my SEM before the objective lens became unstable. It's of some Boron Nitride nanotubes and is at about 2000-4000X mag. I can probably go well beyond 100,000X with sample with a FEG scope. 23-Nov-18 08:52 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-07A52.png 23-Nov-18 10:39 AM Here's a link to notes on the HV DC plasma supply I made using an ebay ZVS inverter and a custom transformer (above) http://humancond.org/wiki/user/ram/vacuum/dc_supply 23-Nov-18 10:44 AM ahh, ty~! finally i may be able to put my ZVS switcher to good use.. 23-Nov-18 10:51 AM Ooh, a dokuwiki! That's a cool way to organise your stuff. 23-Nov-18 11:01 AM Think you were commenting on the wiki rather than my vacuum setup with the cart above. It's convenient because I can disconnect the chamber easily, or hook pumps to something else, but it really reduces the conductance at high vacuum with the two bends, etc. I think I am getting more like 10 l/s than 100. That's not currently a problem for plasma coating, I would have to throttle it down anyway. 23-Nov-18 11:12 AM Yeah, I wasn't exactly precise in my language. But you guessed correctly. 23-Nov-18 11:14 AM That's cool. I have been thinking about hosting my personal wiki for similar reasons. 23-Nov-18 11:15 AM I actually recommended someone to use a dokuwiki less than a week ago. Cool to see it used in pretty much the way I thought it was 23-Nov-18 11:20 AM It's pretty easy to set up, and I like that the pages are plain text so that I can easily get the data out if I want. 23-Nov-18 11:20 AM i might end up doing exactly that for myself 'cos static site generators are frustrating and i don't think i want or need to reinvent the wheel here 23-Nov-18 11:21 AM Can it be configured for markdown? 23-Nov-18 11:21 AM Nvm, it is pretty much a flavour of markdown 23-Nov-18 11:25 AM Yeah. Just searched, and there is a markdown plugin, no idea how well it works. This wiki is 10 years old, dokuwiki older still. DW is still alive, releases coming out regularly, but not cutting edge. Written in PHP, etc. 23-Nov-18 12:21 PM I've been keeping project stuff in a tiddlywiki lately 23-Nov-18 12:21 PM It's not exactly scalable but it's severless and a single file that I can keep with other files related to whatever project I'm working on 23-Nov-18 07:23 PM https://twitter.com/profanegeometry/status/1066170102645579777?s=19 23-Nov-18 09:44 PM Awesum! 24-Nov-18 12:12 AM funny, I've never had that failure mode 24-Nov-18 12:12 AM for me it was either works or not 24-Nov-18 12:21 AM What are the capacitor values? 24-Nov-18 12:21 AM 35 V 220 µF iirc, very important to be low esr! 24-Nov-18 01:02 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20181124_100142-FE037.jpg 24-Nov-18 01:02 AM I can now load the water reservoir without desmantling everything. 24-Nov-18 01:02 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181124_100424-BDE80.jpg 24-Nov-18 01:09 AM very nice! 24-Nov-18 06:30 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181124_152010-AA499.jpg 24-Nov-18 06:30 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181124_1519332-261D9.jpg 24-Nov-18 06:30 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181124_1522442-AB275.jpg 24-Nov-18 06:41 AM An air-compressor with a negative pressure inlet. I have never used it. The brand seems to have vanished, and "Aeromat" isn't exactly engine-searchable. The plaquette claims it can be continuously used at max load with no maintenance, but I think I should make sure there are no bad surprises before I plug it in. The gauge goes down to -750mm mercury. I'm curious how low the machine will go. It seems to be a piston pump. 24-Nov-18 08:59 AM hehe, cute 24-Nov-18 08:59 AM @AdamMcCombs what's happened to your objective lense? 24-Nov-18 09:05 AM Ohhhh. Put photos of it dismantled @Leona 24-Nov-18 09:44 AM Am going to! Might not get to it today though. 24-Nov-18 12:07 PM naang shaaame naang shaaame 24-Nov-18 12:48 PM Not that I have to defend myself, but I was bedbound yesterday and the basement isn't heated. 24-Nov-18 12:53 PM True... 24-Nov-18 01:00 PM Pinned a message. 24-Nov-18 01:00 PM Pinned a message. 24-Nov-18 01:05 PM ? 24-Nov-18 01:20 PM The Dead Gauge repair was pinned 24-Nov-18 03:14 PM Got my dual hollow cathode sputtering setup together and fired up. 24-Nov-18 03:14 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181123_155117038-43F6C.jpg 24-Nov-18 03:14 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181123_202716101_HDR-45B2F.jpg 24-Nov-18 03:14 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181123_150417892-8479E.jpg 24-Nov-18 03:14 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181123_154956605-A60DC.jpg 24-Nov-18 03:14 PM Top one is titanium, bottom aluminum. I am running with mix of about 90% Ar, 10% dry air. 24-Nov-18 03:14 PM Middle pic shows baseplate with water cooled plate (on KF50). The rest is assembled onto it. Front stainless plate is a "keeper" run at around +10 V, helps to maintain discharge. Cathodes run at -300 to -500. The Ti one is working a lot better, more stable, higher current w/o arcing. 24-Nov-18 06:19 PM @robamacl That's a pretty killer setup. What kind deposition rate can you get with aluminum? 24-Nov-18 11:01 PM @robamacl beautiful 25-Nov-18 03:35 AM I don't have a lot of experience with actually running the thing, or any direct way to measure . 25-Nov-18 03:35 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181125_063317373_HDR-B48D4.jpg 25-Nov-18 03:35 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181125_063123016-7E797.jpg 25-Nov-18 03:48 AM This is from a few hours of messing around with the titanium on glass, oxide, maybe nitride. There are 3-4 color cycles, so maybe 1 um? Colors more vivid in reflection. I don't have any idea yet what flow and gas mix optimize deposition. Or substrate temp and bias. Looking at making a quartz deposition monitor for rapid feedback on the process variable effects. Up to now I've mostly been struggling with electric breakdown between the cathode and the heatsink where the gas feed comes in. I seem to have that under control by using an alumina tube, relieving the heatsink near the center, and using a silicone/fiberglass thermal interface pad. 25-Nov-18 03:55 AM I'm not sure hollow cathode deposition is actually a good idea. Certainly not as uniform, likely not as clean, as magnetron. But it seemed an easy thing to try, where two could fit in my small chamber. I got the idea from some published work on RF hollow cathodes. https://documentcloud.adobe.com/link/track?uri=urn%3Aaaid%3Ascds%3AUS%3A20eb15c1-0138-4f25-a370-711ada9d046f It seems this can be a high rate way to deposit TiN, tho probably not as fast as a standard cathodic arc. 25-Nov-18 03:55 AM The dull colorless inner ring seems to be an area of extra heavy deposition, maybe of micro particles. 25-Nov-18 04:00 AM nice 25-Nov-18 04:08 AM The red on the cathode is thermal glow, so there's definitely something energetic going on inside there. This is a plus for PECVD. Physics of hollow cathodes is a bit complex, but the bottom line is that discharge is sustained at a lower voltage. Pressure inside cathode is higher. UV promotes the discharge at low powers, transition to thermonic emission if it gets hot enough. Also the mechanical confinement helps. 25-Nov-18 04:08 AM This is the basic nozzle design. It has restrictions at both ends. 25-Nov-18 04:08 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181125_071125006-DC342.jpg 25-Nov-18 05:09 AM @robamacl stunningly beautiful. 25-Nov-18 05:09 AM With the plasma so close, could that center section be damaged glass? 25-Nov-18 05:09 AM Also, if your setup is horizontal, how did you got the plasma photo? (Asking for the vacuum chamber shape/material) 25-Nov-18 05:16 AM Might be. Reportedly ion etching can happen in the center, and I can't seem to scrape it off. 25-Nov-18 05:19 AM TiN would be extremely hard, in any case. 25-Nov-18 05:20 AM See nov 20 on this channel for chamber setup. Bell chamber, cooking pot with window on the pot bottom (now the chamber top). 25-Nov-18 05:20 AM My titanium target. (Magnetron) 25-Nov-18 05:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20181125_142006-0DBAD.jpg 25-Nov-18 05:20 AM Ah! The cooking pot, I remember. 25-Nov-18 05:20 AM Adhesion is not that great, tho. You can see scraped area of the film. 25-Nov-18 05:24 AM Hmmmm...then I have no idea. XD. 25-Nov-18 05:56 AM Nixie did you make that magnetron system myself? 25-Nov-18 06:22 AM @a_quiet_scientist wait, what? 25-Nov-18 06:48 AM Titanium sputter target above 25-Nov-18 06:49 AM Where is the "racetrack" in your pic? Inside the gold area? 25-Nov-18 06:49 AM Meaning the erosion area. Or is it the colored area? 25-Nov-18 07:25 AM The "myself" is confusing me. 25-Nov-18 07:25 AM It's a simple plain titanium sheet, not actually a pure titanium target, if that's what you ask. 25-Nov-18 07:25 AM The erosion area is the whole center. I ran it super hot, so Insuspect it etched the whole area. You can see an aluminium target with it's racetrack in the bottom background. 25-Nov-18 05:26 PM The magnetron system - did you build it? 25-Nov-18 06:40 PM @robamacl thats a really awesome setup! Everyone here is making me want to re-explore sputtering gun design again! Very interesting you are using a hollow-cathode gun, that seems much less common than the typical magnetron sputtering systems. 25-Nov-18 06:40 PM I do plan on building and testing some hollow cathode guns, though not for sputtering 25-Nov-18 10:27 PM @a_quiet_scientist yeah, I thought you had seen it on twitter. 25-Nov-18 10:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/whatsapp-image-2018-03-27-at-15-30-323-e15-B26FA.jpeg 25-Nov-18 10:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/img_20180508_165132-F8790.jpg 25-Nov-18 10:27 PM My design is super simple. Glass chamber to use endplates as Anode and Kathode. Kathode holds the magnets outside the vacuum zone and is water refrigerated. 25-Nov-18 10:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181126_073518-2535E.jpg 25-Nov-18 10:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181126_073634-6B68F.jpg 25-Nov-18 10:27 PM And also, a magnetically coupled glass feedthrough: 25-Nov-18 10:27 PM https://youtu.be/N070n2rIq7k 25-Nov-18 11:26 PM There's still some objective instability now, but it's very intermittent and manageable. I am opperating at 100,000x though so there's at least that 25-Nov-18 11:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181125_231641-E9B20.jpg 26-Nov-18 12:31 AM Oh wow, that mechanical feedthrough is awesome! 26-Nov-18 12:45 AM 26-Nov-18 01:22 AM Here a bit more detail about the feedthrough: https://twitter.com/nixie_guy/status/1066984962874851328 26-Nov-18 01:34 AM and a close up of themechanism: 26-Nov-18 01:34 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Ds60UraWsAAIfLM-61BE4.png 26-Nov-18 01:35 AM that's very nice! 26-Nov-18 01:35 AM how did you seal it for both rotary and linear motion? 26-Nov-18 01:36 AM ? 26-Nov-18 01:36 AM Hmm...not sure how to answer that. the linkage between the cable actuated wheels and the inner mechanism is magnetic. 26-Nov-18 01:36 AM so it can rotate and pull up/down as needed. (altough the three tubes have to go up an down simultaneously) 26-Nov-18 01:37 AM ahh, ok 26-Nov-18 01:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Ds60WAUXcAAg-qK-708BF.png 26-Nov-18 01:38 AM is the magnet holder printed, too? 26-Nov-18 01:39 AM nope, machined teflon. 26-Nov-18 01:39 AM anything 3D printed would outgas like underground on flames. 26-Nov-18 01:40 AM that's why I was asking ^^ 26-Nov-18 01:41 AM ^^ 26-Nov-18 01:41 AM everything is press fit, with gas relief for the back of the magnets. 26-Nov-18 01:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-FAA45.png 26-Nov-18 01:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-69DDE.png 26-Nov-18 01:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-EBA7C.png 26-Nov-18 01:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-AC9F9.png 26-Nov-18 01:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-6A801.png 26-Nov-18 01:59 AM Scale bars a way off... 26-Nov-18 02:39 AM The carbide nanotubes? 26-Nov-18 02:40 AM yup 26-Nov-18 02:42 AM The focus problem is just very very intermittent now 26-Nov-18 02:42 AM I left the scopes optics on for about 10 hours then took all of these images. During the 50 minutes acquisition run I had the focus problem once 26-Nov-18 03:39 AM No clues about what could it be? 26-Nov-18 03:40 AM I haven't probed the circuit at all 26-Nov-18 03:40 AM If it gets bad again I will break the scope out and start to take a look 26-Nov-18 03:40 AM First thing is just going to be to probe the output to see if its the lens or drive circuit. 26-Nov-18 06:16 AM For medium to high vacuum, I've had success with ultra-torr o-ring fittings for linear and rotary feed-thru. This is the kind of fitting usually used to attach gauges with tubulation fitting. You may find them on EBAY, but LDS vacuum has a cheap clone. There is not any leakage I can detect (with no motion) at 3e-5 Torr (my lowest pressure). But if you insert the shaft you are putting surface that was just exposed to atmosphere inside the chamber. With the 1/8" shaft there is very little friction force if you use a polished lightly greased shaft. Piston effect from pressure is also not noticeable. 26-Nov-18 06:32 AM Leak detection with ion gauge and dust-off spray. That is, whatever leaking there is at the ultra-Torr is well less than whatever else is going on. These cost $10-$20, so far less than anything sold as a motion feedthru. 27-Nov-18 10:05 AM The semiconductor oven refurbish livestream recording is now on youtube. https://youtu.be/RIBI1ecJ2z0 27-Nov-18 10:18 AM But only @240p? 27-Nov-18 11:54 AM It was recorded from my phone through periscope. Can't do better right now, sorry 27-Nov-18 11:59 AM Ah. I assumed something went wrong on the upload. The resolution is good enough 27-Nov-18 12:00 PM My application for the dead gauges society. http://humancond.org/wiki/user/ram/vacuum/mks_903ap 27-Nov-18 12:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181127_123743475-276E5.jpg 27-Nov-18 12:05 PM sorry, wrong gauge ^^ 27-Nov-18 12:48 PM Good try, but our keen eye says there is not enough yellow in that picture. 27-Nov-18 01:21 PM I have to pump down before I turn it on. How the lights work is one of this bits I figured out. An LM317 current source drives all the LEDs in series. Not all combinations can light, they come on in strict succession. This is one of the few parts of the gauge that actually gets power when you apply power (it has to drive to power light). Everything else would get powered up when you connected the power return (aka hv enable). In my hacked version all three lights come on whenever there is power (because the missing relay board is not shorting the VAC light) 27-Nov-18 01:21 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181127_160853900-68A13.jpg 27-Nov-18 01:30 PM 27-Nov-18 01:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181127_164836277-B0C3B.jpg 27-Nov-18 03:43 PM that's one of those inverted magnetron gauges, right? 27-Nov-18 03:43 PM i considered getting one but i wanted to avoid spurious magnetic fields around any plasmas i'm studying 27-Nov-18 04:16 PM Yes. Screwdrivers stick to the housing. There is a stack of ceramic ring magnets surrounding the sensor chamber. 27-Nov-18 04:22 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181128_0055152-F429E.jpg 27-Nov-18 04:22 PM So I took the compressor apart, but not completely, and haven't found any horrible surprises like water damage or burn marks. The inside of the casting looks nasty though. 27-Nov-18 04:22 PM I guess the missing type sticker was attached to the fiberglass composite plate that made the bottom. It's gone anyway. 27-Nov-18 04:28 PM the crack you mean? 27-Nov-18 04:28 PM or just dirty? 27-Nov-18 04:28 PM The crack in the bottom right, 27-Nov-18 04:28 PM It's pretty clean, especially considering the outside 27-Nov-18 04:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181128_0057582-F36AF.jpg 27-Nov-18 04:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181128_0057082-0F145.jpg 27-Nov-18 04:28 PM The check-valves for intake and out. Rubber material seems in decent condition. Sadly I can't look down the cylinder. And I'm not sure I should take it apart from the other side. Because I'd probably break something. 27-Nov-18 04:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181128_0059232-0C747.jpg 27-Nov-18 04:28 PM screw, if you can't tell 27-Nov-18 04:40 PM those aren't supposed to look like that 27-Nov-18 04:41 PM I have no idea who managed to do this. They do not protrude. Their heads are literally recessed and surrounded by rubber. 28-Nov-18 02:02 AM What do you need for the dead gauges society? Just dead gauges? 28-Nov-18 02:04 AM an instrutech IGM400 gauge 28-Nov-18 02:04 AM thex go for cheap on ebay (like <20 bucks cheap) 28-Nov-18 02:04 AM and have some.... issues 28-Nov-18 02:46 AM yeah they almost certainly need some SMD electrolytic caps replaced but after doing that as long as both filaments aren't blown (this seems rare) then you have, like, a pretty decent ion gauge & controller for basically no money at all 28-Nov-18 02:46 AM they are unfortunately only ever kf16 afaict 28-Nov-18 02:46 AM .. or was it kf25? 28-Nov-18 02:46 AM Not Conflat 28-Nov-18 02:54 AM as far as I know, they are KF16 28-Nov-18 02:58 AM yeah that's right 28-Nov-18 02:58 AM it's extremely my bedtime 28-Nov-18 02:58 AM zz 28-Nov-18 02:58 AM go, go, go! 28-Nov-18 02:58 AM I just woke up. XD 28-Nov-18 02:58 AM crawled from bed to comp. 28-Nov-18 03:00 AM g'night! Nice dreams 28-Nov-18 06:41 AM This should be called, show-but-don't-tell. 28-Nov-18 06:41 AM MPff...as I was writing, my endplate machining sorta worked, but had various misshaps along the way. All my 12mm endmills where dull. My rotary table was loose (!) I hadn't moved it the other day, I don't know how that happened. In any case, I realigned, but measured wrong, and my first 12mm flat was too close to the internal edge, clipping it. 28-Nov-18 06:41 AM I will TIG that, but damn. Anyways, corrected and did the other two connections with not much trouble (apart from the 12mm endmill). 28-Nov-18 06:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20181128_154649-7F591.jpg 28-Nov-18 06:47 AM That looks like an adorable critter 28-Nov-18 06:47 AM XD 28-Nov-18 06:47 AM That looks great 28-Nov-18 06:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181128_153800-A69F7.jpg 28-Nov-18 06:47 AM More crittery. @Leona 28-Nov-18 06:47 AM @AdamMcCombs no, it doesn't. It's slightly marked all the way from not so great workholding, and well, all the aforementioned misshaps. :/ 28-Nov-18 06:47 AM Luckily I ordered more endcaps, so next will be good. 28-Nov-18 06:49 AM Still it looks good 28-Nov-18 06:49 AM (still, will work for my purposes anyways, can't wait to do the custom connectors) 28-Nov-18 06:49 AM can we say acceptable, instead? 28-Nov-18 06:49 AM (connectors are random M8 to SAE customs I made for sale, I don't use them anymore) 28-Nov-18 06:50 AM sure 28-Nov-18 06:50 AM that looks acceptable 28-Nov-18 07:02 AM No, looks great! 28-Nov-18 07:50 AM Plug done! (this looks great ^^) 28-Nov-18 07:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_-fh657c-23D85.jpg 28-Nov-18 07:50 AM With retainer ring so i't doesn't spread while twisting: 28-Nov-18 07:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_-xez4h6-89FDD.jpg 28-Nov-18 07:50 AM In place: 28-Nov-18 07:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181128_164553-B86F3.jpg 28-Nov-18 07:50 AM Custom o-ring groove tool: 28-Nov-18 07:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20181128_165209-D6C80.jpg 28-Nov-18 07:55 AM Oh wow! It's a shame you don't have a knurling tool 28-Nov-18 07:56 AM Yeah, I know, I'm poor (right now) 28-Nov-18 07:56 AM Beauty shot. 28-Nov-18 07:56 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20181128_165738-0C511.jpg 28-Nov-18 08:00 AM do you mean broke? 28-Nov-18 08:00 AM Hm...more like, I have spent all the money I can on this, and can't justify it until I find a job. XD 28-Nov-18 08:01 AM Ah 28-Nov-18 08:02 AM Tomorrow I'll do the extra plugs, weld the hole and a gas port for that. With that my semicon oven should be finished 100% 28-Nov-18 09:04 AM Very nice 28-Nov-18 04:33 PM https://youtu.be/UYZnWp7FSr8 28-Nov-18 07:15 PM https://twitter.com/profanegeometry/status/1067766781098418176 so, unfortunate situation with the RGA, from last night.. 28-Nov-18 07:15 PM it looks cool as heck, but, unfortunately, i think i am gonna need to pop off the whole CF column around the quadrupole to investigate the breadth of the damage 28-Nov-18 07:15 PM also i have watched a total of two (2) mass-spec filament replacement videos so i think i'm now qualified to safely get to the filament and make sure it is in good condition, also 28-Nov-18 07:15 PM (SiS seems to do filament rebuilds for these things for, like, $40, which is not bad at all if that part turns out to be hosed) 28-Nov-18 07:20 PM oof :( 29-Nov-18 02:09 AM Nice work Nixie, your lathe work is really satisfying to look at 29-Nov-18 02:09 AM Oh wow it’s USD$985 29-Nov-18 02:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-31850.jpg 29-Nov-18 02:09 AM Thank you university trash 29-Nov-18 02:09 AM I don’t think there’s anything wrong with it 29-Nov-18 02:09 AM I have no use for a 60GHz waveguide adapter but that’s beside the point 29-Nov-18 02:09 AM *50GHz 29-Nov-18 05:03 AM @a_quiet_scientist thanks, it's mostly due to the inserts I'm using that give out a superb finish. (using "aluminiun" carbide inserts to do stainless) 29-Nov-18 08:09 AM Heh, heh, heh: Vacuum! 29-Nov-18 08:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181129_170540-64CB3.jpg 29-Nov-18 08:09 AM (dimples in the kapton) 29-Nov-18 08:09 AM Lol 29-Nov-18 08:09 AM Taking a leason from NASA I see 29-Nov-18 08:22 AM XDD. The sound of breaking the vacuum with your DiY plug, is very pleasing. (also, that proves the whole shenanigan of endcaps and such, works) 29-Nov-18 08:23 AM if you like that sound you're gonna love MFCs 29-Nov-18 08:23 AM a surprisingly chunky "clunk" followed by the sound of the gas flowing 29-Nov-18 08:25 AM What mfc are you using? 29-Nov-18 08:25 AM even more, what is a MFC? 29-Nov-18 08:25 AM Mass flow controller ^^ 29-Nov-18 08:25 AM ah, well, it will take a long while for me to have one. 29-Nov-18 08:25 AM (not that it worries me) 29-Nov-18 08:26 AM and I have 2 Bürkert 8711 series MFCs, one .2 slpm on my vacuum system, one 25 slpm because it was cheap 29-Nov-18 08:27 AM You can get an old mfc on eBay for $40. The ones I have are 5 and 50 sccm, so no real sound at all. 29-Nov-18 08:28 AM yeah, mine were around that price, too 29-Nov-18 08:28 AM both <1000 sl in total 07-Dec-18 04:41 AM Making a clamp for the roughing section of the turbopump. Original got lost in shipping. 07-Dec-18 04:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Dtz2WV2WsAA6oG4-63E47.png 07-Dec-18 04:41 AM Bandsaw roughing. 07-Dec-18 04:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Dtz6d5zW4AI7uf5-2346A.png 07-Dec-18 04:41 AM After sanding and polishing a bit. 07-Dec-18 04:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Dt0ECpsXcAM8byI-B42D9.png 07-Dec-18 04:47 AM Nice. That seems very neat bandsaw work. That blade is too wide to just cut along the interior curve, right? So you had to nibble it out with lots of little straight cuts? 07-Dec-18 04:52 AM Exactly, if the blade is sharp, it's quite easy. 07-Dec-18 04:52 AM kinda milling freehand. 07-Dec-18 04:54 AM I've been using beat up wood blade, which is very ugly 07-Dec-18 04:54 AM XDDDD 07-Dec-18 04:54 AM If I can recommend a supplier. Tuffsaws. 07-Dec-18 04:54 AM custom blades at good prices. (withing price ranges, that is, from certain sizes to certain sizes, it's the same price for the blade. 07-Dec-18 04:57 AM I exclusively use röntgen blades and weld them myself 07-Dec-18 04:59 AM In case anyone wanted to know 07-Dec-18 04:59 AM still more usefull then the imperial system 07-Dec-18 04:59 AM but something like this should be in #off-topic-thats-sometimes-on-topic 07-Dec-18 05:00 AM True, but well. 07-Dec-18 05:00 AM ah, post it there and delete it here, no worries. 07-Dec-18 05:23 AM ^^^ Moved to #off-topic-thats-sometimes-on-topic 07-Dec-18 05:26 AM @sync please, share how you do that! ^^ 07-Dec-18 05:27 AM I use the blade welder in my bandsaw 07-Dec-18 05:27 AM but you can just braze them or weld them if you anneal them afterwards 07-Dec-18 05:27 AM the saw has one of those things in it: http://decontec-wartung.de/index.php?rex_resize=600a__/0520_bands__ge_05.jpg 07-Dec-18 05:27 AM it's a resistance welder and a grinding wheel, works reasonably ok 07-Dec-18 05:35 AM OHHHH 09-Dec-18 10:38 AM Okay, even I am impressed with myself today. :P "3D printed" aluminium pegs (2 of 4) in the sputtering target gun/endplate 09-Dec-18 10:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Dt-8VgLW0AA-5r1-D6DD5.png 09-Dec-18 10:38 AM Machining test for the standoffs: https://twitter.com/nixie_guy/status/1071765801127043073 09-Dec-18 10:38 AM After machining and slight polishing/cleanup: 09-Dec-18 10:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Dt_tCSSWoAAipjv-9683D.png 09-Dec-18 10:38 AM Scissor cut steel bands (from a stencil) pin themselves into the standoffs with a combination of sharpness and spring pressure: 09-Dec-18 10:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Dt_tDuqX4AAmMXw-3B724.png 09-Dec-18 10:38 AM A less intrusive spring design, also scissor cut (quick test, I'll make them better) 09-Dec-18 10:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Dt_tFEWWoAAIm1u-E1D0B.png 09-Dec-18 10:50 AM Awesome all the way. XDDDD 10-Dec-18 12:34 AM nice 11-Dec-18 07:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181211_100859858_HDR-ED4DD.jpg 11-Dec-18 07:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181207_131527799-26255.jpg 11-Dec-18 07:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181207_131539017-F1D99.jpg 11-Dec-18 07:17 AM what's that? 11-Dec-18 07:21 AM Stainless steel earrings, before and after coating. I used jb weld to attach fixturing loops. They are vacuum coated with something or other, probably mostly TiO2. This is with my titanium hollow cathode setup, using about Ar with about 1% air. Coating did not adhere everywhere. 11-Dec-18 07:21 AM Video shows iridescence better. https://photos.app.goo.gl/HfcbNGus67RUsvxN6 11-Dec-18 07:21 AM The jb weld totally charred, which might have contributed to adhesion problem. But advantage of artisinal craft is that whatever happens, nobody can say it is wrong. 11-Dec-18 07:35 AM Nice!! 11-Dec-18 07:43 AM ah, nice 12-Dec-18 01:12 AM The fixturing loops are stainless too? If so, how about spot welding? 12-Dec-18 04:22 AM Yes, that's a thought. But I'd need to make a welder. Or brazing or maybe some spring clip. I don't want to affect the "good" surface, but I could attach before finishing the polishing. I have messed with trying to spot weld aluminum with just a big capacitor (and no switch), without much success. Recently I learned from glassbender's site that aluminum is one of the more difficult metals. I should give spot welding another try. 12-Dec-18 04:26 AM I think marcoreps did a good video explaining pulse shaping for spotwelders? 12-Dec-18 04:29 AM https://www.youtube.com/watch?v=KU1e-zq9hrw Are you talking about that video? 12-Dec-18 04:32 AM Ah, probably. Less relevant than I thought. 12-Dec-18 04:33 AM Oh, I thought the bateries where capacitors, but no, it's a simpler microwave oven spot welder. 12-Dec-18 04:33 AM btw, powermelting targets! 12-Dec-18 04:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DuN0pPDXQAAH60y-23AF8.png 12-Dec-18 04:33 AM (250W) 12-Dec-18 04:33 AM The setup has been unused for a while, so it was a bit dirty and it took me a while to get a good plasma, but works, nonetheless. 12-Dec-18 04:59 AM Was that with the cooling on? 12-Dec-18 04:59 AM oh, but that is a separate sheet you have spring clipped onto the cold plate, so not very good heat transfer. You could try using Grafoil for thermal coupling, but you would also need a lot of clamping force. 12-Dec-18 05:16 AM The cooling is mainly for the magnets, and also I just wen overboard with the power XDDDD. I just wanted to confirm that the setup holds no matter what. Working power should be around 100W, not 250 XDDDD 12-Dec-18 05:35 AM yeah, with aluminum there is no red glow to let you know it's getting hot in there. 12-Dec-18 05:37 AM Seen the glow in titanium, though. XDDDDDD 12-Dec-18 05:37 AM The plasma is a bit unstable (no regulated power supply, just a 5ohm 100W resistor to limit current) I am waiting for 1ohm and 0,5ohm resistors to see if it improves a bit. (ran previously without resistor, but in the end the 20Kv 2A diodes failed (obviously) with the chamber arcing. So not gonna risk another diode failure. 12-Dec-18 06:07 AM Grafoil (top), pyrolytic graphite (bottom). Both relatively low outgassing high temp materials with good thermal conductivity. Grafoil is from McMaster. Made from compressed natural graphite flake, widely used for high temp gasket material. Pyrolytic graphite from Digikey, used as heat spreader for electronics. Grafoil is compressible, but also somewhat porous, pseudo leak might be a problem in UHV. Both have much higher in-plane thermal conductivity than cross plane, but cross plane is still high, like aluminum for compressed Grafoil. 12-Dec-18 06:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181212_084533480-41FCC.jpg 12-Dec-18 06:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181212_085943517_HDR-ECED3.jpg 12-Dec-18 06:07 AM Next time the diodes blow, I'd suggest a series string of 1kv diodes. Much cheaper than packaged HV diode modules, and gets you better heat dissipation as well. Higher voltage diodes are series strings internally anyway. Especially in the few-kv range, which is all you need for magnetron sputtering. 12-Dec-18 06:07 AM Best for series use if the diodes say they are "avalanche" diodes, or some such. This means nothing bad happens when the diodes reaches its breakdown voltage, it just leaks more so that the voltage drop is shared across the string. 12-Dec-18 06:30 AM In commercial sputter guns it seems they usually use either indium solder or a silver loaded grease for thermal coupling. Of course the products sold for vacuum use are expensive, but indium is itself not too expensive, and apparently easy to use as a solder. Ordinary heatsink thermal grease would probably work also, but the silicone might get in your pump, etc., if you care about that sort of thing. 12-Dec-18 07:59 AM Awesome info! Yeah, the packaged diodes are just convenient for my setup, and pretty cheap. (when I bought them I thought they where russian surplus, but after some months I found they are a conventional format) It's not like someone depends from the machine if it fails. I don't foresee the need for more termal coupling in my "sputter gun" (sort of does everything, it's the end cap for the vacuum chamber, heat disipator and target holder) . So far I have had success with copper and aluminium, wich are pretty difficult to do (as far as I heard) 12-Dec-18 08:01 AM Any particular use for the sputtering? I've just been doing it because I thought it was cool.. 20-Dec-18 05:08 AM @N00N yes 20-Dec-18 05:09 AM and what is the result? 20-Dec-18 05:09 AM https://twitter.com/FauthNiklas/status/967192093318942720 20-Dec-18 05:09 AM this is woithout fiber optic plate 20-Dec-18 05:09 AM -> super noisy image 20-Dec-18 05:09 AM https://twitter.com/FauthNiklas/status/1071170513576316930 20-Dec-18 05:09 AM this is with fiber optic plate 20-Dec-18 05:09 AM -> clean image, but with lower image quality / resolution 20-Dec-18 05:09 AM I guess that's due to the fiber optic plate, which is actually quite old (got it from a sensor assembly from 1980) 20-Dec-18 05:09 AM so probably with a modern, higher resolution FOP this is worth another try 20-Dec-18 05:09 AM https://twitter.com/FauthNiklas/status/1071151153881210880 20-Dec-18 05:15 AM hmm ok 20-Dec-18 05:20 AM ( slight interjection: @robamacl I want the sputtering machine to put aluminium over silicon, I'm trying to make my own semiconductors) 20-Dec-18 05:22 AM hmm, maybe I could get in touch with mike from mikeselectricstuff, he has lots of x-ray equipment, maybe he would sell some of it 20-Dec-18 05:24 AM @niklas you want to identify IC without decapping them, right? 20-Dec-18 05:24 AM yup 20-Dec-18 05:24 AM if i understand correctly 20-Dec-18 05:24 AM ok 20-Dec-18 05:24 AM so your killer gadget would be a xray microscope, right? 20-Dec-18 05:24 AM like https://www.zeiss.com/microscopy/int/products/x-ray-microscopy.html 20-Dec-18 05:24 AM i'm currently searching for papers about SEM based x-ray microscopy and tomography, but i guess, for PCB & IC analysis most SEMs are to "low energy"? 20-Dec-18 05:28 AM https://www.gemeasurement.com/inspection-ndt/radiography-and-computed-tomography/phoenix-nanomex-industrial-x-ray 20-Dec-18 05:28 AM this is the real deal 20-Dec-18 05:28 AM most sealed xray tubes go down to 6µm focal spot 20-Dec-18 05:28 AM to get even smaller, you need optics to focus the lectron beam 20-Dec-18 05:28 AM this is what this device does 20-Dec-18 05:28 AM it's basically a TEM 20-Dec-18 05:28 AM with a tungsten coated beryllium window 20-Dec-18 05:30 AM yeah ok, what i mean, you could build the target in the SEM chamber above the sample/IC and below you would mount the imager 20-Dec-18 05:30 AM and with the scanning optics you're able to move the spot source 20-Dec-18 05:30 AM of course you could also integrate a stage for relative movement between sensor and sample 20-Dec-18 05:30 AM + via the SE detection you're able to locate the spot on the target, to get proper reconstruction/CT math done, but maybe it's BS, i dunno 20-Dec-18 05:45 AM nah, SEM wouldn't work 20-Dec-18 05:45 AM voltage is too low 20-Dec-18 05:45 AM I think it's <20kV for most machines 20-Dec-18 05:47 AM yeah ok what's the threshold? 20-Dec-18 05:49 AM >50kV would be good 20-Dec-18 06:05 AM now i want a micro CT 21-Dec-18 05:07 AM @Nixie AFAIK you should be fine with dc magnetron sputtering for aluminum. 21-Dec-18 05:14 AM Yeah. I have done copper, aluminium and titanium already. 21-Dec-18 11:40 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/download_20181221_223851-D0A4A.jpg 21-Dec-18 11:40 PM Made it in the 11th hour 22-Dec-18 03:45 AM @AdamMcCombs your new SEM? 22-Dec-18 09:06 AM Cleaning wiring! 22-Dec-18 09:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-40F62.png 22-Dec-18 09:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-09EB8.png 22-Dec-18 11:18 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20181222_201814-C12FC.jpg 22-Dec-18 11:18 AM You know... When you spend half a year on a 3D printer and you clog a nozzle with aluminium... I just want to buy some gasoline... 22-Dec-18 11:18 AM I feel like I'd be better off with a 200€ el cheapo at this point 22-Dec-18 11:18 AM Delta is down. This one has not printed anything yet... 22-Dec-18 01:03 PM Looks like a HP printer 22-Dec-18 01:30 PM It is. 22-Dec-18 02:50 PM HP makes FDM? 22-Dec-18 02:56 PM Yeah. But he's having all kinds of weird problems with this one. 22-Dec-18 03:02 PM does the retrofitted heatbed work? 22-Dec-18 03:28 PM He will have to answer that, I don't have news of the bed. 22-Dec-18 09:04 PM It's an HP/Stratasys fdm printer. All new electronics. The heated bed is to not need to use the consumable trays. I can't say it works yet as for some software reason I'm not able to get the height of the first layer correct... 22-Dec-18 09:04 PM The good side is the super build quality and I've only had to spend money on two high voltage DC ssr, connectors and the heated bed! The downside is all the time gon into it 23-Dec-18 02:41 AM Hi 23-Dec-18 02:41 AM Moin 23-Dec-18 02:43 AM Aye, g'day! 23-Dec-18 02:46 AM Moin! 23-Dec-18 03:20 AM Morning! \o/ 03-Jan-19 01:08 AM Yay!! Now I can sense and put argon at the same time. XDDDD 03-Jan-19 01:08 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Dv-XhSHW0AAW8MF-9A8D2.png 03-Jan-19 01:08 AM 03-Jan-19 01:08 AM I mean you could call the current meter on your supply an ion gauge readout... 03-Jan-19 01:11 AM If it worked somewhat reliably, I guess. XDDDD 05-Jan-19 06:52 AM the consumable trays work really well, and you can just use PU building insulation foam as a replacement foam 05-Jan-19 02:14 PM opposite of vacuum, I am working on hacking a very modern (2018) diesel engine to an opensource ECU.. working on the pressure regulation stuff from a flow bench (powered by a hand drill) in my kitchen... 05-Jan-19 02:14 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_5089-BF00A.jpg 05-Jan-19 02:14 PM finally picked the right image, hah 05-Jan-19 03:13 PM Nice! You seem to know your way around fuel injectors. I heard once they could be used to introduce very small and repeatable gas quantities in vacuum systems, what do you think? 05-Jan-19 03:19 PM so, I have yet to get the injectors to fire (working specifically on pressure regulation, first) but equation wise, it's basically a difference of pressures with a small orifice.. each injector is calibrated electronically to inject the same amount at various pressure levels as the other injectors they are with 05-Jan-19 03:19 PM but, without that calibration, yeah, it's fairly simple to figure out the duration per mass, sorta deal 05-Jan-19 03:21 PM But will it seal gas? 05-Jan-19 03:21 PM another method would be to use a long canula, such as the expansion valves w/ refrigerators 05-Jan-19 03:22 PM (havent had the opportunity to see one or dismantle) 05-Jan-19 03:22 PM yeah, it's an airtight seal from what I understand, so long as you have pressure 05-Jan-19 03:22 PM it's a strong spring holding the valve to the seat 05-Jan-19 03:22 PM Ahm. 05-Jan-19 03:22 PM And electrically actuated 05-Jan-19 03:22 PM Should get my hands on one... 05-Jan-19 03:23 PM the driver board is peak-hold, so it will do a first spark of ~60+ volts, then switch over to 12v hold once the injector has opened (which happens faster with more voltage) 05-Jan-19 03:23 PM solenoid type, there is also piezo type 05-Jan-19 03:23 PM Ohhhh 05-Jan-19 03:24 PM they arent cheap, but not exactly scientific grade neither 05-Jan-19 03:24 PM ~$300 USD for an injector seems common 05-Jan-19 03:27 PM Omg...I need fifth hand at least. XD 05-Jan-19 03:32 PM the seal between the cylinder and the injector is a copper washer, so it can easily be design for vacuum... but... would the injector open up under [high] vacuum? they are deisgned more for pressure.. 05-Jan-19 03:32 PM I would think they could handle quite a bit of vac, but to what end? 05-Jan-19 03:39 PM For CVD plasma 05-Jan-19 03:39 PM Trying to get away with no mass flow controllers, if injectors could be found for cheap. 05-Jan-19 03:39 PM I don't think the vacuum counterpressure would be that high that the solenoid can't move it. 05-Jan-19 03:39 PM Given that the area of the valve is pretty small. 05-Jan-19 03:39 PM I would be more comfortable trying to inject O2 or N2 in my chamber to make SiO2 and TiN that way. 05-Jan-19 03:39 PM (than trying to do it with a manual valve, I mean. It just won't be reliable. 05-Jan-19 04:08 PM not that the solenoid cant move it, but that the injector opens up under vacuum is my concern 05-Jan-19 04:08 PM without applying voltage to the solenoid 05-Jan-19 04:08 PM I dont know how strong the spring is in these things 05-Jan-19 04:37 PM it is very strong, it is not going to work at regular gas pressures 05-Jan-19 04:37 PM I also doubt that it is very gas tight 05-Jan-19 05:00 PM oh, I had the whole mechanism backwards in my head, doh! 05-Jan-19 05:00 PM also, what is there to not work against? some of them do require the added pressure to help it lift, others are simply solenoid valves 05-Jan-19 05:08 PM they all are servo driven by the rail pressure 05-Jan-19 05:10 PM so, common gas cylinders are rated at ~2k PSI.. which should be no problem for the injectors.. especially if you look for older injectors where the systems were far lower pressure (half of what is used today) 05-Jan-19 05:10 PM the common rail for idle (800 rpm) of the engine I am working with has a target pressure range of about 3k psi 05-Jan-19 05:10 PM k, afk.. 05-Jan-19 05:18 PM yes, but you don't really want to connect your gas cylinder straight to the injector for various reasons 05-Jan-19 06:12 PM well, a regulator but still capable of deliverying 1k PSI should prob be plenty.. you just need to use steel tubes rated for the pressure, not hoses 05-Jan-19 06:12 PM without actually doing maths and looking up what is required, etc 05-Jan-19 06:14 PM You won't need nearly as much pressure for gas, it's much less viscous. Also, the whole idea for vacuum is delivering a really small amount. 05-Jan-19 06:15 PM I figured the idea for a vacuum is to eliminate contams 05-Jan-19 06:17 PM I mean, the reason to use a mass flow controller, or something else, like an injector. You want to dose the vacuum with a really small amount of some desired gas, the "process gas". 06-Jan-19 12:28 AM Yup 08-Jan-19 08:10 PM rebushing the barrel bridge 08-Jan-19 08:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190108_125017-68C66.jpg 08-Jan-19 08:10 PM crappy shot, but yeah 10-Jan-19 05:53 AM J99 spark plug as a feedthrough just came :) 10-Jan-19 05:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190110_145250-8B086.jpg 10-Jan-19 05:54 AM yeah! 10-Jan-19 05:54 AM time to give 2 of them to @Pan Da 10-Jan-19 05:55 AM I changed my mind, I think I'll keep all 4 :D 10-Jan-19 05:55 AM jk 10-Jan-19 09:11 AM 10-Jan-19 09:11 AM How come those exist? 10-Jan-19 09:11 AM What is the thread? 10-Jan-19 09:12 AM regular spark plug thread 10-Jan-19 09:12 AM m14x1.5 I think? 10-Jan-19 02:25 PM they're made for us vacuumers 10-Jan-19 02:25 PM for us suckers 10-Jan-19 02:26 PM XDDD 10-Jan-19 02:26 PM Literally as feedthroughs? how do they handle the virtual leaks with the threads? 10-Jan-19 02:26 PM Are they pricey? 10-Jan-19 02:26 PM I kinda want one to play. 10-Jan-19 02:28 PM they're fine, virtual leaks aren't as much of a problem if you cut along the threads once or twice 10-Jan-19 02:28 PM and sealing? 10-Jan-19 02:28 PM piece of indium 10-Jan-19 02:28 PM just glueing them in place I would say, with epoxy? 10-Jan-19 02:28 PM yeah, or uhu endsieg 10-Jan-19 02:29 PM is indium really viable to stop virtual leaks from threads? 10-Jan-19 02:29 PM can the outside metal part be machined to make it smaller? 10-Jan-19 02:29 PM (or does anyone have a cross section drawing?) 10-Jan-19 02:29 PM don't know 10-Jan-19 02:29 PM not me 10-Jan-19 02:30 PM you mean nearly to the size of the ceramic? 10-Jan-19 02:31 PM not that much, but generally smaller 10-Jan-19 02:31 PM give it a try 10-Jan-19 02:31 PM Depending on price. 10-Jan-19 02:31 PM 9€ a piece, if you buy a 4 pack 10-Jan-19 02:32 PM too expensive for me right now, but I'll keep it in mind. 10-Jan-19 02:32 PM (not expensive, itself, I just have to be careful on what I spend money on) 10-Jan-19 02:32 PM and that is not needed right now, just curiosity 10-Jan-19 02:33 PM but I think you could also use nearly any other sparkplug without a resistor, and somehow make the electrode longer (solder etc.) 10-Jan-19 02:33 PM and that would make it much cheaper, just buy bunch of old stock 10-Jan-19 02:34 PM but a normal sparkplug doesn't have an extended ceramic to isolate it from the body. 10-Jan-19 02:34 PM would support much less KV 10-Jan-19 02:34 PM And I am not sure how you could weld into the socket. 10-Jan-19 02:35 PM not really, the ones I see online seem to have an even bigger ceramic 10-Jan-19 02:35 PM the air side is just like a regular spark plug, the "HV" side is almost like a normal one, just ~5mm more ceramic 10-Jan-19 02:35 PM ??? 10-Jan-19 02:35 PM What kind of sparkplugs are we talking about? 10-Jan-19 02:35 PM I think about normal car sparkplugs 10-Jan-19 02:36 PM but the ceramic isn't what insulates your voltage, it's the vacuum 10-Jan-19 02:36 PM unless you are not working at high vacuum. 10-Jan-19 02:36 PM in which case it would be hard to get a lot of voltage anywhere 10-Jan-19 02:37 PM yeah, normal spark plug 10-Jan-19 02:37 PM But higher than if the electrode is just sitting without ceramic. 10-Jan-19 02:37 PM ok yeah, I was not talking about the HV side, sorry 10-Jan-19 02:37 PM HAHAHAHHA, okay, okay 10-Jan-19 02:37 PM You got me confused tere. 11-Jan-19 02:35 PM got to use a "new" watch tool today, a vibrograph.. 11-Jan-19 02:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190111_111732-7C787.jpg 11-Jan-19 02:35 PM basically you reference your new balance+hairspring that you just formed against a standard, and attempt to match up where the regulating arms would go, or if you need to cut off more outside coils 11-Jan-19 02:35 PM they dont make this tool anymore 11-Jan-19 02:54 PM Nice! I have some tools for old pocket watches. I collect them on the side kinda. I have a few, one thing I need to put back together and oil is an old bank vault timer I have in pieces currently. 11-Jan-19 02:57 PM there is a great book if you are into time locks.. American Genius 11-Jan-19 02:57 PM https://www.amazon.com/American-Genius-Nineteenth-Century-Locks/dp/1593720165/ 11-Jan-19 02:57 PM tons of pics 11-Jan-19 02:58 PM Cool! 11-Jan-19 03:24 PM Why don't they make it anymore? 11-Jan-19 03:45 PM because watchmaking is dying out? 11-Jan-19 03:45 PM ~32 graduates across the few schools in the US every year 11-Jan-19 03:45 PM plus modern companie sjust sell a complete balance for not all too much, actually 11-Jan-19 03:45 PM so long as it is still in production 11-Jan-19 03:45 PM they calibrate it against imaging and computer stuffs 11-Jan-19 04:16 PM Oh... 11-Jan-19 04:16 PM I guess there will be always a few watchmakers, but yes, it's a dying art (as many others) 11-Jan-19 04:16 PM Wich makes me remember. Does anyone of the watchmakers here have any schematics of the mechanical activators for nuclear heads (or something nuclear) that where like small watches and requied a specific set of impulses otherwise they deactivated the keys for the bomb? 11-Jan-19 04:16 PM (not sure if I am explaining correctly) 12-Jan-19 09:46 AM sick 14-Jan-19 04:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190114_192511-03ED7.jpg 14-Jan-19 04:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190114_192750-68F73.jpg 14-Jan-19 04:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190114_192641-0D6A9.jpg 14-Jan-19 04:02 PM /r/rateMyVacuumChamber 14-Jan-19 04:02 PM This is from an old vidicon surveillance camera 14-Jan-19 04:02 PM 3mm think safety glasses, o-ring sealed to that aluminum part 14-Jan-19 04:18 PM Looks plausible. You need to attach a KF port or something so you can pump it down and check vacuum. Do you have any particular ambitions? That would affect how you accessorize. 14-Jan-19 04:24 PM Nope, I don't have a use for it yet... But yeah I will probably mill a base plate for it with a KF40 flange 14-Jan-19 06:57 PM Woah that thing is huge 15-Jan-19 04:03 AM there was a version of that camera with even more optics, a motorized focus and zoom function and a heated front glass... got one of them somewhere in storage. beautiful things... and they were mounted on massive tilting jigs. 15-Jan-19 04:24 AM yeah this thing is heavy 15-Jan-19 04:24 AM I mainly bought it so I don't come up with the circuitry to drive a vidicon myself 19-Jan-19 12:14 AM Working on manual, stackable, SMD tape feeders! 19-Jan-19 12:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190119_085058-ADA87.jpg 19-Jan-19 12:14 AM (that thing is tiny! 30mm height, 10mm wide, 45mm long. Output is at an angle for easy picking. Might release also a version with top picking and solenoid actuation, for the lulz) Makes heavy use of ball bearings, so, not just 3D printable and go. But who cares? 19-Jan-19 01:38 AM Nice! 19-Jan-19 01:38 AM at first glance I thought you're redesigning the cetus MK1 extruder 19-Jan-19 03:32 AM Cool! 19-Jan-19 04:37 AM the extruder works fine. The pin spacing in the pulley is wrong, I have to correct that. Also, it could use slightly more throat space for bigger 8mm tape components. Not sure if I should also make a 12mm version. (Like...are there components small enough in such tape as to be worth a dispenser... ) 19-Jan-19 04:51 AM uh, oh, I'm interested 19-Jan-19 04:51 AM I've built a 3D printed one, but i'm not satisfied with it 19-Jan-19 04:51 AM need it for my Tape-Printer 19-Jan-19 08:19 AM Tape printer? 19-Jan-19 08:27 AM I've made a tape printer for components some time ago 19-Jan-19 08:27 AM https://twitter.com/JanHenrikH/status/972546486155300864 @Nixie 19-Jan-19 08:27 AM https://twitter.com/JanHenrikH/status/972547742689001472 19-Jan-19 08:50 AM Nice! But I fail to see how my manual feeder design can help you. 19-Jan-19 09:44 AM I can add a motor to it and remove the cover remover 19-Jan-19 09:44 AM It will be much sturdier 19-Jan-19 12:53 PM Hum...you'll have to do some heavy modifying of the model, i think 19-Jan-19 12:53 PM Wouldn't it be cheaper to just print two rubber rollers and a guide? 20-Jan-19 08:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190120_104812812-B62B0.jpg 20-Jan-19 08:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190120_103539895_HDR-B99EF.jpg 20-Jan-19 08:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190120_101528509-CFE11.jpg 20-Jan-19 08:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190120_104956919_HDR-22ED6.jpg 20-Jan-19 08:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190120_105904958_HDR-80EB0.jpg 20-Jan-19 08:46 AM There's a bug in my chamber. 20-Jan-19 08:51 AM sweet 20-Jan-19 08:51 AM Middle sputter cleaning, top, coating. Coating went much faster than I was expecting and also covered only parts more than couple mm from edge. I'm going to try again, getting rid of the holder plate. Due to plus substrate bias the holder may be sucking up the coating?? IDK. Usually you use negative bias for sputtering, but I seem be getting much faster coating with plus bias. 20-Jan-19 08:53 AM do you have a better foto of your sputter gun? 20-Jan-19 08:55 AM Look up above on nov 24 20-Jan-19 09:21 AM Lovely! 28-Jan-19 03:49 PM https://www.youtube.com/watch?v=rx_5ZGM5il4 I learned this weekend that GM tubes can make sounds! 28-Jan-19 03:50 PM I love that sound 28-Jan-19 03:50 PM bzt bzt bzt bzt bzt 28-Jan-19 03:51 PM yes ❤ 28-Jan-19 10:54 PM Can I get an explanation about what I'm hearing? 28-Jan-19 11:04 PM Also, morning! \o/ 29-Jan-19 01:37 AM Moin! 29-Jan-19 01:37 AM The sounds are of a Geiger tube triggering, every discharge causes a small tick 29-Jan-19 01:53 AM Ah, nice! 29-Jan-19 02:01 AM Ah! I thought it was something else. 29-Jan-19 02:02 AM no, you can hear the actual discharges through the tube 29-Jan-19 02:02 AM which I think is pretty cool 29-Jan-19 08:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190129_163041-B8159.jpg 29-Jan-19 08:58 AM Quick flexy show. ^^ 30-Jan-19 07:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190130_170153-6C06D.jpg 01-Feb-19 11:58 AM STM ? 01-Feb-19 12:26 PM Yup 01-Feb-19 04:07 PM what sort of piezos are you using? 01-Feb-19 05:48 PM oh, that reminds me of some stuff I did a while back 01-Feb-19 05:48 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-10D8D.png 01-Feb-19 05:48 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-44C29.png 01-Feb-19 05:48 PM holes! 01-Feb-19 10:17 PM if you need them they are there for you plenty of them - holes 02-Feb-19 02:09 AM they are bad tho 02-Feb-19 06:38 AM @sync what were you making that shouldn't have holes? 02-Feb-19 10:03 AM some material engineering on Si 04-Feb-19 11:19 AM sooo. how do i upload pictures... 04-Feb-19 11:20 AM With mouse clicks 04-Feb-19 11:20 AM There is a "+" symbol in the writing part, that opens options. 04-Feb-19 11:20 AM ahhh, found it! thanks 04-Feb-19 11:20 AM outside of the first feedthrough 04-Feb-19 11:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190204_195304-19AA2.jpg 04-Feb-19 11:20 AM vacuum side 04-Feb-19 11:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190204_195319-6FA30.jpg 04-Feb-19 11:20 AM outside of second feedthrough 04-Feb-19 11:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190204_195639-46519.jpg 04-Feb-19 11:20 AM vacuum side - it's shielded and it uses custom screw clamps for the electrodes 04-Feb-19 11:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190204_195707-173B8.jpg 04-Feb-19 11:20 AM (nixie wanted pictures, i managed to find my camera) 04-Feb-19 11:20 AM got some more pictures of other gauges with single high voltage feedthroughs, but they are too well shielded - you basically see nothing of the feedthrough except for small pieces of ceramic 04-Feb-19 11:20 AM ...the first two pictures were a convectron gauge, the standard one: 04-Feb-19 11:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190204_195158-43BE6.jpg 04-Feb-19 11:20 AM the other two were a balzers IMR310 04-Feb-19 11:34 AM Nice! 04-Feb-19 11:34 AM How does the first model perform the sealing action to whatever else? an o-ring? 04-Feb-19 11:36 AM it's welded like this: 04-Feb-19 11:36 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190204_195229-AEEB8.jpg 04-Feb-19 11:46 AM i just filed away the weld seam to open it up 04-Feb-19 12:11 PM oh thats an interesting idea, re-use old gauges for passthroughs I guess... 04-Feb-19 12:21 PM yup 04-Feb-19 12:21 PM i have enough dead gauges of all kinds and shapes... sadly those convectrons are unusable as feedthroughs because of their geometry 04-Feb-19 12:21 PM and they have a tiny screen mesh between the stem and the measuring chamber 04-Feb-19 12:21 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190204_195249-4EC1F.jpg 04-Feb-19 12:42 PM well you can cut out the mesh and feed wire through... 04-Feb-19 12:42 PM but generally I don't think you use insulated wire in a chamber because of outgassing? 04-Feb-19 12:42 PM so keeping them seperated would be a fun challenge in of itself 04-Feb-19 12:43 PM what he means is that you'd have to cut open some sort of HV seal to get access to the feeds 04-Feb-19 12:43 PM right, theres that issue too 04-Feb-19 12:43 PM though adam was talking about epoxying to seal things back up 04-Feb-19 12:44 PM but if you're willing to use epoxy you can just drill and glue something into a blind flange 04-Feb-19 12:47 PM yup 04-Feb-19 01:24 PM or you weld the stainless shut again 04-Feb-19 10:21 PM You could use PTFE (teflon) tubes to separate the tubes. It is vacuum compatible. 06-Feb-19 02:00 AM Yay! My CNC to analog converter works! (someone I sent boards to test had problems, but I think they left some pin unconnected or something, mine just worked flawless) 06-Feb-19 02:00 AM https://twitter.com/nixie_guy/status/1093083804623867905 07-Feb-19 05:31 AM can you maybe give short description what it does? what for an analog value is it outputting? 07-Feb-19 06:33 AM It's controlled through a CNC parallel port with step/direction pins, and outputs a 5V analog signal (12 bits). I will use it to control the spot in a CRT-like assembly (using all the CRT electronics) to try to e-beam etch resist for the chips project. 08-Feb-19 11:26 PM So I'm pretty busy with renovations in the house right now, but a few weeks ago I got my very first vacuum pump! Shipping seems to have been a bit rough and at one end a bit of a cooling fin broke off... Well it was very cheap, so if it works it would still be amazing. 08-Feb-19 11:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190209_081633-0F718.jpeg 08-Feb-19 11:26 PM But I'm not really sure what to do now Do I just plug it in to see if it runs or change the oil right away or disassemble it to see if anything is broken? 08-Feb-19 11:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190209_081641-5AC79.jpeg 08-Feb-19 11:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190209_081653-03DEA.jpeg 08-Feb-19 11:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190209_081741-2C1CB.jpeg 08-Feb-19 11:35 PM Also got some vacuum gauge weirdness I connected everything and turned it on. But I don't have a vacuum to measure, so no idea if it works correctly. 08-Feb-19 11:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190209_082944-DE6D3.jpeg 08-Feb-19 11:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190209_083013-55340.jpeg 08-Feb-19 11:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190209_083018-17307.jpeg 09-Feb-19 02:21 AM If it came with the holes unplugged, I would strongly advise a full rebuild. If it was very cheap, I also recommend it. 09-Feb-19 02:21 AM In fact, just rebuild it. 09-Feb-19 02:21 AM XDDDD 09-Feb-19 02:21 AM Congrats on the purchase, shame on the broken fins. :/ 09-Feb-19 05:48 AM I have a very similar pump, US licensed version of Alcatel. You should not have much trouble finding the manual online. IMO if you turn on the pump and it spins then there is no harm in flushing it, adding oil and seeing how well it pumps. That's what I did with mine, and I got lucky. @heye functionally the broken fins do not matter at all. Do not run for any length of time before adding oil or flushing fluid, just check if it spins or if the pump is locked up. Whether to go direct to rebuild or try flushing would depend on your confidence with mechanical work. 09-Feb-19 06:22 AM FWIW, rebuilding is done all the time in industrial practice. The manual says that if the pump has not been used in 6 months then you should rebuild. There are two levels of rebuild, one replaces mainly the seals, the full rebuild also replaces the vanes and some other parts. IIRC the full rebuild kit is ~ $250 Flushing fluid is a cheaper grade of oil which still has a reasonably low vapor pressure so that the residue does not undermine pumping performance. Run several changes with a thorough drain in between. A fairly aggressive procedure is described in the manual: leave the drain plug out and dribble oil into the vacuum inlet. Once you have the hideous tarry gunge and rust out, let it run for an hour or two with the flushing fluid (intake stopped off). It is normal for smoke-like oil mist to come out the exhaust, especially when pumping at atmospheric pressure. 09-Feb-19 06:37 AM You have a Varian thermocouple gauge hooked to some other plumbing. If it is working this will read from 2 Torr down to around 0.01 Torr (10 millitorr or "microns"). Your readout electronics seem to also support hot cathode ion gauge (and likely others). You will want a gross vacuum gauge of some sort (like even an analog dial), since the TC gauge doesn't start to do anything until you get to medium vacuum. 09-Feb-19 06:54 AM The main weakness of the thermocouple gauge (especially in your situation of not having a working vacuum system) is that it needs a zero calibration at high vacuum. But if you got the gauge tube with the readout then it may be more or less calibrated. 09-Feb-19 08:14 AM @heye if you need oil, i have some Shell S2R 100 left... and am visiting hamburg in march, if i remember correctly you are somewhere near there? 09-Feb-19 08:14 AM and if you need help or advice or just bad jokes and useless comments for disassembly, sach bescheid. 09-Feb-19 09:50 AM Good info @robamacl ! I have an Akcatel 2008? pump in the basement so I'll definitely be following these steps for that guy. Thank you :) Not sure what I'll be using that roughing pump for yet since I have an RV12 now but I'm sure I'll be using it someday. 09-Feb-19 11:43 PM Thank you for the info @robamacl that will be really usefull! It spins just fine, so I will see how well it works, then try the cleaning fluid/cleaning procedure that you described! 09-Feb-19 11:43 PM I don't really want to rebuild the pump if I don't have to, because I don't have much time right now. And I would need a kit ^^ 09-Feb-19 11:43 PM Does anyone know where to get cleaning fluid in germany? Or the german name so I can search ebay? xD 09-Feb-19 11:43 PM Oh and @Pan Da that sounds amazing! I do live near hamburg and like bad jokes ^^ 09-Feb-19 11:58 PM Shiny new (not really new) flow controller. 09-Feb-19 11:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190209_084535-E9B44.jpeg 09-Feb-19 11:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190209_084615-D4717.jpeg 09-Feb-19 11:59 PM fancy 10-Feb-19 12:51 AM Those wonderful shiny burkert controllers 10-Feb-19 09:58 AM Yea I wish those were common in the states... So shiny ;; 11-Feb-19 02:54 PM Anyone have any expericense with the chinese sub-50eur vacuum pumps? 11-Feb-19 02:54 PM I see them on aliexpress and I'm tempted by the cheapness 11-Feb-19 02:54 PM Under 50eur shipped to me from germany 11-Feb-19 02:54 PM Apparently sold for airconditioner/heatpump servicing 11-Feb-19 02:55 PM extremly loud 11-Feb-19 02:55 PM don't reach their nominal pressure 11-Feb-19 02:55 PM Like this one https://www.aliexpress.com/item/Ship-From-DE-2-5CFM-1-4HP-Powerful-Single-Stage-Vacuum-Pump-Suitable-For-Refrigeration/32911786725.html 11-Feb-19 02:55 PM Ok 11-Feb-19 02:55 PM Loud is bad 11-Feb-19 02:56 PM no location pins on the different plates of the stator, meaning that if you take them apart you have to fiddle around with it until it reaches lowest possible vacuum 11-Feb-19 02:56 PM never got mine below 0.1 mbar, even with good oil 11-Feb-19 02:56 PM but yeah, major downside is noise 11-Feb-19 02:56 PM https://www.youtube.com/watch?v=24rGEr8fgxw 11-Feb-19 02:56 PM that's one of those 11-Feb-19 02:59 PM That's really annoying 11-Feb-19 02:59 PM yep 14-Feb-19 11:43 PM Oh, I have the dual stage version that and I've used it for all of my vacuum work with varying success.. harbor freight tools resells almost that exact same model 14-Feb-19 11:43 PM it's extremely loud and i think i overheated one and got it to roast its oil into a disgusting and catastrophic mess. i tried rebuilding it afterwards and completely messed it up 14-Feb-19 11:43 PM i basically can't keep it running in my bedroom because of how loud it is, so i tuck it outside on some foam and it mostly helps.. but then i can't run it when it rains 14-Feb-19 11:43 PM the dual stage version, otoh, definitely does manage 10-² torr, as rated, and they're cheap enough ($150) that i don't worry toooo much about ruining one somehow 14-Feb-19 11:43 PM they don't have a suckback arrestor though so if you turn it off with anything other than a length of hose still attached, it'll snort oil up into your everything. i definitely had a cat-induced foreline cleaning adventure at one point because of this 14-Feb-19 11:43 PM if you're careful and keep a good zeolite trap in front of it and don't mind awful ear-ringing noise, it will back a small turbo adequately 16-Feb-19 01:41 PM high pressure pump driving motor is now a router 16-Feb-19 01:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0090-1E52B.jpg 16-Feb-19 01:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0091-E1C0F.jpg 16-Feb-19 01:41 PM I still need to make a proper coupling, or buy a new collet.. but I can make the coupling at school 16-Feb-19 01:41 PM if security is around campus tomorrow (might not be on monday as it is a holiday) then I can be let into the lab to make it.. pretty simple 1/4" round shank to 1/4" square (or 3/8", or 1/2".. but I have couplings for those, and the swivel joint helps misallignment so I want to keep them) 17-Feb-19 12:15 AM XD 17-Feb-19 03:12 AM why don't you machine a pulley for the taper? it's 1:10, like all diesel stuff is 17-Feb-19 01:43 PM a pulley? I am driving the nut that hold the sprocket on (which is still on the timing chain/inside the engine) 17-Feb-19 02:09 PM also, I have a swivel socket in there, which allows some misallignment (I am using 2x4 lumber as the frame which is less than preciscion).. it almost came down to what I have on hand.. and the fact that it had a nut made driving it very easy 17-Feb-19 02:12 PM yeah, but you can drive it with something else too if you have a pulley 17-Feb-19 02:12 PM and you can put a larger async or capacitor motor on 17-Feb-19 02:13 PM sure.. I only needed to machine this one adapter (1/4" shank to 1/2" square drive) thus far.. before I rigged other adapters and whatnot to work 17-Feb-19 02:13 PM and this motor seems to be running atleast at a baseline.. but now I need a bigger PSU to make it go faster 17-Feb-19 02:13 PM again - it came down to what I had on hand 17-Feb-19 02:13 PM a triac could be a simple alternative over a big(bigger) power supply 17-Feb-19 02:13 PM and for the current testing, no need for precision speed control 17-Feb-19 02:13 PM rough estimation works well enough, and the method of knowing the RPM is from a magnet on a ive + hall effect sensor, and the o-scope 22-Feb-19 02:36 PM https://twitter.com/GigaBecquerel/status/1099075199499145216 22-Feb-19 02:40 PM oh jeez 22-Feb-19 02:41 PM oh yeah 22-Feb-19 02:41 PM at the time I didn't even realize how much the countrate went up just buy bringing the shielded source close 23-Feb-19 08:57 PM Shameless self promotion, might not be imaging targets in a vacuum but it still has vacuums in tubes https://id10t-tech.com/ 23-Feb-19 11:23 PM Bahaha, this group is not literally only about vacuum, don't worry! Is that your blog? X-rays are always nice. Is that a single time thing or you x-ray things on a usual basis? 23-Feb-19 11:24 PM Yeah, little wordpress site I'm assembling, I bring it out from time to time when I have something worth xraying 23-Feb-19 11:24 PM for now I've burned through most of the "LOL I got an xray unit lets xray all the things" 23-Feb-19 11:24 PM points finger at @AdamMcCombs , don't look that way at me, we talk about everything in here, right? 23-Feb-19 11:24 PM Totally know the feeling. I got to use one at my old job and made a youtube channel, but left the job so I can no longer do it. (Altough I could go and ask for permission to use the machine and they would probably say yes). I'm sure a few people in here are going to be excited about your machine (more than me, I mean). 23-Feb-19 11:24 PM Can we know more about the machine? 23-Feb-19 11:24 PM (if you in the mood of writing/showing photos, of course) 23-Feb-19 11:28 PM It's just a Siemens Heliodent MD dental xray unit and I'm using a Nikon D7000 and a standard 400 speed film cassette 23-Feb-19 11:28 PM I literally just set it up along the bathroom counter lol 23-Feb-19 11:30 PM Good enough! 23-Feb-19 11:30 PM We talk about all the cool tangents here 23-Feb-19 11:32 PM I eventually want a digital sensor but $$$$ 23-Feb-19 11:32 PM But if you look at the posts in the earlier ones you can see the progression of the image quality 23-Feb-19 11:32 PM It's pretty good now, but I'm limited in focus and quite possibly grain size 23-Feb-19 11:36 PM Will check later today in the voice chat, with the computer (my phone displays the page weirdly). 25-Feb-19 11:05 AM This is as good as I can get with my SEM right now... 25-Feb-19 11:05 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190225.000014-F47C2.jpg 25-Feb-19 11:28 AM Lovely! 25-Feb-19 11:28 AM What is it? 25-Feb-19 11:29 AM should be a piece of coathanger bent back and forth until breakage :P 25-Feb-19 11:29 AM I was testing last night with copper wire, same concept, it makes a really good rough surface for calibration/alignment 25-Feb-19 11:29 AM Adam was talking to me and piGuy about alignment last night 25-Feb-19 11:29 AM unfortunately my machine is more like TEM alignment, and thus is like... way more complex haha 25-Feb-19 11:29 AM I have to read up on some electron optics stuff Adam sent me 25-Feb-19 11:39 AM Nice! 25-Feb-19 11:39 AM is it NDA protected? 25-Feb-19 11:39 AM (the electron optics stuff) 25-Feb-19 02:13 PM not what he sent me, the docs he sent me are procedures for understanding TEM optics 25-Feb-19 02:13 PM since my machine is very much like a TEM in its optics systems 25-Feb-19 02:13 PM http://www.rodenburg.org/guide/ 25-Feb-19 04:27 PM Variac 25-Feb-19 04:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0127-BE722.jpg 25-Feb-19 05:51 PM it has no issue on kicking hte motor to get it going.. just wish I had a better tachometer than a hall effect sensor and the o-scope 25-Feb-19 05:51 PM something with a large LCD 25-Feb-19 05:51 PM large numbers 25-Feb-19 11:15 PM Sidetrack and build a tachometer! 25-Feb-19 11:15 PM https://twitter.com/TheAmpHour/status/1100138574534639616 26-Feb-19 04:58 PM so, apparently we have a mass qty of watch hands w/ radium.. 26-Feb-19 04:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0128-63E9E.jpg 26-Feb-19 04:58 PM that's only one box.. we have dozens 26-Feb-19 05:03 PM ties down @GigaSquirrel Watch out! Or it will steal them and bury them in lead forest ground to go feed at later dates!! 26-Feb-19 05:03 PM I am trying to think of actual use for them 26-Feb-19 05:04 PM @GigaSquirrel becomes more powerful with that siren voice DAMMITTT! 26-Feb-19 05:10 PM "A typical self-luminous watch that uses radium paint contains around 1 microgram of radium" 26-Feb-19 05:20 PM I'd be interested in some if you're wanting to part with them 26-Feb-19 05:20 PM not mine to give out.. I may have access to them, but I am pretty sure I wont ship any 26-Feb-19 05:20 PM so give me ideas!, beyond alpha particles 26-Feb-19 05:21 PM I've been trying to track some down within my budgeet to bring back to life, From what I've seen there's potential to make them shine again 26-Feb-19 05:21 PM I want to see about incorporating live radium paint into some of my projects (on gauges and whatnot) 26-Feb-19 05:21 PM yeah, you basically put more Zinc Sulfide back on there 26-Feb-19 05:21 PM essentially yeah 26-Feb-19 05:21 PM the radium will outlive everything 26-Feb-19 05:22 PM but the key is getting it off the watch hand so you can reuse it 26-Feb-19 05:22 PM without making it airborne and killing yourself 26-Feb-19 05:22 PM some solution, I'm pretty big into chemistry so could figure it out.. just havent really considered any real use for it 26-Feb-19 05:23 PM from what I've seen it's very likely it's wax based, you could just heat it up and try to scrape it off 26-Feb-19 05:23 PM occasionally the actual old paint tins end up on ebay, the instructions say heat up a metal wire, scoop some up, put on watch hand 26-Feb-19 05:24 PM converintg it to a usable salt my be easy enough, too 26-Feb-19 05:24 PM and then the NRC starts knocking down your door 26-Feb-19 05:24 PM then if not useful there, converting it back to metallic may make sense 26-Feb-19 10:52 PM ‪what do you think of this? Some sort of X-ray photoelectron spectroscopy system I’m guessing. Pretty old but might be worth salvaging anything? HV supply might be worth keeping?‬ 26-Feb-19 10:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-AA841.jpg 26-Feb-19 10:53 PM Oh gawd 26-Feb-19 10:53 PM Why not all? 26-Feb-19 10:53 PM XD 26-Feb-19 10:53 PM My boss is like “I’m keeping all the conflat parts but you can have the weird o ring stuff” 26-Feb-19 10:53 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-8F772.jpg 26-Feb-19 10:53 PM Still it’s a free 4” 26-Feb-19 10:54 PM Nice! 26-Feb-19 10:57 PM That rack of old EM stuff could maybe make a DIY EBL controller 26-Feb-19 10:57 PM You can get good enough fusor vacuum with Viton o rings right? 26-Feb-19 11:39 PM No idea. 26-Feb-19 11:39 PM Yeah 26-Feb-19 11:39 PM If you are running for a really long time you may have problems, but viton can take a lot of heat 26-Feb-19 11:39 PM Really you can get away with a lot in a fusor 26-Feb-19 11:51 PM (up to 200ºC, I read somewhere) 27-Feb-19 01:39 AM @a_quiet_scientist looks like an auger electron spectrometer 27-Feb-19 01:39 AM @Nixie I've got enough hands (pun intended), but I want a vial of the paint, that stuff can get really hot 27-Feb-19 01:50 AM Yeah auger is a good guess 27-Feb-19 01:50 AM tof sim maybe but probably not 27-Feb-19 01:50 AM Literally all of that is really good kit to have for electron microscope and e beam lith stuff. 27-Feb-19 01:56 AM well the second thing from the bottom up says "auger system control"... ^^ 27-Feb-19 01:57 AM You know thats a really good point 27-Feb-19 01:57 AM Still I would love to have all of that kit 27-Feb-19 01:58 AM That lock in amp as well 27-Feb-19 01:58 AM Literally just everything about it 27-Feb-19 02:00 AM maybe they're willing to ship some parts to you 27-Feb-19 02:04 AM really got ? 27-Feb-19 06:43 AM I’m guessing today you could get the same lock in amp in something smaller than your hand 27-Feb-19 06:10 PM we serviced our first Rolex today, a 1601 27-Feb-19 06:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0130-C1DB1.jpg 27-Feb-19 10:31 PM "unadjusted"? 28-Feb-19 02:17 AM @Noxz what does "serviced" mean in this context? 28-Feb-19 02:17 AM is the pic taken through such a https://www.goldschmiedebedarf.de/images/products/8270LED_5648.jpg ? 28-Feb-19 07:01 AM yeah, it was a 6x power loupe 28-Feb-19 07:01 AM service means: dissasemble (while checking various conditions), clean, reassemble, lubricate, time 28-Feb-19 07:01 AM unadjusted means they didnt regulate the watch for specific positions, simply regulated and such 28-Feb-19 07:01 AM it's a swiss law and something about export taxes being lower if so 28-Feb-19 07:09 AM Oh! 28-Feb-19 08:01 AM @Noxz you're a watchmaker? 28-Feb-19 08:41 AM Yeah, he's been telling us a long while now. It's a fantastic skill/profession/knowledge 28-Feb-19 11:59 AM watchmaking student, first year out of the two 28-Feb-19 01:26 PM details 28-Feb-19 03:16 PM We have a micromechanic intern at work, more or less an industrial watchmaker. 28-Feb-19 03:16 PM Literally studies at a watch making school, but degree program is micromechanics instead of just watchmaking. 28-Feb-19 03:16 PM I have been told that at least on european scale it's a pretty rare program. 28-Feb-19 04:52 PM only like 5 schools in the US teach watchmaking anymore, two different cirriculums, I'm in the SAWTA program which is subsdidized by Rolex 28-Feb-19 04:52 PM just tried out the new lathe.. soo tiny yet powerful enough to turn steel chips blue 28-Feb-19 04:52 PM amazing 28-Feb-19 04:52 PM I may want to locate some new O-Ring style belts for it though, as it doesnt need the classical watchmaking style 28-Feb-19 10:30 PM 01-Mar-19 06:41 PM also, since no new topic came up here, something to note about that Rolex pic.. beyond there being no balance, the escape wheel has a shock setting.. kind of unique to a decent degree 01-Mar-19 08:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1654-2DA45.jpg 01-Mar-19 08:04 PM Flushing the RV12 01-Mar-19 08:04 PM Because the lil hitachi started leaking... 01-Mar-19 08:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1652-0FEA5.jpg 01-Mar-19 08:04 PM Also don't mind all that gaff tape... 01-Mar-19 09:49 PM Nice big slug of money ready to go in the electron beam 01-Mar-19 09:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-1C31A.jpg 01-Mar-19 09:49 PM Clean spot where the Au has been evaporated off the crucible wall because it was off the middle a bit 02-Mar-19 01:00 AM Golden cheerio time 02-Mar-19 11:09 AM we need a golden cheerio emoji on the server 02-Mar-19 11:09 AM just for this 02-Mar-19 11:37 AM XD 02-Mar-19 10:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1662-D89B4.jpg 02-Mar-19 10:27 PM My casual cart o' crudflat and accessories :) 03-Mar-19 12:27 AM So damn sxy! 03-Mar-19 01:25 AM This is super old... Pirani gauge or thermocouple gauge etc? There are 3 “bulbs”, two are not connected to the vacuum vessel. Good 03-Mar-19 01:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-449FE.jpg 03-Mar-19 06:40 AM https://www.youtube.com/watch?v=VEhFTpDx3iA&feature=youtu.be 03-Mar-19 06:40 AM @GigaSquirrel starting his new turbo. 03-Mar-19 06:41 AM """""new""""" 03-Mar-19 06:41 AM TIL: Old leybold pumps need oil priming after standing still for some time 03-Mar-19 06:41 AM that might explain my "issues" 03-Mar-19 06:44 AM oh 03-Mar-19 06:44 AM did you damage anything? 03-Mar-19 06:44 AM don't think so, din't even run for 5 minutes 03-Mar-19 07:17 AM priming done, pumping down again 03-Mar-19 07:32 AM much better 03-Mar-19 07:57 AM https://tenor.com/view/applause-clapping-shaun-the-sheep-fantastic-sheeps-gif-10381185 03-Mar-19 08:01 AM Ja! 03-Mar-19 10:25 AM how did you do the oil priming? 03-Mar-19 10:26 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-03-03_19-26-15-1CF54.jpg 03-Mar-19 12:20 PM conflat? not yet.. it's on my list to learn more about 03-Mar-19 12:20 PM a few things come before that 03-Mar-19 12:24 PM Maybe move to #voiceposting 03-Mar-19 12:25 PM umm... sure 03-Mar-19 12:27 PM (if that was an answer to my question) 04-Mar-19 09:00 AM hum 04-Mar-19 09:00 AM would be nice to have a "better shut your pump down" sound sample collection 04-Mar-19 09:05 AM I like that Idea 04-Mar-19 09:38 AM Like "if you hear this, something is going terribly wrong"? 04-Mar-19 10:01 AM yep! 04-Mar-19 10:01 AM let's move this to #general 04-Mar-19 05:32 PM Digital Tach now on flow bench 04-Mar-19 05:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0142-28392.jpg 04-Mar-19 05:32 PM super easy to hit the desired speed 04-Mar-19 05:34 PM yey 04-Mar-19 06:25 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/15dac0fd-d457-42a0-920a-99c49359c78d-EFA8D.png 04-Mar-19 06:25 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/0e6b06b2-fc53-43c0-907d-7f0da88f4d6f-D11B1.png 04-Mar-19 06:25 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/e661f46a-4ead-4935-8052-1191356c12fd-9C6DF.png 04-Mar-19 06:25 PM my version of the same thing 04-Mar-19 07:29 PM nice - ah, yes, I simply used the existing injector flow bench setup so I didnt have to remount the pump and such 04-Mar-19 07:29 PM I still wish the data I will be collecting was published in some form already 04-Mar-19 07:29 PM time ocnsuming and fairly application/implementation specific 04-Mar-19 07:29 PM pump & fuel combo 04-Mar-19 07:44 PM What were you pumping? was it car related? 04-Mar-19 07:48 PM it's a setup to pressure test old two stage distribution pump injectors 04-Mar-19 07:53 PM did the pumps pass the test? 04-Mar-19 08:03 PM it works the other way around, it's just some old VDO CP3-style CR pump that pressurizes diesel to see when the spring opens in old injectors 04-Mar-19 08:03 PM I just cobbled the setup together with stuff I had laying about in a few hours 04-Mar-19 08:06 PM for this volumetric efficency/flow test I had to buy some solenoid valves + adapters, the variac, and the digital tachometer.. the router was laying around and worked off the 12V, but just barely and obviously wasnt adjustable 04-Mar-19 08:10 PM I'll just run the async off some vfd 04-Mar-19 08:10 PM it's just 3kW or something like that 04-Mar-19 08:10 PM yeah - no VFD in my hands yet 04-Mar-19 08:10 PM working on tooling up 04-Mar-19 08:10 PM nearly ready to buy this swiss jig borer 05-Mar-19 03:31 AM I can confuse you both with your four letter nickname. How about changing your avatar? 05-Mar-19 03:31 AM Bo-rer, bo-rer, bo-rer cherleader dance 05-Mar-19 04:31 AM Bohrer? 05-Mar-19 05:37 AM better? 05-Mar-19 05:57 AM I mean, it's a "face" I can better recognize at a glance. 05-Mar-19 05:57 AM Also, nice frog! 06-Mar-19 01:14 AM starts playing rammstein 06-Mar-19 06:17 AM Du...Du hast... 06-Mar-19 06:18 AM ja, hab ich 06-Mar-19 07:38 AM it burns suprisingly clean 06-Mar-19 07:47 AM Why is four separate jets? 06-Mar-19 07:58 AM 'cause it looks cool 06-Mar-19 08:39 AM I expected something along the lines of "injector shape" 06-Mar-19 11:37 AM it's five actually 06-Mar-19 11:37 AM it's so that you can have enough mass flow in a short enough time 06-Mar-19 12:47 PM Can we have a cutout or model of.the injector tip shape? 06-Mar-19 02:45 PM they all look like that http://www.dbwllc.net/app/uploads/2014/09/IMG_2599.jpg 06-Mar-19 02:45 PM https://i.ebayimg.com/00/s/NTc2WDc3OQ==/z/JSEAAOSwxG9b7Ded/$_20.JPG?set_id=8800005007 06-Mar-19 03:08 PM the spray pattern is offset because they sit at an angle in the engine they were used in 06-Mar-19 03:14 PM so uhm 06-Mar-19 03:14 PM I guess I missed something but why the throwing fire with injectors? 06-Mar-19 03:14 PM just because lol flames? or? 06-Mar-19 03:16 PM some people here are hacking / building engines 06-Mar-19 03:17 PM oh... 06-Mar-19 03:17 PM interesting 06-Mar-19 03:17 PM so like engineering their own ECU type work? 06-Mar-19 03:17 PM I have a friend working on reverse engineering a Subaru ECU atm for his Subaru boxer swapped VW Vanagon 06-Mar-19 03:17 PM lol 06-Mar-19 03:23 PM something like that, but I'm not too much into that tbh 06-Mar-19 03:44 PM I hope that it is a diesel boxer 06-Mar-19 04:52 PM no, its a gasoline engine... not sure subaru made diesel boxers? 06-Mar-19 05:28 PM @Conmega I will be using an opensource ECU (rusEFI) that I will need to mod extensively - and I am going about my [diesel] engine as more of a black box - so near no program/calibration data known before hand, just some basics.. also, super into Open Source and "Free as in Freedom" - so I dont want to borrow/steal from anything else 06-Mar-19 05:28 PM so, I never had the orig ECU to sniff 06-Mar-19 05:28 PM do have the service manual but the electronic diagnosis is more or less: replace the sensor, if still no workie, then replace ECU 06-Mar-19 06:03 PM Awesome! Wish you a lot of luck on that man! 07-Mar-19 04:16 AM @Conmega yes they make diesel boxers 07-Mar-19 04:16 AM which is the only sensible choice for a van 07-Mar-19 10:46 AM Why? Less volume? 07-Mar-19 11:14 AM less specific consumption due to higher thermal efficiency 07-Mar-19 11:15 AM oh yea, sure its a better option, but he has it in there for fun, I think its even turbo'd? 07-Mar-19 11:15 AM like he practically races the thing, its just a fun project vehicle for him lol 07-Mar-19 11:15 AM he's like half mechanic half EE lol 07-Mar-19 11:16 AM you can do the same with a diesel 07-Mar-19 11:16 AM now if you want a diesel to play with I have a CAT 3208NA :) 07-Mar-19 11:16 AM in a 34,000 lbs bus :) 07-Mar-19 11:16 AM and yes... its SLOW 07-Mar-19 11:16 AM 190HP doesn't get you anywhere quickly hahaha 07-Mar-19 11:16 AM egh, that is a pushrod engine, I won't touch that with a stick 07-Mar-19 11:16 AM XD 07-Mar-19 11:16 AM runs like a top though 07-Mar-19 11:18 AM and it is mechanical, that's just no good 07-Mar-19 11:20 AM it is on a 1979 bus so 07-Mar-19 11:20 AM not sure what more you want for 1979 lol 07-Mar-19 04:40 PM well, I have an old injection pump diesel as well, but the pump is electronically controlled 07-Mar-19 05:26 PM Big one! That’s no lecture bottle 07-Mar-19 05:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-42114.jpg 07-Mar-19 10:34 PM Maybe a F-1 rocket engine. XD 08-Mar-19 12:32 AM want! 08-Mar-19 12:58 AM Go figure the cost of that bottle. XDDD 08-Mar-19 12:59 AM pff 08-Mar-19 12:59 AM who needs a house anyway 08-Mar-19 01:12 AM rain protection for instruments? 08-Mar-19 01:15 AM a simple shed can do that 08-Mar-19 09:42 AM Finally got my first alpha spectrum! 08-Mar-19 09:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-89C5C.png 08-Mar-19 09:42 AM the peaks are from left to right: 4.784 MeV Ra-226 5.304 MeV Po-210 5.489 MeV Rn-222 (not really separated from the Po-210 peak) 6.002 MeV Po-218 7.687 MeV Bi-214 08-Mar-19 10:02 AM Nice!! 08-Mar-19 10:02 AM with some spectrum processing one can even separate the Rn-222 and Po-210 peaks 08-Mar-19 10:02 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/ThereminoMCA_2019_03_08_18_56_51-D78CC.png 08-Mar-19 10:08 AM What are you reading these with? 08-Mar-19 10:09 AM a PIPS detector, some pulseforming and my soundcard 08-Mar-19 10:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190308_191422-02B61.jpg 08-Mar-19 10:09 AM Uhh, this isn't even off topic, since I'm using a vacuum in the detector chamber xD 08-Mar-19 10:16 AM :P 08-Mar-19 10:19 AM well... "vacuum" 08-Mar-19 10:19 AM never got the pump below 0.3 mbar 08-Mar-19 10:21 AM XDDD 08-Mar-19 10:21 AM Warning yourself 09-Mar-19 04:55 AM We used to use 226 Ra as the calibration source which is presumably what this is. Do all the energy values match the published values for these nuclides? 09-Mar-19 04:55 AM Soundcard! Nice! Probably better than ye old Canberra MCA card. 09-Mar-19 04:55 AM Can you plot it by raw ADC channel to check that it’s linear, and manually get a linear fit to convert it to MeV? Or do you have fancy software doing that for you? 09-Mar-19 04:57 AM he uses theremino afaik 09-Mar-19 05:02 AM aye, I'm using theremino 09-Mar-19 05:02 AM not impressed tbh, seems pretty... instable 09-Mar-19 05:02 AM as in: takes ages to find settings that work and there is no garantuee that it'll work again after a restart of the systemn 10-Mar-19 09:53 AM hmm, got something new (for me) from the scrapyard: 10-Mar-19 09:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_8040-BA099.JPG 10-Mar-19 09:53 AM a molecular drag pump. with roughing pump integrated into the base: 10-Mar-19 09:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_8044-37594.JPG 10-Mar-19 09:53 AM i had completely forgotten this pumping principle even existed... 10-Mar-19 10:00 AM for reference: This is what it looks like on the inside 10-Mar-19 10:00 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-97038.png 10-Mar-19 10:36 AM almost like a centrifuge? 10-Mar-19 10:36 AM or more so like a tesla pump 10-Mar-19 10:36 AM tesla turbine 10-Mar-19 11:06 AM more like a tesla turbine I think 10-Mar-19 11:06 AM since it doesn't rely on centrifugal force but molecular drag 10-Mar-19 11:09 AM right right 10-Mar-19 12:12 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190310_200914-99BF6.jpg 10-Mar-19 12:12 PM 4.1e-8 mbar in an all KF / ISO chamber 10-Mar-19 12:12 PM anyone wanna top that? 10-Mar-19 12:14 PM I mean I have two cryo compressors... :) Once I get heads for them... 10-Mar-19 12:14 PM Lol, but no that's awesome, really fantastic work! 10-Mar-19 12:15 PM would using duct tape top it? 10-Mar-19 12:17 PM using ducttape and getting down to e-8? 10-Mar-19 12:17 PM only on Tuesdays 10-Mar-19 12:17 PM e-6 on the other days of the week 10-Mar-19 12:34 PM chamber is cooling down, I'm at 2.7e-8 10-Mar-19 12:34 PM do I dare going for e-9 this week? 10-Mar-19 12:35 PM I mean it doesn't hurt does it? :P 10-Mar-19 12:35 PM yepp, u will 10-Mar-19 12:35 PM next week your safe gonna hit it 10-Mar-19 12:36 PM I can already see it coming, I'll boil off my o-rings at somewhere around e-11 xD 10-Mar-19 12:41 PM I NEED LOWER PRESSURE heats the chamber red hot glowing 10-Mar-19 12:52 PM lemme get the blowtorch 10-Mar-19 12:58 PM How are chambers typically heated? 10-Mar-19 12:58 PM with a... heater? 10-Mar-19 12:58 PM I'm imagining nichrome 10-Mar-19 12:58 PM or kanthal wire 10-Mar-19 12:58 PM I wrapped some turns of heater wire around it 10-Mar-19 12:58 PM ah, okay 10-Mar-19 12:58 PM around the outside 10-Mar-19 12:58 PM yep 10-Mar-19 12:58 PM roger 10-Mar-19 01:17 PM are KF/ISO connections particularly worse than some other fittings? (I'm a total newb when it comes to vacuum fittings) 10-Mar-19 01:18 PM worse than CF or other metal sealed connectors in regards to baking and sealing 10-Mar-19 01:18 PM better than triclamp and pipe fittings in every other case 10-Mar-19 01:19 PM is there a vacuum fittings for dummies page anywhere? 10-Mar-19 01:19 PM I don't know what a KF/ISO/CF even look like in comparison 10-Mar-19 01:19 PM I mean, sure I can search them individually 10-Mar-19 01:22 PM Pfeiffer's compendium is great 10-Mar-19 01:22 PM i posted a link some time ago in #resources 10-Mar-19 01:22 PM here https://www.pfeiffer-vacuum.com/en/know-how/ 10-Mar-19 01:26 PM awesome, I just learned how to use the search here 10-Mar-19 01:26 PM seems the only mention of compendium was from nixie 10-Mar-19 01:26 PM but now I've got a bunch to read for a while! 10-Mar-19 01:26 PM thanks! 10-Mar-19 01:27 PM no problem 10-Mar-19 01:27 PM back to taxes, ugh 10-Mar-19 01:27 PM oh, and they made one mistake, on one picture they referred to ISO-F as ISO-K. :-D 11-Mar-19 05:18 PM just slightly out of regulation (determining length of a brand new balance/hairspring being built to a 18000 VBH Master).. video, open original.. https://photos.app.goo.gl/pgvRrSfx7hHXh6rH7 11-Mar-19 05:18 PM and regulated: https://photos.app.goo.gl/7WQaCmN42PnCPVhL7 11-Mar-19 05:18 PM the goal is 20+s 11-Mar-19 05:18 PM got basically a full minute on the last one 11-Mar-19 11:29 PM 12-Mar-19 01:12 AM wow 12-Mar-19 08:05 PM got a new watch today, can show it off if it interests people 12-Mar-19 08:05 PM also, formed the hairspring from those videos yesterday (I was locating the distance required) 12-Mar-19 08:05 PM first hting in the morning will be cleaning everything and reassembly 12-Mar-19 08:05 PM and timing it out 12-Mar-19 08:05 PM first hairspring/balance "made" 12-Mar-19 11:10 PM Show it, show it! 13-Mar-19 02:44 PM Hah, it isnt great.. Plus its for a eta 6497 which is just an undersized pocketwatch movement, super big and lame, but it is the main one we use first year 15-Mar-19 10:08 AM Finally have the main spark gaps assembled for the first stage of the pulsed power driver. I still need to design and build two much larger output switches, but it's still a big milestone: 15-Mar-19 10:08 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190315_124638_062-38E4E.jpg 15-Mar-19 10:08 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190315_124638_063-7B444.jpg 15-Mar-19 10:09 AM Awesome!!! They look great! 15-Mar-19 10:09 AM Probably a couple of weeks away from finishing the first stage and running tests. I will probably try to run beam without the second pulse compression stage at first to save money and start qualifying beam, but I'm going to have to do a rather unconventional interface to make it work 15-Mar-19 10:09 AM @Conmega thanks! 15-Mar-19 10:20 AM Niiiiiiiiiiiiiiiiiiiice 15-Mar-19 10:20 AM they look like aligned tie fighters (not a fan of SW, but i know the imagery) XDDD 15-Mar-19 10:27 AM @Nixie yeah, that's the first thing I thought when I finished lol 18-Mar-19 07:17 AM A new bias tee and amplifier for those USSR neutron detectors. Better than the messy dead bug one naked on my bed with exposed kilovolts 18-Mar-19 07:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-9B5D0.jpg 18-Mar-19 07:27 AM neat! 18-Mar-19 07:27 AM is the amp still "my" design? 18-Mar-19 07:27 AM did you get any usefull pulses out of your tube? 18-Mar-19 07:56 AM Yes 18-Mar-19 07:56 AM And still trying 18-Mar-19 07:56 AM Transistor is MMBT3904 18-Mar-19 07:58 AM the transistor looks fine 18-Mar-19 07:58 AM good luck with that ^^ 18-Mar-19 07:58 AM oh, and if you haven't done so yet, please use the best cables you've got 18-Mar-19 07:58 AM I've had tonnes of issues with just medium quality cable 18-Mar-19 07:58 AM oh, and I recommend something like RG62 from the bias resistor to the tube itself 18-Mar-19 10:11 PM Short cable 18-Mar-19 10:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-9A151.jpg 18-Mar-19 10:11 PM Resistor is 47M, HV capacitor is 100pF 18-Mar-19 10:11 PM This SHV cable I got on AliExpress is completely unmarked but feels like maybe RG59 22-Mar-19 12:31 PM Handpusher.. 22-Mar-19 12:31 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0164-058AE.jpg 22-Mar-19 12:31 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0165-02837.jpg 22-Mar-19 12:31 PM in RAL6011, reseda green 22-Mar-19 12:32 PM cute 22-Mar-19 12:32 PM took forever to make, never again 22-Mar-19 12:32 PM lol 22-Mar-19 12:32 PM that cross slide is just adorable too XD 22-Mar-19 12:32 PM it should last me a lifetime 22-Mar-19 12:32 PM oh yeah 22-Mar-19 12:32 PM one rev = 0.75mm 22-Mar-19 12:32 PM which makes doing multiple mm hard 22-Mar-19 12:32 PM because you have to do maths 22-Mar-19 12:33 PM heh... precision is nice though 22-Mar-19 12:33 PM preciscion doesnt really mean small movement 22-Mar-19 12:33 PM but I get you 22-Mar-19 12:33 PM All the screws and the roller was hardened & blued 22-Mar-19 12:33 PM I repan'd the aluminum rotor disk, and also "snail" finished it 22-Mar-19 12:33 PM you can see the lgiht reflect in a spiral pattern on the first pic 22-Mar-19 12:33 PM anywho... spring break starts now! 22-Mar-19 12:33 PM working on the house though 22-Mar-19 12:33 PM first up: cubano sandwhich... so.. bbl! 22-Mar-19 01:49 PM Oh! awesome!! 22-Mar-19 02:22 PM yums 23-Mar-19 07:17 AM Titanium wire in a ring 23-Mar-19 07:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-49CC0.jpg 23-Mar-19 07:17 AM 9B pencil cut up 23-Mar-19 07:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-DF3BE.jpg 23-Mar-19 07:17 AM Attempting to carbon arc weld with 13.8 V high current supply 23-Mar-19 07:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-06094.jpg 23-Mar-19 07:17 AM This didn’t work - I either don’t get a successful weld or I burn it through- can’t find the sweet spot in the middle 23-Mar-19 07:35 AM did you do it in air or some gas? 23-Mar-19 07:35 AM if i remember right you don't need high current, but rather good regulation, maybe go for something like 50 V 0.5 to 1 A 23-Mar-19 07:58 AM hmm, I just played around with a 20 A supply and some tungsten, I could not get an art to form 23-Mar-19 07:58 AM same at less current 23-Mar-19 08:07 AM but with a big inductance I can go as low as 10 A and get a stable arc 23-Mar-19 12:13 PM Also titanium will need some.ineet atmosphere, otherwise the oxidation will make the join crack easily (afaik) 23-Mar-19 05:39 PM umm... do people want to see my superglue stitches I just gave myself on my noggin? 23-Mar-19 05:39 PM or is that disgusting 23-Mar-19 05:39 PM no time to run to the hospital and get stitches 23-Mar-19 05:39 PM I have stuff to do! 24-Mar-19 12:25 AM Yeah I should try argon 24-Mar-19 12:25 AM This was in air with a 13.8V bench supply and no current regulator 24-Mar-19 03:03 AM Noggin? 24-Mar-19 03:03 AM @GigaSquirrel has some recent ones. Mine just healed two days ago. 24-Mar-19 03:04 AM cough cough 24-Mar-19 03:04 AM and I'll happily blame nixie for them 24-Mar-19 08:18 AM @Nixie head 24-Mar-19 09:06 AM @GigaSquirrel I don't see any preaching of the Lord and Cutter. 24-Mar-19 09:06 AM In your head? What where you doing?! 24-Mar-19 09:09 AM ontop of my head 24-Mar-19 09:09 AM I was putting up scaffolding to work on the house and the "floor" of it fell on my head from ~8ft high 24-Mar-19 09:09 AM I was wearing a baseball cap as my only protection, and safety glasses 24-Mar-19 09:09 AM for the remainder of the outside work I will wear my bicycle helmet 24-Mar-19 11:07 AM XDDDDDDDDDDD 24-Mar-19 11:07 AM yeah, pretty unexpected. 24-Mar-19 11:07 AM well, glad you didn't do anything major 24-Mar-19 07:22 PM FIB progress... currently working on replacing a bracket that holds up the top sheet metal panel, the screws were stripped before I got it home, only really annoying when the left door is open http://diyhpl.us/~nmz787/pdf/smi3200/pics.html 24-Mar-19 07:22 PM got it swapped to take 240V, got the extension cord all done and wall socket too 24-Mar-19 07:22 PM after this bracket, I'll vacuum the whole thing (HEPA vac) 24-Mar-19 07:22 PM also starting to think about getting a ceiling HEPA, or rigging some walmart items to the ceiling and sides, and inside the not-so-dirty room to start 24-Mar-19 08:17 PM are those black bricks with cylinders ontop of them (that then supports the frame) vibration isolation dampeners? 24-Mar-19 09:00 PM woooww super cool @nmz787 25-Mar-19 02:16 AM @Noxz I think they're rubber, but I'll check tomorrow... guessing they're a first stage vibration dampener, and I assume the cylinders above are pneumatic. At the very bottom of the unit there are more metal cylinders with the word "positioning" written next to it... not sure if they're also potential pneumatic dampeners, or just for leveling 25-Mar-19 02:16 AM got the computer desk all cleaned off, same with the monitors and keyboard and mouse and focus/zoom control panel. got them all connected together 25-Mar-19 02:16 AM took the back panel off the power/control cabinet... but my vacuum cleaner ran out of battery so I didn't start cleaning the dust in there yet. I guess I'll start connecting cables between the units tomorrow, probably 25-Mar-19 02:51 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190325_224654-8BA16.jpg 25-Mar-19 02:51 PM some sweet ion optics 25-Mar-19 02:51 PM lewd! 25-Mar-19 04:44 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_xwnjms-34011.jpg 25-Mar-19 04:44 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190325_230343-F1846.jpg 25-Mar-19 06:02 PM Is that pink stuff sweet sweet BeO ? Or alumina ? 25-Mar-19 06:02 PM This NW16 vacuum transducer is small and adorable 25-Mar-19 06:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-A0C8D.jpg 25-Mar-19 08:07 PM Ah yup! You got one! They are awesome little gauges 25-Mar-19 08:07 PM simple with serial, can download the software, works great with a usb to serial adapter, and has programmable relay outputs for automation? yes please 25-Mar-19 09:57 PM I've got one of those transducers 25-Mar-19 09:57 PM was aiming to mount it on my SEM 26-Mar-19 06:25 AM Remember they are only good to a certain vacuum range. Its a pretty wide range, but you'll want some kind of Ion Gauge for HV/UHV readings 26-Mar-19 06:27 AM @a_quiet_scientist I highly assume alumina, since I can't see why they should've used BeO, and alumina ceramics are also often pink colored 27-Mar-19 04:42 AM Yeah they cover something like 1e3 to 1e-5 torr. Not really high vacuum but good enough for a fusor pretty much and they cover all the way up to atmosphere. 27-Mar-19 04:42 AM They are cute. Like putting the uwu in vacuwum 27-Mar-19 04:54 AM vac 〰 m 27-Mar-19 06:17 AM ffs XD 29-Mar-19 12:53 PM https://twitter.com/0xDBFB7/status/1111700469758509057 @0xDBFB7 reaching high vacuum for the first time 29-Mar-19 01:03 PM congrats! welcome to the club 29-Mar-19 01:03 PM what about a rank for that? 29-Mar-19 01:04 PM @Koelzer the club? Where is your evidence of reaching HV? 29-Mar-19 01:04 PM surely I did send you a pic of my first turbo tests 29-Mar-19 01:04 PM hm, must search a bit 29-Mar-19 01:05 PM what about a rank for that? Thought about that, but tbh it's a bit easy to reach 29-Mar-19 01:05 PM ok, so is the dead gauge society, but that's a running gag 29-Mar-19 01:08 PM I think it would be cool to have a few ranks: Vacuum High Vacuum Ultra High Vacuum Maybe some others like: Vacuum Explorer Vacuum Enthusiast Vacuum Expert 29-Mar-19 01:09 PM A sucker for Vacuum 29-Mar-19 01:09 PM I am hoping to reach UHV someday, if for no reason but to say I did :) 29-Mar-19 01:09 PM hahaha @GigaSquirrel that should be the "noob" first to join the server rank 29-Mar-19 01:09 PM UHV begins at e-7, right? 29-Mar-19 01:09 PM where's XHV? 29-Mar-19 01:10 PM Is it? herm leme get a chart 29-Mar-19 01:10 PM https://vacaero.com/wp-content/uploads/2012/02/vacuum_ranges_lg-1.gif 29-Mar-19 01:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190329_211047-6826A.jpg 29-Mar-19 01:11 PM huh, never noticed the crack in the wall irl 29-Mar-19 01:12 PM <0xDBFB7#9254> darn, I'm still half an order of magnitude away from HV 29-Mar-19 01:12 PM But yea I'll be getting two Cryo pumps tomorrow so UHV will be achievable no problem :) 29-Mar-19 01:12 PM Just need hoses... probably a cylinder of helium... and a 3 phase converter still lol 29-Mar-19 01:13 PM UHV can easily be done with a turbo and baking 29-Mar-19 01:13 PM I wouldn't divide into experts etc. but the Vacuum side would be cool 29-Mar-19 01:13 PM no need for cryos 29-Mar-19 01:13 PM unless you have a gas load of some sort 29-Mar-19 01:13 PM @Koelzer its not to put prestige on people but to give people an idea of who they can ask for help 29-Mar-19 01:14 PM I don't think it's that easy to reach HV, you would need an high vacuum pump it a bit equip for that 29-Mar-19 01:14 PM It need some effort 29-Mar-19 01:14 PM just ask your question and people will respond/discuss I guess? :D 29-Mar-19 01:14 PM I mean everyone has his one field of expertise, hard to put that in 3 ranks or so 29-Mar-19 01:16 PM sure 29-Mar-19 01:20 PM dunno, no friend of this idea, just my opinion 29-Mar-19 04:16 PM Ware there such a rank, what would qualify? I can press a button at work, wait 18hours and have 10^-8 mBar. 29-Mar-19 04:16 PM My hobby stuff is nowhere near that. but if I borrowed that spare turbopump station from work, would it count? 29-Mar-19 05:09 PM the ranks seem like they could conflate expertise with what people have achieved in their own garage/shop... akin to what @rfs said... 29-Mar-19 06:07 PM I think there is a lot more to vacuum expertise than hitting a particular vacuum level, it can be an incredibly involved field 29-Mar-19 06:23 PM It can be relatively easy to hook up a high vacuum pump to a chamber, bake it, and pump to UHV. The real measure is being able to engineer vacuum systems across the entire range, for any application, process, gas load, as well as perform analysis, simulation, and optimization of the system, and have a solid background in the fundamentals and advanced physics behind vacuum technologies and phenomenon. None of this is needed really to put together a working high vacuum chamber, but if you want to prove expertise to a level where you could call yourself an expert, that takes time. At least in summary, I don't think rank or title should be based on ultimate vacuum level reached alone. 30-Mar-19 04:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190330_123827-794BD.jpg 30-Mar-19 04:46 AM finally got the thermocouple for my oven working 30-Mar-19 04:46 AM had an internal break, so I had to cut it open and "rewire" it 30-Mar-19 04:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190330_124702-6A6F4.jpg 30-Mar-19 09:37 AM <0xDBFB7#9254> @GigaSquirrel type R or B? 30-Mar-19 09:37 AM S 30-Mar-19 09:38 AM <0xDBFB7#9254> whew, nice 30-Mar-19 09:38 AM Yep! 30-Mar-19 09:38 AM <0xDBFB7#9254> what kind of oven is that? 30-Mar-19 09:38 AM <0xDBFB7#9254> zirconia-style molybdenum disilicide? 30-Mar-19 09:39 AM it was a pretty SiC(k) one up to 1600°C with silicon carbide heating elements and 9 kW 30-Mar-19 09:39 AM <0xDBFB7#9254> holy crap 30-Mar-19 09:39 AM but I got it without the heaters and thermocouple 30-Mar-19 09:39 AM so I'm "rebuilding" it, but with kanthal and 2 kW 30-Mar-19 09:39 AM so only 1300 to 1400°C and way slower heating, but at least it can run on a normal outlet 30-Mar-19 09:42 AM <0xDBFB7#9254> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20181111_161914_HDR-3AD16.jpg 30-Mar-19 09:42 AM <0xDBFB7#9254> rather less professional 30-Mar-19 09:42 AM I needed an oven for glazing ceramics and got that one for cheap ^^ 30-Mar-19 09:42 AM at least yours works 30-Mar-19 09:42 AM <0xDBFB7#9254> for sufficiently low values of "works" 30-Mar-19 09:43 AM gets hotter than ambient = works 30-Mar-19 09:43 AM <0xDBFB7#9254> hah 30-Mar-19 09:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190222_130852-13024.jpg 30-Mar-19 09:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190222_130905-8FAC9.jpg 30-Mar-19 09:45 AM <0xDBFB7#9254> what kind of refractory brick do those things use? 30-Mar-19 09:45 AM <0xDBFB7#9254> Al2O3? 30-Mar-19 09:46 AM the manufacturer literally states "unspecified fibre material" 30-Mar-19 09:46 AM <0xDBFB7#9254> that's wonderful 30-Mar-19 09:46 AM oh and non cancerous 30-Mar-19 09:46 AM so I got that going for me 30-Mar-19 09:47 AM <0xDBFB7#9254> that's pretty slick 30-Mar-19 09:48 AM >>High-quality non-classified fiber material, selected for the working temperature 30-Mar-19 09:48 AM <0xDBFB7#9254> perfect balance of descriptive and ambiguous 30-Mar-19 09:49 AM Yep... 30-Mar-19 09:49 AM but hey as long as it works 30-Mar-19 09:49 AM I ordered ceramic rods today to wind the heating wire on it 30-Mar-19 09:50 AM <0xDBFB7#9254> I guess the heaters go in the pockets at the back? 30-Mar-19 09:50 AM <0xDBFB7#9254> (or would have originally) 30-Mar-19 09:51 AM https://www.nabertherm.de/produkte/labor/hochtemperaturoefen/Large/HTC08_16_fmt.jpg 30-Mar-19 09:52 AM <0xDBFB7#9254> ah neat, like the mica heaters in toaster ovens 30-Mar-19 09:52 AM <0xDBFB7#9254> except more extreme 30-Mar-19 09:52 AM Yep 30-Mar-19 09:52 AM well, I didn't exactly order the rods but ask a company if they have the right ones 30-Mar-19 09:52 AM so let's hope for the best ^^ 30-Mar-19 12:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1796-DA481.jpg 30-Mar-19 12:50 PM I bought some stuff :) 30-Mar-19 01:00 PM uhhh 30-Mar-19 01:00 PM very cool 30-Mar-19 01:03 PM I'll get some better photos later :) 30-Mar-19 01:03 PM Got some nice feed throughs 30-Mar-19 01:05 PM Also cryo hose? 30-Mar-19 01:05 PM One... Yes.. Unfortunately he didn't have one more lol 30-Mar-19 01:05 PM I can get them all day long on ePay but not for this cheap lol 30-Mar-19 01:05 PM Well half way there 30-Mar-19 01:08 PM eh... 1/3rd... still need 3Phase lol 30-Mar-19 01:08 PM Also they both aren't conflat, one is ISO 30-Mar-19 01:08 PM Also @AdamMcCombs know the varian Ion controller hooked to my SEM? That varian box on the left looks like the exact same controller lol 30-Mar-19 01:08 PM So have a backup or second ion controller now 30-Mar-19 01:13 PM Nice 30-Mar-19 01:13 PM Those can go on occasion, but the Varian ones were pretty robust 30-Mar-19 01:14 PM Yea, I figured I might have an ION pump at some point and its a nice controller. Seems fairly universal. 30-Mar-19 04:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1798-1A02C.jpg 30-Mar-19 04:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1800-212A6.jpg 30-Mar-19 04:43 PM Pretty sure this alcatel is a fresh rebuild. 30-Mar-19 04:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1801-36834.jpg 30-Mar-19 04:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1802-8E4E2.jpg 30-Mar-19 04:43 PM That fill viewport is too clean to not have been rebuilt lol 30-Mar-19 04:51 PM So nice. 30-Mar-19 04:51 PM And orange. XD 30-Mar-19 05:09 PM She runs good 30-Mar-19 05:09 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1804-42631.jpg 30-Mar-19 05:09 PM Probably some leaks and outgassing in my jank chamber 30-Mar-19 05:39 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1805-8485C.jpg 30-Mar-19 08:55 PM Other stuff I got from that guy 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1808-E9D8C.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1811-4B0ED.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1812-B70BD.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1813-9AEDB.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1814-DA993.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1815-41F81.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1816-2C47B.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1817-AFD5A.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1818-F1198.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1819-89824.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1820-42E99.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1823-783CE.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1821-C5974.jpg 30-Mar-19 08:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1822-D629C.jpg 30-Mar-19 08:55 PM I think I can pass some current into a chamber now :) 30-Mar-19 09:21 PM I'm really jelous of that piece 30-Mar-19 10:02 PM Heh yeaaa... Really glad I saw that. But do you have 8" conflat? :P 30-Mar-19 10:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1824-9F4B0.jpg 30-Mar-19 10:02 PM Exact model as is on the SEM woot 31-Mar-19 01:14 AM so many nice parts 31-Mar-19 01:14 AM now you only need another helium hose 31-Mar-19 08:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1827-85257.jpg 31-Mar-19 08:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1828-484EB.jpg 31-Mar-19 08:29 PM Chamberrrr 31-Mar-19 08:30 PM I mean 31-Mar-19 08:30 PM Manifold? 31-Mar-19 08:35 PM Hm? 31-Mar-19 08:35 PM It's got a viton oring instead of copper on one of the conflats 31-Mar-19 08:35 PM So I can open it... 31-Mar-19 08:36 PM I'm just making a joke that in big setups those parts are used as plumbing for a bigger chamber 31-Mar-19 08:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1830-F7DB4.jpg 31-Mar-19 08:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1829-65A85.jpg 31-Mar-19 08:36 PM Oh I know... In a few days I should have the adapter to put this pump on my larger chamber. 31-Mar-19 08:36 PM This is for fun :) 31-Mar-19 08:37 PM What's the deoxit for? 31-Mar-19 08:46 PM Also oh my god is that my abomination of a vapor trap? 31-Mar-19 08:49 PM Yup. Still haven't replaced the filter in the EMF10... I want to get as much life as I can lol 31-Mar-19 08:49 PM Too expensivr 31-Mar-19 08:49 PM Deoxit was for the varian ion controller 31-Mar-19 08:49 PM Knobs were seized internally 31-Mar-19 08:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-2A42C.png 31-Mar-19 08:58 PM the pump works but I probably have leaks and outgassing like mad 31-Mar-19 08:58 PM its also a really weird KF/CF chamber 31-Mar-19 08:58 PM with lots of turns and bends 31-Mar-19 08:58 PM also the turbo is running slow 31-Mar-19 08:58 PM its really slowly dropping 31-Mar-19 08:58 PM this gauge will only go to 1.0E-5 I think 31-Mar-19 09:22 PM Yeah with only a reasonable outgassing load and a turbo even at a slow speed you should fall below -5 supper fast. 6 is slower, 7 is bake out if you want to do it quickly. 31-Mar-19 09:22 PM That high of -4 is likely a leak 31-Mar-19 09:22 PM Im assuming that the turbo is running at some reasonable percentage or operating speed. 31-Mar-19 09:25 PM I think it calculated it to be around 51K RPM instead of its top 75K RPM 31-Mar-19 09:25 PM so its "reaasonable" I suppose 31-Mar-19 09:25 PM its slowly coming down 31-Mar-19 09:25 PM at 7.40E-4 now 31-Mar-19 09:25 PM but yea probably a leak 31-Mar-19 09:26 PM Yeah. The leak rate is what I would really want to see, but that is not going to be useful until at least 8-16 hours of pumping at the soonest. 31-Mar-19 09:26 PM yea... 31-Mar-19 09:26 PM there is ONE re-used conflat bit on here, and its the 4.5" since I have yet to order a set from LDS I stole it from another part, its one of those silver plated copper ones, I torqued it down pretty good assuming it will be out of commision after this use 31-Mar-19 09:26 PM but I dunno if I torqued it down enough 31-Mar-19 09:26 PM all the 2.75" is new but some of the knife edges did have some nicks here and there 31-Mar-19 09:28 PM Do you have a tourque wrench yet? 31-Mar-19 09:28 PM yes 31-Mar-19 09:28 PM Also are you going around multiple times? 31-Mar-19 09:28 PM but its a PITA to get it in some places 31-Mar-19 09:28 PM yes 31-Mar-19 09:28 PM star pattern or something like it 31-Mar-19 09:28 PM like I understand how to torque things in not the worst way :) 31-Mar-19 09:28 PM maybe not the best 31-Mar-19 09:28 PM but definitely far from the worst 31-Mar-19 09:28 PM could also be the electrical feed through leaking 31-Mar-19 09:28 PM or some of the KF 31-Mar-19 09:28 PM but yea 31-Mar-19 09:29 PM You dont have an ion guage running do you? 31-Mar-19 09:29 PM not yet I have one on there 31-Mar-19 09:29 PM but the controller I forgot at that guy's place he is going to ship it 31-Mar-19 09:29 PM that hastings gauge remember? 31-Mar-19 09:29 PM wana voice chat for a little bit? 31-Mar-19 09:29 PM talk nerdy for a bit while I run this and before I get off for bed 31-Mar-19 09:30 PM Uh maybe 31-Mar-19 09:30 PM give me like a minute 31-Mar-19 09:31 PM K I'll be in voice chat 31-Mar-19 09:31 PM or we could do a private call so I can show you stuff 31-Mar-19 11:20 PM w00t, I got a lathe!.. pics upon cleaning it up 31-Mar-19 11:24 PM Awesome!!! Congrats! 01-Apr-19 01:19 AM @Conmega that's "CHAMBER-TRON!" with the power of friendship, vacuum and explosive decompression! 01-Apr-19 11:14 AM New chamber \o/ 01-Apr-19 11:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_201330-23F9D.jpg 01-Apr-19 11:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_201320-B364C.jpg 01-Apr-19 11:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_201348-DF2B0.jpg 01-Apr-19 11:14 AM with weird-arse gold sealed flanges everywhere 01-Apr-19 11:14 AM but hey, now I got gold xD 01-Apr-19 11:14 AM Thanks @Koelzer ❤ 01-Apr-19 11:42 AM Toolz 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_133813-85A07.jpg 01-Apr-19 11:42 AM In this episode Mr. rfs changes a broken connector on a pheiffer vacuum gauge 01-Apr-19 11:42 AM The problem with the connector 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_112527-58B12.jpg 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_112336-E10B7.jpg 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_112443-E005A.jpg 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_112401-F7C6A.jpg 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_112350-BAF69.jpg 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_112343-72711.jpg 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_112409-54EB1.jpg 01-Apr-19 11:42 AM Gauge electronics stack 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_112220-9D793.jpg 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_112230-E29B6.jpg 01-Apr-19 11:42 AM Stack open 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_111525-8F78F.jpg 01-Apr-19 11:42 AM Burned 10ohm MELF resistor 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_114008-1ACED.jpg 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_111538-7DB56.jpg 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_111550-DE3E9.jpg 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_111545-E9025.jpg 01-Apr-19 11:42 AM Burned 10ohm MELF resistor in an other gauge 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_105449-89E3F.jpg 01-Apr-19 11:42 AM "Fabricated" replacement connector next to what it replaces and what it was made from. 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_132110-94248.jpg 01-Apr-19 11:42 AM That connector is the only model I was able to find on farnell 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_132052-861A5.jpg 01-Apr-19 11:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_132100-C7091.jpg 01-Apr-19 11:49 AM do you know why the 10Ohm burned? 01-Apr-19 11:49 AM Fancy engineering. 01-Apr-19 11:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_131925-2AB67.jpg 01-Apr-19 11:49 AM @Pan Da Yes, 01-Apr-19 11:49 AM Faulty cable manufactured by a subcontractor 01-Apr-19 11:49 AM Output signal & Signal ground got swapped with Gauge power + power ground 01-Apr-19 11:49 AM power ground and signal ground are internaly connected by that 10ohm resistor 01-Apr-19 11:49 AM The other gauge was IIRC just a wiring mistake or something 01-Apr-19 11:49 AM The broken connector was from using too much torque, but They are still VERY easy to break, not a very robust connector imo. 01-Apr-19 11:49 AM Removed connector 01-Apr-19 11:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_131402-14012.jpg 01-Apr-19 11:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_131135-EA3ED.jpg 01-Apr-19 11:52 AM ah, ok. good to know - maybe i should check my PKRs, i think there was one behaving strangely. maybe it's got that problem, too 01-Apr-19 11:55 AM Installed "new" connector 01-Apr-19 11:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_132843-E1FE8.jpg 01-Apr-19 11:55 AM The resistor is easy to measure from the outside 01-Apr-19 11:55 AM It should show around 10ohms between the power and signal ground 01-Apr-19 11:55 AM In newer gauges it's 4R7 ohms 01-Apr-19 11:56 AM yep, exactly 01-Apr-19 11:57 AM And I know that because the folks diagnosing strange pressure readings replaced the gauge with a new model before suspecting the cable (we had one gauge fail in the field, so it's not a completely idiotic thing to do). 01-Apr-19 11:57 AM pof oh. 01-Apr-19 11:57 AM Anyway here's a cauple of pictures of the insides of the new sleek red pheiffer gauges 01-Apr-19 11:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_104855-93A37.jpg 01-Apr-19 11:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_104901-A6F52.jpg 01-Apr-19 11:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_104849-DA507.jpg 01-Apr-19 11:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_111414-E37F4.jpg 01-Apr-19 11:57 AM Did not have 1206 size 4R7 so I plopped in 2x 10R 0805 resistors. As a collegue was all "fix it fix it fix it". 01-Apr-19 11:57 AM And it's gona be used for internal stuff only. 01-Apr-19 11:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190401_114204-4BD40.jpg 01-Apr-19 11:57 AM The test system could also use some debugging. I have routinely pulled 10^-6 mBar with it in the past. 01-Apr-19 12:02 PM @GigaSquirrel awesome, I hope it's useful for you, if somethings missing tell me, I show you what would maybe fit and ship soon 01-Apr-19 12:02 PM I still have one faulty fullrange gauge left to repair. 01-Apr-19 12:02 PM a flange for the big opening would be interesting 01-Apr-19 12:03 PM A trickier one due to it showing pressure one decade off 01-Apr-19 12:03 PM helpfulllll 01-Apr-19 12:04 PM I suspect some chucklefuck (like me!) applied 17volts to the signal output and fried something important, or there was other problems elsewhere and people broke the 12turn trimmers while trying to calibrate it. 01-Apr-19 12:04 PM I think this one got +17V applied to it's signal output. 01-Apr-19 12:05 PM @rfs excuse me some what now did that 01-Apr-19 12:05 PM And in addition to that the calibration trimmers might be faulty due to then folks attempting to calibrate the x10 fauly readings away. 01-Apr-19 12:05 PM Thankfully the older gauges seem to be fully analog without anything too specialized, so some good ol' reverse engineering and tracing stuff with a scope and multimeter might reveal the fault. 01-Apr-19 12:05 PM @GigaSquirrel I'm not sure if the mistake was mine or a co-workers. Most certainly I was not the first one to mess up with the gauge power. 01-Apr-19 12:07 PM No I just like the word you used xD 01-Apr-19 12:07 PM Dunno how I rank in the "Dead Gauges Society", as I have both killed and repaired gauges.(edited impolite term away, I guess the prudebot is here for some reason, better not circuvement it too much) 01-Apr-19 12:07 PM THat one? 01-Apr-19 12:08 PM Yes 01-Apr-19 12:10 PM And I STILL need to build some electronics and cables for my hornets. At least I found the required adapters in the "vacuum stuff" box at work. 01-Apr-19 01:20 PM did you change the caps? 01-Apr-19 01:20 PM XDDDDDDDDDD 01-Apr-19 01:31 PM @GigaSquirrel Not yet. I have not even powered them up. 01-Apr-19 01:32 PM Ok ^^ 01-Apr-19 01:32 PM Gona open them up tomorrow and check the cap values and order some from farnell at work. "Yes yes we can use these ebay finds to sanity check these brand new +700eur pheiffer gauges." 01-Apr-19 01:32 PM Stupid question ( I should read the manual & datasheet fully), can I power them up in atmospheric pressure? or is it just gona arc over or just not work? 01-Apr-19 01:33 PM you can power them up, activating the filament is a different step 01-Apr-19 01:33 PM lust applying power won't hurt them 01-Apr-19 01:33 PM but if you tell it to start heating it will heat until it realizes pressure is too high 01-Apr-19 01:33 PM which it may survive, but it's not gonna be great for the filament 01-Apr-19 01:36 PM Ok good to know. I wonder what logic the full range pheiffer guages use for that 01-Apr-19 01:38 PM it starts the pirani first to check if it can start the penning 01-Apr-19 01:38 PM at ~e-4 there's an intermediate range where both are used 01-Apr-19 02:05 PM OK, I guess there's a comparator in there to do just that. 01-Apr-19 02:05 PM Aye 01-Apr-19 02:51 PM Not sure I had a photo of the "completed" hand pusher because ran out of battery before.. 01-Apr-19 02:51 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0209-1C6DA.jpg 01-Apr-19 02:51 PM Also, new quarter, we started on quartz movements today 01-Apr-19 02:51 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0210-55672.jpg 01-Apr-19 02:51 PM Says 7 jewels, rubies, fairly small in comparison to mechanical watches 01-Apr-19 02:51 PM ETA 955 01-Apr-19 02:59 PM I was looking at this watch escapement (mostly) 3d-printable a few weeks ago https://www.thingiverse.com/thing:3364860 01-Apr-19 03:19 PM The Pfeiffer gauge tear down is beautiful! 01-Apr-19 03:19 PM Nice chamber @GigaSquirrel 01-Apr-19 03:20 PM thanks ^.^ 01-Apr-19 03:21 PM Yea can't wait to see you have stuff hanging off that 01-Apr-19 03:21 PM but you're gonna have to wait 01-Apr-19 03:21 PM I know :P 01-Apr-19 03:21 PM I have waited almost a year from when I started buying HV stuff to just pull a decent vacuum for the first time 01-Apr-19 03:22 PM unless of course you have all the right flanges I need and are willing to ship them to me for close to nothing 01-Apr-19 03:22 PM I had an SEM up and running before I made a chamber the other night LOL 01-Apr-19 03:22 PM (of-course thanks to adam :P) 01-Apr-19 03:22 PM heh... unfortunately I have no idea what type of stuff is needed for that gold crush stuff 01-Apr-19 03:22 PM thats weird 01-Apr-19 03:22 PM yep 01-Apr-19 03:22 PM panda and me were searching for it for ~1h 01-Apr-19 03:22 PM nothing 01-Apr-19 03:22 PM I've ordered some lead wire and hope that I can turn some adapters to KF 01-Apr-19 03:22 PM but I've only got one of the big end flanges, so I'll have go be creative with the other end 01-Apr-19 03:25 PM ah... hrm 01-Apr-19 03:25 PM yea I assume if you don't care about UHV and just want HV you could make semi KF stuff for it then adapt to standard stuff 01-Apr-19 03:26 PM that's my goal 01-Apr-19 03:26 PM I mean making a centering ring and a flat surface for an oring shouldn't be too bad 01-Apr-19 03:26 PM wish you a lot of luck with it! 01-Apr-19 03:26 PM thats an awesome chamber 01-Apr-19 03:26 PM thanks 01-Apr-19 03:26 PM the issue is simply that the diameter is too big for my lathe 01-Apr-19 03:27 PM I'm stuck hunting on ePay for conflat over here and throwing money away on copper gaskets... lol 01-Apr-19 03:27 PM oh... for the large flange opening I guess? 01-Apr-19 03:27 PM the smaller ones you should be-able to experiment with 01-Apr-19 03:27 PM Aye 02-Apr-19 09:24 AM yeah 03-Apr-19 10:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190403_190736-97A71.jpg 03-Apr-19 10:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190403_190723-E1817.jpg 03-Apr-19 10:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190403_190825-F080A.jpg 03-Apr-19 10:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190403_190837-1E019.jpg 03-Apr-19 10:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190403_190717-1ADF5.jpg 03-Apr-19 10:11 AM <0xDBFB7#9254> notches for each component 03-Apr-19 10:11 AM I love the attention to details 03-Apr-19 10:11 AM <0xDBFB7#9254> I guess the mech- and EE got along fine 03-Apr-19 10:11 AM oh yes 03-Apr-19 10:11 AM too bad the CZT is already missing 03-Apr-19 10:12 AM <0xDBFB7#9254> What material is that white stuff? 03-Apr-19 10:12 AM <0xDBFB7#9254> just a delrin support? 03-Apr-19 10:12 AM HDPE moderator 03-Apr-19 10:12 AM <0xDBFB7#9254> or something that goes ding when there's stuff 03-Apr-19 10:13 AM the whole device went ding when there is stuff 03-Apr-19 10:13 AM I need some detectors... 03-Apr-19 10:13 AM I have none atm... not that I have yet generated anything that needs detecting other than maybe Xrays out of the side of my SEM lol 03-Apr-19 10:14 AM there are still some of the He3 tubes left on ebay 03-Apr-19 10:15 AM oh? 03-Apr-19 10:16 AM https://www.ebay.com/sch/m.html?_odkw=&_ssn=vannadiy&_armrs=1&_osacat=0&_from=R40&_trksid=m570.l1313&_nkw=neutron&_sacat=0 03-Apr-19 10:16 AM or just get one of the exploranium PCBs like the one above 03-Apr-19 10:16 AM but I'm not sure about efficiency yet 03-Apr-19 10:18 AM Hrm ok 03-Apr-19 10:18 AM I am very ignorant in this field at the moment, like all those tubes are just... tubes to me at the moment heh... 03-Apr-19 10:18 AM what are those exploranium boards from? 03-Apr-19 10:19 AM https://www.youtube.com/watch?v=Da8nv6Ntv-I 03-Apr-19 10:19 AM ah I see 03-Apr-19 10:19 AM thats cool 03-Apr-19 10:21 AM https://www.ebay.com/itm/254174700874 03-Apr-19 10:22 AM oh very nice 03-Apr-19 10:22 AM that is extremely cheap 03-Apr-19 10:23 AM Aye 03-Apr-19 10:23 AM people are selling the sensors off that board for 2/3rds the cost LOL 03-Apr-19 10:23 AM might as-well get the whole board and see if you can hack it to utilize most of the circuitry 03-Apr-19 10:23 AM is there someone with the whole GR135 to do some probing to help us drive these boards or? 03-Apr-19 10:24 AM + I'd rather ruin the PMT myself instead of letting someone else do it while desoldering 03-Apr-19 10:25 AM yeaa... I mean I assume these boards were ones taken out of defective units and replaced to get them working again... 03-Apr-19 10:25 AM do these sensors have a lifespan? 03-Apr-19 10:25 AM do they burn out 03-Apr-19 10:25 AM I don't know anything about the technology behind them at the moment 03-Apr-19 10:26 AM a GM usually lives 10^10 pulses, the scintillator on the other hand 03-Apr-19 10:26 AM hm 03-Apr-19 10:26 AM well, detecting neutrons is done via a nuclear reaction, which releases a lot of energy and destroys the crystal 03-Apr-19 10:28 AM hrm 03-Apr-19 10:28 AM I would just imagine at that price they have been removed from defective units 03-Apr-19 10:28 AM what failed, is a mystery 03-Apr-19 10:30 AM yep 03-Apr-19 10:30 AM naw damn it 03-Apr-19 10:30 AM PMT lost many legs 03-Apr-19 10:30 AM just fell off 03-Apr-19 10:33 AM o... 03-Apr-19 10:33 AM they must have just been soldered on to the can 03-Apr-19 10:34 AM <0xDBFB7#9254> that's fine 03-Apr-19 10:34 AM <0xDBFB7#9254> now you just have a bunch of pin diodes 03-Apr-19 10:34 AM no 03-Apr-19 10:34 AM PMT 03-Apr-19 10:34 AM photomultiplier tube 03-Apr-19 10:34 AM and I was after the scintillator assembly 03-Apr-19 10:35 AM <0xDBFB7#9254> but the legs are pins right 03-Apr-19 10:35 AM <0xDBFB7#9254> i'm sorry 03-Apr-19 10:35 AM <0xDBFB7#9254> that was terrible 03-Apr-19 10:35 AM ohh it's punny 03-Apr-19 10:35 AM ahh 03-Apr-19 10:50 AM that broken PMT has got me really bummed out 03-Apr-19 10:50 AM and the GM is broken as well 03-Apr-19 11:23 AM yep the PMT has a leak => is dead 03-Apr-19 11:23 AM since it is glued to the scintillator that one is f*ed, too 03-Apr-19 11:26 AM <0xDBFB7#9254> :((( 03-Apr-19 11:26 AM <0xDBFB7#9254> ripmt 03-Apr-19 11:27 AM and GM 03-Apr-19 11:27 AM https://www.lndinc.com/products/geiger-mueller-tubes/71322/ 03-Apr-19 11:27 AM would have been that one 03-Apr-19 11:29 AM oh lmao 03-Apr-19 11:29 AM thats one of the companies that Adam suggested I ping to see if they had any extra beryllium windows for my EDS 03-Apr-19 11:30 AM there aren't too many manufacturers of stuff like that 03-Apr-19 11:30 AM but I think the Be windows from LND are too thick for eds 03-Apr-19 11:35 AM hrm ok 03-Apr-19 11:35 AM yea the ones for EDS have those super fine groves in them 03-Apr-19 11:35 AM to make them super thin in certain parts 03-Apr-19 11:43 AM oh, wow 03-Apr-19 11:43 AM the seller, who emphasises "no refunds" on the offer just sent another of those PCBs 03-Apr-19 11:45 AM Heh, maybe you sounded competent. 03-Apr-19 11:45 AM Or they paid by the pound for the cards, or they ware paid to take them away. 03-Apr-19 11:45 AM And at that price point others dont buy them to resell. 03-Apr-19 11:45 AM that may be 03-Apr-19 11:45 AM anyway, I'm happy now 03-Apr-19 11:45 AM until the second one arrives and is broken as well 03-Apr-19 11:48 AM Heh. 03-Apr-19 11:54 AM wait what? 03-Apr-19 11:54 AM so your getting a second of those detector boards? did your come broken in some way? 03-Apr-19 11:54 AM they are listed "for parts not working" which generally means, AS IS unless there is shipping damage 03-Apr-19 11:54 AM or is not as described 03-Apr-19 12:00 PM pretty sure it was shipping damage 03-Apr-19 12:00 PM it came in an envelope with one layer of bubble wrap around it 03-Apr-19 12:00 PM wooowww 03-Apr-19 12:00 PM wth... 03-Apr-19 12:01 PM yep 03-Apr-19 12:01 PM ussually I get stuff like that in a bubble wrap envelop then the item wrapped like 10 times with bubble wrap 03-Apr-19 12:01 PM because the envelope ships for the same price regardless of shape, if it fits it ships 03-Apr-19 12:01 PM so they ussually go ham 03-Apr-19 12:02 PM let's hope they packed it well this way 03-Apr-19 12:02 PM yea hopefully 05-Apr-19 07:48 PM Alumina rods! I wonder how much high voltage these can take when used to make a feedthrough? 05-Apr-19 07:48 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-3743A.jpg 06-Apr-19 09:00 AM ? s/rods/tubes 06-Apr-19 09:00 AM I was imagining using a rod without the center drilled out, wasnt working 06-Apr-19 12:25 PM @a_quiet_scientist voltage resistance of a feedthrough depends on a wide range of factors. Breakdown changes between ac, dc, and pulsed voltages. Pressure, electrode geometry and spacing to ground, triple point junctions, surface tracking, system it's used with (plasma, beam, etc) all contribute. 06-Apr-19 12:25 PM What's the application specifically? 06-Apr-19 12:25 PM For example, for something like a higher potential ebeam system, if you pass the beam through an insulator, if the ceramic isn't "shielded" from seeing the beam, charge can accumulate on the surface. Even if the breakdown strength and distance between anode and cathode are more than enough to hold off the potential, the surface can flash over due to charge accumulation. 06-Apr-19 12:25 PM This is an issue in particular that I have to deal with myself. This however is very different from using a ceramic insulator for something like a fusor stalk feedthrough. 06-Apr-19 03:06 PM Yeah fusor stalk feedthrough is exactly right 06-Apr-19 03:06 PM And yes my bad, it’s a tube not a rod 07-Apr-19 02:45 PM Got more stuffff 07-Apr-19 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1865-43D80.jpg 07-Apr-19 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1863-F141F.jpg 07-Apr-19 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1861-0780D.jpg 07-Apr-19 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1866-C7B32.jpg 07-Apr-19 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1864-7692C.jpg 07-Apr-19 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1862-8FD09.jpg 07-Apr-19 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1867-34F76.jpg 07-Apr-19 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1871-91256.jpg 07-Apr-19 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1868-D9B6C.jpg 07-Apr-19 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1870-B8190.jpg 07-Apr-19 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1869-1353C.jpg 07-Apr-19 02:48 PM that glass adapter looks like a standard bottle 07-Apr-19 02:48 PM It's not an adaptor. It's sealed! 07-Apr-19 02:48 PM just press a bottle cap onto it and it's sealed 07-Apr-19 02:48 PM It just goes down in the center a bit to a flat 07-Apr-19 02:48 PM It's... Weird... 07-Apr-19 02:49 PM oh, wth 07-Apr-19 02:49 PM Yeaaa a right? 07-Apr-19 02:49 PM I thought it was cool and it should be vacuum tight so it might be nice for magnetics and plasma and stuff 07-Apr-19 02:49 PM Dunno 07-Apr-19 02:49 PM Join in voice? 07-Apr-19 02:50 PM nah, I'm gonna go sleep in the next couple of minutes 07-Apr-19 02:50 PM gotta get back up in 7h and look like a functioning human all day long 07-Apr-19 02:51 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1872-CA165.jpg 07-Apr-19 02:52 PM those HP DACs look sweet 07-Apr-19 02:52 PM what input do they take? 07-Apr-19 02:52 PM gpib? 07-Apr-19 02:53 PM Yesss 07-Apr-19 02:53 PM They are fairly cheap on ePay it looks like but he had them and I have a soft spot for HPIB and HP equipment :) 07-Apr-19 02:54 PM nice 07-Apr-19 02:54 PM The little thing in the bottom right I'm excited about 07-Apr-19 02:54 PM well, have fun with them and good night 07-Apr-19 02:54 PM Little baby HV supply of some kind :) 07-Apr-19 02:54 PM Alright gnight! 07-Apr-19 02:54 PM Oh it's an ion controller! 07-Apr-19 02:58 PM I picked up this 4kV power supply yesterday for free, along with a lab oven (only goes up to 232C) 07-Apr-19 02:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/4kv_psu-57120.jpg 07-Apr-19 03:01 PM Oh wooowww... 07-Apr-19 03:01 PM Lucky! 07-Apr-19 03:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1873-B7789.jpg 07-Apr-19 03:21 PM @Conmega do you recognize or work with any of the names on this paper? http://diyhpl.us/~nmz787/pdf/Electrochemical_Characterization_of_Thin_Film_Electrodes_Toward_Developing_a_DNA_Transistor.pdf 07-Apr-19 03:25 PM Thats the watson center... so not really in my department persay... No names I know sadly though. 07-Apr-19 03:25 PM They may know me though lol 07-Apr-19 03:39 PM https://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1975-01.pdf 07-Apr-19 03:39 PM Wonderful HP test equipment HPIB pr0n^ 08-Apr-19 08:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0222-46C0E.jpg 08-Apr-19 08:33 AM May be liw quality photo, thabks phone 08-Apr-19 08:33 AM Low 08-Apr-19 08:33 AM Thanks 08-Apr-19 08:38 AM maybe wipe the lense? 08-Apr-19 09:35 AM It's more than just that.. But yeah.. 08-Apr-19 03:44 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1874-7F302.jpg 08-Apr-19 03:44 PM Woot got my foreline trap today too 08-Apr-19 03:44 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1875-0BC71.jpg 08-Apr-19 03:44 PM And the LDS order of course 08-Apr-19 04:00 PM hey, same trap! :D 08-Apr-19 04:06 PM yea @Applied_Ion recommended it to me I think 08-Apr-19 04:06 PM though I still have NO IDEA what the difference between this kind of trap and a "foreline trap" which is only a stainless steel wool thing... they are labeled differently in the LDS catalog... so like... they are considered to be different things... 08-Apr-19 04:06 PM I'd have to assume on a more sensitive setup you'd have... the steel wool at the pump to catch most stuff and let it drip back down? Then this up stream a bit to catch smaller stuff 08-Apr-19 04:06 PM but I'd likely have this right off the pump because... eh? 08-Apr-19 04:06 PM the material is cheap enough to just replace it a bunch 08-Apr-19 04:08 PM afaict the stainless steel foreline traps will catch oil and knock it back down into the pump, yeah. you put it right on top of the pump 08-Apr-19 04:08 PM in the case of the adsorbent trap that you have there with alumina or zeolite, you want that as close as possible to your vacuum system & valved on either side, if you can. it will trap oil, water vapor, contaminants, evil spirits.. basically anything that's getting pumped out through your system. it also provides a bit of intrinsic pumping capacity on its own, at least until its saturated (at which point it's about as useful as a stainless steel trap, but possibly worse bc it can outgas into your system) 08-Apr-19 04:08 PM in more strict circumstances you'd actually do initial roughing pumpdowns of your main chamber through a different, direct line to the forepump; then switch over to your high-vac pump + foreline trap to minimize the loading on the trap that happens from sucking tons of wet atmospheric air past it 08-Apr-19 04:12 PM ah ok cool cool 08-Apr-19 04:13 PM with that particular trap i've been trying to figure out ways to safely do in-situ regeneration without galling up the cap or otherwise busting stuff up.. i put some heater tape on it and occasionally hook it up to a variac and bring it to around 120-150C for several hours and it helps a Lot, even though full-on zeolite regen temperature is like 300-400C 08-Apr-19 04:14 PM how badly does it get filled with moisture from the air by sitting in atmosphere ? 08-Apr-19 04:14 PM also oh neat! 08-Apr-19 04:14 PM @Conmega thst is still a foreline trap lol, just one with replaceable fill 08-Apr-19 04:14 PM I need to get some heating wire... I have a small benchtop variac I should be-able to use for stuff like that 08-Apr-19 04:14 PM no no, @Applied_Ion they are not called foreline traps by LDS though, its funny 08-Apr-19 04:14 PM leme get a photo 08-Apr-19 04:14 PM admittedly i've never done proper measurements of, like, totally recharging some zeolite, weighing it, then letting it sit around and weighing it again 08-Apr-19 04:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1876-FDEF9.jpg 08-Apr-19 04:15 PM but for good effect i immediately sealed mine up when i first got it and then let it pump out for days. it had an alumina charge then, and at that point it dropped my lowest achievable foreline pressure from ~20-30 mtorr to 2-3 mtorr 08-Apr-19 04:16 PM oh wow nice 08-Apr-19 04:16 PM yea I just got my conflat stuff so once I get my chamber setup tonight and sealed and make sure it pumps down as it should I'll let it pump out for hours tonight 08-Apr-19 04:17 PM cool :D 08-Apr-19 04:18 PM but yea, molecular sieve trap this is considered in LDS land aparently 08-Apr-19 04:18 PM not "foreline" because they have foreline, foreline refillable, then molecular sieve 08-Apr-19 04:18 PM Eh, it's still a foreline trap by definition lol 08-Apr-19 04:19 PM ^ 08-Apr-19 04:19 PM fair enough, so ok, I'll put it off the turbo... I have some valving I'd like to do chamber roughing then switch over to the turbo, but at the moment I've just been slowly starting a pump through the turbo then doing that... because... its a 4 way 2.75" Conflat chamber atm 08-Apr-19 04:19 PM its so small its just like... er yea... 08-Apr-19 04:19 PM I do have CF 2.75" pneumatic valves, and a KF25 pneumatic valuve, and the manual KF 25 valve I use on the roughing pump atm 08-Apr-19 04:19 PM once I do up the SEM with its new pneumatics I should have extra valves left over and I can start working on my valving for my vacuum chamber stuff 10-Apr-19 11:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190410_154204-A9E10.jpg 10-Apr-19 11:22 AM So we took a delivery of these at work 10-Apr-19 11:22 AM Kainda mad to look at a shelf with 18pcs of turbos. 10-Apr-19 11:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190410_154153_-_Copy-0F8A2.jpg 10-Apr-19 11:22 AM And 20pcs of KF40 solenoid valves and prepumps. 10-Apr-19 11:22 AM :D 10-Apr-19 11:52 AM do you really need all of those? 10-Apr-19 01:21 PM jeeezzz 10-Apr-19 02:11 PM A dude from the local pheiffer shoppe hand delivered them 10-Apr-19 02:11 PM tbh that is like +100k€ worth of turbo, so not terribly out of place. 10-Apr-19 02:11 PM I'm still eying the Agilent pumpstation at the back of one of the lab shelves lustfully. 10-Apr-19 02:11 PM Such nice self contained, backpack sized unit. 10-Apr-19 02:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190320_185533-D996F.jpg 10-Apr-19 02:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190320_185638-DF813.jpg 10-Apr-19 02:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190320_185628-D338C.jpg 10-Apr-19 02:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190320_185600-1DB71.jpg 10-Apr-19 02:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190320_185553-8E80C.jpg 10-Apr-19 02:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190320_185646-FA786.jpg 10-Apr-19 02:11 PM Worst part is that I have never seen it used. 10-Apr-19 05:43 PM Would be interesting to bake it out and plot the weight gain of a bucket of zeolite 10-Apr-19 05:43 PM I want it 11-Apr-19 09:35 AM Boards are in for the first prototype thruster build! 11-Apr-19 09:35 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_on0kno-82FCF.jpg 11-Apr-19 09:36 AM Wooott! 11-Apr-19 10:21 AM wows 11-Apr-19 03:46 PM Cool 11-Apr-19 03:46 PM All built from FR-4 PCB material? 11-Apr-19 03:58 PM Yeah. I can't afford to prototype on more high vacuum suitable stuff like Rogers or Teflon lol. The purple and gold looks pretty cool anyway, and they got a big community around them. 11-Apr-19 04:49 PM Yep 11-Apr-19 04:49 PM All of my pcb's that have gone to vacuum chambers had the absolute minimum of pcb material and no soldermask 11-Apr-19 04:49 PM With the idea being to minimise the amount of out gassing FR-4 and volatile material in general. 11-Apr-19 04:55 PM I think FR4 will be fine to the levels I am going to, I only need 10^-6 torr at most. It will definitely outgas for sure, hopefully though my high pumping speed should compensate 11-Apr-19 04:55 PM I don't have much choice at this point anyway lol, it's either it works or it doesn't now 11-Apr-19 04:59 PM Yeah FR-4 very much works at that pressure level. 11-Apr-19 05:01 PM actually I wonder if it would help to cover the edges of the boards with something, I'd assume most of the outgassing would come from the edges 11-Apr-19 05:13 PM Outgassing comes from the bulk material. Gas just leaches out of everywhere lol 11-Apr-19 05:13 PM Anywhere there is a surface, there will be some gas load associated with it 11-Apr-19 05:13 PM That's why outgassing rates are seen as something like torr-l/s/cm^2 12-Apr-19 12:39 PM Fingerstock soldered to the pcb sockets: 12-Apr-19 12:39 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_btyfpl-8C7FD.jpg 12-Apr-19 12:39 PM Fit of the thruster electrodes into the boards before assembly: 12-Apr-19 12:39 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_ax09ba-A0E5D.jpg 12-Apr-19 12:39 PM I actually finished the thruster assembly last night, but I am posting each step one at a time for now. Gotta disassemble it after taking pics of the completed thruster to add power wires and the pulse cap for testing, but I'm about 1 week from testing my full high vacuum, cooling system, and first thruster for the first time. 12-Apr-19 02:40 PM nice 12-Apr-19 05:11 PM Also started construction on the flat gridded PPT today, will have updates on that build next week as well. I unfortunately procrastinated for a couple weeks on the last parts I needed from digikey, and now I'm paying for it delaying testing lol. Could have had the thruster finished and mounted in the chamber this weekend if I didn't take so long ordering the capacitors... 13-Apr-19 09:42 AM Thruster electrode subassembly complete: 13-Apr-19 09:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/AIS-uPPT1_Micro_Pulsed_Plasma_Thruster_Ass-76B2F.jpg 13-Apr-19 09:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/AIS-uPPT1_Micro_Pulsed_Plasma_Thruster_Ass-97280.jpg 13-Apr-19 09:42 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/AIS-uPPT1_Micro_Pulsed_Plasma_Thruster_Ass-B4586.jpg 13-Apr-19 09:44 AM Looking good! 13-Apr-19 09:53 AM Thanks! 13-Apr-19 11:00 AM Looks awesome! 13-Apr-19 08:09 PM My stuff looks so sloppy by comparison 13-Apr-19 08:09 PM It looks great! Can’t wait to get construction details 13-Apr-19 08:09 PM Brazed fusor grid together from 1mm W wire (anneal it before winding so it’s less brittle, and anneal again after you’ve work hardened it) and brazed on M3 allthread stem (304 SS), removed flux and oxide with hot NaOH followed by HCl, then steel wool then acetone, bonded it inside alumina tube with Hysol 1C and sealed the edge, drilled the conflat blank and sealed the alumina tube in with Hysol. I think it came out kind of okay for my first try 13-Apr-19 08:09 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-56EDA.jpg 13-Apr-19 08:09 PM Yeah I know no gloves, will clean the flange with methanol later 13-Apr-19 08:09 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-C1695.jpg 13-Apr-19 08:36 PM Thefusor stuff tends to clean itself as well 13-Apr-19 08:58 PM Maybe put O2 into it first for a good oxygen plasma bath 14-Apr-19 02:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-12CC8.jpg 14-Apr-19 04:22 PM washed out pic, and the milling attachment still needs to be cleaned up, but at least it is on (but not yet wired back up, just 4 wires to recrimp).. but there is some glory in there.. 14-Apr-19 04:22 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0241-3DBAC.jpg 14-Apr-19 04:22 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0239-4A1FD.jpg 14-Apr-19 04:22 PM also, a pic of everything including a full view of the stand makes it more impressive 14-Apr-19 04:22 PM needs a bit more work before I throw production/etc at it.. but I could think I can make y'all some copper gaskets for cheap, maybe just cost of material + shipping untill I really get the hang (and lack of time?) of the thing 14-Apr-19 04:22 PM I need to tool-up a bit more 14-Apr-19 04:22 PM only one general purpose tool holder, and a parting tool holder came with it (Dorian/Aloris AXA style holder) 14-Apr-19 04:22 PM oh, DRO is also near the top of the list - but I really want to try my sony magnescale knockoff over buying some glass-slide version 14-Apr-19 04:22 PM sucks it is an inch machine 14-Apr-19 04:22 PM you can see the alcatel roughing pump (and behind it the turbo) in the background 14-Apr-19 07:10 PM @a_quiet_scientist I strongly recommend against running an oxogen plasma unless you know what you are getting into. Without the right pumps and oils it's crazy dangerous. 14-Apr-19 07:10 PM Like roughing pump blowing in half. 15-Apr-19 05:57 AM Halp! I has leak! Colorful vacuum coating dirt. I got a spectrograph and am putting in some quartz windows. 15-Apr-19 05:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190414_191440818-4BCF2.jpg 15-Apr-19 05:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190414_191630468-EBCB3.jpg 15-Apr-19 07:27 AM @a_quiet_scientist @AdamMcCombs oxygen risks. If you want to get a bit of O2 in there for plasma cleaning then just use a bit of air. Everyone agrees air is "safe", tho after reading up on oxygen safety I'm starting to think that is a combination of being to blase about air and a lack of scientific understanding of why pure O2 at pressure causes the problems it does. The basic theory is that what matters is the partial pressure of O2, but if that were really true then air at 5 bar would be just as bad as pure O2 at atmospheric pressure, which is empirically not so. But you are not going to get enough 02 inside your pump to cause an explosion unless you do something like fill your chamber with O2 at atmospheric and then pump down. This is just way way more O2 than you need for a plasma process. I think a big reason for using the inert pump fluids in oxygen processing is that the oil breaks down, tho once again, if there is a high fraction of inert gas to carry the O2 thru then you should be ok. I am using a 5sccm MFC for air feed and this is more than enough in an argon mix. In American cooking units that's a teaspoon of air a minute. 15-Apr-19 07:45 AM My understanding is that it's similar to the way gas ballast works. Non inert oil that breaks down under an oxogen atmosphere itself becomes extremely flammable/explosive, so over time the risk associated with it goes up. 15-Apr-19 08:13 AM Yeah its only leaking the tiniest leak of oxygen into the vacuum but point well taken, and it’s just not really necessary 15-Apr-19 08:13 AM Nitrogen plasma does a good job scrubbing as well 15-Apr-19 08:19 AM Now I wonder what backing pump oil they are running in the plasmaLab ... we routinely run 30 sccm oxygen in it for hours, SF6 RIE, boron trichloride, all sorts of stuff. The pump oil must get so hammered. 15-Apr-19 08:19 AM You just have to use fomblin oil 15-Apr-19 08:19 AM It's outrageously expensive, but works great 15-Apr-19 08:20 AM It’s like Galden / Fluorinert right? 15-Apr-19 08:20 AM I get to use the Nova FEGSEM tomorrow ^_^ 15-Apr-19 08:22 AM It has a significantly lower vapor pressure 15-Apr-19 08:22 AM What are you getting to run on the Nova? 15-Apr-19 08:25 AM Just pictures of small liftoff devices. It’s overkill but the guy responsible for the little Hitachi SEM is away so I asked for an induction in this lab, I’ve not used it before but it looks really nice 15-Apr-19 08:28 AM I like the GUI on the FEI stuff better than the modern Hitachis I have been on. The Nova uhr optics are pretty damn nice as well 15-Apr-19 08:28 AM I really want an imersion optics instrument for my shop... 15-Apr-19 08:44 AM Oxogen is terrifying 15-Apr-19 09:15 AM Totally didn't just get a medical grade O2 cylinder from a friend which appears to be full 15-Apr-19 09:15 AM totally don't need just one more cryo hose to get a cryo compressor and cold head running which will allow me to create liquid oxygen 15-Apr-19 03:41 PM What I was sayin' is that there are real risks from oxygen, but keep it in perspective. If you are cleaning with solvents then that is a big fire/explosion risk too. We are often careless about that stuff, but the oxygen stuff is a bit more exotic or something. 15-Apr-19 03:44 PM Oh yeah, the reason I bring it up when discussed is that the challenges faced in the pump when working with oxygen are not as obvious as other risks we face on a regular basis. Its just something else you have to think about/design around once aware of the problem. 15-Apr-19 05:08 PM The fomblin seems like useful interesting material. More an oil unlike krytox grease, but still low vapor pressure whilst being more liquid, lower molecular weight but not as low as fluorinert etc 15-Apr-19 05:17 PM It’s coming together gradually... 15-Apr-19 05:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-D9745.jpg 15-Apr-19 05:17 PM I didn’t even know you could braze tungsten but it works well 15-Apr-19 05:17 PM Like all such things... clean it thoroughly, get oxide off, use the right flux generously, and get it hot. 15-Apr-19 05:17 PM I’m really loving my jewellery maker’s silver solder too... hard Ag solder in a really fine wire unlike big ugly HVAC plumbing rods 16-Apr-19 10:43 AM Well, here is the final assembly of the first prototype concept PPT. Next steps will be attaching wires, mounting it to the high vacuum feedthrough, and prepping for high vacuum tests. 16-Apr-19 10:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/AIS-uPPT1_Micro_Pulsed_Plasma_Thruster_FIN-4E14A.jpg 16-Apr-19 10:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/AIS-uPPT1_Micro_Pulsed_Plasma_Thruster_FIN-CFA3A.jpg 16-Apr-19 10:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/AIS-uPPT1_Micro_Pulsed_Plasma_Thruster_FIN-93FA6.jpg 16-Apr-19 11:28 AM nice 17-Apr-19 06:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190417_103808-CD536.jpg 17-Apr-19 06:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190417_103801-BA0D5.jpg 17-Apr-19 06:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190415_091112-9BD34.jpg 17-Apr-19 06:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190417_103813-F2FCA.jpg 17-Apr-19 06:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190417_103818-C51B8.jpg 17-Apr-19 06:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190415_091102-FA262.jpg 17-Apr-19 06:24 AM the inner workings of a high purity germanium detector! 17-Apr-19 06:24 AM when I say high purity I really mean it, that ingot is like 99.99999999% 17-Apr-19 06:24 AM the whole thing is cooled down do LN2 temps to get its resistance high and noise low enough 17-Apr-19 06:24 AM once that temp is achieved you apply 2-5 kV on the contacts of the Ge and watch the magic happen, as ionizing radiation strikes the crystal, releases holes / electrons that drift to their respective electrode and are collected 17-Apr-19 06:24 AM that little jfet on pic #2 functions as a charge amplifier, in conjunction with the resistor and capacitor below it 17-Apr-19 06:24 AM the whole this is used for photon spectroscopy in the range of ~10 keV to a couple of MeV 17-Apr-19 07:51 AM I do not know the beginning of the conversation but I heard brazing and gas scrubbing in the same few posts. I am confused about oxygen being used as a cleaning agent. Generally we would either hydrogen fire or vacuum fire to clean parts to braze. Sorry if I am confused or crossing subjects. 17-Apr-19 04:43 PM That was referring to oxygen plasma cleaning 17-Apr-19 04:43 PM When you look at a 4” wafer of Ge 0.5mm thick and it’s like USD$200 it’s amazing how big the slug in a HPGe is 17-Apr-19 10:35 PM well, it was Something like $20k 17-Apr-19 10:35 PM Solid state radiation detectors hurt the physics part of my head! Hahahaha. I have always wanted to try peeling the can off a TO3 and bring the base potential up while exposing it to a radiation source to se when it starts pinging. 17-Apr-19 10:40 PM not base potential, you want a reverse biased diode junction for stuff like that :) 17-Apr-19 10:40 PM most preferably a PIN junction, the I region is active 18-Apr-19 01:24 AM I have seen detectors done with the good old BPW34 PIN-diode 18-Apr-19 02:49 AM that... works 18-Apr-19 02:49 AM but that's about it 18-Apr-19 02:49 AM the diode is way too small to have any reasonable efficiency 18-Apr-19 03:43 AM bit with pin diodes you can do alpha spectroscopy! 18-Apr-19 03:43 AM if you dissolve the plastic ontop of the sensor 18-Apr-19 04:35 AM That sounds like a fun project 18-Apr-19 07:24 AM Aye! 18-Apr-19 01:29 PM I was working on an xray dosimeter based on the jameco geiger photodiode kit https://www.jameco.com/z/CJKIT-20255-Pocket-Photodiode-Geiger-Counter_2170812.html 18-Apr-19 01:29 PM got stuck with choosing amplification needed, and testing inside a FIB with a piece of molybdenum was a bit tedious as a test apparatus 19-Apr-19 12:20 AM Amptek is like “our charge sensitive preamplifier works on Mars” 19-Apr-19 12:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-7D3E9.jpg 19-Apr-19 12:20 AM Finally a “grown up” proper detector amplifier 19-Apr-19 12:23 AM oah, want! 19-Apr-19 12:23 AM where did you get that from? 19-Apr-19 12:25 AM I couldn’t say but if it works I’ll be lucky and very happy 19-Apr-19 12:27 AM oh yes, that chip's pornographic! 19-Apr-19 12:27 AM what fet are you going to use with it? 19-Apr-19 12:27 AM oh wow, guess that's a once in a life time chance 19-Apr-19 12:29 AM Found some old junk cleaning up detector electronics in a lab and asked if I could keep it. But if I put it into a working board and it works my supervisor may want it back 19-Apr-19 12:29 AM Not sure where it was purchased, maybe Amptek directly 19-Apr-19 12:29 AM Might try it with the Russian neutron tube 19-Apr-19 12:31 AM that's a totally different regime 19-Apr-19 12:31 AM what you've got there is an amplifier (without the front end fet) for stuff like high purity germanium detectors, stuff in the femtocoulomb range 19-Apr-19 12:32 AM I think the external FET is nice both for cryogenic applications like HPGe and also because damage is likely to just hit the cheap replaceable FET and not the main chip 19-Apr-19 12:33 AM but neutron detectors are dozends of picocoulombs 19-Apr-19 12:33 AM Might be good for our micro channel plate ion detector 19-Apr-19 12:34 AM honestly you don't need a fet frontend for the russian corona tubes, as you's want to terminate them into a couple of kohms anyway 19-Apr-19 12:34 AM aye, that's a worthy use for the chip 19-Apr-19 12:34 AM If I ever get a HPGe it will be nice 19-Apr-19 12:36 AM ask labs that could have one, explain your situation, play he role of the interested but poor student 19-Apr-19 12:36 AM those things are thrown out more often than you might think 19-Apr-19 12:37 AM Probably just a blown FET 19-Apr-19 12:38 AM nah, in perfect health, just buying new ones etc 19-Apr-19 12:40 AM If you want to score great stuff hang around with research biologists. They increasingly depend on high tech tools like protein mass spec and MALDI, with things like high voltage, lasers and high vacuum. They usually just buy devices, without any skills in repurposing, hacking or repairing, and they are usually well funded labs since everyone loves the idea of curing cancer even if they don’t understand fundamental physics research 19-Apr-19 12:40 AM And that means lots of neat stuff gets scrapped 19-Apr-19 12:41 AM hehehe 19-Apr-19 12:41 AM and governement agencies, as they throw 99% of their stuff in the trash instead of selling it, it's a legal thing 19-Apr-19 12:42 AM I wish I got to visit the Black Hole at Los Alamos before Ed died. I wonder if all his stuff just went in the trash? 19-Apr-19 12:43 AM I wonder that, too 19-Apr-19 12:43 AM a store like this is pretty much a childhood dream of mine 19-Apr-19 01:03 AM I once worked at an electronics store that could have become something like this 19-Apr-19 01:03 AM at least a top surplus store for electronics, measuring equipment and stuff like that 19-Apr-19 01:03 AM but the boss would rather have those things rot in storage than sell them below their new price 19-Apr-19 03:51 AM :/ 20-Apr-19 12:47 PM @Charles It depends on what you are removing from what. Some oxygen in the plasma is great for oxidizing organic gunk (and removing it as CO2 or water). For getting a non-oxidized surface on metal you do want H2. But in much vacuum work an oxidized aluminum or stainless surface is considered "clean". 20-Apr-19 03:48 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2084-76EC1.jpg 20-Apr-19 03:48 PM God I love the surplus store. 20-Apr-19 03:48 PM Damn 20-Apr-19 03:48 PM Looking good 20-Apr-19 03:48 PM Cryo sem time 20-Apr-19 08:21 PM @robamacl for vacuum tubes and such we typically degrease, then wash in a detergent and rinse, then final dip in methanol to remove any remaining undiluted water, then dry hydrogen fire to remove oxides. You can get pure nickel so clean that it will cold weld together at 900C that way. It’s sometimes a problem actually when I use ultra pure nickel. I have to carefully peel things apart! 20-Apr-19 08:55 PM Some of them are ok looking, some are pretty beat... 20-Apr-19 08:55 PM But for 10 bucks a piece... 20-Apr-19 08:55 PM there was one that the end was like... rusty as all heck... did not want that one 21-Apr-19 10:16 AM Helium cold head time? 21-Apr-19 03:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2104-AFBFC.jpg 21-Apr-19 03:17 PM Labware gotten at the flea 22-Apr-19 06:13 AM I added some quartz windows to my chamber. First I used JB weld to glue in some kf25 "long weld stubs". 22-Apr-19 06:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190420_160249387-0D47B.jpg 22-Apr-19 06:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190414_191440818-A25E2.jpg 22-Apr-19 06:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190420_155633432-AFD80.jpg 22-Apr-19 06:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190414_191836943-F9A47.jpg 22-Apr-19 06:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190414_191254474-DF928.jpg 22-Apr-19 06:13 AM Then I glued 1" quartz window into a "bored flange" using silicone. I wanted a flexible glue to avoid stresses from thermal mismatch. Cleaning off the excess glue is a bit of a pain. You rub scape and tear it off using fingernail and other blunt instruments. This comes in at under $20 a window. I wanted quartz because I'm starting to mess with spectroscopy. 22-Apr-19 06:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190421_083558078-8B333.jpg 22-Apr-19 06:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190420_160500404-9FB34.jpg 22-Apr-19 06:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190420_160713388-C3A4F.jpg 22-Apr-19 06:13 AM I'm feeling much better! 22-Apr-19 06:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190421_1954529052-10402.jpg 22-Apr-19 06:48 AM It seems to help work rubbing off the silicone if you keep it wet with water or alcohol. 22-Apr-19 07:26 AM Nice 22-Apr-19 07:26 AM Is that a pressure cooker? 22-Apr-19 07:26 AM @GigaSquirrel I heard you like lasers, here’s a pic of some lasers in the spare lasers pile 22-Apr-19 07:26 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-AE96B.jpg 22-Apr-19 07:26 AM 1.5” OLED colour screen 128x128 plus a micro controller, 12V in, and RS232 translated serial out to the gauge. The board sits behind the glass OLED display. Like a DIY version of the fancy vacuum gauges 22-Apr-19 07:26 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-7FE1D.jpg 22-Apr-19 07:26 AM I will use this with my 901ps but you could use it with any RS232 device 22-Apr-19 07:26 AM Still very rough not finished layout yet 22-Apr-19 07:26 AM Here’s a similar design to illustrate 22-Apr-19 07:26 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-6C249.png 22-Apr-19 10:15 AM @a_quiet_scientist very nice, what lasers are those? 22-Apr-19 12:00 PM @a_quiet_scientist nah, just a commercial aluminum stock pot. 22-Apr-19 03:42 PM @GigaSquirrel mostly Nd:YAG Q-switched, some with nonlinear optics downstream, a couple of nitrogen lasers. I think there is also a Ti:Sapphire and a dye laser somewhere. Couple of small HeNe for alignment 22-Apr-19 03:42 PM @robamacl nice plasma stock pot! Did you just weld a plate on the top? 22-Apr-19 11:17 PM got the Pfeiffer Vacuum 'Vacuum Technology' box set in the mail free using their request form on their website 23-Apr-19 05:08 AM @a_quiet_scientist it's a bell jar. The pic is upside down to make it look more like a face. 01-May-19 12:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190501_205958-7E300.jpg 01-May-19 12:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190501_2059472-F1328.jpg 01-May-19 12:02 PM since I can really need some neutrons right about now I built the absolut minimum fusor 01-May-19 12:02 PM still needs a grid and actual deuterium 01-May-19 12:02 PM and my power supply only does 30 kV 01-May-19 12:02 PM but hopes are high 01-May-19 02:17 PM Heh nice! 01-May-19 02:18 PM I wonder if I'll actually get any from it 01-May-19 02:18 PM but there's only one way to find out ^^ 03-May-19 09:15 AM Nice! How much current does your 30kv supply put out? 03-May-19 09:15 AM It's also -30kv right? 03-May-19 09:41 AM -30 kV @ 100 mA 03-May-19 09:41 AM but I'd happily switch for a higher voltage lower current one 03-May-19 09:41 AM or well lower voltage :D 03-May-19 09:48 AM That's just a wee bit of power 03-May-19 09:48 AM that's a hell of a power supply 03-May-19 09:50 AM Yep 03-May-19 09:50 AM but afaik the current doesn't help much with fusion 03-May-19 09:50 AM fusion yield should be linear with current amd very much exponential with voltage 03-May-19 10:42 AM It depends. For equivalent voltage, higher current will yield higher neutron numbers. More never hurts lol 03-May-19 10:42 AM DPFs operate at like 20kv, but deliver up to 100s of kA for way higher yields than fusors for the same total input power. Different device, but still fusion reaction. BoT stuff also benefits significantly with current. More current = more deuterons to interact with 03-May-19 10:42 AM Higher voltage is better first to a point, but I think current helps push equivalent devices to the next tier of neutron yields. 03-May-19 10:42 AM 100mA is a real beefy supply for dc lol 03-May-19 10:42 AM At that voltage 03-May-19 10:42 AM I think normally people running at 30kv get in the 10^5 n/s range at some tens of mA. 03-May-19 11:00 AM Powaah 03-May-19 11:00 AM I see "dpf" and all I can think is diesel particulate filter 03-May-19 11:09 AM Lol. I think it's also a practicality issue as well. It's hard to get 100kv at something even like 100mA dc. 100kv at 10A or even 100A pulsed is pretty trivial. Hence why commercial sources are usually pulsed for decent yields. 03-May-19 11:09 AM Looking forward to seeing what yields you get with your supply though! 03-May-19 11:09 AM I think if you condition it well and run it a bunch of times, you may be able to push into 10^6 territory, not sure though. Few people run at those high currents lol 03-May-19 11:09 AM When are you anticipating to run? 03-May-19 11:22 AM next couple of weeks, uni takes a lot of time atm 03-May-19 11:22 AM maybe I'll make a grid tomorrow and do some air runs 03-May-19 11:22 AM still neee to set up the electrolysis stuff 03-May-19 11:22 AM I think thermals might be a Problem, the main chamber is just a kf40 cross 03-May-19 11:22 AM air cool it or sth 03-May-19 12:40 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-05-03_21-40-24-54EB3.jpg 03-May-19 12:40 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-05-03_21-40-23-E8CC6.jpg 03-May-19 12:40 PM what is this, a package for ants? 03-May-19 12:56 PM wellp I just ordered soldering tips that look like subcutaneous needles 03-May-19 01:38 PM What? Why? I could solder those down with a chisle tip 03-May-19 01:38 PM So can I 03-May-19 01:38 PM so long as there is a good solder mask on the board and you use flux... I mean... 03-May-19 01:38 PM but I want the pins to be electrically separated 03-May-19 01:38 PM uhm, I mean the real option is to get a hot air gun and solder paste 03-May-19 01:38 PM not smaller tips 03-May-19 01:39 PM opinions on cheap hot air guns? 03-May-19 01:42 PM I have one of these Chinese 858D units: https://www.ebay.com/itm/858D-SMD-Hot-Air-Rework-Heat-Station-Hot-Blower-Hot-Air-Gun-LED-3-Nozzles/201700878924 03-May-19 01:42 PM I got it from Scotty from Strange Parts at HOPE. It survived the abuse of a bunch of people using it for a whole weekend and me using it on and off for months, randomly for de-soldering and heatshrinking stuff and such. 03-May-19 01:42 PM I'd get a pack of nozzles for it so you have more variety and some smaller output ones. 03-May-19 01:42 PM But yea variable temp/air speed, fan is in the handle so no big hose pushing the air through to the handle. And its got a magnet in the holder (that picture shows the thing in there upsidedown) so when you set it down it starts a cooldown sequence 03-May-19 01:42 PM though the reedswitch is in a particular spot so you need to make sure you kinda set it down right. 03-May-19 01:42 PM Hope that helps 03-May-19 01:45 PM Thanks! 03-May-19 01:48 PM Np :) I mean these things got decent enough and are so cheap its like, worth having if your going to do surface-mount 03-May-19 01:51 PM 30 bucks is not too much of an investment 03-May-19 04:18 PM I have tried one of that style stations and it worked suprisingly well considering how much it cost. 03-May-19 04:18 PM I have a larger thing myself and somthing similar at work, but for casual use that thing is perfectly ok 03-May-19 04:18 PM the only "gotcha" is that most dont have too much logic, so to shut it down one puts the hot air gun on the holder and allows the station to ramp the temperature down, before powering it off. 03-May-19 04:18 PM Compared to better stations where you cannot turn it off before it has cooled down. 03-May-19 05:49 PM I have an Atten 858? like that. The expensive Metcal one at work is better but the 858 is cheap and does the job ok! 04-May-19 08:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-05-04_17-06-50_2-D7A1E.jpg 04-May-19 08:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-05-04_17-06-50-5FA89.jpg 04-May-19 08:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-05-04_17-06-49-E213D.jpg 04-May-19 08:07 AM got a cheap BNC feedthrough vacuum tight! 04-May-19 11:30 AM nice 05-May-19 03:12 AM now I can get proton spectra out of the fusor 05-May-19 03:12 AM once if it works 05-May-19 03:41 AM yay 05-May-19 04:34 AM https://twitter.com/GigaBecquerel/status/1125000494555049984 05-May-19 06:59 AM haha, wow 05-May-19 06:59 AM I think the ceramic I am using as an insulator on the vacuum side is a bit porous 05-May-19 06:59 AM I am at 1 mbar at the moment, pressure is slowly dropping 05-May-19 06:59 AM slooowly 05-May-19 06:59 AM and there is no leak 05-May-19 06:59 AM oh and the gauge is at the worst possible position 05-May-19 04:20 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-6CAD7.jpg 05-May-19 04:20 PM This is my small tube exhaust stations. I maintained several of these at MU incorporated before they closed. They are a CVC MCF60 diffusion pump and a Welch 1400. They made 1Z2’s 2c53’s 7234 and 7235’s on these stations. Hand lever ball valves all around and silver soldered copper manifold with o ring compression ports for the glass tubes. I seal off the upper end of the -6 scale which is about all this kind of pump is good for, but that’s way way lower the. Carousel exhausted tubes. 05-May-19 04:20 PM I purchased this one and a larger station to replace my tiny one at home when we closed the factory 05-May-19 04:20 PM The Lepel I use for flashing getters. 05-May-19 04:20 PM Setups like this were very common for small firms to exhaust specialty tubes. I have about a 90 to 120 minute cycle time, mostly waiting for the bake out oven. 06-May-19 03:30 AM Very cool 06-May-19 07:51 PM FLIR Lepton Raspberry Pi bonnet 06-May-19 07:51 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-A47FF.jpg 07-May-19 05:54 AM Whoop whooop 07-May-19 05:54 AM electroplating copper onto copper paint works! 07-May-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-05-07_14-53-42-4E8D5.jpg 07-May-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-05-07_14-53-45-501BB.jpg 07-May-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-05-07_14-53-49-AA897.jpg 07-May-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-05-07_14-53-50-3A168.jpg 07-May-19 07:06 AM https://patents.google.com/patent/US2214646 This jogged a memory. They used to make things conductive with silver deposition then plated on that. Paint is also covered in this patent. If you look closely you will see this is from the Metaplast Corporation which is famous only because Richard Feynman worked there pre war. The key was a good bond with the base. In the case of wood it’s no problem as long as things stay dry and clean. For plastic however they problem was creating a suitable surface with grip without depolymerizing it, or at least re stabilizing it afterwards. 07-May-19 08:08 AM Whatttt thats cool, so is that copper paint on a 3D print then copper plating ontop of that? 07-May-19 08:09 AM yep, the copper paint works like any spray paint 07-May-19 08:09 AM but it is non conductive 07-May-19 08:09 AM I don't know how electroplating non conductive paint works, but hey, here I am 07-May-19 08:09 AM now I can print custom enclosures and they can shield the stuff inside! 07-May-19 08:12 AM yea that's awesome 07-May-19 08:12 AM I'd just assume its "not conductive, over a distance, but as you plate stuff near your connection it spreads out and gets conductive, so you'll likely have a thicker plating near where your starting electrode was, but yea not a big deal for something like this 07-May-19 08:15 AM might be something like that 07-May-19 08:15 AM I have no idea about chemistry 07-May-19 09:25 AM Well that's pretty awesome 07-May-19 10:35 PM @GigaSquirrel what do you mean by non conductivite? Aw we talking giga ohm range or? 07-May-19 10:37 PM @GigaSquirrel how do you connect an electrode onto the non conductive paint? 07-May-19 10:37 PM https://antennatestlab.com/3dprinting 07-May-19 10:37 PM Reminds me of that 08-May-19 12:29 PM Well, most of the regulars here will have already seen my testing updates from the past few days. Pretty significant electronics failures during thruster testing but here is a picture of the only captured ignition I got on camera. 08-May-19 12:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/First_Ignition_Test_-_05-07-2019-CBEF7.jpg 08-May-19 12:29 PM It's a small step forward, but I've got a lot of redesign to do for the vacuum connections and thruster mounting lol. Arcing issues were unexpectedly bad 08-May-19 01:02 PM Pretty 09-May-19 07:28 AM I’m very happily surprised by the good condition of this second hand HiPace 80 - looks practically brand new! Still has the original Pfeiffer plastic covers and everything. Really shouldn’t spin it up in atmosphere but maybe just a second 09-May-19 07:28 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-FD211.jpg 09-May-19 07:30 AM shiny! 09-May-19 07:30 AM a quick spinup in atmosphere doesn't really hurt 09-May-19 09:13 AM Yea I just wouldn't allow to get close to full speed, like apply power, take it off like a second or two later 09-May-19 09:13 AM but if the bearings allow you to rotate the body and the blades stay almost perfectly still... Your probably fine. 09-May-19 04:25 PM It spins! But only slowly for a second then I turned it off 09-May-19 05:54 PM Awesome. 09-May-19 05:54 PM If you cannot come across the manuls for it I have paper copies of those for HiPace 80, we use them at work. 10-May-19 08:22 AM Manuals for it are easy to google but thank you 10-May-19 01:17 PM That’s pretty nice looking there 11-May-19 03:24 AM The outside diameter is 130mm at the flange which I believe is ISO-K 100, not the ISO-K 63 that the manual claims 11-May-19 03:24 AM That’s OK though 11-May-19 03:24 AM I ordered a centring ring with a mesh because I probably can’t be trusted 11-May-19 10:50 AM woohoo, I can now get a good quality surface finish when copper coating 11-May-19 10:50 AM and it sticks to pretty much anything, this is a piece of graphite 11-May-19 10:50 AM (pics are coming) 11-May-19 10:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190511_192047-E91F5.jpg 11-May-19 10:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190511_191903-AB8AE.jpg 11-May-19 10:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190511_192014-F1516.jpg 12-May-19 03:37 AM Nice 12-May-19 04:37 AM and everything's perfectly solderable 13-May-19 01:26 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Schaltplan-09A24.PNG 13-May-19 01:26 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Layout-457BE.PNG 13-May-19 01:26 AM A neat little Charge sensitive amplifier for all kinds of detectors 13-May-19 01:26 AM this is the first working prototype, which gave me ~ 200 mV/ pC 13-May-19 01:26 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190512_235034-9FBBD.jpg 13-May-19 01:42 AM whatcha using it for? 13-May-19 01:45 AM This started as an amplifier for proportional gas detectors, but atm I'm aiming for semiconductor detectors, esp. PIPS for alpha spectrometry 13-May-19 01:48 AM how did you test the amplifier to see if you had the right feedback resistor/etc to set the amplification? 13-May-19 01:48 AM pico-amp current source? 13-May-19 01:48 AM I was trying to design an xray detector for dosimetry when FIBbing metals, using a PIN photodiode, but had no idea how much signal I would get out... and since the setup ran in vacuum, it was a pain to try iterating on changing settings and such... and I ran out of time (shelved the project for the future when I'm smarter) 13-May-19 01:52 AM ortec 419 pulser 13-May-19 01:52 AM that thing outputs simply 0 to 2 pC pulses 13-May-19 04:38 AM all the 3D printing 13-May-19 04:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-DFC38.png 13-May-19 04:39 AM yeya 13-May-19 04:40 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190513_133907-577B9.jpg 13-May-19 04:40 AM yeys 13-May-19 04:40 AM you guys 13-May-19 04:42 AM yeah? 13-May-19 04:46 AM you guys rule 13-May-19 04:46 AM or something semantically equivalent 13-May-19 04:47 AM heh, thanks 13-May-19 04:51 AM ️ 13-May-19 04:51 AM no more 3D printing time :< 13-May-19 04:51 AM something in the extruder is f*cky 13-May-19 05:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190513_140647-B2110.jpg 13-May-19 05:07 AM and now a nice wash in DCM 13-May-19 05:07 AM ... 13-May-19 05:07 AM step one: Check if your container is compatible with DCM 13-May-19 04:10 PM https://i.imgur.com/Tr795ux.jpg 13-May-19 04:10 PM Hacking a die-bonder into a pick and place 13-May-19 04:10 PM Because the old die bonder had issues and its a really nice X-Y-Z gantry for PnP 13-May-19 04:10 PM Also I don't quite have a use for a Die-Bonder. I bought it thinking it was a semi-automatic wire-bonder... not the case unfortunately. 13-May-19 04:54 PM Oh man, my day job is 30% die bonding 13-May-19 04:54 PM CNCing that would make me so happy 13-May-19 05:33 PM https://i.imgur.com/SOc3yZ9.mp4 13-May-19 05:33 PM The retrofit begins 14-May-19 12:07 AM do you have a balk/wedge bonder too? 14-May-19 12:07 AM ball 14-May-19 12:54 AM diff between die bonder and wire bonder is??? 14-May-19 02:40 AM die bonding is like flip chip, right? 14-May-19 02:48 AM like 14-May-19 02:48 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-6DAB7.jpg 14-May-19 02:48 AM maybe? 14-May-19 02:48 AM bzzzzzt 14-May-19 02:48 AM the whole die 14-May-19 02:48 AM BZZZZT 14-May-19 02:49 AM xD 14-May-19 04:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-BE6A6.png 14-May-19 04:06 AM https://giphy.com/gifs/reaction-8m8AHhr9zLa00 14-May-19 04:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190514_124104-AB20E.jpg 14-May-19 04:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190514_124427-3E23A.jpg 14-May-19 04:08 AM That's one way to do it 14-May-19 04:08 AM Though my nice ssr modules just have spade connectors lol 14-May-19 04:09 AM well that's the point 14-May-19 04:09 AM the nice ones do 14-May-19 08:04 AM Ah yea you know I never actually looked into what a die bonder does... I just kinda thought, well it doesn't do wire bonding which is what I need/want so uhm, hack time. 14-May-19 08:04 AM I suppose if it did ultrasonic welding of dies that would have been cool but I have a feeling making gold balls on dies is harder than just wire bonding the things flipchip then epoxy coating them 14-May-19 08:05 AM S/die/wire/ in my earlier comment about my own job 14-May-19 08:05 AM Because I'm a wire bonder on my team 14-May-19 08:06 AM I payed almost nothing for the thing... I think it was like 150 bucks or something. So I mean I didn't lose any money really lmao, its like 150 dollars in aluminum scrap 14-May-19 08:06 AM But I'll make it into a PnP machine because I've always wanted one and this will make a good size, hoping to get around 10 or so feeders in and allow for like a 150x150mm board area 14-May-19 08:06 AM Also your arm must vibrate really fast if your a wire bonder/s :P 14-May-19 08:09 AM I'm on my third coffee 14-May-19 08:09 AM Trying to achieve Philip J Fry speed 14-May-19 08:13 AM lol I love that episode 14-May-19 11:42 AM Sweet! 15-May-19 06:18 AM https://twitter.com/GigaBecquerel/status/1128646876256002049 15-May-19 06:18 AM I should get this thing going until the weekend 15-May-19 06:18 AM and I will make the best burnt pizza you'll ever see in there! 16-May-19 07:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190516_160055-4333E.jpg 16-May-19 07:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190516_155604-8F979.jpg 16-May-19 07:23 AM first test successful! 17-May-19 09:58 AM second test less successful 17-May-19 09:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190517_134316-D5909.jpg 17-May-19 09:58 AM at least my charge amplifier works as it should 17-May-19 09:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190517_173248-8A5CF.jpg 17-May-19 09:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-05-17_18-01-44-8CE81.jpg 17-May-19 07:19 PM What temperatures are you trying to get to? Is this a bakeout oven? I see a tube in the middle. Are you trying to build a tube furnace? 18-May-19 12:52 AM As hot as possible :D 18-May-19 12:52 AM no real goal here 18-May-19 12:52 AM and no tube furnace 18-May-19 09:49 AM Stuff some ceramic wool in the holes. It’s cheap on eBay or amazon and works wonders. I will send some pictures of my oven later to give you some ideas. 18-May-19 10:23 AM nice 19-May-19 05:56 PM Tubes on the pump. 19-May-19 05:56 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-36A98.jpg 19-May-19 05:56 PM The silver color on the anode is an aluminum coating. This is an actual 6C4 tube. In the mid 80’s sylvania made an attempt to have the place I used to do work make their common types and send lots of parts. I have full sets of parts for 6C4’s and 5687 tail triodes. 19-May-19 05:56 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-24BB8.jpg 19-May-19 05:56 PM Dual not tail. 19-May-19 05:56 PM 5687 19-May-19 05:56 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-66C95.jpg 19-May-19 05:56 PM Leak testing. You can tell a lot by the color of the discharge. Pink to violet and you are still dealing with air. When it goes blue to white you are dealing with water vapor which generally means you have a good seal. 19-May-19 05:56 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/video-C6267.mov 19-May-19 07:59 PM The color appearance of the aluminum coating after having been heated to red heat in vacuum. 19-May-19 07:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-92D14.jpg 19-May-19 08:36 PM And there are three tubes right off the pump ready for aging. 19-May-19 08:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-100C7.jpg 20-May-19 12:09 AM Awesome!! 20-May-19 06:19 AM Here’s a Seiko diamond CVD reactor. Powerful microwave magnetron, precursor gas injection, vacuum vessel and growth monitoring etc. 20-May-19 06:19 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-E0ECE.jpg 20-May-19 08:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190520_144314-73192.jpg 20-May-19 08:59 AM got to take apart a huge germanium detector 20-May-19 08:59 AM don't worry it was already dead 20-May-19 08:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190520_151132-9C989.jpg 20-May-19 08:59 AM one hell of a crystal 20-May-19 08:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190520_162718-B6D1D.jpg 20-May-19 08:59 AM very pure single crystal germanium 20-May-19 09:06 AM now re-melt it in your oven! 20-May-19 09:07 AM remelt it, draw a new high purity one and turn the Ge(Li) into a HPGE! 20-May-19 09:08 AM YES! 20-May-19 09:12 AM I think I'm gonna stick with readout electronics for now when it comes to designing detector stuff :D 20-May-19 09:16 AM naw :-( 20-May-19 10:18 AM That slug has gotta be worth quite a bit! 20-May-19 10:17 PM keep chamber closed 20-May-19 10:17 PM keep Summer safe 20-May-19 10:17 PM @GigaSquirrel how does the crystal feel to your tongue? 21-May-19 01:16 AM I don't think I want to know 21-May-19 07:43 AM It's got a relatively low toxicity. Only 31 recorded cases of health effects, and those were from long term industrial exposure 21-May-19 07:43 AM Soooooo... Lick it? 21-May-19 07:45 AM but it's got lithium on its surface 21-May-19 07:46 AM Well your mood will be super stable 21-May-19 07:47 AM yes, it will be "Damn, my tongue hurts!" for days 21-May-19 08:57 AM What form of lithium is it? 21-May-19 09:04 AM mostly diffused into the crystal, but a couple of µm of metal on the crystal 21-May-19 09:12 AM Still a pretty desk paperweight 21-May-19 09:12 AM yep 21-May-19 09:12 AM I ordered an acryllic case for it 21-May-19 09:13 AM I'd have just done a resin pour around it if you really wanted to seal it 21-May-19 09:13 AM I'd suspect it'd have no issues surviving the chemicals needed to dissolve the resin of you ever wanted it back out 21-May-19 09:14 AM it's all boron (I think) coated except for one Li Face 21-May-19 09:14 AM I'll take off the Li and display it in its original holder 21-May-19 09:15 AM What about the boron? 21-May-19 09:15 AM boron is quite robust 21-May-19 09:15 AM won't oxidise in air 21-May-19 09:15 AM What about laser ablation? 21-May-19 09:16 AM ...why? 21-May-19 09:16 AM Science? 21-May-19 09:19 AM but why would I take of the boron 21-May-19 09:19 AM it won't oxidise and I like the golden shine 21-May-19 09:20 AM I'd be guilty of trying to turn the massive chunk of germanium into a diode or something 21-May-19 09:20 AM Because seeing this has now given me horrible thoughts about oversized semiconductors 21-May-19 09:21 AM go get your own chunk of Ge 21-May-19 09:21 AM https://www.ebay.com/itm/323754294063 Just offer him like 200 bucks 21-May-19 09:24 AM Fleabay wants way too much 21-May-19 09:24 AM This is the kind of project with like a $50 limit lol 21-May-19 09:25 AM "lets make semiconductors with a $50 budget" 21-May-19 09:25 AM also that crystal is heavily doped 21-May-19 09:26 AM :P 21-May-19 09:26 AM Never said it has to be an efficient or useful semiconductor 21-May-19 09:26 AM Just a functional one 21-May-19 09:26 AM Could make a neat key or something 21-May-19 09:27 AM a source for pure germanium would be a HPGE detector, but if you take one of those apart I WILL take you apart 21-May-19 09:27 AM Lololol 21-May-19 09:27 AM Just like I'd do to someone if I caught them tearing apart a perfectly useful digital xray sensor or microfocus xray head 21-May-19 09:27 AM A dental xray head and pointing a dslr at a xray film cassette can only give so much quality 21-May-19 09:30 AM yep 21-May-19 09:30 AM I've still got a CCD with a 20x20 cm CsI lying around here somewhere 21-May-19 09:46 AM Is it a lensing setup for that large of a csl or is it one of the large format ccds? 21-May-19 09:46 AM The general price of those large format ccd detectors were basically "might as well buy a tesla/house" last I checked 21-May-19 10:06 AM large format ccd 21-May-19 10:16 AM Oooo 21-May-19 10:16 AM But is it functional? Those seem to be rather fragile and require extra accessories for processing or hard to obtain softare 21-May-19 10:22 AM Ooooh 21-May-19 10:22 AM Yeah those big ccds are big money 21-May-19 10:22 AM What do you use it for? 21-May-19 10:24 AM I have no Idea 21-May-19 10:24 AM did not put enough effort into it to learn hoe to read it out 21-May-19 10:24 AM it should work? 21-May-19 10:24 AM it's a prototype I got from the developer 21-May-19 10:24 AM Well if you come across it again see if you can find some info on it, this seems like it could be fun 21-May-19 10:25 AM I don't know if I can give out any information, afaik the company does not know it ever left the building... 21-May-19 10:26 AM Right now outside of spending way too much money on a complete kit, I have a Kodak sensor that I may try to make a readout for as an attempt to have a digital sensor 21-May-19 10:26 AM Ah lol 21-May-19 10:26 AM What sucks is I work for a company who's sister organizations make various types of xray units and sensors 21-May-19 10:26 AM But I doubt they'd let me get my hands on any 21-May-19 10:26 AM They actually assemble the handheld xray guns downstairs 21-May-19 10:27 AM just ask them 21-May-19 10:27 AM to talk to an engineer during lunch 21-May-19 10:28 AM The problem is the engineers I really need to talk to aren't in this building, I don't know which facility they would even be in 21-May-19 10:28 AM My department is support for dental chairs and dental delivery units 21-May-19 10:28 AM We do all that in this facility, that's all I think we have engineers for 21-May-19 10:28 AM But our parent company owns nomad, gendex, dexis, sordex, icat, and maybe a few more at this point 21-May-19 10:28 AM Nomad is the handheld guns they assemble downstairs 21-May-19 10:31 AM hm 21-May-19 10:31 AM do you have access to the scrap container? 21-May-19 10:31 AM No, most stuff seems locked down 21-May-19 10:31 AM The top parent company is Danaher 21-May-19 10:31 AM Thanks to that we have the standard mountain of corporate red tape 21-May-19 10:31 AM Once im a proper employee and not a temp I may be able to move around some and get in contact with the right people but that will take time 21-May-19 10:31 AM I probably need to get some contacts with the German teams, they probably handle most of this stuff 21-May-19 10:31 AM It's hilarious because the sensor I was wanting from the start was the standard gendex sensor 21-May-19 10:31 AM John McMaster made a Linux driver for it 21-May-19 10:31 AM And then I managed to get a job at one of the companies sister organizations but it doesn't help me any 21-May-19 10:31 AM I can't even access documentation on them 21-May-19 10:45 AM if you need any help translating to german, dann helfe ich gerne 21-May-19 10:53 AM Step one is getting access to the network share :P 21-May-19 11:02 AM Oh heck, I was just looking at the hierarchy for the company again and Danaher owned fluke/tektronix at one point, they got spun off under Fortive back in 2016 21-May-19 11:04 AM which means? 21-May-19 11:04 AM Just keep realizing that Danaher is a lot bigger than it seems 21-May-19 11:04 AM Apparently sometime later this year they're supposed to spin off the entire dental/imaging sector into its own company as well 21-May-19 11:04 AM But it could have been fun if I could have gotten in back then when tek/fluke were still part of Danaher and then jump from here to there 21-May-19 11:04 AM While it's still separate companies they apparently still worked it as an internal transfer 22-May-19 05:36 PM https://www.go-dove.com/shared/auction/images/photos/96185/96184485.jpg 22-May-19 05:36 PM I bought a big Titanium Sublimation Pump 22-May-19 05:36 PM no idea why other than it was stupid cheap and its conflat 22-May-19 05:36 PM I may only have a slight problem I swear 22-May-19 05:36 PM that top is 14-5/8th conflat 22-May-19 05:36 PM I have like... 13" conflat I think, but god even thats a new level of jeeezzz 22-May-19 07:57 PM if the pumping part of it turns out to be unsalvageable, you've got a doozy of a vacuum chamber now 22-May-19 09:02 PM yeaaaa 22-May-19 09:03 PM You don't know a 1/10th of it 22-May-19 09:03 PM ^ 22-May-19 09:03 PM lets just say I am going to sell computers because I will need entire shelves open for conflat 22-May-19 09:04 PM Rip the mainframe kid 22-May-19 09:04 PM That thing is never moving in 22-May-19 09:05 PM Honestly, I have a friend who might come take it 22-May-19 09:05 PM I might cut that cord really quick 23-May-19 05:57 AM Looking at this now it seems a bit silly... the conical onto the ISO 100 turbo is way more spacious than the conflat 2.75” cross. I should ditch the cross and just use the conical! Move the HV feed down to the top of the conical and weld in another 2.75” for the viewport - on the side of the conical. Also add a NW16 vacuum transducer port and little swagelok gas fitting welded in on the other side. 23-May-19 05:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-57A65.jpg 23-May-19 06:30 AM Heh... yea I understand that feeling. Cool that you have an ISO-100 turbo though, way easier to get parts/adapters for ISO-100. You should probably look into getting a throttle valve like like someday: https://www.ebay.com/itm/C158729-MKS-653B-13538-Butterfly-Throttle-Control-Valve-w-NW100-ISO-100-Flanges/392283510844 23-May-19 06:30 AM But I may be-able to hook you up with some larger conflat bits in the future once I get all my parts organized and sorted if you do end up needing a bigger chamber. 23-May-19 05:18 PM Yeah a butterfly valve would be nice one day when cash permits 23-May-19 05:18 PM How do they mount? ISO stuff is confusing - some with the several removable clamps and no holes, and some with bolt holes? 23-May-19 06:16 PM All ISO flanges uses elastomer seals. F types use bolts. K types use the little clamp nut things. To add further confusion ISO KF used the clamps with wing nuts and seals but do not match either of the others. All are exclusive and adaptors are required. For completeness ASA types all use elastomer seals as well. CF types use copper and knife edge. So there is no shock that glass systems are still in use in some places. You literally just melt any piece to any other piece of you have the skill set. 23-May-19 06:16 PM As time goes on though I appreciate brazed copper systems for their utility and ease of modification. 24-May-19 02:54 PM high pressure related, sorta.. got the diesel injector driver board rigged up and proper SPI communication with the stm32 + ecu kit.. 24-May-19 02:54 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0335-432D7.jpg 24-May-19 02:54 PM the previous "brain board" (a kl25z) broke on me a few weeks ago, so decided to finally rig all of this as it should have been 24-May-19 02:54 PM yeah, that's a rubber band holding things together 25-May-19 08:55 AM What engine is this for? 25-May-19 11:19 AM 2018 GM LH7, a 1.6L diesel in the chevy cruze & equinox (limitted run, no longer being produced) 25-May-19 11:19 AM I have a flow bench with the high pressure loop in my kitchen, that's another interesting shot.. 25-May-19 11:19 AM as good of a shot from my previous photos as any... 25-May-19 11:19 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0236-0AFE7.jpg 25-May-19 12:40 PM also, the actual engine I got only has like 3miles on it... like it fell off the carrier on it's way to the dealer or something 25-May-19 12:40 PM I called up GM with the VIN to ask if it was part of their crash test group - they reported no 26-May-19 09:47 AM You should contact Gale Banks. Might be able to get a job out of this! He is a great guy who is always looking people to develop the electronics end of diesel systems. 26-May-19 10:06 AM as in Banks Power? 26-May-19 10:06 AM I am working with an opensource ECU group/project, the rusEFI 26-May-19 10:06 AM also, I am going to school for a career change 26-May-19 10:06 AM trying to get out of IT.. simply doing some projects on the side 26-May-19 10:06 AM I actually thought about rolling up to his setup at some point when I get it all running to see how much he would be willing to donate (machine and tuning wise) to the cause 26-May-19 05:25 PM Listen to the Carcast Podcast anytime Gale was on it to get a feeling for what the guy is all about. He seems very into things like that 26-May-19 05:25 PM Made some little forms and trying out my salvaged wet saw and making some new glass/metal stems 26-May-19 05:25 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-85584.jpg 26-May-19 05:25 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-3F26A.jpg 26-May-19 05:25 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-CA8FC.jpg 26-May-19 08:29 PM The seal come out dark. I shut the oxygen off too soon while the glass was still at flowing temp and it instantly reduces carbon out into the glass. Figured I would stick on a getter, exhaust it, and see if it leaks over time. The getter would start turning. 26-May-19 08:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/video-9E68F.mov 27-May-19 08:34 PM @Charles what kinda tubes are you making? Are these simple triodes or something else? 27-May-19 08:41 PM Just practicing making stems. 29-May-19 08:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190529_172623-05CA0.jpg 29-May-19 08:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190529_172415-EA62E.jpg 29-May-19 08:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190529_172650-788BF.jpg 29-May-19 08:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190529_172730-CC496.jpg 29-May-19 08:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190529_171621-CFF19.jpg 29-May-19 08:32 AM ffs discord 29-May-19 08:32 AM why do you hate uploading files in their order 29-May-19 11:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190529_164521-816FE.jpg 29-May-19 11:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190529_164424-683AB.jpg 29-May-19 11:49 AM Absorber from Sumitomo helium cryocompressor 29-May-19 11:52 AM ohh 29-May-19 11:52 AM only thing missing now is a helium compressor, oil filter, cryo hoses, coldhead and liters of 5N helium! 29-May-19 11:54 AM Nah we swapped that at work 29-May-19 11:54 AM We have a bunch 29-May-19 11:54 AM or they 29-May-19 11:54 AM got ~2weeks left 29-May-19 11:54 AM One mayday we make balloons with 99.999% helium (ok we ware bleeding excess pressure from one compressor). 29-May-19 11:54 AM I think there's 2-3x compressors with hoses at the test range, tho only two in current use 29-May-19 11:54 AM and more compressors in storage. 29-May-19 11:57 AM If you need more gas to release inside there apparently I'm full of it today so I'm happy to share 29-May-19 11:58 AM lol 29-May-19 11:58 AM Speaking of compressors 29-May-19 11:58 AM We once got one from a customer back 29-May-19 11:58 AM There was frigging animal urine inside :DDDDDDDDDDDDDDD 29-May-19 11:58 AM Coworker suspected a cat. It was not the only problem with it but the most memorable one. 29-May-19 12:16 PM "WARNING THIS CAN EXPLODE" is delightfully blunt :D 29-May-19 02:45 PM Youp 29-May-19 02:45 PM Polite japanese 29-May-19 02:45 PM Even if the european representatives are UK based for Sumitomo. 30-May-19 11:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-C0BE5.png 30-May-19 11:14 AM close enough 30-May-19 11:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/S1960009-08F84.JPG 30-May-19 11:14 AM and for my next trick: 30-May-19 11:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/S1960010-F91F8.JPG 30-May-19 11:15 AM oh nice 30-May-19 11:16 AM now I've got to find every power strip in the house to power all that 30-May-19 11:16 AM lol 30-May-19 11:16 AM I know that feeling 30-May-19 11:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/S1960011-EFF90.JPG 30-May-19 11:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/S1960012-882E2.JPG 30-May-19 11:46 AM cough cough 30-May-19 11:47 AM heh 30-May-19 11:47 AM so long as your not running litterally everything at the same time you shouldn't blow a breaker right??? heh 30-May-19 11:48 AM they're all running right now 30-May-19 11:48 AM a power meter would be interesting 01-Jun-19 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-06-01_17-10-27-8BE97.jpg 01-Jun-19 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-06-01_17-10-25-C7EA0.jpg 01-Jun-19 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-06-01_17-10-21-62ECA.jpg 01-Jun-19 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-06-01_17-10-18-27EC1.jpg 01-Jun-19 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-06-01_17-10-16-24FB5.jpg 01-Jun-19 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-06-01_17-10-14-974C5.jpg 01-Jun-19 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-06-01_17-10-24-42EA5.jpg 01-Jun-19 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-06-01_17-10-23-380ED.jpg 01-Jun-19 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-06-01_17-10-19-F4C0F.jpg 01-Jun-19 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-06-01_17-10-22-9C881.jpg 01-Jun-19 08:17 AM Decided to do a small teardown of my -30 kV @ 100 mA power supply 01-Jun-19 08:48 AM are those 3 flyback transformers? 01-Jun-19 08:48 AM and, are they wired in parallel for more amperage? 01-Jun-19 08:48 AM or do you have 3 outputs 01-Jun-19 08:51 AM they feed in at different stages of the cascade 01-Jun-19 08:52 AM so each one doesnt output 30kv? or are they simply out of phase from each other? (it is very early and I havent had my coffee yet) 01-Jun-19 08:53 AM not sure about the phase 01-Jun-19 08:53 AM but no, the flybacks themselves don't do 30 kV 01-Jun-19 08:53 AM hrm.. any idea what they are capable of? 01-Jun-19 08:55 AM should be 10 kV 100 mA each 01-Jun-19 08:55 AM okay, got it 01-Jun-19 08:55 AM I remember my first experience with trying to make a HV supply was triggering a flyback from a tiny 555.. with no driver inbetween 01-Jun-19 08:55 AM I cooked the chip in about 3 pulses 01-Jun-19 08:55 AM that was a more stupid Noxz... I killed him 01-Jun-19 09:06 AM with high voltage? xD 01-Jun-19 05:57 PM back emf and overcurrent would have done it .P 01-Jun-19 07:16 PM Yeah. 555’s don’t like that. I think open collector current limit is like in the few tens of milliamperes range up to a heart stoping 16 volts or something like that 02-Jun-19 11:50 AM https://twitter.com/GigaBecquerel/status/1135254771001167872 02-Jun-19 12:07 PM @chucrut this might help you 02-Jun-19 12:17 PM Thanks @GigaSquirrel for taking pictures of your power supply 02-Jun-19 12:17 PM Im looking that multipliying ladder 02-Jun-19 12:18 PM you're welcome ^^ 02-Jun-19 12:18 PM but I was talking about the feedthrough 02-Jun-19 12:18 PM maybe I'm getting things mixed up, but weren't you looking for 20-30 kV feedthroughs? 02-Jun-19 12:19 PM Yes 02-Jun-19 12:19 PM Let me see 02-Jun-19 12:20 PM just click the twitter link ^^ 02-Jun-19 12:20 PM discords preview is a bit shitty 02-Jun-19 12:21 PM Wow. The final result is very professional 02-Jun-19 12:21 PM Any guess about how many kv can handle? 02-Jun-19 12:21 PM I've driven those at 30 kV no problem 02-Jun-19 12:21 PM but you need an extra insulator on the spark plug 02-Jun-19 12:21 PM let me look for the pictures 02-Jun-19 12:22 PM 30kv with a regular car sparkplug? 02-Jun-19 12:23 PM easy 02-Jun-19 12:23 PM Wow 02-Jun-19 12:24 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20180323_163533-D726A.jpg 02-Jun-19 12:24 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20180324_131750-EA81D.jpg 02-Jun-19 12:24 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20180326_000951-48E72.jpg 02-Jun-19 12:24 PM this is needed otherwise you'll get arcing along the insulator 02-Jun-19 12:25 PM You are right 02-Jun-19 12:25 PM You used plastic for the external insulator? 02-Jun-19 12:25 PM the red parts are 3D printed spacers, the disks are just ABS plastic 02-Jun-19 12:25 PM ABS or PS, I don't remember 02-Jun-19 12:26 PM Good. I can buy machinable plastic here 02-Jun-19 12:26 PM and a coat of paint ontop of everything 02-Jun-19 12:26 PM I see you also put some insulation at the vacuum part 02-Jun-19 12:26 PM @GigaSquirrel cute lil emco 02-Jun-19 12:27 PM Thanks 02-Jun-19 12:27 PM I am half planning on making something on my super 11 today 02-Jun-19 12:27 PM I need to first cut the rod to a rough size, and all that I have that can do it is a small jig saw 02-Jun-19 12:27 PM let's see if you can make the thing nicer on yours 02-Jun-19 12:27 PM I for some reason, do not have a hacksaw, now bandsaw 02-Jun-19 12:27 PM this is what I will be making: https://mb.nawcc.org/attachments/_1000895-jpg.144639/ 02-Jun-19 12:27 PM I dont have all the tooling required just yet though 02-Jun-19 12:28 PM what is it? 02-Jun-19 12:29 PM but, I can do a decent portion 02-Jun-19 12:29 PM it holds cutters for my small watchmakers lathe to "free-hand" 02-Jun-19 12:29 PM ahh, ok 02-Jun-19 12:29 PM cute 02-Jun-19 12:29 PM I've had the raw metal for a while, just havent got around to doing much with it 02-Jun-19 12:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/lukas_sparkplug-2824B.png 02-Jun-19 12:29 PM plan is to heat treat.. too 02-Jun-19 12:30 PM @chucrut that's the spark plug insulator 02-Jun-19 12:30 PM Good 02-Jun-19 12:30 PM never heard of heat threading, what is it? 02-Jun-19 12:30 PM / how do you do that? 02-Jun-19 12:31 PM heat treating? 02-Jun-19 12:31 PM it is hardening + temper 02-Jun-19 12:31 PM ah, my mistake, I read "threading" instead of "treating" 02-Jun-19 12:32 PM Lukas is getting old 02-Jun-19 12:32 PM So, he reads random words 02-Jun-19 12:32 PM also, why did that text show up as red 02-Jun-19 12:32 PM meh 02-Jun-19 12:32 PM I have a few other things to do today, but I hope to get to it.. there is a chnce I need to get the other jaws for the 3 jaw chuck, which only 2 came with the lathe :/ .. so yeah, may need to order 02-Jun-19 12:32 PM but I can sure try to hack off the chunk of rod I need 02-Jun-19 12:32 PM anywho, yeah 02-Jun-19 12:33 PM Im going make some lukas-plug too 02-Jun-19 12:33 PM If my electron gun explode, is lukas fault 02-Jun-19 12:34 PM text in read means there was an issue sending it 02-Jun-19 12:34 PM oh, I said "no worries :)" 02-Jun-19 12:35 PM haha, thanks 02-Jun-19 12:35 PM @chucrut I'll take that responsibility only if the crater is >3 meter 02-Jun-19 12:36 PM Im going to investigate about sparkplugs. Maybe truck sparkplugs are bigger 02-Jun-19 12:36 PM Or race cars sparkplugs 02-Jun-19 12:36 PM the issue with some is that they have a ~4kohm resistor inside 02-Jun-19 12:36 PM the J99 seems ideal, since it has no internal resistor and a long electrode 02-Jun-19 12:37 PM Did you weld that long metal rod ? 02-Jun-19 12:38 PM I did not modify that plug at all 02-Jun-19 12:38 PM Wow. Is very large 02-Jun-19 12:38 PM took an off the shelf J99 spark plug and turnt the Al part on the lathe 02-Jun-19 12:40 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/rod-05609.png 02-Jun-19 12:40 PM I mean that rod. Is also part of the original sparkplug? 02-Jun-19 12:40 PM I did not modify that plug at all 02-Jun-19 12:41 PM I didnt know exists sprakplug so large 02-Jun-19 12:41 PM Last question. Do you use compression fitting to seal the ceramic part? 02-Jun-19 12:43 PM what ceramic part? 02-Jun-19 12:43 PM Sorry. I just search pictures for J99 sparkplug 02-Jun-19 12:43 PM That big nut is also part of the spark plug 02-Jun-19 12:44 PM I did not modify that plug at all 02-Jun-19 12:44 PM okay, okay okay 02-Jun-19 12:57 PM http://www.fusor.eu/Engineering%20Works.html 02-Jun-19 12:57 PM Go to the bottom of that page, it goes over using the J99 plug to make an adapter 02-Jun-19 12:57 PM its basically the spark plug, the right KF adapter, and an oring 02-Jun-19 12:57 PM https://www.ebay.com/itm/Metric-M14-x-1-25-X-KF25-flange-stainless-steel-adapter-spark-plug-thread-std/322480729252 02-Jun-19 01:09 PM ahh, good old fred 02-Jun-19 01:09 PM yeah it really doesn't get any easier 02-Jun-19 02:06 PM ~60mm chunk of 38mm cold roll 1045 chopped off relatively quickly with a reciprocating saw... Metal Band saw on the list to get 02-Jun-19 02:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0353-B566B.jpg 02-Jun-19 02:06 PM I used biodiesel as the cutting fluid 02-Jun-19 02:06 PM thus why the saw blade paint is dissolved and not dry xfered 02-Jun-19 02:06 PM I learned the middle part of my 3 jaw is like 40mm minimal though.. so I think I need to get the proper inner jaw stuff to really work on this much further 02-Jun-19 02:06 PM but progress is progress 02-Jun-19 02:06 PM and good to know the recip saw has no issue with that diameter 02-Jun-19 02:06 PM it's just slightly too large to fit through spindle 02-Jun-19 02:25 PM not bad on that sawing action 02-Jun-19 02:25 PM it came out pretty good 02-Jun-19 02:25 PM I had to get through 40mm of copper with one of those once 02-Jun-19 02:25 PM the trick is to continue on the same path.. dont go to the backside after having done half of it 02-Jun-19 02:25 PM also a decent DeWalt blade 02-Jun-19 02:25 PM that was the day I decided I do not like machining copper 02-Jun-19 02:25 PM hah 02-Jun-19 02:26 PM the trick is to... Guess what I did wrong apparently 02-Jun-19 02:26 PM the chance that you line up with your first cut is kinda -meh- 02-Jun-19 02:26 PM also, apparently I found a hacksaw 02-Jun-19 02:26 PM I think my buddy who stayed wtih me for a bit left it 02-Jun-19 02:26 PM when he went back to Russia 02-Jun-19 02:28 PM isn't that a tool pretty much anyone owns, regardless of if they actually do stuff or not? 02-Jun-19 02:29 PM I had more of wood working saws 02-Jun-19 02:29 PM didn't really get into metal until recently 02-Jun-19 02:29 PM oh, ok 02-Jun-19 02:29 PM I never really got along with wood xD 02-Jun-19 02:29 PM too soft 02-Jun-19 02:29 PM too easy to break 02-Jun-19 02:32 PM I have a hard time completing projects.. I get them workable, but not completed 02-Jun-19 02:32 PM so I have never done any wood finsihing or staining 02-Jun-19 02:32 PM I've only done like 3 main projects though 02-Jun-19 02:32 PM some shleving for frogs, and the desk I am currently using 02-Jun-19 02:32 PM I have a mortisser and such (for mortise and tenon joinery) 02-Jun-19 02:32 PM still need more wood working tools, as well as metal 02-Jun-19 02:34 PM everyone needs more tools 02-Jun-19 02:34 PM okay.. I need some circlip pliers.. should I get the cheapo ones that will work at least once, or some slightly better quality ones 02-Jun-19 02:35 PM in my experience it's always better to get the high quality option, unless you know you'll only use it once 02-Jun-19 02:36 PM I will likely use circlips in the future and such, for more than this one application 02-Jun-19 02:37 PM well, there you go ^^ 04-Jun-19 07:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190604_142856-5F1AF.jpg 04-Jun-19 07:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190604_142850-253ED.jpg 04-Jun-19 07:09 AM I'm really getting the hang of turning KF 04-Jun-19 07:09 AM next step will be a brass one with lots of these inside 04-Jun-19 07:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190604_144519-3E32A.jpg 04-Jun-19 07:09 AM but I don't have round stock in the right size 04-Jun-19 09:48 AM those look nice, where'd you get those? 04-Jun-19 10:11 AM an electronics store around here had them 04-Jun-19 10:11 AM Hmm, how good are generic feed trough caps for vacuum use? 04-Jun-19 10:14 AM no idea tbh 04-Jun-19 10:15 AM I have both threaded and solderable one's in stock 04-Jun-19 11:34 AM so try it 04-Jun-19 11:54 AM My metal working tools are limited and I lack a good vacuum source currently. 04-Jun-19 11:54 AM Likely gona buy one of those cheap and noisy chinese pumps meant for servicing aircons 04-Jun-19 11:55 AM they're just not worth it 04-Jun-19 11:55 AM look for a good, used rotary vane pump on ebay 04-Jun-19 11:55 AM They are not good for it even at 50eur shipped? 04-Jun-19 11:56 AM what happened to "yours" at work? 04-Jun-19 11:56 AM Shipping is killer from USA 04-Jun-19 11:56 AM It's not my work anymore. 04-Jun-19 11:56 AM well buy from europe 04-Jun-19 11:56 AM oh 04-Jun-19 11:56 AM That unfortunately happened. 04-Jun-19 11:56 AM that sucks 04-Jun-19 11:56 AM Ya 04-Jun-19 11:56 AM Company hit hard times and folks in the R&D got made reudant 04-Jun-19 11:56 AM not all but some 04-Jun-19 11:56 AM Coz production brings in money 04-Jun-19 11:56 AM :DDD 04-Jun-19 11:57 AM lol 04-Jun-19 11:57 AM they could just close the company down, that way it would be faster and less painful 04-Jun-19 11:57 AM but yeah, the cheap chinese ones suck, just not in the way they should 04-Jun-19 11:57 AM won't get even close to their rated pressure 04-Jun-19 11:57 AM loud 04-Jun-19 11:57 AM very, very dirty 04-Jun-19 11:57 AM no flowback arrestor 04-Jun-19 12:00 PM Ok, good to know 04-Jun-19 12:00 PM so not worth it even at 50-60eur shipped? 04-Jun-19 12:01 PM IMO no 04-Jun-19 12:01 PM Ok 04-Jun-19 12:01 PM Money saved then 04-Jun-19 12:02 PM look on ebay for used rotary vane pumps, mainly auctions 04-Jun-19 12:04 PM Ok, and then check rebuild kits 04-Jun-19 12:04 PM I need to pester some folks I know at a university when I seem them. 04-Jun-19 12:04 PM At least one was involved in physics in the lab side of things 04-Jun-19 12:05 PM that may be a dumb question 04-Jun-19 12:05 PM but the people at your work 04-Jun-19 12:05 PM now that r'n'd has gotten smaller, do they really need all the stuff thes have there? 04-Jun-19 12:06 PM At least he had some accelerator and "warnign, radiation" stickers and "no loitering beyond this line" style of stickers in his work lab. :D 04-Jun-19 12:06 PM ohh, nice 04-Jun-19 12:06 PM I was thinking the same, but apparently no. 04-Jun-19 12:06 PM So instead of a pheiffer gauge I got a bottle of good wine as the parting a ways gift 04-Jun-19 12:07 PM ugh 04-Jun-19 12:07 PM It's reportedly really good wine, but I'd still rather have one of the pheiffer full range gauges I repaired 04-Jun-19 12:07 PM But most of the R&D and firmware testing parts are repairs or "suspicious" parts replaced in other gear. 04-Jun-19 12:07 PM So that code and electronics gets tested in worst conditions so to speak 04-Jun-19 12:07 PM From atmo to -8 and beyond drools 04-Jun-19 06:10 PM I feel so fortunate to have so many Welch pumps around I have never had to deal with direct drive ones. I ya r one of those cheap Chinese 2 stagers and I just use it for outgassing epoxy or leak testing thermocouple gauges. 04-Jun-19 06:29 PM What's wrong with the Welch direct drive pumps? I will use one as my main roughing pump and would like to know its quirks first 05-Jun-19 12:26 AM Problem with Welch pumps is the rebuild kits are EXPENSIVE 05-Jun-19 12:26 AM Like double the price 05-Jun-19 12:26 AM They are nice pumps, but expensive to rebuild and Adam had some other words about them he will likely now share 05-Jun-19 12:26 AM Everything with Welch is big and expensive 05-Jun-19 12:26 AM I feel attacked right now 05-Jun-19 12:26 AM It's not that I don't like Welch 05-Jun-19 12:27 AM lmao 05-Jun-19 12:27 AM I own 3 or 4 of them 05-Jun-19 12:27 AM I just saw you typing and last time I asked about Welch you told me to steer clear 05-Jun-19 12:27 AM It's just for applications like ours there are better 05-Jun-19 12:27 AM you have strong, well thought out, informed opinions :P 05-Jun-19 12:27 AM So yes I attacked you but its because I APPRECIATE you :P 05-Jun-19 12:27 AM lmao 05-Jun-19 12:28 AM The Welches do a good job at large vapor loads 05-Jun-19 12:28 AM Supposedly so do these Leybolds I have 05-Jun-19 12:28 AM Like vacuum desicators or freeze dryers 05-Jun-19 12:28 AM People really like them in labs for stuff like that 05-Jun-19 07:21 AM Yeah if I need a rebuild I'm looking at ~$200 here. Hoping I won't need to do that at least for a while. 05-Jun-19 02:37 PM Generally I only need seals, reed, ball, springs, and guides which most places call a minor rebuild kit then the pump is good for another 10 to 20 years! The slow speed of Welch pumps is great for applications where you have high gas loads, high volume, and want a quiet pump that runs cool forever. The Leybold pumps just always seem to need service. I actually swapped them all out for belt drive as I got tired of servicing them. Remember though. I was only concerned with vacuum tubes. But a good 1402 and motor properly broken with no leaks in the system is nearly silent. That and the fact I use diffusion pumps makes for just a quiet pleasant sound. The nigh speed of the direct drive pumps just never sat easy with me. 05-Jun-19 02:37 PM Oops. Broken in, not broken! Hahahaha. Use a properly broken pump. I have a few of them about too!! 05-Jun-19 03:40 PM How you you break them in properly? 06-Jun-19 07:50 AM First pre oil everything including the springs, guides, and vanes. Then run them for a while under no load. Plug the input then spin it by hand to get most of the air out of the inlet, then let it run for a while. Otherwise it can clatter like hell and possibly score up the vanes or wall of the stages until the oil gets to everything. Let it run up to temperature then flush and swap the oil. Should be good to go then. 06-Jun-19 07:50 AM This is after a rebuild 06-Jun-19 07:50 AM Oh. And I forgot to mention. Dump some oil in the inlet first! Best way to ensure the is oil on the vanes when first turning. 06-Jun-19 02:28 PM Thanks for the tips! 07-Jun-19 01:54 PM Good thing I bought a 25 SLPM MFC as well, the 0.2 SLPM for my vacuum system just isn't very impressive 07-Jun-19 03:23 PM Ohh nice 07-Jun-19 03:23 PM I think once I need an MFC for my stuff I'll probably design up a semi universal board for controlling them over USB/Serial interface 07-Jun-19 03:23 PM Since most all MFCs I've seen have that DB15 interface on them which all seem pretty standardized 07-Jun-19 03:24 PM just get a bürkert one, they already take serial 07-Jun-19 03:24 PM that's how I'm controlling that one 07-Jun-19 03:25 PM i think those go for like 500 bucks a pop in the states... I kinda remember discussing these models with you and all of them either didn't exist in the states or were super expensive 07-Jun-19 03:25 PM all the MFCs I see in the states for 5-50 dollars are all mostly analog 07-Jun-19 03:25 PM I mean tbh, an analog interface board would be small and relatively inexpensive 07-Jun-19 03:26 PM ouch, they really are that expensive 07-Jun-19 03:26 PM yeah a small USB controlled analog board would be great 07-Jun-19 03:26 PM not only for MFCs 08-Jun-19 08:09 AM damn I got a cryocooler for $80 08-Jun-19 08:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20190608_080949-5960E.jpg 08-Jun-19 08:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20190608_081001-848AA.jpg 08-Jun-19 08:09 AM http://www.phpk.com/pdf/CGR409-v6.pdf 08-Jun-19 08:11 AM Gonna make some LN2 with it? :D 08-Jun-19 08:12 AM Oh wow, crongrats! 08-Jun-19 08:13 AM Oh actually looks like it's a cryopump 08-Jun-19 08:13 AM But yes, LN2 is part of the plan 08-Jun-19 08:13 AM :-) 08-Jun-19 08:14 AM that's very cool 08-Jun-19 08:26 AM I think it might be able to do liquid helium 08-Jun-19 09:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20190608_091000-05264.jpg 08-Jun-19 01:42 PM Did you get a helium compressor with it? 08-Jun-19 03:42 PM no, but I can get one for about $300 on ebay 08-Jun-19 03:54 PM uhm, if you can you should buy them all, those things are worth thousands in operating condition, but if they need to be rebuilt or have a new absorber installed then maybe you can get one under 300. 08-Jun-19 03:54 PM you can get those cold heads for 300 or under all day long, though those can end up needing rebuild sometimes too 08-Jun-19 03:54 PM Most of the time when helium compressors are "for parts" and around 300 bucks its highly likely its FOR A REASON 08-Jun-19 03:54 PM so just be careful and don't end up throwing 300 bucks out the window and end up with a dud unit that isn't worth rebuildin 08-Jun-19 03:58 PM oh, so that needs a helium compressor added to it and it's not a self contained unit 08-Jun-19 03:58 PM boo 08-Jun-19 03:59 PM I've heard that the helium compressor is basically just a normal A/C compressor with a little more powerful motor and specially designed to not contaminate the vacuum with oil 08-Jun-19 03:59 PM I mean, compressors are compressors 08-Jun-19 03:59 PM but managing helium is an ordeal 08-Jun-19 03:59 PM keep in mind you can "recharge" a HeNe laser by putting it in a garbage bag filled to atmospheric pressure with helium 08-Jun-19 03:59 PM just goes right through the glass 08-Jun-19 04:00 PM uhm... yea helium will leak out of almost anything... 08-Jun-19 04:00 PM it is NOT a normal A/C compressor, it may have the same functioning principle 08-Jun-19 04:00 PM but its constructed very differently 08-Jun-19 04:00 PM also @Treehouseman I don't know if I've ever seen an "all in one" unit... 08-Jun-19 04:01 PM it pretty much says outright on wikipedia that it is similar in specs to an A/C compressor. maybe that's wrong, feel free to edit it if it is 08-Jun-19 04:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-7162C.png 08-Jun-19 04:01 PM https://en.wikipedia.org/wiki/Cryocooler#GM-refrigerators 08-Jun-19 04:02 PM again, in specs maybe, but thats like saying a cheap part is similar in specs to an expensive part 08-Jun-19 04:02 PM construction is way different though and testing is way different 08-Jun-19 04:02 PM refrigerants are MASSIVE molecules, helium is super duper tiny 08-Jun-19 04:02 PM what a refrigerant won't leak out of helium will in a second 08-Jun-19 04:02 PM it has nothing to do with saying they are different or not in principle or even construction 08-Jun-19 04:02 PM it has to do with whether you can keep helium inside the thing for longer than 5 minutes 08-Jun-19 04:04 PM how do party helium tanks work? is the pressure just different? 08-Jun-19 04:04 PM no, they look to sell them before it's all gone 08-Jun-19 04:04 PM also welds 08-Jun-19 04:04 PM the goal is it only slowly leaks out the valve 08-Jun-19 04:05 PM uhm, they just contain compressed gas, I don't believe those go to the pressures of liquification like a helium compressor would 08-Jun-19 04:05 PM yes but Conmega was saying it will leak in 5 minutes 08-Jun-19 04:05 PM I am giving an exageration on what could be 5 minutes or 5 days or 5 weeks 08-Jun-19 04:05 PM oh yeah, lol, liquid helium is an entirely different beast too 08-Jun-19 04:05 PM well there's a pretty big practical difference there 08-Jun-19 04:05 PM go lookup videos about liquid helium 08-Jun-19 04:05 PM stuff doesn't care about gravity 08-Jun-19 04:06 PM and sorry I forgot to mention, this thing can't liquefy helium 08-Jun-19 04:06 PM either way, my point is you don't want to spend a month hacking something together to end up spending hundreds of dollars on helium recharges every month 08-Jun-19 04:06 PM it lacks the second stage that goes down to 20K 08-Jun-19 04:06 PM ... 08-Jun-19 04:06 PM ... 08-Jun-19 04:06 PM go read how a helium cryo compressor system works 08-Jun-19 04:06 PM its a phase change that causes it to get that cold 08-Jun-19 04:06 PM aka... the helium is compressed into a liquid, ran up to the pump head, then decompressed into a gas cooling the head 08-Jun-19 04:07 PM I'm saying it's rated for 77K, not liquid helium 08-Jun-19 04:07 PM I know how phase change refrigeration works 08-Jun-19 04:07 PM ... 08-Jun-19 04:07 PM this is not that, it's a stirling cycle 08-Jun-19 04:07 PM the helium doesn't get liquefied in a GM device afaik 08-Jun-19 04:07 PM helium is used for higher speed of sound (better prandtl number) I think 08-Jun-19 04:09 PM The thermal absorbtion from HP to LP helium vs liquid to gaseous helium is like comparing a betavoltaic battery to russian lighthouse rtg 08-Jun-19 04:09 PM hrm, fair enough, that would explain why the cryo head needs electric, but its still upwards of 200~?PSI of helium 08-Jun-19 04:09 PM I actually don't know the heat of fusion versus specific heat of helium 08-Jun-19 04:10 PM hacking a system together to withstand those pressures of helium without a leak would still take more money than just getting a proper helium compressor for around a grand 08-Jun-19 04:10 PM You CAN get compressors for cheaper than that but you really need to hunt and get lucky 08-Jun-19 04:10 PM get in with scrap dealers in the area that deal with specialized equipment and such and keep an eye out for surplus 08-Jun-19 04:10 PM though, most of them are larger units requiring 3 phase so keep that in mind 08-Jun-19 04:13 PM @Treehouseman heat of fusion of helium is 3.45 kJ/kg, specific heat is 5.19 kJ/kg PER KELVIN 08-Jun-19 04:13 PM so there is absolutely no point in doing phase change refrigeration with helium 08-Jun-19 04:13 PM unless you want to get down to liquid helium temperatures maybe 08-Jun-19 04:13 PM @Conmega I'm actually skeptical that many of those $300 helium compressors on ebay are worthless. it's scientific equipment, so probably really overengineered, and most sellers probably don't know how to test it, hence the "for parts" listing. also, they are big and heavy so the seller probably just wants to get rid of the thing. 08-Jun-19 04:13 PM the worst case scenario is that the motor windings are burnt out, and that's easy to test when you pick it up 08-Jun-19 04:13 PM (and not doing local pickup would be a mistake) 08-Jun-19 04:13 PM I know that they commonly take 3-phase 480V and have already planned for that scenario (though I'm not sure how much power they draw, so I am a bit concerned) 08-Jun-19 04:28 PM also if I'm going to spend ~$1K then I might as well just buy something like https://www.ebay.com/itm/Superconductor-Technologies-Hybrid-98-Cryocooler-Liquid-Air-Nitrogen-Generator/303180339294?hash=item4696f4d85e:g:3LwAAOSwBPlc-XbD:sc:USPSPriority!94040!US!-1 08-Jun-19 04:37 PM If you just want LN2 just buy LN2 tbh... But either way, the ones for 300 will likely at minimum need an absorber change, those are 500~ish dollars a pop referb or new. And no worst case isn't motor windings burnt out, its that the thing has enough hours on it that the compressor is starting to pass a ton of oil into the loop and will cause your absorber to get used up real fast and possibly damage your pump head if any of that oil gets up into that system. 08-Jun-19 04:37 PM They don't have those 500ish dollar absorbers in there for no good reason 08-Jun-19 04:37 PM that's assuming I want to do cryopumping 08-Jun-19 04:37 PM and yes, I agree that that's true if I want to do cryopumping 08-Jun-19 04:38 PM I don't understand that statement 08-Jun-19 04:38 PM if its not operating properly its not operating properly 08-Jun-19 04:38 PM the oil issue is only really a problem for the cryocooler if it's being used for a cryopump, no? 08-Jun-19 04:39 PM uhm, it'll probably effect the longevity of the pump head, the seals which keep the thing from leaking helium, and the ultimate temperature of the thing 08-Jun-19 04:39 PM so I would say it matters if you want to use it at all 08-Jun-19 04:39 PM also I read somewhere that these helium compressors achieve low oil by using special seals without oil 08-Jun-19 04:39 PM though they probably also have an absorber 08-Jun-19 04:40 PM every helium compressor I've ever seen has an absorber in it 08-Jun-19 04:40 PM okay, well if you're talking from personal experience then I can't disagree 08-Jun-19 04:41 PM I have 3 helium compressors myself and I've been in places running tons of them 08-Jun-19 04:41 PM I've always been told its mostly for oil contamination and keeping it out of the rest of the system, but also remember some cryo heads themselves are lubricated 08-Jun-19 04:41 PM some even have windows so you can see into that area, and you can see the oil 08-Jun-19 04:41 PM so even if the compressor has no oil there is generally a reason to have an absorber to keep the helium clean and dry 08-Jun-19 04:41 PM I am not saying you can't bodge something to work, I am just saying that I would worry about longevity at that point 08-Jun-19 04:41 PM and if your spending hundreds on something I doubt you want it to last maybe a few months? a year if your lucky? I assume you'd like it keep it in service for as long as you can 08-Jun-19 04:43 PM also, what is the absorber? is it just pretentious (i.e.: marked up for scientific markets) activated carbon? 08-Jun-19 04:43 PM or silica gel 08-Jun-19 04:43 PM refrigerant absorber, like what your car or house hvac system has 08-Jun-19 04:43 PM but more specialized for use with helium 08-Jun-19 04:44 PM they are all labeled Trillium online 08-Jun-19 04:44 PM erm maybe thats a brand 08-Jun-19 04:44 PM lets see 08-Jun-19 04:44 PM Replacement adsorbers are fabricated using new dehydrated charcoal, screens, felt pads, glass wool and Aeroquip couplings. All adsorbers are carefully cleaned, packed, decontaminated, leak checked and charged with 99.999% ultra high pure helium. 08-Jun-19 04:44 PM http://www.ptbsales.com/helium-contamination/ 08-Jun-19 04:44 PM helium is inert though, so why would that affect the adsorption capabilities of the material? is it just a really good adsorber? 08-Jun-19 04:45 PM also good information 08-Jun-19 04:45 PM cool thanks 08-Jun-19 04:45 PM they say to use 99.999% helium 08-Jun-19 04:45 PM those absorbers have to be packed with extremely clean stuff to avoid contamination more than it helps 08-Jun-19 04:45 PM yes but "Cryopumps require 99.999% pure helium; the helium purity of the analyzed cryopump was 98.7% resulting in inefficiencies in the refrigerator which prevented the cryopump from cooling down to <=17K." 08-Jun-19 04:45 PM that kind of implies that 98.7% works up to 17K 08-Jun-19 04:45 PM which is far lower than I'm going (77K) 08-Jun-19 04:46 PM in that system they tested it implys that 08-Jun-19 04:46 PM "the car only lost 5mpg with the tires deflated to 5psi" 08-Jun-19 04:46 PM that exact system with the exact amount of wear it has 08-Jun-19 04:46 PM "surely that's perfectly fine to drive on indefinitely right?" 08-Jun-19 04:46 PM thats erm not how I would put it 08-Jun-19 04:46 PM but I would think its very non-linear 08-Jun-19 04:47 PM Yeah, different scale, but the same kinda idea where, yeah, it might work, abeit at a reduced effiecency, but that's not to say it won't cause other issues over time 08-Jun-19 04:47 PM I know it's not going to be perfect, but this is only a 1 stage device, not a 2 stage device like they're talking about 08-Jun-19 04:48 PM That manual you linked doesn't look like the second stage is optional 08-Jun-19 04:48 PM well, I might be wrong; but the size of the device makes it seem like there is no second stage 08-Jun-19 04:48 PM I haven't taken it apart though 08-Jun-19 04:48 PM it also has a slightly different model number 08-Jun-19 04:48 PM I'm just saying that it seems likely that I can get by on 99.9% or something 08-Jun-19 04:50 PM I would just look for a helium compressor with less than 5K hours on it at least 08-Jun-19 04:50 PM okay, that is a good piece of information to keep in mind, thank you 08-Jun-19 04:50 PM absorbers are rated for about a year which is like 8K hours or so, and I would assume thats for close to constant use 08-Jun-19 04:50 PM Oh also keep an eye out for the cryo lines... 08-Jun-19 04:50 PM those things are expensive, I have not seen them for less than 50 bucks a piece for really weird shaped ones 08-Jun-19 04:50 PM ussually they float around 75-100 a pop 08-Jun-19 04:50 PM so if you find a decent hose for cheaper than 75 bucks buy it 08-Jun-19 04:50 PM make sure its got the right ends on it for your compressor head and whatever unit you get though... 08-Jun-19 04:50 PM because some devices have male and some have female, doesn't appear to be any kind of standardization across all companies 08-Jun-19 04:54 PM gotcha 09-Jun-19 11:43 PM On a related note, I’m making a simple little temperature sensor for our Sumimoto helium cold head. I’m too cheap to buy the proper Lakeshore readout box. https://github.com/lukeweston/temperature_sensor 12-Jun-19 01:46 PM We did not buy a lakeshore readout box at my previosu employer 12-Jun-19 01:46 PM We biased the diode by 10uA in a 4point measurement and fed the resulting voltage to an instrumentation amp and then an ADC in the cryocontroller electronics. 12-Jun-19 01:46 PM LUT's for the diodes ware not even included on the embedded side of things, it was done on a higher level 12-Jun-19 01:46 PM 10uA current was due to avoiding heating. 12-Jun-19 01:46 PM Or one just looks at it with a multimeter in diode mode briefly and goes "Ya that's under 10K, things look ok" 12-Jun-19 04:10 PM That’s basically exactly what I’m going to do. 10uA current source and manual lookup with a benchtop Keithley voltmeter semi permanently connected. 12-Jun-19 10:58 PM Somebody tell me "no!" https://www.govdeals.com/index.cfm?fa=Main.Item&itemid=277&acctid=11866#media 13-Jun-19 06:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190613_144710-7C254.jpg 13-Jun-19 06:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190613_144717-FBBBC.jpg 13-Jun-19 06:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190613_144741-E80B1.jpg 13-Jun-19 06:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190613_144850-5FC58.jpg 13-Jun-19 06:33 AM didn't want to pay 50 bucks and wait a week for an ISO-100 flange 13-Jun-19 06:33 AM so I turned one myself 13-Jun-19 08:16 AM nice! 13-Jun-19 09:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190613_181845-C1061.jpg 13-Jun-19 09:43 AM looks like there are no leaks 13-Jun-19 09:47 AM yet 13-Jun-19 09:49 AM Wow I'm glad you can see vacuum leaks! Who needs a He leak detector when you have a Gigasquirrel! 13-Jun-19 09:49 AM Pinned a message. 13-Jun-19 09:49 AM Ok who put the pin message next to edit. 13-Jun-19 09:50 AM lolol 13-Jun-19 10:04 AM *non-significant leaks for the range I work in :P 13-Jun-19 10:12 AM hmm, my boss still has a He leak detector... 13-Jun-19 10:12 AM Well 13-Jun-19 10:12 AM Maybe it's time that Gigasquirrel have a he leak detector 13-Jun-19 10:15 AM I think owning one is very depressing 13-Jun-19 10:15 AM I want to believe I have no leaks 13-Jun-19 10:24 AM 4e-5 after an hour of pumping 13-Jun-19 10:24 AM no baking and everything in there was at atmosphere for weeks 13-Jun-19 02:27 PM 4.7e-6 at the moment 13-Jun-19 02:29 PM neat neat.. I need to stock up on some metals 13-Jun-19 02:29 PM I have a small project in the works, with bluetooth.. everything is better with bluetooth! 13-Jun-19 02:30 PM nooo 13-Jun-19 02:30 PM wires 13-Jun-19 02:30 PM thick bundles of high speed coax! 13-Jun-19 02:30 PM https://live.staticflickr.com/7232/7190148027_1c68243fa4_b.jpg Vacuum chamber goals 13-Jun-19 02:40 PM Is that an integrating sphere? 13-Jun-19 02:40 PM it's the trinity device 13-Jun-19 02:40 PM ... 13-Jun-19 02:40 PM Oh 13-Jun-19 02:40 PM ️ 13-Jun-19 02:42 PM :D 14-Jun-19 09:20 PM Hahahaha.. I know Los Alamos had to move some things when the last fire was coming close but this is ridiculous. Hahahah WARNING This statement was not based in reality, and most likely any other version of reality. 15-Jun-19 12:04 PM hiii 16-Jun-19 10:49 PM <__ice9#6039> ... I was going to say 16-Jun-19 10:49 PM <__ice9#6039> That looked verrrrry familiar 26-Jun-19 08:03 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_1983-BCB6A.JPG 26-Jun-19 08:03 PM Plasma wand! 26-Jun-19 08:05 PM kinky 28-Jun-19 09:35 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190628_045429-74764.jpg 28-Jun-19 09:35 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190628_045515-9E7ED.jpg 28-Jun-19 09:35 AM Etched that text into a U.S. quarter 28-Jun-19 09:35 AM Thanks to @AdamMcCombs for helping me get over the hump of the few last electrical and vacuum connections and giving the confidence to actually apply power! 28-Jun-19 09:49 AM ohhhh neat!!! 28-Jun-19 09:49 AM now thats just ion milling? 28-Jun-19 10:03 AM Yeah 28-Jun-19 10:03 AM Milling + imaging (which also will mill, so you have to be careful) 28-Jun-19 11:06 AM lol that's pretty awesome! 28-Jun-19 11:20 AM yea that's really cool 28-Jun-19 11:20 AM So does ion milling only work on certain materials or will it blast practically anything away? because I thought ion etching was limited or too slow to be useful for most things thus why they end up using reactive ion etching for a LOT of stuff. But you seem to get a decent aspect ratio there? 28-Jun-19 12:09 PM It is slow compared to RIE, but it's a 5nm beam at best running conditions, and you raster it however you want 28-Jun-19 12:09 PM Diff materials have different ablation rates 28-Jun-19 12:09 PM And you can introduce gas in the beam path to etch faster, or even do deposition 28-Jun-19 12:09 PM But FIB is used a LOT in failure analysis prep 28-Jun-19 12:09 PM They take a chip, decap it, then cut a box around specific areas, then tilt and start to cut the bottom on the "tab" that was just made with the box cut 28-Jun-19 12:09 PM Then bring in a micromanipulator and weld the tab to it 28-Jun-19 12:09 PM And snap off the tab, then transfer to a TEM grid 28-Jun-19 12:23 PM interesting, I need diagrams though to fully understand what you just said for TEM grid prep lol. Not that it matters I don't have a TEM. 28-Jun-19 12:23 PM But yea I believe the etch will be too slow with silicon to be useful for etching and or there is contamination with re-deposition that can cause a problem. 28-Jun-19 12:46 PM It really depends 28-Jun-19 12:46 PM Fib is used for lithography mastering sometimes 28-Jun-19 12:46 PM It has less of the proximity effect that e-beam hs 28-Jun-19 12:46 PM Has 28-Jun-19 12:46 PM I.e. electrons in the volume of excitation 28-Jun-19 12:46 PM The ion beam is primary reason for resist exposure and only electrons are secondary emissions 28-Jun-19 12:46 PM While e-beam exposure is electrons and then you still have secondaries 28-Jun-19 12:46 PM So you can get finer linewidths with fib exposure 28-Jun-19 12:46 PM You can also do circuit rework (rewiring) with fib... Mill away some insulator to a wire you know about, add metal gas to deposit metal, then deposit all the way to some other wire and bam, they're shorted 29-Jun-19 03:28 AM Pinned a message. 30-Jun-19 09:53 AM New high speed air spindle for my mill 30-Jun-19 09:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/3942b480594b11cee0f585e49ff5db88-D7B4C.jpg 30-Jun-19 09:53 AM Little bit cleaner after some work using a stainless ruler to scrape the ceramic and zirconia buildup off 30-Jun-19 09:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/dee8e58b0435a85c8e1147e3639d2875-29406.jpg 01-Jul-19 12:15 AM What was it previously used for? 01-Jul-19 12:53 AM dental milling i was told 01-Jul-19 12:53 AM Making zirconia crowns and dental ceramic. Not sure why they didn't bother to clean them. 01-Jul-19 12:53 AM The eBay seller let it go for a really good price because he had already cleaned up some others. 01-Jul-19 01:58 AM I was wondering if it was dental 01-Jul-19 01:58 AM Going to keep using for ceramic? 01-Jul-19 02:06 AM My plans are mostly metal and possibly some plastics 01-Jul-19 02:06 AM Not sure if I want to get ceramic residues on my mill 01-Jul-19 02:06 AM Still thinking about it 01-Jul-19 02:07 AM What's the advantage in that application for this spindle? 01-Jul-19 02:08 AM Mainly that the spindle on my mill has a fairly low RPM and I get a lot of requests for fine engraving work 01-Jul-19 02:09 AM Makes sense. What's the mill this is going on? 01-Jul-19 02:09 AM I have a Tormach 1100 Series 3 so the max RPM on the main spindle is a bit over 5000rpm 01-Jul-19 02:09 AM I'm guessing it's also cost advantages because you get cooling for free 01-Jul-19 02:09 AM "free" 01-Jul-19 02:10 AM I only spent $110 shipped for the air spindle 01-Jul-19 02:10 AM Was too good a price not to take the risk even if the collets are $70 01-Jul-19 02:10 AM Yeah dang 01-Jul-19 02:10 AM You pay that much for hand pieces 01-Jul-19 02:10 AM Came with the coolant nozzle and that burr 01-Jul-19 02:10 AM Lemme grab the eBay listing 01-Jul-19 02:10 AM https://www.ebay.com/itm/183744354076 01-Jul-19 02:12 AM Ok so I wasn't expecting 150000 rpm 01-Jul-19 02:12 AM Right? 01-Jul-19 02:12 AM What's the thing sound like??? 01-Jul-19 02:12 AM It sounds like a dental drill but 10x scarier and it doesnt go anywhere near your teeth 01-Jul-19 02:12 AM I can probably take some video tomorrow 01-Jul-19 02:13 AM *while they are in your mouth 01-Jul-19 02:14 AM The depth of cut is pretty limited with radius X 0.1mm 01-Jul-19 02:14 AM But the suggested surface speeds at 150krpm are insane 01-Jul-19 02:14 AM Hardly any tourqe? 01-Jul-19 02:15 AM My machine only rapids at 100ipm and that is the very low end of the feed rate on the spec sheet. http://www.nskamericacorp.com/Catalog/NSK_Catalog_2017/195/ 01-Jul-19 02:15 AM I have not tested the torque but it is only 25W of output power so I assume it is pretty low 01-Jul-19 02:15 AM Should be perfect for engraving and very light milling ops 01-Jul-19 02:18 AM Makes sense. I'm guessing unlike some other types of spindles power scales directly with speed? 01-Jul-19 02:19 AM Not sure, brand new to air spindles but the math worked out money wise 01-Jul-19 02:19 AM This was cheaper than buying a dremel or more proper auxiliary spindle to stick on my mill 01-Jul-19 12:43 PM Shot a quick little video of the spindle: https://www.youtube.com/watch?v=BT22R1U7L0Y 01-Jul-19 01:02 PM Oh man I love the sound of high speed turbines and spindles spinning up. Awesome! 01-Jul-19 01:41 PM Well, figured I would share some pictures of early pulsed power stuff I have worked on here to show just how stupid cheap and simple this stuff can be. The only requirement really is having a decent enough scope with enough bandwidth that you can see the pulses and risetimes of interest. But other than that, it is fully scaleable from very low power to massive. Unfortunately I can't share pulse shapes since they were taken on government owned scopes, but you can get the general idea. Some of the outputs were stupid clean pulses for how cheap the stuff was made. 01-Jul-19 01:41 PM 50 ohm, 10ns, 40A stripline blumlein pulser. Relatively decent rep rates with the spark gap being so close together and operating at relatively low voltage. Load was literally just a simple 1/4W 50 ohm carbon resistor across the blumlein output. Made with 1/16" teflon and maybe 1/2" wide copper foil. 01-Jul-19 01:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Long_Blumlein_Line_Reduced_Size-11A9F.jpg 01-Jul-19 01:41 PM Spark gap of the blumlein. Super jank, but worked excellently in a pinch. 01-Jul-19 01:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Long_Stripline_Blumlein_Spark_Gap_Reduced_-A3CBC.jpg 01-Jul-19 01:41 PM Short stripline blumlein, less than 5nS into a 50 ohm load. Made again with teflon sheet and copper foil tape. Placed inside a pvc pipe and filled with oil. 01-Jul-19 01:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Short_Stripline_Blumlein-7E90A.jpg 01-Jul-19 01:41 PM Short cable blumlein, made from RG8 coax. 4 pieces total, with each leg consisting of 2 in parallel. Output impedance again 50 ohms, less than 5ns. I have made a longer 15ns one used to drive the linac electron gun with nearly 100A at 30kV charging voltage, which was also immersed in a pvc tube filled with oil. Connections were copper foil and wires using hose clamps. 01-Jul-19 01:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Short_Cable_Blumlein_Resized-CC59B.jpg 01-Jul-19 01:41 PM Magnetically quenched triggered spark gap switch for higher rep rate operation. 3d printed housing used to hold flat plate electrodes with spare magnets on the top and bottom. Another short stripline blumlein is seen connected to it in the background. 01-Jul-19 01:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Magnetically_Quenched_Triggered_Gap-F3E52.jpg 01-Jul-19 01:41 PM When I get the chance, I will also get some pictures of some solid state pulsers I have built. Using stacks of generic surface mount 2n2222 transistors operating in avalanche mode, you can deliver very short ns pulses at several tens of amps to a 50 ohm load. I think the largest stack I made was 40 transistors in series. This delivered about 35A at around 5ns to a 50 ohm load. We pushed them to 1khz rep rates, but they rapidly degraded. However, at much lower rep rates they should last fine. 01-Jul-19 02:19 PM @Applied_Ion govt scopes mean taxpayer scopes... you sure you can't share that taxpayer funded data too? 01-Jul-19 02:19 PM when I worked at LBNL I was able to share a lot, if not all 01-Jul-19 02:22 PM It belongs to KAPL, and they don't want pictures of sensitive equipment in the public domain without being cleared. The data is fine to share lol, but I took data by taking pictures of the oscilloscope screen with my phone... 01-Jul-19 02:23 PM vectorize with inkscape? 01-Jul-19 02:23 PM I thought about tracing it so you can get the general idea lol, that could work 01-Jul-19 04:04 PM Well, here it is. The first of the waveforms from some of my early pulsed power experiments. The lines don't look straight because the picture was taken at an angle of the oscilloscope screen. Everything is traced though exactly like on screen however, and will give a good idea 01-Jul-19 04:04 PM This is from the long stripline blumlein from above into a matched load. Behold, the power of scraps and trash! 01-Jul-19 04:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/10ns_Stripline_Blumlein_Pulser_Output_Wave-48652.jpg 01-Jul-19 04:08 PM I'm sorry, but that grid is infuriating 01-Jul-19 04:08 PM best I can do lol, thats what it looks like if you are looking at the picture 01-Jul-19 04:09 PM I know how it came to be, it's just.... making me question if I'm sober on first glance 01-Jul-19 04:09 PM lol 01-Jul-19 04:17 PM " I think the largest stack I made was 40 transistors in series.", so smd 2n2222 can survive 35A for 5nS? 01-Jul-19 04:56 PM yes. Each transistor can be avalanched at around 150V. If you do it at a short enough time scale, like 5ns, the transistor will not be destroyed 01-Jul-19 04:56 PM Actually we use a single transistor avalanched like this for the initial pulse input to our fast gun driver 01-Jul-19 04:56 PM by using a small piece of coax as the transmission line, the pulse width can be changed 01-Jul-19 04:56 PM we typically avalanche from maybe 5ns to several tens of ns 01-Jul-19 04:56 PM so we charge up the coax transmission line to 150V, and then trigger the transistor to avalanche creating a ns pulse the same width as the storage line 01-Jul-19 04:56 PM I will have to dig up the schematic, it is a really cool trick you can do 01-Jul-19 05:07 PM Note though that a single transistor, with a characteristic circuit impedance of 50 ohms into a matched load, charged to 150V will only deliver 3A. To increase this current, higher voltage is needed. That is why the stack was used, so the avalanche voltage could be increased, therefore increasing current. So the total charging voltage across the cable transmission line and stack was maybe around 1750V for 35A into a 50 ohm load. 01-Jul-19 05:07 PM however, with bigger stacks, and higher voltages, performance will degrade and the stack will fail at a certain point or very high rep rate, as we found out. 01-Jul-19 05:07 PM Here are a few more waveforms I traced out from some other small pulsed power projects I worked on: 01-Jul-19 05:07 PM Magnetically quenched triggered spark gap switch, operating at around 74Hz to deliver about 8A pulses into a 50 ohm load in around 5ns. 01-Jul-19 05:07 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Magnetically_Quenched_Triggered_Spark_Gap_-8003A.jpg 01-Jul-19 05:07 PM This one is from one of my cable blumlein pulsers made from RG8 coax, charged to about 25kV to drive a thermionic emission gun biased at -155kV. This is the resulting beam current signal on the faraday cup. I pushed this sucker to almost 100A in to squeeze out maybe 16A from the gun (we were trying to find the max output for design purposes, and didn't have a pulser strong enough to do it before.) 01-Jul-19 05:07 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Cable_Blumlein_Pulser_Driven_Electron_Gun_-5FD27.jpg 01-Jul-19 05:07 PM Finally, this system wasn't shown in the pictures above, but is the output waveform of a pseudo spark gap switch used to create sub-nanosecond pulses, which were sliced from much larger pulses driven by a normal hydrogen thyratron PFN-based pulser. The timing of these circuits had to be right for the pulse slicer to fire at the right time to reduce the pulse width from several hundred ns down to about 800ps. Lot of ringing and nasty overshoot on this one. The first downward spike is the 800ps converted pulse, around 24A into a 50 ohm load. 01-Jul-19 05:07 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Pseudo_Spark_Gap_Switch_Subnanosecond_Puls-68A78.jpg 01-Jul-19 05:35 PM Nice. 01-Jul-19 05:35 PM I'll have to keep tha charged transmissionline pulser idea in mind. 01-Jul-19 05:59 PM Which charged transmission line pulser, technically all of the above are lol (though I assume you mean the transistor one) 01-Jul-19 06:32 PM Yeah that 01-Jul-19 06:32 PM And in general that it can be done. Which was new to me. 01-Jul-19 06:57 PM Yeah lol, I was surprised when I learned it worked like that as well. Very neat little trick not well known. 01-Jul-19 08:34 PM How high of a voltage can I go up to for DC charging a RG8 cable before I need to consider oil insulation? 01-Jul-19 08:34 PM I am fine with wrapping everything in Kapton and space adjacent lines away with some bulk insulation material. I hope at least that will handle up to 34 kV 01-Jul-19 08:36 PM What specific part are you talking about? Air insulated 34kv is doable 01-Jul-19 08:36 PM Are we talking termination or the rg8 itself? 01-Jul-19 08:38 PM Because in a transmission line pulser, as the pulse is travelling down the line there can be significant potential difference between the ends of one cable. If I have a really long cable and coil it into a solenoid then there might be a chance of an arc over when it is charged 01-Jul-19 08:40 PM I would just make sure the output ends are at far enough distance to prevent arcing 01-Jul-19 08:40 PM But RG8 should be able to handle 34kv DC 01-Jul-19 08:44 PM Also, you mentioned at the end of the transmission line connections are made using copper foil and wires, why is that necessary? Since the pulser is a transmission line anyway why not directly connect it (crimp/solder with adequate spacing for insulation) to the load? 01-Jul-19 08:44 PM Finally, to avoid an impedance mismatch anywhere in the system, can you use the high voltage HN-type connectors on the ends of the cables? I know they might not be rated up to this kind of voltage in high frequency operation but so is the RG-8 cable itself. 01-Jul-19 08:51 PM HN connectors will definitely break down at that voltage. I used copper foil and wires for the charging side mainly, though occasionally at the load side as it's not always easy to directly connect to the load. Cable pulsers are very easy to direct connect, but a bunch of the stripline pulsers I made were a challenge due to geometry. Yeah there will be some impedance mismatch, but it's not terrible if the connections are not super long. 01-Jul-19 08:51 PM If you want though you can submerge it in oil, I did that for the 25kv cable pulser driving the linac test injector. Doesn't hurt to have extra insulation, though the oil was messy and a pain to work with. 01-Jul-19 08:51 PM I also used wires a lot to connect to the spark gap switch, which in certain geometries was too difficult to direct connect. 01-Jul-19 08:54 PM I see. Well I really don't want to deal with more oil insulated high voltage stuff at the moment. Recently took apart the 34kV supply and the HV side is all immersed in this old oil and it was really messy 01-Jul-19 08:55 PM And our pressurized spark gap switch was, well, interesting lol. It worked fantastic, but not the greatest geometry. 01-Jul-19 08:55 PM Yeah, and certain oils can eat plastics 01-Jul-19 08:55 PM Diala AX is nasty stuff lol 01-Jul-19 08:55 PM Huh, which pressurized spark gap is this? (if you can say it) 01-Jul-19 08:56 PM It was the white one with the pressure gauge in my office 01-Jul-19 08:56 PM Ah! I don't know its interior geometry though 01-Jul-19 08:56 PM I made connections to it literally by taping the wires to the metal connections 01-Jul-19 08:56 PM Internally it is slightly tapered to allow for printing and high pressure operation. The gap just uses 1/2" brass bar rounded at the ends 01-Jul-19 08:56 PM Larry probably has the CAD still, the body was his design. Works fantastically, been up and down to 80 psi countless times, never leaked or any signs of stress. Thing is built solid af lol 01-Jul-19 08:56 PM I still use that gap when needed. If you want you can use it to test your cap stuff or triggering. There is a tapped hole on the side for a trigger if needed, though I normally just run it in self breaking mode 01-Jul-19 09:05 PM Sure! I'll keep that in mind 07-Jul-19 05:44 PM Still need to test what pressure they are pumping down to (and get some measuring hardware to do that) but at $35 each these D2,5E pumps seem like they were a pretty good score: https://i.gyazo.com/cc650c1ee9ff876704f1f667581f3c98.jpg 07-Jul-19 05:44 PM Not too dirty inside, both the motors work, and the rotors turn pretty easily by hand when turning over the pumps. 08-Jul-19 12:08 AM heh, that's the one I have! 08-Jul-19 12:09 AM Only unfortunate part is the 230/240v motors (and UK plugs) but I already have 240 in my garage where this stuff will probably live. 08-Jul-19 12:18 AM that's great, as we have 230V here as a standard 12-Jul-19 08:57 AM Well, here it is, the piece I revealed today - a full blown linac beam injector I am rebuilding and converting into EXEDA! 12-Jul-19 08:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Linac_Injector_-_Full_Gun_Assembly-12876.jpg 12-Jul-19 08:57 AM Water bottle for size reference: 12-Jul-19 08:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Linac_Injector_-_Size_Reference-D65C0.jpg 12-Jul-19 08:57 AM I'm stripping the whole thing bare and building the inside from scratch 12-Jul-19 09:15 AM yay pictures 12-Jul-19 09:20 AM Insides will be next week lol 12-Jul-19 09:24 AM goddamn tease 12-Jul-19 09:27 AM Lol its gonna be a long tease process 12-Jul-19 09:27 AM I haven't even revealed what type of accelerator I'm building (at least openly) 12-Jul-19 09:27 AM That won't be for a while though 12-Jul-19 09:27 AM Plenty of other things before then 12-Jul-19 12:07 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190712_200554-8A995.jpg 12-Jul-19 12:07 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190712_200530-A48B4.jpg 12-Jul-19 12:07 PM let there be light! 13-Jul-19 01:34 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190713_101539-F122B.jpg 13-Jul-19 03:18 AM oooooh 14-Jul-19 12:21 PM Got this pile of random swagelok and servos and stuff 14-Jul-19 12:21 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190714_122026-F6201.jpg 14-Jul-19 12:21 PM for $120 14-Jul-19 12:21 PM Some of them are food processing connectors (tri-clamp, which looks just like KF) 14-Jul-19 12:21 PM But then there's a valve that says high vacuum on it 14-Jul-19 12:21 PM So maybe some of it is actually KF? 14-Jul-19 12:32 PM Maybe, in my experience the food stuff is built to imperial standards so the dimensions just don't quite match up 14-Jul-19 12:33 PM the model number on the vacuum valve is XLH-16 so I thought it was probably KF-16 14-Jul-19 12:33 PM (it also looks like KF-16) 14-Jul-19 12:33 PM I can't really imagine what the machine was that had all this crap in it 14-Jul-19 12:33 PM (the seller mentioned that it was all from one machine) 14-Jul-19 12:34 PM Yeah it looks like quite the collection of parts 14-Jul-19 12:35 PM I just mean what application has both vacuum stuff and tri-clamp 14-Jul-19 12:35 PM maybe a freeze dryer? 14-Jul-19 12:35 PM Maybe they just tried to mash it all together? 14-Jul-19 12:36 PM like the designer didn't know the difference or something? 14-Jul-19 12:36 PM Or they just used what they had on hand? 14-Jul-19 12:36 PM yeah maybe 14-Jul-19 12:36 PM it looks like it came out of a factory though (pretty dirty) 14-Jul-19 12:36 PM so I wouldn't expect it to be fabricobbled like the stuff in research 14-Jul-19 12:52 PM Did it look like it was made to be food grade? 15-Jul-19 12:52 AM omnomnom 18-Jul-19 01:45 PM https://gigabecquerel.wordpress.com/2019/07/18/how-to-copper-plate-everything/ 19-Jul-19 02:10 PM Did you just use a sweet and low packet or were you able to find pure Saccharine? The packets have small amounts of other things in them. 19-Jul-19 02:14 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190719_231353-4120B.jpg 19-Jul-19 02:14 PM was like 5 bucks Off ebay 19-Jul-19 02:37 PM but it also worked with sweetener pills 19-Jul-19 02:37 PM 2 to 3 in 700 ml I think I used 19-Jul-19 02:53 PM oh btw 19-Jul-19 02:53 PM do not try it 19-Jul-19 02:53 PM it is just... too sweet 19-Jul-19 03:11 PM lol 19-Jul-19 05:16 PM I want to try it with nickel plating. I have been having a hard time getting fine bright grain. 19-Jul-19 09:25 PM I have a copper electroplating setup and I found that constant filtration with a circulating pump gave me much better plating quality. 19-Jul-19 09:25 PM Sacrificial anode would shed bits of copper which would stick to my part I was plating. 19-Jul-19 09:50 PM good to know 05-Aug-19 06:19 AM https://twitter.com/GigaBecquerel/status/1158366770924871680 06-Aug-19 06:29 AM woohoo, first signs of life from my cryo ❤ couple of minutes on compressed air and it's getting noticeably cold 06-Aug-19 08:07 AM In case anyone is wondering what silicon drift x Ray detectors actually look like 06-Aug-19 08:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190805_164048-7ED2A.jpg 06-Aug-19 08:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190805_164217-15DF8.jpg 06-Aug-19 08:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190805_164235-E56B8.jpg 06-Aug-19 08:10 AM while you distract them I'll empty their booth! 06-Aug-19 08:11 AM They also have a bunch of MCPs and other SEM centric detectors 06-Aug-19 08:11 AM I'll take that as a "yes!" 06-Aug-19 12:43 PM Shiny 07-Aug-19 11:43 AM Some vacuum porn, in case if you love really big pumps 07-Aug-19 11:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_2722-9BB53.JPG 07-Aug-19 11:54 AM That are Pfeiffer Roots 6000 pump after Roots 2000 pump after UNO 630 pump. Result - 10-3 torr at 6000 m3/h. Total weight ~2,5 tonns. 07-Aug-19 12:55 PM Nice, thet's some big pumps. 07-Aug-19 01:13 PM Now you can see a quite thick foreline (about 50m long). There were 3 pump sets on it, so total pumping speed was about 18 000 m3/h 07-Aug-19 01:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_2731-A9326.JPG 07-Aug-19 01:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_2740-B00DC.JPG 07-Aug-19 01:13 PM main diameter is 50 cm 07-Aug-19 01:29 PM Makes those ISO flanges look tiny in comparison 07-Aug-19 02:15 PM Dang... 07-Aug-19 05:04 PM 50cm sounds insane 07-Aug-19 05:04 PM Why so large for vacuum (i.e. nothing)? 07-Aug-19 05:17 PM Throughput 07-Aug-19 05:17 PM Pumping speed specifically 07-Aug-19 05:17 PM There's a reason turbomolecular pumps don't stop at palm-sized 07-Aug-19 05:17 PM Otherwise we could suck down entire chambers with a handheld turbo in minutes 07-Aug-19 05:17 PM Pumping speed is reduced linearly with length, but inversely proportional to diameter^3 07-Aug-19 05:17 PM ish 07-Aug-19 05:17 PM https://vacaero.com/information-resources/vacuum-pump-technology-education-and-training/1025-conductance-in-vacuum-pumping-systems.html 07-Aug-19 05:17 PM Here @nmz787 07-Aug-19 11:14 PM oh jeez 08-Aug-19 11:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190808_193751-502D1.jpg 08-Aug-19 11:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190808_191400-72837.jpg 08-Aug-19 11:11 AM Still using air? 08-Aug-19 11:13 AM Nope! 08-Aug-19 11:14 AM -100 is not particularly low, even for atmosphere 08-Aug-19 11:14 AM did you dry the innards? 08-Aug-19 11:14 AM any moisture left in the system will cripple it 08-Aug-19 11:14 AM -100 was not the final temp 08-Aug-19 11:14 AM with self-contained cryocoolers(for thermal cameras and whatnot) a whiff of water destroys them 08-Aug-19 11:14 AM :< 08-Aug-19 11:15 AM last time we checked we were at -130 08-Aug-19 11:15 AM -130 is pretty good 08-Aug-19 11:15 AM might just be inertia 08-Aug-19 11:17 AM yeah thing is pretty huge 08-Aug-19 11:17 AM easily 100g copper on the stages 08-Aug-19 11:17 AM get some baffles and you'll pump several thousand liters per second! :P 08-Aug-19 11:17 AM and at least 200 g lead in the second stage 08-Aug-19 11:17 AM not using it for pumping 08-Aug-19 11:18 AM making liquid gas? 08-Aug-19 11:41 AM That's the goal 08-Aug-19 11:42 AM Getting below LN2 or LHe temps will be fun 08-Aug-19 02:37 PM below LN2 is the goal, below LHe is not possible with this thing 08-Aug-19 02:37 PM as there are 16 bar of He in it 08-Aug-19 02:43 PM If you get close to LHe, try doing dilution cooling 08-Aug-19 02:43 PM Getting isotopically pure He would be hard 08-Aug-19 02:43 PM But I'm certain no hobbyist in the world has ever made that work 08-Aug-19 02:45 PM and I'm not going to 08-Aug-19 02:45 PM I know way too little thermodynamics for that 08-Aug-19 02:45 PM just enough to fabricoble a second stage for my pump 08-Aug-19 02:46 PM You just sort of 08-Aug-19 02:46 PM dump the two together 08-Aug-19 02:46 PM magic happens and it gets cold 08-Aug-19 02:46 PM make one evaporate 08-Aug-19 02:46 PM stuff like this 08-Aug-19 02:46 PM but the details... 08-Aug-19 02:49 PM the simpler a physics concept looks, the more complicated it is 08-Aug-19 02:49 PM as always 08-Aug-19 04:16 PM Adiabatic demagnatisation looks like a good way to get lower temperatures. If you can generate quite a strong magnetic field. 08-Aug-19 04:16 PM 4K right down to tens of millikelvin. 08-Aug-19 04:16 PM And if you can get below the helium inversion pont you can JT cool with it to get liquid He. 08-Aug-19 04:16 PM So if you can reach 20K ish there is a pathway to get to millikelvin. 08-Aug-19 04:28 PM Actualy, my memory is off, inversion point at 43K, so anything substantially below that will cool. 09-Aug-19 01:48 AM Sorry for being really absent recently. I have been... Busy. 09-Aug-19 01:48 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190808_183252-EE73E.jpg 09-Aug-19 01:48 AM (those are almost literally all scope crates in case you were curious) 09-Aug-19 02:24 AM take two for me 09-Aug-19 02:24 AM a TEM and hmmm an NMR? i'm ok with refurbished stuff 09-Aug-19 06:28 AM aaand we've got liquid air! 09-Aug-19 06:50 AM Now snort some 09-Aug-19 09:34 AM pulverized solid air crystals 09-Aug-19 10:25 AM @Deleted User thanks for the article on conductance, will need to revisit it after my first read sinks in a bit! 09-Aug-19 05:06 PM Vintage Swiss 09-Aug-19 05:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0516-B5E3C.jpg 09-Aug-19 05:06 PM unfoutenately, two of the hand cranks shattered during shipment... that's what you get for bakelite/pre-bakelite 09-Aug-19 05:06 PM so, this is just a fancy radius dresser for pivot 'polishing' machines 09-Aug-19 05:20 PM Any word on larger bits of equipment? 09-Aug-19 05:21 PM they checked for me a week ago when rescheduling this delivery.. and they said it would likely shiop out from chicago on wednesday or saturday.. I'll give them a ring on monday for any updates 09-Aug-19 05:21 PM one week left of school,so, even if I say: give it to me friday.. I'll basically have a month (well, not practically, but logically) to get it inside 09-Aug-19 05:21 PM talked to the delivery guy a little, he said just a pallet jack 09-Aug-19 05:21 PM he was able to push this lil guy (sub 200#) up the drive way, and half cringed of the thought of lowering his lift gate onto a raised patio 09-Aug-19 05:21 PM I mentioend the other methods in mind, and he basically nodded 10-Aug-19 08:12 AM Just got a turbo + controller with no visible damage to the turbines for $80 10-Aug-19 08:19 AM That is an insanely sweet deal 10-Aug-19 08:35 AM https://www.idealvac.com/Alcatel-Drytel-31-Turbo-Drag-Dry-High-Vacuum-Pump-System/pp/P101083 10-Aug-19 08:35 AM It's that one ^ 10-Aug-19 08:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20190810_084741-D5AF4.jpg 10-Aug-19 08:47 AM It has a built in dry piston pump 10-Aug-19 08:47 AM I can't believe I got it this cheap 10-Aug-19 08:53 AM That’s a cute little system. Hope the bearings are good. 10-Aug-19 09:04 AM the turbo bearings seem alright (spinning them with fingers) but maybe it's hard to tell when it's not under load; not sure about the piston pump but I have a dual rotary vane pump I could use instead (at the cost of not having a dry vacuum) 10-Aug-19 09:30 AM spin it up a little 10-Aug-19 09:30 AM it won't hurt the turbo to run it up to 1-2krpm 10-Aug-19 09:30 AM but not further 10-Aug-19 09:30 AM the input surface is surprisingly tiny 10-Aug-19 09:30 AM a sliver of blades 10-Aug-19 09:32 AM yeah I think it's technically a turbodrag pump 10-Aug-19 09:32 AM the drag stage happens at the bottom 10-Aug-19 09:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/n-o-dsc-6572-rgb1-3AFF0.png 10-Aug-19 09:32 AM the black cylinder bit is a drag stage 10-Aug-19 09:32 AM howleck pump 10-Aug-19 09:32 AM I really want to see a turbomolecular pump that can vent to atmosphere 10-Aug-19 09:32 AM It's theoretically possible, practically too, but nobody's ever done it because it's a bit silly 10-Aug-19 09:32 AM sticking a tapering side channel pump on the bottom of a drag stage would probably allow a turbo to vent to atmosphere 10-Aug-19 09:32 AM if only I had a high precision 6-axis CNC machining center :P 10-Aug-19 09:32 AM I find it funny that wikipedia mentions a diffpump as a backing pump for a turbo 10-Aug-19 11:53 AM Sometimes they used diffusion booster pumps back in the day for high volume but relatively high ultimate pressure mechanical pumps. Lobe pumps come to mind. Especially with molecular drag pumps and especially when pumping hydrogen as drag and turbo pump throughputs for hydrogen drop pretty sharply. Hydrogen becomes a problem when all of your parts have been hydrogen reduction fired prior to assembly. 10-Aug-19 01:17 PM disassembled.. 10-Aug-19 01:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0517-D8D00.jpg 10-Aug-19 01:17 PM maybe one dovetail 'cross slide' (not really) left to take apart, but yeah, not bad thus far (well, it was completely not operational before, too much grime inhibitting free movement) 10-Aug-19 01:17 PM something like 7 moveable/bearing points 10-Aug-19 01:17 PM two arent adjsutabel via knobs, the rest are (one is a handle, for the main pivot) 10-Aug-19 01:17 PM glad I have a surface plate to rescrape it all 10-Aug-19 01:17 PM going to be my first real rebuild 10-Aug-19 01:17 PM (the other thing, the end 'user' machine of what comes out of this one, was simply cleaned up and relubed, nothing physically altered) 10-Aug-19 03:32 PM I ran the pump open to the atmosphere for about 30 seconds 10-Aug-19 03:32 PM spun up to a high RPM and then spun down 10-Aug-19 03:32 PM (I put it outside and closed the door so there was at least 1/4" of glass between me and the spinning stuff) 10-Aug-19 03:40 PM 30 seconds is way too long 10-Aug-19 03:40 PM that could've caused some damage 10-Aug-19 04:10 PM Yeah normal out of vacuum spin up is maybe a few seconds. Just enough to make sure you don't hear any nasty scraping sounds 10-Aug-19 04:10 PM Lol firmware dev can be hard 10-Aug-19 04:14 PM that's why I built my own controller and wrote my own code 10-Aug-19 04:14 PM I can spin the turbo in air 24/7 at anywhere from 1Hz to infinity 10-Aug-19 04:15 PM More like how there was a bug in a new version of a fairly mature control logic 10-Aug-19 04:15 PM And the thing did not open the valve to the chamber before prepumping and then spinnign up the turbo 10-Aug-19 04:15 PM and when the turbo hit 1000Hz (with 1800Hz being the max speed, what ever it is) 10-Aug-19 04:15 PM It opened the damn valve 10-Aug-19 04:15 PM One of the nastiest sounds i have heard a turbo make. 10-Aug-19 04:15 PM It did not die tho. 10-Aug-19 04:17 PM the chamber just wanted a way out of this world 10-Aug-19 04:17 PM it didn't die on a vent? 10-Aug-19 04:17 PM Likely still being used to test firmware 10-Aug-19 04:17 PM Yea we got lucky 10-Aug-19 04:17 PM The thing survived. 10-Aug-19 04:18 PM a little more than lucky 10-Aug-19 04:18 PM though my tph-060 survived taking a chunk out of my finger 10-Aug-19 04:18 PM :x 10-Aug-19 04:19 PM and that's how I was motivated to implement the powered deceleration feature 10-Aug-19 04:19 PM Yeah I wish pheiffer controller had it, or that the firmware folks had implemented it as a command, if it has that. 10-Aug-19 04:20 PM it's stupid easy to build custom controllers for turbos 10-Aug-19 04:20 PM $10-30 in COTS parts 10-Aug-19 04:20 PM 2, 3, or 4 phase 10-Aug-19 04:22 PM @Deleted User uhm... please tell me more?` 10-Aug-19 04:22 PM i have... let's say, some turbo pumps without controller 10-Aug-19 04:23 PM step 1: look for a manual or otherwise find a way to determine the type 10-Aug-19 04:23 PM how many phases, in what configuration, and whether it's sensored 10-Aug-19 04:23 PM (it likely is) 10-Aug-19 04:23 PM step 2: if it's 2 or 4 phase, build a simple mosfet driver for 2 or 4 phases, put some generic fets in, some suppressors and BEMF diodes 10-Aug-19 04:23 PM step 2.5: if it's 3ph, just use a generic RC airplane brushless motor ESC lol, you're done 10-Aug-19 04:24 PM I wonder if an ESC for brushless motors would work. Like the drone folks use. 10-Aug-19 04:24 PM step 3: hook up the feedback and correlate the phase offset 10-Aug-19 04:24 PM yes, they do, but only for 3ph turbos 10-Aug-19 04:24 PM Ah you ware faster 10-Aug-19 04:24 PM a lot of older turbos are 2 or 4ph 10-Aug-19 04:25 PM hmh... i have for example two of the older type pfeiffer with the two symmetrical turbos 180° apart 10-Aug-19 04:25 PM i have no idea what motor they use, but definitely no controller for them :-D 10-Aug-19 04:26 PM what's the model number? 10-Aug-19 04:26 PM an older pfeiffer with two coils 180deg apart is probably a tph-055 10-Aug-19 04:26 PM in which case it's driven by hall effect sensors, and with some dumb luck you should be able to get away with literally 0 code running on the system(though that's advised against) 10-Aug-19 04:26 PM comparator A goes into phase B, comparator B goes into phase A 10-Aug-19 04:26 PM with 4ph it's the same, but you just offset ABCD by 90 degrees, or -90 if you want to decelerate using the power input(handy) 10-Aug-19 04:28 PM TPH 330 or 270 look like mine 10-Aug-19 04:28 PM oh, those old dinguses 10-Aug-19 04:29 PM yup 10-Aug-19 04:29 PM huh 10-Aug-19 04:29 PM well, here's the datasheet 10-Aug-19 04:29 PM https://www.idealvac.com/files/manualsII/Pfeiffer_TPU-330_TPU-510_Manual.pdf 10-Aug-19 04:29 PM around page 20ish you will see the pinouts 10-Aug-19 04:29 PM see if any of them correlate with yours 10-Aug-19 04:29 PM looks like yours is also 4-phase, in which case you could just copy my design and code, though I imagine you'd have to switch up the power section since yours is much beefier 10-Aug-19 04:43 PM ohhhh, Anleitung zum Prüfen des Antriebes - nice! didn't realize that old datasheet is so informative 10-Aug-19 04:44 PM no it isn't 10-Aug-19 04:44 PM trust me 10-Aug-19 04:44 PM the only useful thing is the pinout and the mechanical description 10-Aug-19 04:44 PM electrical is ALL LIES 10-Aug-19 04:44 PM oh. ok 10-Aug-19 04:44 PM none of the waveforms that come out of the pump look like the ones in the datasheet 10-Aug-19 04:44 PM but the pinouts are great 10-Aug-19 04:47 PM in todays datasheets even pinouts are omitted 10-Aug-19 04:47 PM only "if doesn't work, send to manufacturer for repair" 10-Aug-19 04:48 PM @Deleted User I'm not sure it was actually 30 seconds, might have been shorter 10-Aug-19 04:48 PM also "The turbo drag pump is very robust and student friendly, they can be opened to atmosphere at full speed without damage to the pump (this is not possible with a turbo molecular high vacuum pump). " is a quote from the IdealVac page 10-Aug-19 04:48 PM so it's just a turbodrag? 10-Aug-19 04:48 PM huh 10-Aug-19 04:48 PM that is interesting, I've never seen one 10-Aug-19 04:48 PM do pull it apart and take pretty pictures. 10-Aug-19 04:50 PM yeah I probably will 10-Aug-19 04:51 PM can probably provide pictures of another turbo drag pump some time in the future. have one lying around in storage, of course without controller. but now that i can annoy @Deleted User with stupid questions about controller design, that should be no problem... :-D 10-Aug-19 04:51 PM if you have more than one, I can trade for a controller ;) 10-Aug-19 04:53 PM more than one of what? i own only one turbo drag pump, but quite some turbomoleculars. all in bad shape, all need thorough cleaning, some need new bearings, don't know if i want to get rid of some or just keep them as fancy paperweights. :-D 10-Aug-19 04:55 PM I want a functional one that has a couple whiffs of life left in it 10-Aug-19 04:55 PM enough to have a scary accident once and then put away 10-Aug-19 04:55 PM or pull the housing off and make a desk fan 10-Aug-19 04:55 PM but yeah, most controllers are really simple 10-Aug-19 05:22 PM nice. thanks! 11-Aug-19 04:04 AM https://gigabecquerel.wordpress.com/2019/08/11/repairing-and-testing-a-gm-cryocooler/ 11-Aug-19 04:04 AM https://www.youtube.com/watch?v=CUCxXJjO_4U so cool 11-Aug-19 08:45 AM Oh that's so cool. 11-Aug-19 08:45 AM Much faster pumping than I'm used to. 11-Aug-19 08:45 AM The sumitomos I have experience with ware much lazier, even on 60Hz AC. 11-Aug-19 09:02 AM this one does even faster pumping on 60 Hz 11-Aug-19 09:02 AM iirc 2 Hz at 50 and 2.4 Hz at 60 Hz? 11-Aug-19 09:02 AM resulting in 11-Aug-19 09:02 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-067E7.png 11-Aug-19 09:02 AM I have the RGD 510 11-Aug-19 09:02 AM an RGS 120 would be awesome in my case, but that's just not what I have 11-Aug-19 09:02 AM tho a friend is designing their own cold head made for liquefying air, sooo... ^^ 11-Aug-19 11:08 AM That is neat! 11-Aug-19 11:08 AM I really want a helium compressor, but there's almost none available in this region, and shipping one from the US or far EU would cost me an arm and a leg, even if they're under $100 11-Aug-19 11:08 AM Now you need a zeolite nitrogen separator and dryer. 11-Aug-19 11:08 AM If you can find an oxygen concentrator, just sticking the output hose on the discharge line will get you almost pure nitrogen. 11-Aug-19 11:10 AM I already have one 11-Aug-19 11:10 AM but I need a He compressor, the one I used for testing is not mine 11-Aug-19 11:11 AM I wonder if it's feasible to DIY one 11-Aug-19 11:11 AM pretty sure it is 11-Aug-19 11:11 AM Since it doesn't need to be super precise, like a cryocooler head 11-Aug-19 11:11 AM at least I hope, as my plan is to build one 11-Aug-19 11:12 AM The biggest issue you'll be facing is that you'll need a lot of UHP helium :P 11-Aug-19 11:12 AM It'll leak. A lot. Constantly. 11-Aug-19 11:12 AM Because helium does not want to be contained 11-Aug-19 11:12 AM it works well with commercial compressors 11-Aug-19 11:12 AM and 4N He 11-Aug-19 11:13 AM Yeah, they just need top ups constantly to maintain efficiency 11-Aug-19 11:13 AM Though I'm not sure on the range of pressures 11-Aug-19 11:13 AM I know they operate best at around 20-30 bar 11-Aug-19 11:13 AM yes, it will leak, but 16 bar is a lot 11-Aug-19 11:13 AM Though 20-30 bar might be an embedded cryocooler pressure 11-Aug-19 11:13 AM 16 bar equilibrium, ~20 bar high side and ~4 bar low side when working 11-Aug-19 11:14 AM Yep, makes sense it'd be lower for a big system 11-Aug-19 11:14 AM all I need to get LN2 is a dewar, can just go pick it up from local supply if I have my own container :P 11-Aug-19 11:14 AM I wish I'd jumped on the Hybrid 98 deals that were around before they became wildly popular and exploded 11-Aug-19 11:14 AM though I'm still too cheap to buy a dewar 11-Aug-19 11:14 AM Now they're like $1k a piece 11-Aug-19 11:15 AM oof 11-Aug-19 11:15 AM For your nitrogen source https://hgrinc.com/productDetail/Air-Handling/USED-PARKER-NITROGEN-GAS-GENERATOR/02190810005/ 11-Aug-19 11:16 AM Access Denied - Sucuri Website Firewall If you are the site owner (or you manage this site), please whitelist your IP or if you think this block is an error please open a support ticket and make sure to include the block details (displayed in the box below), so we can assist you in troubleshooting the issue. 11-Aug-19 11:16 AM He's not in the US 11-Aug-19 11:16 AM Buying from HGR is nearly impossible 11-Aug-19 11:16 AM https://images.hgrinc.com/inventory/0219/0219081/20190226111148802_L.JPG 11-Aug-19 11:16 AM $44 11-Aug-19 11:16 AM and $4400 in shipping 11-Aug-19 11:16 AM :P 11-Aug-19 11:16 AM it's a pressure swing absorption generator 11-Aug-19 11:16 AM nothing worth shipping 11-Aug-19 11:16 AM just two tubes full of 3A zeolite 11-Aug-19 11:16 AM or 4A 11-Aug-19 11:17 AM https://www.ebay.de/itm/192689299105 11-Aug-19 11:17 AM yep, that's a great option 11-Aug-19 11:17 AM now if there wasn't shipping... 11-Aug-19 11:17 AM yep 11-Aug-19 11:17 AM that's not a great option 11-Aug-19 11:17 AM :~; 11-Aug-19 11:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/s-l1600-40C3E.png 11-Aug-19 11:17 AM looks like they're just fancy fridge compressors inside 11-Aug-19 11:18 AM not even fancy 11-Aug-19 11:18 AM just watercooled 11-Aug-19 11:18 AM and looooots of oil filtering 11-Aug-19 11:18 AM too bad fridge compressors are literally the worst in terms of oil production 11-Aug-19 11:18 AM I wonder if a scroll compressor would work for this 11-Aug-19 11:20 AM that's actually wanted in this case, as the oil is separated off and cooled, before it's reintroduced in the compressor 11-Aug-19 11:20 AM scrolls are fast, powerful, relatively quiet, and have much less oil 11-Aug-19 11:20 AM and are a bit easier to chill 11-Aug-19 11:20 AM though I don't know if they can reach 20 bar 11-Aug-19 11:21 AM the oil is important for cooling 11-Aug-19 11:22 AM so regular cooling is not sufficient for pushing helium around? 11-Aug-19 11:22 AM seems like it 11-Aug-19 11:22 AM the compressor wrapped in a water cooling jacket, the outgoing gas is cooled, as well as the oil 11-Aug-19 11:23 AM could be interesting to cut the bottom off and put in a radiator internally 11-Aug-19 11:23 AM circulate water directly through the oil 11-Aug-19 11:23 AM just a huge snake of copper tube with some fins welded on 11-Aug-19 11:23 AM or brazed on 11-Aug-19 11:26 AM might work 11-Aug-19 11:26 AM That can be done, but you have to remember that when you put them next to eachother like that contamination can happen 11-Aug-19 11:26 AM but that would require special compressors => even higher price 11-Aug-19 11:31 AM no I mean just cutting the bottom off a fridge compressor 11-Aug-19 11:31 AM below where the motor sits 11-Aug-19 11:31 AM that's where the oil goes 11-Aug-19 11:31 AM still, higher price 11-Aug-19 11:32 AM aren't you going to be using a fridge compressor? 11-Aug-19 11:32 AM I've got the original compressor and adsorber from a compressor unit 11-Aug-19 11:33 AM oh 11-Aug-19 11:35 AM yep ^.^ 11-Aug-19 06:24 PM They have 5 liter dewars from China on eBay for around $100 or a bit more. I got one. Your local welding supply place should be able to get you set up. You will need an account, but it’s not that hard to set up. The only thing is they will need to “proof” your dewar before they really fill it. Typically they will put some in, let it evaporate, which does not take long cause it’s warm from being empty. Then fill it a fair amount and check it. Dump that out and check it again, then they will put a serial number sticker from their company telling future people there it’s ok to fill. At least that’s how it was for mine, but I already buy my welding gasses from them so they knew me and that I do crazy things. 12-Aug-19 01:39 PM Man @GigaSquirrel your making me need to poke at my cryo stuff... 12-Aug-19 01:39 PM Maybe I should poke at the one head I have tonight that I got from HGR as a unit 12-Aug-19 01:39 PM its used to make cool air... but I can take the conflat housing off it and see whats inside :) 12-Aug-19 01:43 PM don't yiu have a cryo and compressor? 12-Aug-19 01:47 PM I do have heads and compressors. I didn't have lines. I have one new line and some old crusty lines now... 12-Aug-19 01:47 PM I don't have a bottle of helium nor do I have the adapters to fill the system... 12-Aug-19 01:47 PM Now all of my stuff reads having pressure in them, but that could be pressurized air... some shipping gas... helium... I dunno 12-Aug-19 01:47 PM So yea may just try hooking everything up and giving it a try because yolo 12-Aug-19 01:47 PM I also need to adapt some connectors for some of the heads if I want to use them 12-Aug-19 01:47 PM Electrical connectors that is 12-Aug-19 01:47 PM to power the stage in the pump head. 12-Aug-19 01:47 PM I really dunno how I am going to find the adapters to fill my systems if I need to 12-Aug-19 01:56 PM By the way, does anybody have any service manuals for this machines? 12-Aug-19 01:57 PM https://www.ebay.com/itm/New-Trillium-Cryogenic-Maintenance-Manifold-PN-10134-CTI-PN-8032051G001/264249721297 12-Aug-19 01:57 PM Need one of these 12-Aug-19 03:11 PM it's not terrible if you run it with air 12-Aug-19 03:11 PM pretty sure it's shipped with He 12-Aug-19 03:11 PM just try it 12-Aug-19 03:11 PM plus you can fill it with He via the Gas Return port 12-Aug-19 03:28 PM Right but with what? I would need an adapter from the connectors they use on these things to something else... A connector I don't even know the name of :) 12-Aug-19 03:28 PM Or I'd have to make an adapter which would be a horrid cludge lol 12-Aug-19 03:28 PM But hrm so you can run them on Air? The HE compressor won't get angry at you? 12-Aug-19 03:28 PM are you looking for the electrical adapter or the gas connector? 12-Aug-19 03:29 PM Gas connector is what I was talking about 12-Aug-19 03:29 PM Electric is easy, AFAIK most heads are 120V AC 12-Aug-19 03:29 PM Though the manuals ussually say 12-Aug-19 03:29 PM "aeroquip" is what you're looking for 12-Aug-19 03:29 PM some can be 3 phase apparently for lower vibration 12-Aug-19 03:30 PM plus running them with air is no issue at all, you just can't reach as low temps 12-Aug-19 03:30 PM aeroquip is a brand? 12-Aug-19 03:30 PM Oh ok cool! Good to know I can at-least test like that 12-Aug-19 03:30 PM I guess just aeroquip helium fittings 12-Aug-19 03:31 PM aeroquip 5400 series iirc 12-Aug-19 03:31 PM 1/2" 12-Aug-19 03:32 PM Awesome thank you, and lol 1/2" I guess thats the inside diameter measurement? 12-Aug-19 03:32 PM because my connector is like 1" diameter external 12-Aug-19 03:32 PM which is what I see on most cryos 12-Aug-19 03:32 PM or 3/4" something around that size 12-Aug-19 03:32 PM no idea what the size referes to, but my manual says it's 1/2" 12-Aug-19 03:32 PM yeah, those ~25mm OD connectors 12-Aug-19 03:32 PM yup something around there! 12-Aug-19 03:32 PM they are BIG haha 12-Aug-19 03:34 PM and so damn tight 12-Aug-19 03:34 PM friend of mine had a ~10cm long piece of pipe with a manometer on it and a aeroquip on each side 12-Aug-19 03:34 PM only a few ml in volume 12-Aug-19 03:34 PM took half a year to go from 16 to 15 bar 12-Aug-19 03:37 PM lol 12-Aug-19 03:37 PM https://s3-eu-west-1.amazonaws.com/resources.guyson.co.uk/product-downloads/eaton_aeroquip_5400_web_version.pdf?mtime=20161118140210 12-Aug-19 03:37 PM Also the relevant doc 12-Aug-19 03:38 PM Good to know I can get replacement parts 12-Aug-19 03:38 PM Though you know on their exploded diagram I don't see the flat rubber piece I see on the male side... 12-Aug-19 03:38 PM Erm maybe I'm remembering wrong 12-Aug-19 03:38 PM either way good thing to know I can get seals, because I think those will need to be replaced on some of my hoses and such 12-Aug-19 03:39 PM it's on top of 3 and 9 12-Aug-19 03:40 PM 3/10 I think you mean 12-Aug-19 03:40 PM both poppet valves 12-Aug-19 03:40 PM right 12-Aug-19 03:40 PM but I guess thats one whole assembly 12-Aug-19 03:40 PM suppose you just replace that entire thing... 12-Aug-19 03:40 PM Hrm ok, well I suppose I can hook one of these things up tonight and see what I can do 12-Aug-19 03:40 PM though I don't have any good thermocouples or anything hrm 12-Aug-19 03:41 PM iirc what they're threaded on is just M22x1.5 or 1.25 12-Aug-19 03:42 PM Like you mean between the aeroquip fitting and the hoses? 12-Aug-19 03:42 PM Not areoquip to aeroquip? 12-Aug-19 03:42 PM the cryo itself should have a M22 with the aeroquip just screwed onto 12-Aug-19 03:42 PM Ah yea ok 12-Aug-19 03:42 PM well actually it looks like aeroquip sells different styles 12-Aug-19 03:42 PM so it could vary between cryo to cryo 12-Aug-19 03:42 PM they also have braze on styles... 12-Aug-19 03:42 PM so its possible its brazed on too yay... 12-Aug-19 03:44 PM nothing an angle grinder can't fix 12-Aug-19 03:44 PM worst thing that can happen is that you loose like 20 bucks worth of He 12-Aug-19 03:44 PM worst thing that can happen is that you loose like 20 bucks worth of He 12-Aug-19 04:28 PM Is that all it costs to fill a closed cycle He cooler? 12-Aug-19 04:38 PM that's $20 of just helium 12-Aug-19 04:38 PM probably $40 for a refill 12-Aug-19 04:38 PM but if you want it to operate the right way with ultra high purity(99.999% or 99.9999%), then it's closer to around $50-100 for a full tank 12-Aug-19 04:38 PM of which you'll maybe use the $40 12-Aug-19 04:38 PM + waste 12-Aug-19 10:09 PM https://i.imgur.com/PqGJlNv.jpg 12-Aug-19 10:09 PM https://i.imgur.com/h5BM75i.jpg 12-Aug-19 10:09 PM https://i.imgur.com/Lgklc4o.jpg 12-Aug-19 10:09 PM https://i.imgur.com/B9pqVB1.jpg 12-Aug-19 10:09 PM Other than the stupid case raddling around it sounds great! 12-Aug-19 10:09 PM https://imgur.com/Wi4rr1l 12-Aug-19 10:09 PM You can hear the audio of it if you click the link 12-Aug-19 10:09 PM Again this is a weirdddd cryo head designed by Rigaku... 12-Aug-19 10:09 PM The entire thing is called the X-stream 2000 its for making air cold then passing it over something 12-Aug-19 10:09 PM Its to generate +4 to -180 C temp air... 12-Aug-19 10:09 PM But tbh I think making LN2 or something would be more fun 12-Aug-19 10:09 PM Guess I could have used it to remove moles... but eh... I don't have a good use for this so I'll probably hack up the cold end to try and get to the tip of it 12-Aug-19 10:09 PM Since I don't want to be doing Cryo-Crystallography, which is what this was intended for apparently? 12-Aug-19 10:21 PM I would def keep it for ln2 12-Aug-19 10:21 PM Very useful for sem stuff 12-Aug-19 10:21 PM Namely your cold trap 12-Aug-19 10:21 PM Also I like the bit of zep in the background 12-Aug-19 10:22 PM I mean I payed 130 bucks for the compressor and head and 10 bucks a piece for each helium hose, and apparently the hoses weren't pressurized but the system had enough in it that it only dropped to about 175~ PSI when hooked up so yea. 12-Aug-19 10:22 PM Same zep we got for the SEM lol 12-Aug-19 10:22 PM But yea I just have to get a dewer 12-Aug-19 10:23 PM So that head can't current produce nitrogen? 12-Aug-19 10:24 PM Well so thats the thing, do you see how it has an inlet hose and an outlet with a vacuum pulled insulator hose, or was vacuum pulled? 12-Aug-19 10:24 PM thats integrated into the cryo head... 12-Aug-19 10:24 PM its all brazed together 12-Aug-19 10:24 PM this isn't a modified cryo pump... this is a custom made cryo head by rigaku 12-Aug-19 10:25 PM Oh 12-Aug-19 10:25 PM I get it now 12-Aug-19 10:25 PM That interesting 12-Aug-19 10:26 PM yea it is... but also annoying because I don't know where to cut with my hacksaw to get to the ACTUAL cold head... 12-Aug-19 10:26 PM because there is no datasheet for this head... it only brings you the manual of the unit 12-Aug-19 10:26 PM You can't just flow n2 through it? 12-Aug-19 10:27 PM It would liquify near the head maybe? but I'd never get it out as liquid... 12-Aug-19 10:27 PM it would heat up too much by the time it got to the end of any of those lines... 12-Aug-19 10:27 PM I mean you realize this is only meant to flow AIR not generate liquid 12-Aug-19 10:27 PM Hm yeah 12-Aug-19 10:27 PM I'm just thinking if you could hack it 12-Aug-19 10:27 PM I still vote xray 12-Aug-19 10:28 PM I just need to hacksaw off the very bottom of the chamber I can get inside and see where it ends 12-Aug-19 10:28 PM If your cryo pump is producing x rays you have bigger problems 12-Aug-19 10:28 PM It might take multiple exposures but it should eventually show where the head is 12-Aug-19 10:28 PM Ah 12-Aug-19 10:28 PM No he means to Xray the stainless steel and copper end 12-Aug-19 10:29 PM I get it now 12-Aug-19 10:29 PM https://i.imgur.com/T8d8J7z.jpg 12-Aug-19 10:29 PM But yea if I cut the bottom off, on the right, I can hopefully see inside where the head starts 12-Aug-19 10:29 PM my little cancer-o-matic 9000 dental xray head :P 12-Aug-19 10:29 PM I'm guessing the head is right to the end of that copper but it could extend down into that stainless steel a bit too 12-Aug-19 10:29 PM I just thought this was a continuation of his never ending quest to iradiate everything 12-Aug-19 10:29 PM it is 12-Aug-19 10:30 PM Por que no los dos 12-Aug-19 10:30 PM Could you just cut the bottom tube off and let ln2 just drop out the bottom? 12-Aug-19 10:31 PM I suppose that could be reasonable 12-Aug-19 10:31 PM just need to feed nitrogen in backwards... 12-Aug-19 10:31 PM Yeah exactly 12-Aug-19 10:31 PM but it would also then have to cool ALLLLL that stainless steel down before it starts really making anything... 12-Aug-19 10:31 PM which could take a long time... 12-Aug-19 10:31 PM Just something quick and dirty 12-Aug-19 10:31 PM I'd rather get right at the tip of it to play with stuff lol 12-Aug-19 10:32 PM Lol fair 12-Aug-19 10:32 PM Also for the record cryo gas is useful as well 12-Aug-19 10:32 PM Also need a conflat 6" nipple with a desicant chamber at the bottom and a pump down port? lol 12-Aug-19 10:32 PM I mean... sure I guess? 12-Aug-19 10:32 PM I could become a crack doctor removing people's moles 12-Aug-19 10:32 PM or I could do cryo-crystallography 12-Aug-19 10:32 PM or I could hack it up 12-Aug-19 10:33 PM Cryo sem stage is usually cryo gas 12-Aug-19 10:33 PM I mean like litterally if you look this thing up all it is called is a cryo crystal cooler 12-Aug-19 10:33 PM why though? 12-Aug-19 10:33 PM shouldn't it just be a tube filled with LN2 or something? 12-Aug-19 10:33 PM seems silly to not just use LN2 12-Aug-19 10:34 PM Easier to get cold gas in than liquid that wants to expand 720 times 12-Aug-19 10:34 PM I mean I suppose 12-Aug-19 10:34 PM Especially when you need low vibration 12-Aug-19 10:34 PM ah... fair 12-Aug-19 10:34 PM I mean I already tore it down, I showed you this months ago and mentioned nothing of the sort :P 12-Aug-19 10:35 PM The low vibration part with liquid is really hard 12-Aug-19 10:35 PM I thought it was some weird useless thing 12-Aug-19 10:35 PM I wouldn't have cracked the seal on the conflat if I knew it had some use, I would have just gotten another cryo head 12-Aug-19 10:35 PM Most cryo sem stages just flow n2 through a dewer of nitrogen so 12-Aug-19 10:36 PM I don't have nor do I ever expect to have one of those pump down port tools since they are hard to find used and probably cost an arm and a leg new 12-Aug-19 10:36 PM So its pretty much done at this point lol 12-Aug-19 10:36 PM Oh no they are easy to make 12-Aug-19 10:36 PM if you have a lathe maybe 12-Aug-19 10:36 PM but it would require some good tolerences and orings 12-Aug-19 10:37 PM You just use a JEOL sample rod on a kf t 12-Aug-19 10:37 PM You know I believe I mentioned these things to you months ago and you also didn't mention this. 12-Aug-19 10:37 PM hrm 12-Aug-19 10:37 PM Maybe I should put it back together then, I do have a large enough opening in my SEM chamber to easily add a cryo stage probably lol 12-Aug-19 10:38 PM Yeah I figured this out recently 12-Aug-19 10:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190812_223936-F826C.jpg 12-Aug-19 10:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190812_223909-F9DCB.jpg 12-Aug-19 10:40 PM Ah nice and filthy oily 12-Aug-19 10:40 PM also I am pretty sure it wouldn't be too hard to just machine something with a double oring seal or something in it 12-Aug-19 10:40 PM I have seen some one use that same filed off kf thing I did on your sem to make the adapter 12-Aug-19 10:40 PM I just pulled this one from my spare parts 12-Aug-19 10:41 PM I just need to borrow a friend's lathe or something 12-Aug-19 10:41 PM Yeah 12-Aug-19 10:41 PM Same 12-Aug-19 10:44 PM Looks for dewers... 12-Aug-19 10:44 PM Finds EDS 12-Aug-19 10:44 PM https://www.ebay.com/itm/NORAN-LIQUID-NITROGEN-UNIT/183915373632 12-Aug-19 10:44 PM Or what I think is an EDS lol 12-Aug-19 10:44 PM yea ok I see the connector barely in the first photo 12-Aug-19 10:45 PM Oh god it's resting on the berelium end 12-Aug-19 10:45 PM no its hanging off the table in the 3rd photo 12-Aug-19 10:45 PM see table end for reference :P 12-Aug-19 10:46 PM I got one off eBay for 10$ recently 12-Aug-19 10:46 PM So that's 10x the deal 12-Aug-19 10:46 PM LOL 12-Aug-19 10:46 PM what EDS did you get? 12-Aug-19 10:46 PM Uh 12-Aug-19 10:46 PM Edax I think 12-Aug-19 10:46 PM One you can use or just a rando? 12-Aug-19 10:46 PM Ah ok 12-Aug-19 10:46 PM thats reasonably common 12-Aug-19 10:46 PM I assume its not an LN2 based one for you to have cared? 12-Aug-19 10:47 PM It was really close by 12-Aug-19 10:47 PM And I wanted a dewar 12-Aug-19 10:48 PM so you bought an EDS head to use as a dewer? 12-Aug-19 10:48 PM Yeah I was expecting the window to be dead 12-Aug-19 10:48 PM And like I already had 5 of them... 12-Aug-19 10:49 PM And the window wasn't dead? lol 12-Aug-19 10:51 PM Yeah no it was fine 12-Aug-19 10:51 PM So now I have 6 12-Aug-19 10:53 PM lol 13-Aug-19 12:29 AM I have 2 SiLi EDS detectors waiting to be shipped from the US to me.... eventually 13-Aug-19 12:29 AM I'll be trying to convert them to atmospheric(ish) peltier-cooled 13-Aug-19 12:29 AM I've seen results that show that at around -90C they produce very good results for what they need to be doing 13-Aug-19 12:29 AM (actual XRF, not SEM) 13-Aug-19 09:35 AM That sounds tough. 13-Aug-19 10:17 AM As are all unconventional things 13-Aug-19 10:45 AM Uhm, so I've been told you can't just convert detectors because the LN2 detectors are a different technology completely to the peltier cooled ones... 13-Aug-19 10:45 AM The ones that need LN2 kinda really need it. Also remember that peltiers don't do too many watts in a small location... So your going to be doing some weird thermal transfer with a block of copper I guess down to where you need cooled and to get the surface area. To get it cold enough you'll probably have to stack pelts, which at this point it gets extremely pricey and inefficient. And your going to have lots of heat to deal with. 13-Aug-19 11:01 AM The Amptek ones are a different technology. They use silicon PIN diodes. I've seen a description of a Si(Li) detector cooled with peltiers so it may just be possible. It's really hard to get peltiers to go that low. Some refrigerents will do -120C ish. I wonder if that's an option. 13-Aug-19 11:09 AM SiLi detectors can work from around -70Cish and lower 13-Aug-19 11:09 AM The performance quickly degrades the hotter you get, but it's possible. 13-Aug-19 11:09 AM And I'm going to be using off-the-shelf stacked peltiers with a very high delta, over 100K 13-Aug-19 11:09 AM The plan is to chill the hot side of the stack to around 0 and push the entire delta over into the negative range. At that point it won't be very efficient, but then again, a SiLi detector produces almost no heat. 13-Aug-19 11:09 AM And the modern Amptek ones don't use PIN diodes 13-Aug-19 11:09 AM They use SDDs - silicon drift detectors 13-Aug-19 11:09 AM But SDDs are so expensive that you'll want to sell your kidney just to look at the price 13-Aug-19 11:14 AM The 100K spec will be with the hot side at 300K or above. Peltiers work well with the hot side hot and things work much less well when they aren't. 13-Aug-19 11:14 AM The peltier efficiency drops to around 0 at around -100 to -120C 13-Aug-19 11:14 AM But at 0 on the hot side, the delta is just about enough to reach -70ish to -90ish with enough insulation 13-Aug-19 11:15 AM In vacuum? 13-Aug-19 11:15 AM Not sure if I'll be vacuum sealing it or just doing extreme insulation 13-Aug-19 11:43 AM Real quick the big problem with chilled non vacuum detectors is ice build up on the detector. 13-Aug-19 11:48 AM yeah, the condensation is probably the worst issue 13-Aug-19 01:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190813_225931-2F3C9.jpg 13-Aug-19 01:00 PM The vacuum adventure continues 13-Aug-19 01:00 PM Two BNIB(one NOS, one seems to be from 2013) valves, a tee for forevacuum bypass as per recommendation, a bunch of clamps 13-Aug-19 01:00 PM This is from @akkmsu, so if you want to buy something from him, I can vouch for it. Vacuum stuff is not cheap, but at least he beats eBay prices :P 13-Aug-19 06:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2424-CCB9B.JPG 13-Aug-19 06:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2425-8BA0B.JPG 13-Aug-19 06:38 PM that cold head is in more pieces than it's supposed to be 13-Aug-19 06:39 PM It was designed for a specific application... Im... Redesigning it ;) 13-Aug-19 06:39 PM rotary maintenance 14-Aug-19 02:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190814_094204-7036C.jpg 14-Aug-19 02:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190814_114248-DE759.jpg 14-Aug-19 12:21 PM Delicious doorknobs 14-Aug-19 12:25 PM Delicious doorknobs and lots of screws that are just a tad too long 14-Aug-19 12:25 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190814_212419-92432.jpg 14-Aug-19 12:32 PM Also are you sure about that 100g at 2.2W thing @GigaSquirrel and I assume thats perfect world math too? 14-Aug-19 12:33 PM yep 14-Aug-19 12:33 PM Because if thats correct perfect world my unit would be making 3.39 L per hour of LN2 14-Aug-19 12:33 PM like holy 14-Aug-19 12:33 PM if it has perfect isolation 14-Aug-19 12:33 PM Right, thats the big if part 14-Aug-19 12:33 PM but even then 14-Aug-19 12:33 PM if I have 2/3rds loss 14-Aug-19 12:33 PM we got those 100g/h from a 12 W coldhead 14-Aug-19 12:34 PM thought you said 2.2W? 14-Aug-19 12:34 PM Gigasquirrel: 100g of LN2 per hour is ~2.2W, assuming you use pure nitrogen at 300k 14-Aug-19 12:34 PM If its 12W... 14-Aug-19 12:35 PM you have to take 2.2w of heat out of the gas 14-Aug-19 12:35 PM the rest is lost to cooling down the dewar and whatnot 14-Aug-19 12:35 PM Ah... 14-Aug-19 12:35 PM well if that was for a 12W cold head then if I use that as a base to go off of I'd be getting 0.63 L per hour which seems more reasonable 14-Aug-19 12:36 PM yep 14-Aug-19 12:36 PM still not bad 14-Aug-19 12:36 PM I mean I got like 0.1~ Litres in an hour with almost no insulation lol 14-Aug-19 12:37 PM keep in mind that LN2 has a density of 0.8 14-Aug-19 12:37 PM of LOx anyway 14-Aug-19 12:37 PM I used a liquid nitrogen density conversion between Grams and L 14-Aug-19 12:37 PM ah, ok 14-Aug-19 12:38 PM Is this going to replace vacuum and sem stuff now 14-Aug-19 12:38 PM Everyone is hopping on the cryo train 14-Aug-19 12:38 PM I mean I have cryo heads I plan to use for vacuum stuff... 14-Aug-19 12:38 PM +1 14-Aug-19 12:38 PM This was just one that would be silly to use for vacuum stuff because its not designed for it 14-Aug-19 12:38 PM But yea I would be really happy if I could valve the helium lines... 14-Aug-19 12:38 PM so I could have like 2-3 different cold heads off one compressor and just decide which one I want to run 14-Aug-19 12:38 PM I don't think you can just leave them in line and just not power the head to not use it... I would think that would cause problems? 14-Aug-19 12:40 PM it doesn't take that long to change the lines... 14-Aug-19 12:40 PM Sure but I have old lines... 14-Aug-19 12:40 PM pretty sure not using it will not cause any troubles# 14-Aug-19 12:40 PM maybe some He leakage, but that'S it 14-Aug-19 12:40 PM I am concerned one time if I remove it I may lose all my helium 14-Aug-19 12:40 PM You can keep the head and compressor assembled with the lines 14-Aug-19 12:40 PM Right on NEW seals 14-Aug-19 12:40 PM but these are old lines... they were quite eh... 14-Aug-19 12:41 PM no I meant just leaving the coldhead on 14-Aug-19 12:41 PM like two in parallel but one not moving 14-Aug-19 12:41 PM Oh ok! 14-Aug-19 12:41 PM Cool if thats the case then I'll totally grab a set of Ts and setup two cold heads off my single phase compressor 14-Aug-19 12:41 PM then I can either do vacuum work or gen LN2 14-Aug-19 12:41 PM Without having to crack the system every time I want to switch between them 14-Aug-19 12:41 PM I wish I could run my 3 phase units... 14-Aug-19 12:41 PM then I could probably just run all 3 heads I have off one unit lol 14-Aug-19 12:43 PM I wonder if you can run both at 25-30 Hz for half power 14-Aug-19 12:43 PM hrm 14-Aug-19 12:43 PM because even 30 watts is plenty 14-Aug-19 12:43 PM Don't you have a huge power feed from that mainframe project? 14-Aug-19 12:43 PM and it should be linear with frequency 14-Aug-19 12:43 PM I mean the compressor may be-able to handle the load of both probably even... but I'd have to check specs 14-Aug-19 12:43 PM the cryo heads for vacuum I have are small... 14-Aug-19 12:43 PM ISO 100 and CF 6 14-Aug-19 12:44 PM Small is still relative 14-Aug-19 12:44 PM and they are old 14-Aug-19 12:44 PM Cryo heads have huge pumping speeds 14-Aug-19 12:44 PM Hundreds to thousands of l/s 14-Aug-19 12:44 PM But also @Deleted User that was setup at my parents house and it was just run on 240V 30A same as this single phase cryo compressor 14-Aug-19 12:45 PM I wonder if you can just stick a VFD in there 14-Aug-19 12:45 PM what? I don't think they are that crazy... unless you get the ones big enough for someone to climb in through the hole they attach to 14-Aug-19 12:45 PM You can if its powerful enough 14-Aug-19 12:45 PM most are only enough for a few HP 14-Aug-19 12:45 PM which is just going to blow up 14-Aug-19 12:45 PM The ones you can climb through have speeds in the tens of thousands of liters per second 14-Aug-19 12:45 PM Cryopumps are fast 14-Aug-19 12:45 PM oh you said hundreds to thousands 14-Aug-19 12:45 PM Yeah, not hundreds of 14-Aug-19 12:45 PM I thought you said HUNDREDS OF THOUSANDS 14-Aug-19 12:45 PM That'd be scary 14-Aug-19 12:45 PM XD 14-Aug-19 12:45 PM I already have the most empty void in my skull half the time, don't need to create a second one 14-Aug-19 12:46 PM A 100kl/s pump would probably pump a SEM down to -9 in a few seconds lol 14-Aug-19 12:47 PM probably faster than that lol 14-Aug-19 12:47 PM ...with the door open 14-Aug-19 12:47 PM my friend says on the evap sputter lines at work that are big enough to put scafolding in when the clean it... 14-Aug-19 12:47 PM and they use those big units that are probably 10s of thousands of L/s and they pump those down in seconds... 14-Aug-19 12:48 PM If I ever get a 5-axis mill I want to try making a turbomolecular pump that exhausts directly to atmosphere 14-Aug-19 12:49 PM I uh 14-Aug-19 12:49 PM I get that there's not a huge market for that, but why does it seem like no one has done that 14-Aug-19 12:49 PM that would have to be like a bajjilion stages 14-Aug-19 12:49 PM because it's a really dumb idea 14-Aug-19 12:49 PM only 3 14-Aug-19 12:49 PM and a TON of bearings 14-Aug-19 12:49 PM turbo -> howleck(drag) -> that vane edge thingy 14-Aug-19 12:49 PM I forgot the name 14-Aug-19 12:50 PM being a dumb idea has never stopped anyone 14-Aug-19 12:50 PM except me because I have no money and plenty of dumb ideas 14-Aug-19 12:50 PM Yea its like the company that makes the cryo head I have has a two stager... that gets down to 4K and is like 2W 14-Aug-19 12:50 PM which is nuts 14-Aug-19 12:51 PM you can build a joule-thompson cooler that will get down to <20K 14-Aug-19 12:51 PM If I had one of those I would have to start experimenting with making a home made quantum computer lol 14-Aug-19 12:51 PM it'll consume about a nitrogen tank per minute and scream louder than a jet engine taking off 14-Aug-19 12:51 PM while being the size of a finger 14-Aug-19 12:51 PM quantum doesn't work at 4K 14-Aug-19 12:51 PM 4K is the outer cooling system on most 14-Aug-19 12:51 PM they use dilution cooling to get to the qubits to mK levels 14-Aug-19 12:52 PM Ah didn't realize it got down that far, haven't looked into it in awhile 14-Aug-19 12:52 PM I mean if I wanted to work on quantum I really should just go to my boss and tell him thats where I want to go then work on one of the two IBM Q machines here in Poughkeepsie. 14-Aug-19 12:52 PM I wonder what you can do with normal cold heads though experimental wise, I guess play around with some super-conductors? 14-Aug-19 12:54 PM Definitely superconductor stuff 14-Aug-19 12:54 PM Material science 14-Aug-19 12:54 PM One interesting project is drifting your own SiLi detector 14-Aug-19 12:56 PM maybe some optics stuff? I've seen coldheads advertised as only some few nm vibration 14-Aug-19 12:56 PM I need to go to Lowes and get the equipment to tap into my water chilling line so I can stop chilling the cryo compressor with the garden hose lol 14-Aug-19 12:56 PM ehhh this one probably aren't those 14-Aug-19 12:56 PM I know they go to three phase heads for low vibration 14-Aug-19 12:56 PM Those 3 phase compressors I have output 3 phase for low vibration heads 14-Aug-19 12:56 PM not that you need to use them, they are just power outputs basically 14-Aug-19 12:57 PM Chilling optics is interesting for interferometry 14-Aug-19 12:57 PM Oh! Laser tuning! 14-Aug-19 12:58 PM ohh nice 14-Aug-19 12:58 PM You can shove the emission wavelengths and modes around really hard with cryogenic temperatures. 14-Aug-19 01:09 PM just a few steps later and some hobbyist has built an AVLIS 14-Aug-19 01:44 PM If I had a helium cryo I'd be looking at superconductors and possibly those really high frequency microbolometer things. 14-Aug-19 01:44 PM (Or I'd just bother friends who work with those to give me some old scrap 400GHz or 600GHz units :DDDDD) 14-Aug-19 01:47 PM wait 400 GHz microbolometers?! 14-Aug-19 01:47 PM are you talking about scanning rate or frequency they're sensitive to 14-Aug-19 01:48 PM The trick to sensing GHz-THz with microblometers is extremely dumb: Glue tuned shorted antennas to each bolometer. 14-Aug-19 01:48 PM That's how THz sensors work - they're just thermal cameras with a dummy load antenna array glued onto the sensor and plastic lenses. 14-Aug-19 01:48 PM But it's not possible to DIY, this happens at the MEMS stage 14-Aug-19 01:50 PM looks around in the hobby community I don't think that mems stuff is impossible to DIY... 14-Aug-19 01:52 PM maybe super basic MEMS 14-Aug-19 01:52 PM but not microbolometer MEMS 14-Aug-19 01:54 PM I have no idea about microelectronics, it's just a guess 14-Aug-19 01:55 PM it's DIY silicon fab, but harder 14-Aug-19 02:25 PM I'm going for mems type stuff at home 14-Aug-19 02:25 PM Possibly nothing moving though, aside from liquids and dissolved/suspended molecules 14-Aug-19 02:28 PM @GigaSquirrel Reception frequency, not scanning/bandwidth 14-Aug-19 02:28 PM naw 14-Aug-19 02:29 PM Yeah you ain't diying those anytime soon 14-Aug-19 02:29 PM Needs funky niobium doping and other stuff 14-Aug-19 02:29 PM Former employer had superconducting microbolometer arrays. Fun stuff. 14-Aug-19 04:06 PM Microbolometers are so cool. Just the ultimate in X-ray energy dispirsive resolution. 14-Aug-19 04:06 PM Single digit ev in some cases. 14-Aug-19 04:06 PM LHe and a rig capable of generating a 2T field will get you the conditions for a microbolometer with adiabatic demagnitisation. 14-Aug-19 04:06 PM And a very very good dewar. 14-Aug-19 04:06 PM I've not heard about high frequency microbolometers. 14-Aug-19 04:19 PM Microbolometers have nothing to do with x-rays 14-Aug-19 04:19 PM They're used for thermal imaging 14-Aug-19 04:19 PM The only reference I can find that links microbolometers with x-rays is this: https://www.sciencedirect.com/science/article/pii/S0924424797015124 14-Aug-19 04:19 PM hot electron bolometers are used for THz imaging 14-Aug-19 04:19 PM /detection 14-Aug-19 04:22 PM The term normally used in connection with X-rays is microcalorimeter, but I think they are basically the same thing. 14-Aug-19 04:23 PM microbolometers are pixel-sized 14-Aug-19 04:23 PM Isolated mass, cooled to millikelvin levels. Mercury telluride I think is one material. The X-ray raises the temperature of the pixel to a level that destroys the superconductivity of the sensor junction. 14-Aug-19 04:25 PM Definitely not what people associate with microbolometers 14-Aug-19 04:25 PM But yeah the actual device is used in particle physics 14-Aug-19 04:28 PM @rfs mentioned superconducting microbolometer arrays, doesn't seem very far from microcalorimeters. I'm not talking about the guts in a standard silicon thermal camera. 14-Aug-19 04:28 PM But yes, my wires are a bit crossed 14-Aug-19 04:39 PM Ours ware run as almost fully superconducting to get maximum sensitivity to RF 14-Aug-19 04:41 PM Awesome. Things get more sensitive the lower the temperature because specific heat capacity drops so much. 14-Aug-19 04:43 PM Oh man... 14-Aug-19 04:43 PM Did somebody say SURFACE AREA? 14-Aug-19 04:43 PM https://media.discordapp.net/attachments/529468991652233216/611343072206520330/DSC_2448.JPG 14-Aug-19 04:44 PM That your cold head? 14-Aug-19 04:44 PM yea... 14-Aug-19 04:44 PM That the displacer/regenerator? 14-Aug-19 04:44 PM so no... 14-Aug-19 04:44 PM https://www.cryomech.com/wp-content/uploads/2018/11/PT60.jpg 14-Aug-19 04:44 PM This is what they look like stock 14-Aug-19 04:44 PM this is custom ordered for Rigaku... 14-Aug-19 04:44 PM So you see that SS tube that comes down into the side of the copper? 14-Aug-19 04:45 PM Hehehe, it feeds that mesh? 14-Aug-19 04:45 PM that pushes gas through all that scintillated copper 14-Aug-19 04:45 PM Yea, its meant to make cold N2 for flowing over stuff 14-Aug-19 04:45 PM but I want to make LN2 more fun :) 14-Aug-19 04:46 PM Nice 14-Aug-19 04:46 PM I just need to figure out now if I want to keep that scintillation to make LN2 or if its better to remove some of it? 14-Aug-19 04:47 PM I feel like you're going to make ln2 in the inside and it'll get stuck and act like ice buildup 14-Aug-19 04:47 PM It's meant for gas flow not liquid 14-Aug-19 04:50 PM But shouldn't liquid just wick out? 14-Aug-19 04:51 PM Maybe? 14-Aug-19 04:51 PM Moisture and maybe co2 would freeze, but the N2 should be dry when going in to that? 14-Aug-19 04:51 PM It comes down to the pore size 14-Aug-19 04:51 PM Surface tension and restriction to flow and whatnot 14-Aug-19 04:51 PM Yep 14-Aug-19 04:51 PM Doesn't LN2 have lower surface tension tha water? 14-Aug-19 04:52 PM Even as thin as ln2 is, it's notably thicker than n2 17-Aug-19 11:35 AM Got all this stuff for $55 17-Aug-19 11:35 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20190817_113354-15616.jpg 17-Aug-19 11:35 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20190817_113405-C726D.jpg 17-Aug-19 11:50 AM Where are you buying all this? 17-Aug-19 12:29 PM This was a local pickup from eBay 17-Aug-19 12:29 PM But living in the SF Bay Area helps 19-Aug-19 07:18 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-68B56.png 19-Aug-19 07:18 AM actually something in a useful size for once 19-Aug-19 07:18 AM hey I know that mug! 19-Aug-19 07:21 AM how could that possibly be? 19-Aug-19 07:23 AM telepathy 19-Aug-19 05:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190819_161447-3AEF0.jpg 19-Aug-19 05:49 PM I got some scopes 19-Aug-19 05:49 PM Specifically 30 of them 19-Aug-19 05:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190819_161454-C501C.jpg 19-Aug-19 05:50 PM what do you need so many for? 19-Aug-19 05:50 PM also, what are these even 19-Aug-19 05:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190819_161508-CDADE.jpg 19-Aug-19 05:50 PM photons!? 19-Aug-19 05:50 PM Yeah... 19-Aug-19 05:50 PM I know difraction limit sucks and stuff 19-Aug-19 05:50 PM But holy hell 30 19-Aug-19 05:50 PM And they are really nice ones 19-Aug-19 05:51 PM Thinking about selling some? 19-Aug-19 05:51 PM Maybe 19-Aug-19 05:51 PM or you can hang them on the wall 19-Aug-19 05:51 PM They are really hard to ship because of the stands 19-Aug-19 05:52 PM the stands aren't worth much 19-Aug-19 05:52 PM This is 1350 lbs of microscope 19-Aug-19 05:52 PM maybe 300 of that is actual microscope 19-Aug-19 05:52 PM You can ask @Conmega about what shipping them is like 19-Aug-19 05:52 PM a friend of mine bought an olympus scope for tinkering recently 19-Aug-19 05:52 PM I have an old soviet machine scope with a huge magnification and an uncomfortably large working distance 19-Aug-19 05:52 PM around 280mm 19-Aug-19 05:53 PM Yeah but you are going to want the stands 19-Aug-19 05:53 PM I built a stand myself 19-Aug-19 05:53 PM Anyways I'm going to start driving home now 19-Aug-19 05:54 PM good luck driving them home lol 19-Aug-19 05:54 PM poor alignment 19-Aug-19 05:54 PM Yeah 19-Aug-19 05:54 PM You saw 19-Aug-19 05:54 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190819_153719-841DE.jpg 19-Aug-19 05:54 PM This is what it was like when I bid on it 19-Aug-19 05:55 PM how much did you pay for the lot? 19-Aug-19 05:57 PM whoa 19-Aug-19 06:02 PM Jeez, yea you know how much those stands weigh now @AdamMcCombs and you know WHY I didn't want to even try to ship that dang thing. 19-Aug-19 06:02 PM I'm amazed there aren't some flattened scopes down in the bottom from the weight of the stands and tubes. 19-Aug-19 06:02 PM For some reason microscope stands automatically get -20% rigidity 19-Aug-19 06:02 PM You have to build them much tougher than any other mechanical holdy bit 19-Aug-19 06:03 PM because your magnifying the surface you look at so a mm movement all of a sudden looks massive? 19-Aug-19 06:03 PM especially out on like a 3 ft arm 19-Aug-19 06:03 PM can't be that :P 19-Aug-19 06:03 PM 1mm of movement at the base becomes like a mile under the scope lol 19-Aug-19 06:03 PM yeah 19-Aug-19 06:03 PM and the huge mass hanging off a cantilever is a bad idea 19-Aug-19 06:04 PM but yea these stands are made out of like a 1" thick steel plate base and like 1.5" steel ROD 19-Aug-19 06:04 PM Those things are just jesus heavy 19-Aug-19 06:04 PM the one I built is very wobbly, but my trick for avoiding vibration is to put black residue rings around my eyes and hold the microscope with my eyelids while I'm working 19-Aug-19 06:04 PM enough for me to solder tiny stuff(0402, 0201, etc) under 19-Aug-19 08:31 PM Adam.. you know you want to give/sell me one of those, yeah? 19-Aug-19 08:46 PM I think everyone wants one 19-Aug-19 08:46 PM I think I want one, but not sure if I really do 19-Aug-19 08:46 PM I want something closer to a bio microscope, for experimenting with DIY wire bonding 19-Aug-19 10:43 PM no shipping for me 19-Aug-19 10:43 PM lucky you 19-Aug-19 10:43 PM I need to save up enough money to move to the US 19-Aug-19 10:43 PM trade places with someone that's emigrating because of politics 19-Aug-19 11:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190819_230129-8D70E.jpg 19-Aug-19 11:04 PM So this brings my total number of microscopes up to 37 19-Aug-19 11:04 PM So several you could say 19-Aug-19 11:04 PM The led light sources on these are flicker free as well 19-Aug-19 11:04 PM I'm kinda disappointed that they stick down quite a bit though. Cuts like an inch and a half off working distance 19-Aug-19 11:09 PM And not a single trinocular 19-Aug-19 11:09 PM Some really nice scopes though, and half of them look not yellow 19-Aug-19 11:09 PM What's the top knob on the more vintage ones for? Zoom? Backlight? 19-Aug-19 11:17 PM @AdamMcCombs set one aside that would be decent as a toolmaker's microscope or just examination of watch-gear stuffs 19-Aug-19 11:32 PM @Deleted User the knob is zoom. The yellow ones are all Olympus sz4045's, and the not yellow ones are Olympus SZ61's. The vintage ones are all old baush and Lomb scopes 19-Aug-19 11:32 PM I'll see what I can do about getting some scopes to people here 19-Aug-19 11:32 PM I definitely paid for these scopes so I can't just give them away though... 19-Aug-19 11:34 PM In the meantime I'm going to the flea market with a scintillator in my pocket 19-Aug-19 11:34 PM Muon showers keep setting it off randomly 19-Aug-19 11:35 PM I've got a Nikon SMZ 1000 stereomicroscope with a Plan Apo objective. I use it every day. Worth the money! 19-Aug-19 11:35 PM Yeah that's a nice scope 19-Aug-19 11:35 PM And of course we get that it wouldn't be free 19-Aug-19 11:36 PM Hi guys. Can’t sleep. 19-Aug-19 11:36 PM But not ripoff prices, like some on eBay 19-Aug-19 11:37 PM I'm planning on keeping quiet a few of them but we will see 19-Aug-19 11:37 PM How much was the lot? 19-Aug-19 11:37 PM A lot 19-Aug-19 11:37 PM Why would you need more than like 2? 19-Aug-19 11:37 PM Oh wow. What kind of magnification ranges on those? 19-Aug-19 11:37 PM A lot is not good 19-Aug-19 11:38 PM Reasons 19-Aug-19 11:38 PM Also what kind of focal range? 19-Aug-19 11:38 PM Mag with 10x eye peice is 6 to 45 19-Aug-19 11:38 PM For the SZ61's 19-Aug-19 11:38 PM The 4045 is 6 to 40 19-Aug-19 11:38 PM The B&L ones varry 19-Aug-19 11:39 PM Good for TQFP inspection 19-Aug-19 11:39 PM The SZ61 and SZ4045 is almost identical 19-Aug-19 11:39 PM Internally that is 19-Aug-19 11:39 PM Yeah good range for electronics work 19-Aug-19 11:40 PM Where are you in the world? I might be interested in lightening your load by one piece. 19-Aug-19 11:41 PM Seattle area 19-Aug-19 11:41 PM Oh good. Not to far so shipping would not be too bad. I’m in Fresno 19-Aug-19 11:41 PM These are from Boeing Kent I believe 19-Aug-19 11:42 PM Mine has a mag range of 8 to 80X. I find that it's a bit too much magnification for electronics work. 19-Aug-19 11:42 PM 6X probably better 19-Aug-19 11:42 PM Fair warning charrels the stands are very, very ridgid and heavy 19-Aug-19 11:43 PM Hahahaha. Kent. Just the name@of that place makes me laugh. Many Almost Live jokes made about it. I went there once and found it to be utterly normal. 19-Aug-19 11:43 PM Oh. Ok. Like 20 pounds or more? 19-Aug-19 11:43 PM Well if you want to swap one out piguy... 19-Aug-19 11:43 PM Uh 19-Aug-19 11:43 PM Way more 19-Aug-19 11:43 PM Like 40-50 19-Aug-19 11:44 PM Oh. Yeah I might be out then. 19-Aug-19 11:44 PM As I said ridgid 19-Aug-19 11:44 PM You can get light weight stands on eBay fairly cheap 19-Aug-19 11:44 PM It was a nice thought while it lasted. 19-Aug-19 11:44 PM That’s true 19-Aug-19 11:45 PM The sz stands are like 60-70 19-Aug-19 11:45 PM I could probably ship the stand for that price though 19-Aug-19 11:45 PM Wow. When you want a true gravitationally even bed. Hahahaha 19-Aug-19 11:46 PM They are boom stands 19-Aug-19 11:46 PM So you can swing over a wide area 19-Aug-19 11:47 PM Do they also telescope or extend or only swing? 19-Aug-19 11:47 PM I think working distance is 110mm if memory serves 19-Aug-19 11:47 PM Swing and extend 19-Aug-19 11:47 PM @AdamMcCombs , what auction was this? I struggle to find good local auctions for equipment.... 19-Aug-19 11:47 PM Ebay 19-Aug-19 11:48 PM oh 19-Aug-19 11:48 PM That would sure be handy for rework inspection. How much would you want for one? 19-Aug-19 11:48 PM Got really lucky 19-Aug-19 11:48 PM Don't know yet 19-Aug-19 11:48 PM Ok. 19-Aug-19 11:49 PM The problem with them right now is the led light's they have right now mount beneath the scope 19-Aug-19 11:49 PM So they eat up WD 19-Aug-19 11:51 PM WD? As in lubricant? 19-Aug-19 11:51 PM Working distance 19-Aug-19 11:51 PM Oh. Working distance 19-Aug-19 11:52 PM If you're interested in selling just LED light, let me know. I"m currently using a bicycle headlight in a 3D printed mount for my scope... 19-Aug-19 11:52 PM Sorry. Lack of sleep and I still can’t seem to get rest. Too many things on my mind 19-Aug-19 11:52 PM Lol I think I have a spare light 19-Aug-19 11:52 PM Will have to dig and check though 19-Aug-19 11:54 PM I am totally scatter brained these days. 22-Aug-19 05:59 PM cleaning a dirty aperture... 22-Aug-19 05:59 PM ...resulted in dramatic improvements in image sharpness! 22-Aug-19 05:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190822.000025-1A26C.jpg 22-Aug-19 06:04 PM Quite a scary process 22-Aug-19 06:04 PM Also, this is the most adorable power supply 22-Aug-19 06:04 PM https://i.spirit.re/qTbBd.png 22-Aug-19 06:07 PM Nice! Glad to see "work" getting done 22-Aug-19 06:10 PM I was under the impression that these tiny SEMs are still very expensive 22-Aug-19 06:10 PM Occasionally good deals are to be had on the secondary market 22-Aug-19 06:11 PM I guess I should be on the lookout for a SEM that won't require an international bank bailout to ship 22-Aug-19 06:12 PM Took me ~3 years to find a good deal 22-Aug-19 06:12 PM If is't not a secret, how much did you pay for it? 22-Aug-19 06:49 PM Nice! I need to do that with mine probably lol 22-Aug-19 06:49 PM Or I just need to ship Adam back over here and make him sit at both scopes for a few days, give him a few pounds of candy from the candy store in the Mall and leave him work. 22-Aug-19 06:49 PM :P 23-Aug-19 12:50 AM how you clean em? 23-Aug-19 12:50 AM i simply hold them in a bunsen 23-Aug-19 12:50 AM after splashing with ipa and stuff 23-Aug-19 01:05 AM right? 23-Aug-19 01:05 AM like in the video 23-Aug-19 01:05 AM burrrn 23-Aug-19 01:05 AM pffffffff 23-Aug-19 01:05 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/clean02_s-A8B90.jpg 23-Aug-19 01:05 AM like the crafsman would do it, right? 23-Aug-19 01:05 AM it's quite an important thin' to keep your apertures clean 23-Aug-19 01:05 AM or somethin' like that 23-Aug-19 02:03 AM those ceramic tweezers? 23-Aug-19 02:21 AM no, PE 23-Aug-19 02:21 AM just kidding 23-Aug-19 02:21 AM of course ceramics 23-Aug-19 02:21 AM that's an "expensive" one from switzerland 23-Aug-19 02:21 AM but nowadays - since vaping is a thing - you can buy ceramic tweezers for 1 euro something on aliexpress et al 23-Aug-19 03:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Motorgehause-29517.jpg 23-Aug-19 03:55 AM dammn im glad i decided to go for many small bolts 23-Aug-19 03:55 AM looks sooo much more sexy 23-Aug-19 03:57 AM ohh yes 23-Aug-19 03:57 AM (you wanted to post a cross section of your CAD) 23-Aug-19 04:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-AB946.png 23-Aug-19 04:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-88148.png 23-Aug-19 04:07 AM here is the sucky one 23-Aug-19 04:07 AM not up to date, buggy and you cant see everything 23-Aug-19 04:22 AM but now i've seen the actual parts, i can deduct from the cad drawing what is what and how it works 23-Aug-19 09:45 AM @george what connector is that? looks like the same one as on my cryocooler 23-Aug-19 09:45 AM Aeroquip 23-Aug-19 09:46 AM they are on all cryocoolers 23-Aug-19 09:46 AM series 5400, 1/2" iirc 23-Aug-19 09:46 AM cool, didn't realize it was a standard 23-Aug-19 09:46 AM you can get them from your local refrigerant magician 23-Aug-19 09:46 AM oh, did you find one? 23-Aug-19 09:47 AM its just really difficult to source them for some reason if you dont want to spend insane ammounts of money 23-Aug-19 09:47 AM well the female isn't so expensive https://hosewarehouse.com/products/5400-s5-4-eaton-5400-series-low-air-inclusion-refrigerant-female-no-adapter-quick-disconnect-neoprene-seal-with-guardian-seal-plating 23-Aug-19 09:48 AM *in the US 23-Aug-19 09:48 AM for some reason all this refigerant stuff is really obscure here in europe 23-Aug-19 09:48 AM you can barely find resources and even less suppliers and even more less suppliers willing to sell to individuals 23-Aug-19 09:48 AM its easier to buy chemicals here then this stuff 23-Aug-19 09:51 AM sounds like a business opportunity 23-Aug-19 09:51 AM (for an american, I mean) 23-Aug-19 09:51 AM if you are willing to sell for affordable shipping cost hell yeah 23-Aug-19 09:51 AM ill be ur first customer of 4 of those fittings 23-Aug-19 01:05 PM Low vac low mag image of a circuitboard. Just laid it in the sample chamber with no prep work.... 23-Aug-19 01:05 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190823.000026-6B537.jpg 23-Aug-19 01:07 PM Damnit stop tempting me 23-Aug-19 01:07 PM I'm going to build my own! 23-Aug-19 01:07 PM And it'll probably make that kind of image at best, after months of twiddling 23-Aug-19 01:08 PM I think vibrations were causing it to slowly drift around. I was zooming in on it and started noticing debris was either accumulating on the surface or bouncing around. Decided to abort! 23-Aug-19 01:08 PM It's interesting how the grooves accumulate more electrons 23-Aug-19 01:08 PM And are shinier 23-Aug-19 01:08 PM But the deep valleys(under the solder mask) eat all of them like a pump 23-Aug-19 01:10 PM Adam set the background on my SEM software to a Japanese flower motif... 23-Aug-19 01:13 PM It's a Japanese scope and I thought it was really funny you could actually set the background to that, and that it included that as a stock background 23-Aug-19 01:13 PM - And other phrases in this book of highly unlikely quotes 23-Aug-19 01:14 PM I would get a cool image with the scope then set the background to that 23-Aug-19 01:14 PM What does Vac-Low mean? 23-Aug-19 01:14 PM Is it an ESEM? 23-Aug-19 01:14 PM Not technically a esem but yes 23-Aug-19 01:14 PM It's just air instead of water vapor 23-Aug-19 01:15 PM How high does it run? 23-Aug-19 01:15 PM Or... low... 23-Aug-19 01:15 PM Good question 23-Aug-19 01:15 PM No data? 23-Aug-19 01:15 PM No I just don't know 23-Aug-19 01:15 PM For that scope 23-Aug-19 01:16 PM Manual says 10 to 30 Pa 23-Aug-19 01:16 PM That is foreline pressure 23-Aug-19 01:16 PM huh 23-Aug-19 01:16 PM Yup 23-Aug-19 01:16 PM That's what it does 23-Aug-19 01:16 PM ... can I make a SEM that runs off a backing pump? 23-Aug-19 01:16 PM Well 23-Aug-19 01:16 PM The column doesn't run at that pressure 23-Aug-19 01:16 PM It's deferentially pumped 23-Aug-19 01:16 PM Ah, just separate pressures 23-Aug-19 01:16 PM With the tentothenegatives there's "no" air to deal with 23-Aug-19 01:17 PM Yeah pretty much 23-Aug-19 01:18 PM A friend of mine bought that cheap multistage turbo, I made a deal with him that if it's too expensive to ship he keeps it 23-Aug-19 01:18 PM But if it's cheap enough, I'll get it off him 23-Aug-19 01:18 PM Could be nice for a differentially pumped SEM 23-Aug-19 01:18 PM Given the three stages 23-Aug-19 01:18 PM Yeah but a bit excessive 23-Aug-19 01:18 PM it was 70 bux including shipping 23-Aug-19 01:19 PM And in reality optimal config is 2 roughing pumps 23-Aug-19 01:19 PM 2 roughing pumps? 23-Aug-19 01:19 PM does the column not require a turbo? 23-Aug-19 01:19 PM No it does 23-Aug-19 01:19 PM It's just not as flexible to back the column turbo with the chamber vacuum 23-Aug-19 01:20 PM ah, got it 23-Aug-19 01:20 PM It works ish and this scope does it because it's cheaper 23-Aug-19 01:20 PM Differentially pumped optics is a big can of worms as though 23-Aug-19 01:21 PM which means I'm not doing that 23-Aug-19 01:22 PM Yeah Bell jar sem isn't really complatble with esem 23-Aug-19 01:22 PM Mine is going to be more of a tube jar 23-Aug-19 01:22 PM Still 23-Aug-19 01:22 PM yeah, no differential pumping 23-Aug-19 01:23 PM Getting the diferntial apurture right is hard 23-Aug-19 01:23 PM I'm going to try making a SEM out of a regular CRT gun first 23-Aug-19 01:23 PM but that probably won't work 23-Aug-19 02:16 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Hauptblockschrauben-5787E.jpg 23-Aug-19 02:16 PM takin some shape 23-Aug-19 02:19 PM looking good 23-Aug-19 02:19 PM have you started working on the cold part yet? 23-Aug-19 02:19 PM apart from your failed soldering attempt 23-Aug-19 02:21 PM nop, still dont have the materials, hopefully ill laminate some carbon tube tomorrow for the regenerator shell 23-Aug-19 02:22 PM awesome 23-Aug-19 02:22 PM any decision on the regen material yet? 23-Aug-19 02:23 PM Pb for the beginning, just because i already have it 23-Aug-19 02:23 PM right 23-Aug-19 02:23 PM the regen shell will have threads for easy swap of media 23-Aug-19 02:23 PM copper might be better 23-Aug-19 02:23 PM according to tungsten wolfram alpha it is (data not available) j/kgk for copper vs (data not available) j/kgk for lead at 80 k 23-Aug-19 02:25 PM will get copper grnules and before that try to obtaiin some copper shot 23-Aug-19 02:26 PM my first stage is copper mesh out of all things 23-Aug-19 02:26 PM many many slices laid ontop of each other 23-Aug-19 02:28 PM i thought of that but im by faar to lazy... 23-Aug-19 02:28 PM what if you put copper mesh in a dull coffee grinder 23-Aug-19 02:28 PM might be doable with a hole punch 23-Aug-19 02:28 PM cutting 150 discs from mesh meeeeh 23-Aug-19 02:28 PM oh, i can buy coper granules on ebay 23-Aug-19 02:28 PM just i would like balls more 23-Aug-19 02:28 PM would surface area matter? 23-Aug-19 02:28 PM there is shot for enviromentally friendly shotgun hunting rounds 23-Aug-19 02:28 PM but i couldnt find a source without buying shotgun shells and taking them apart 23-Aug-19 02:28 PM surface area should be large but flow resistancealso matters 23-Aug-19 02:30 PM so something like the sintered brass bead rings used in cheap air filters wouldn't work? 23-Aug-19 02:31 PM it may but it would have to be quite large pore stuff 23-Aug-19 02:31 PM the gas will have to run through roughly 15cm of the stuff 23-Aug-19 02:31 PM in a few hundred milliseconds 23-Aug-19 02:31 PM the beads are roughly hundreds of microns in the filters I have 23-Aug-19 02:32 PM i know these filters in smaller sizes and i will keep it in mind 23-Aug-19 02:32 PM for now i will take lead shot since its the easiest for testing and will definetly work 23-Aug-19 02:32 PM one purpose of building this thing is to test stuff 23-Aug-19 02:32 PM so i will swap the material at some point and try other stuff 23-Aug-19 02:32 PM but first it will have to operate 23-Aug-19 03:11 PM would turning out of a big brick of that sintered bronze be a feasible option? 23-Aug-19 03:30 PM May be but the outside has to be sealed so a container is needed anyways 23-Aug-19 03:30 PM it woudl make mechaical construction easier though 23-Aug-19 04:04 PM then i'll see what i can get you 24-Aug-19 02:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Kolben_liner-50ABA.jpg 24-Aug-19 02:28 PM difficult to make out but now i have the drive pistons cylinder lined with stainless 24-Aug-19 02:28 PM reeeeally smooth on the inside 24-Aug-19 02:28 PM ans also 24-Aug-19 02:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/erster_druck-FCEC9.jpg 24-Aug-19 02:28 PM It seems it may even be more or less gas tight 24-Aug-19 02:34 PM that is some serious mechanical prototyping 24-Aug-19 03:01 PM Yea really! Great work, I apologize for any doubt earlier haha I just know its a trap for some people to get into a project too big but man much respect and great skills there! 24-Aug-19 07:44 PM Playing with my desktop SEM settings a bit more... Getting more detail, but vibrations from vacuum pump are causing problems at high magnification... 24-Aug-19 07:44 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20190824.000033-CF3B5.jpg 24-Aug-19 07:45 PM Oh yeah that's starting to look really good 24-Aug-19 07:45 PM Yeah you can really see the high frequency vibration 24-Aug-19 07:46 PM Sample height is ~38mm, maximum detail is supposedly obtained at ~48mm. Still some opportunities for improvement. 24-Aug-19 07:52 PM Is this the forepump, or the turbo? 24-Aug-19 07:52 PM Roughing pump. It was on the same table as the scope, moved it to the floor. I'm using stainless vacuum hose which Adam says is a no-no for vibrations. 24-Aug-19 07:53 PM it is a no-no, definitely 24-Aug-19 07:53 PM buy a solid brick, bolt it to the brick 24-Aug-19 07:53 PM I wonder if a thin silicone cable with a spring inside it would help 24-Aug-19 07:53 PM that should transmit the smallest possible amount of vibrations 24-Aug-19 07:54 PM Maybe I should switch back to the rubber hose it originally came with. 24-Aug-19 07:54 PM that's a good idea 24-Aug-19 08:14 PM No don't use that gum rubber 24-Aug-19 08:24 PM ow, gum rubber isn't good 24-Aug-19 08:35 PM What kind of tubing should I use? 24-Aug-19 08:35 PM reinforced(spring)silicone, PVC 24-Aug-19 08:35 PM anything that doesn't outgas at forevacuum pressures 24-Aug-19 08:35 PM or outgasses so little it never reaches the scope or turbo 24-Aug-19 08:39 PM Gum rubber is the best from a vibration standpoint 24-Aug-19 08:39 PM Tygon is better from a stability standpoint 24-Aug-19 08:39 PM It's also more expensive 24-Aug-19 08:40 PM I don't think a meter of foreline is going to empty anyone's bank account 25-Aug-19 12:09 AM @Conmega Well, it could have gone a different route, most of the time with me its a matter of motivation... Also this thing is a lot of machining work but not really a design challenge. 25-Aug-19 01:53 PM Aaaaand the daily update 25-Aug-19 01:53 PM https://youtu.be/M3AUjnQNSPY 25-Aug-19 01:53 PM im very very happy with the valve so faar, it seals absolutely perfectly ant at least at 7atm compresed air the stepper is plenty strong enoug even just using a run cpacitor 25-Aug-19 01:54 PM awesome! 25-Aug-19 02:04 PM Yeah very awesome. Nice seeing such an ambitious project progressing. 25-Aug-19 08:30 PM very nice! 25-Aug-19 08:54 PM That is a very cool project 26-Aug-19 12:24 AM thanks ^-^ 26-Aug-19 12:48 AM woah awesome 26-Aug-19 12:48 AM if it works i'll clone it 26-Aug-19 12:48 AM what's the hardest part? 26-Aug-19 12:48 AM i guess a good rotary valve and the displacer-piston/cylinder precision? 26-Aug-19 12:48 AM ok TIL discord parses regex substitutions? ^^ 26-Aug-19 01:37 AM oh, the piston bore is simple, i just took some stainless cylinder tubing and glued it into the aluminium valve block using loctite 26-Aug-19 01:37 AM no maching needed 26-Aug-19 01:37 AM the sealing surface has to be smooth obviously but that can e done quickly on a glass plate with sandpaper 26-Aug-19 01:37 AM i guess the most annoying/ difficult part is drilling angled holes though the valve body, you will need a mill for that and without a rotary table its going to be some work 26-Aug-19 01:37 AM also drilling a whole bunsh of flanges 26-Aug-19 02:01 AM ah ok 26-Aug-19 02:01 AM i mean the displacer-piston for the cooling itself 26-Aug-19 02:01 AM the thing oscillating back and forth in the cylinder 26-Aug-19 02:01 AM i've no clue how much precision is needed for that part 26-Aug-19 02:04 AM not that much 26-Aug-19 02:04 AM as the whole thing is going to shrink anyway 26-Aug-19 02:04 AM ok 26-Aug-19 02:05 AM the better the gaskets the better the efficiency 26-Aug-19 02:05 AM but I just used a loose PTFE ring that froze into position, and my second stage seems to work 26-Aug-19 02:05 AM not great, but it works 26-Aug-19 02:06 AM ok 26-Aug-19 02:06 AM that's promising then 26-Aug-19 02:06 AM do-able i mean 26-Aug-19 02:06 AM very much so 26-Aug-19 02:16 AM jup and i hope since i just want a single stage the seal will never freeze anyways 26-Aug-19 02:16 AM it sould be fine just using an o-ring or a piston seal 26-Aug-19 02:16 AM the displacer tube i made actually has .5mm play 26-Aug-19 02:16 AM since it has to seal just on one end to stop any bypass 26-Aug-19 02:16 AM those things are the main reason i decided to buildthis thing, it just seems so easy 26-Aug-19 02:16 AM no magic involved... 26-Aug-19 12:47 PM Aaand with a bit of luck im ready for the first actual heat movement tomorrow 26-Aug-19 12:47 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Regen_komplett-F0FDD.jpg 26-Aug-19 12:47 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Regen_kupferrohr-4B4A5.jpg 26-Aug-19 12:47 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Vorl_fertig-8CF34.jpg 26-Aug-19 02:54 PM looks industrial 26-Aug-19 02:54 PM >:) 26-Aug-19 09:02 PM Woot! 26-Aug-19 10:29 PM wows 26-Aug-19 10:29 PM run it! 27-Aug-19 12:13 AM aaaand i killed the drive motor 27-Aug-19 12:13 AM oof 27-Aug-19 12:14 AM running it from an autotransformer and a runcap was not a good idea 27-Aug-19 12:14 AM no torque and of cause at high pressure it stalled and i turned the voltage up 27-Aug-19 12:14 AM well, stepstick it is... 27-Aug-19 12:14 AM I was going to ask what killed it... 27-Aug-19 12:14 AM How hard is the swap going to be? 27-Aug-19 12:15 AM will be fixed soon, luckily i have plenty of those motors 27-Aug-19 12:15 AM swap will be easy as the nema motors can be disassembled easily, so ill just have to change the stator 27-Aug-19 12:15 AM Nice at least you are not waiting on parts 27-Aug-19 12:16 AM that would really upset me now 27-Aug-19 12:16 AM aaaaalso 27-Aug-19 12:16 AM Yeah waiting for stuff to ship sucks 27-Aug-19 12:16 AM running from 2 bars of air it actually started cooling 27-Aug-19 12:16 AM its also when overnight shipping is really tempting... 27-Aug-19 12:16 AM Who needs He when you have checks notes 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide... 27-Aug-19 12:17 AM Im sure the He is in there somewhere right? 27-Aug-19 12:17 AM Oh wait... 27-Aug-19 12:19 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/motor_kaputt-71EC8.jpg 27-Aug-19 12:19 AM actually doesnt even look toasty... 27-Aug-19 12:20 AM It tests short though? 27-Aug-19 12:20 AM yep 27-Aug-19 12:20 AM and the smelltest 27-Aug-19 12:20 AM Well you can make it look toasty... 27-Aug-19 12:21 AM i dont really want to 27-Aug-19 12:21 AM 27-Aug-19 12:21 AM You have the power 27-Aug-19 12:21 AM this one can easily be rewound in case i need one in the future 27-Aug-19 12:21 AM just plug it straight into the wall 27-Aug-19 12:21 AM oooh, i have some nice high current transformers for this purpose 27-Aug-19 12:22 AM You mean short finding devices? 27-Aug-19 06:13 AM https://youtu.be/T4Qq9rzidAw 27-Aug-19 06:18 AM awesome 27-Aug-19 10:23 AM Does it get cold? 27-Aug-19 11:17 AM jup 27-Aug-19 11:17 AM no cryo yet but it does move heat nicely 27-Aug-19 11:38 AM Awesome! 28-Aug-19 12:46 AM got a cold finger? 28-Aug-19 12:46 AM a c-movies cryo villain: cold finger 28-Aug-19 01:24 AM I like that idea 28-Aug-19 01:24 AM and instead of covering his victims in gold he just cools them down to 5 k 28-Aug-19 01:28 AM yep 28-Aug-19 01:28 AM as he says "to conservate them" 28-Aug-19 01:28 AM of course he needs a german accent 28-Aug-19 01:28 AM and sometimes he misspell "conservate" as "conversate" - what's kinda funny because he talks very much 28-Aug-19 01:28 AM "conversate them (to death)" 28-Aug-19 01:28 AM u know those villains ... talk and talk and talk - explaining the whole evil masterplan 28-Aug-19 01:37 AM xD 28-Aug-19 01:42 PM isn't that SubZero in Batman's universe? 28-Aug-19 01:42 PM ah christ 28-Aug-19 01:42 PM Mr Freeze 28-Aug-19 01:42 PM ICE to meet you! random schwarzenegger sounds 28-Aug-19 02:50 PM https://youtu.be/i5t-ooEOsKc 28-Aug-19 02:50 PM ITS ALIIIIVE 28-Aug-19 02:54 PM how cold? 28-Aug-19 02:55 PM idk, thermal imager bottoms out at -25 28-Aug-19 02:55 PM for today im to lazy to set up the fluke 28-Aug-19 02:55 PM boo, get a thermocouple in there! 28-Aug-19 02:55 PM thermocoples are the wrong way to measure this 28-Aug-19 02:55 PM today im happy it cools, there is still some stff to be done before going cryo 28-Aug-19 02:55 PM type T thermocouples are made exactly for this 28-Aug-19 02:56 PM pt100 is better ^^ 28-Aug-19 02:56 PM 4 wire on the fluke 28-Aug-19 02:57 PM Or those nice diodes that come with calibration charts? 28-Aug-19 02:57 PM mch more accurate resistive then tc 28-Aug-19 02:57 PM yes 28-Aug-19 02:57 PM i have one 28-Aug-19 02:57 PM sadly without the chart.... 28-Aug-19 02:57 PM :/ 28-Aug-19 02:57 PM and the spread is several orders of magnitude 28-Aug-19 02:57 PM also only below 30K iirc 28-Aug-19 03:18 PM Very nice work @george !!! 28-Aug-19 03:19 PM thanks! 28-Aug-19 03:24 PM Yeah I'm very impressed. 28-Aug-19 03:25 PM but keep back someexcitement for when i actually reach any signifficant temperature ^^ 28-Aug-19 03:25 PM there is still some things i know for certain that need fixing 28-Aug-19 05:10 PM checkout the #machining channel for more detailed procedure of making this extractor for grinder pulley 28-Aug-19 05:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0578-3FBF2.jpg 28-Aug-19 05:10 PM the steel I used is also hardenable, but not sure I will need to do that, this pulley came off real well 28-Aug-19 05:10 PM basically 35mm x 1.5mm thread on the outside, and M10 on the inside.. thread unit into pulley, and thread screw into unit, pops right off 28-Aug-19 05:10 PM this was my first odd-job thread, where I didnt have a die on hand for it (juast basic M3-M12, crummy quality stuffs) 28-Aug-19 05:10 PM also, for a while I coudlnt figure out why the lathe wasnt doing the right thread pitch.. apprently I had the power feed enagged, not the half nut ont he leadscrew, which are geared differently.. 29-Aug-19 12:53 AM @george what does GM in your video title mean? 29-Aug-19 01:36 AM nice 29-Aug-19 01:36 AM Gifford-McMahon 29-Aug-19 01:36 AM https://en.wikipedia.org/wiki/Cryocooler#GM-refrigerators 29-Aug-19 06:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/frost-DB7AA.jpg 29-Aug-19 06:47 AM and then at -40 for some reason the walve got stuck 29-Aug-19 06:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/regenerator_verliert_kupfer-32940.jpg 29-Aug-19 06:47 AM i hope the crap didnt pass into the gas lines 29-Aug-19 07:02 AM ow, wth is that? 29-Aug-19 07:26 AM probably broken 29-Aug-19 07:28 AM so those are just copper filings you used as regerator? 29-Aug-19 07:28 AM I thought you wanted to use lead at first? 29-Aug-19 07:37 AM didnt have enough leas, so i just stuffed it with copper shavings i had laying around 29-Aug-19 07:37 AM except for escaping they did their job 29-Aug-19 09:14 AM but for the first try 29-Aug-19 09:31 AM ill get it to work, as i told previously there is still some stuff to do, i didnt expect to go cryogenic yet 29-Aug-19 09:31 AM thre regenerator tube is undersized, the material is wrong, i dont have shock absorbers working at low temperature and there is plenty of dead volume to be filled 29-Aug-19 09:31 AM also i suspect i will have to cool the "hot end", as its dissapating the pumped heat 29-Aug-19 09:31 AM its getting pretty hot right next to the cold tip 29-Aug-19 09:31 AM i guess ill braze on a copper cooling jacket in this place that can be cooled using normal refrigerant, maybe it will even increase efficiency 29-Aug-19 09:34 AM -40 is still lower than a reasonable fridge can do 29-Aug-19 09:34 AM So it's an accomplishment :P 29-Aug-19 09:34 AM but not worth the effort i went through 29-Aug-19 09:34 AM Very few people can put "designed and built a cryocooler" on their CV though 29-Aug-19 09:34 AM the nice thing is, at -40 i plotted temperature over time and it was still linear 29-Aug-19 09:34 AM so i guess even using this setup and just waiting longer i would easily reach -100, maybe even all the way 29-Aug-19 09:34 AM hehe, yep, not many people have been stupid enough to sink so much time into soething you may just buy on ebay 29-Aug-19 09:34 AM but having done this i can play around and even do stuff like swap the cold end for a pulse tube and see wich works better 29-Aug-19 10:09 AM :)) 31-Aug-19 01:30 PM @george will you do a write-up on construction eventually, or a nice howto video? 31-Aug-19 03:02 PM as soon as i reach nitrogen temps and know nothing important is wrong 06-Sep-19 10:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190623_014634-C7AED.jpg 06-Sep-19 10:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190623_014631-0A512.jpg 06-Sep-19 10:33 AM Now gone but the largest (both in power, size and weight) power device I have so far owned. 06-Sep-19 10:34 AM What you them there need is a few soviet radar amplifier tubes 06-Sep-19 10:34 AM They're cheap 06-Sep-19 10:34 AM The new owner is now looking for a proper socket, after testing the heaters 06-Sep-19 10:34 AM The new owner also still owes me a beer. 06-Sep-19 10:34 AM I Have some GI-7b. GI-7bt (dem thicc tropics models) and GI-6b 06-Sep-19 10:34 AM Ofc those are only 200-350W per tube so rather low power. 06-Sep-19 10:34 AM but rated to 3000MHz or 1300MHz 06-Sep-19 10:34 AM And I mostly seem them used below 440MHz :DDD 06-Sep-19 10:36 AM You need some GMI series ones 06-Sep-19 10:36 AM Folks replace hard to find HF PA tubes with them 06-Sep-19 10:36 AM Nah, ain't got the PSU nor the vacuum variables (unless making some wild VUSHF PA) 06-Sep-19 10:36 AM GI-7bt will be fine with two MOT's 06-Sep-19 10:37 AM they're pulse tubes too 06-Sep-19 10:37 AM several megawatts short-term 06-Sep-19 10:37 AM the "I" in "GMI" means "impulse" 06-Sep-19 10:37 AM GI-7b(t) is pulse also, few kW pulse, 200-350W CW in hobby use. 06-Sep-19 10:37 AM Ah 06-Sep-19 10:37 AM G is "generator" 06-Sep-19 10:37 AM M is... "mhmhmhm", Idk 06-Sep-19 10:37 AM I'm rusty in my soviet power tube designations. 06-Sep-19 10:37 AM Wikipedia has a decent article on the designation IIRC. 06-Sep-19 10:37 AM Tbh I'm more interested in soviet/russian millimeter wave capable semiconductors than tubes these days 06-Sep-19 10:38 AM oh, M is for modulation 06-Sep-19 10:38 AM unless the tubes are klystrons for millimeter waves or single centimeter waves 06-Sep-19 10:39 AM there's tiny but ridiculously powerful soviet magnetrons 06-Sep-19 10:39 AM I think I have only seen huge soviet magnetrons live 06-Sep-19 10:39 AM a toy-looking handheld device that can output megawatt pulses 06-Sep-19 10:40 AM like tens of kilos weight 9GHz X-band radar stuff 06-Sep-19 10:40 AM @Deleted User Have you seen zilipopers youtube videos? 06-Sep-19 10:40 AM that's what I was about to direct you to 06-Sep-19 10:41 AM Dudes [copulating] mad. 06-Sep-19 10:41 AM cooking bacon on a 900kW magnetron is just funny 06-Sep-19 10:41 AM https://www.youtube.com/watch?v=fEy3W695LMg 06-Sep-19 10:41 AM Oh yes 06-Sep-19 10:41 AM Also seen this article https://en.wikipedia.org/wiki/Russian_tube_designations 06-Sep-19 10:41 AM I kainda sorta also want some russian hydrogen thyratrons for stuff 06-Sep-19 10:41 AM For example for fulfilling my teenage dream of building a 2.4GHz pulse radar from a microwave oven. 06-Sep-19 10:43 AM microwave ovens are really bad 06-Sep-19 10:43 AM Yeah noisy and wideband output 06-Sep-19 10:43 AM Still awesome that they can make a 600W CW output magnetron for under 20usd/pcs 06-Sep-19 10:43 AM likely nowdays close to 10usd 06-Sep-19 10:43 AM just mad. 06-Sep-19 10:43 AM But my interests lately have been more on the world above 10GHz 06-Sep-19 10:43 AM In terms of RF and RF devices. 06-Sep-19 10:43 AM And those cheap soviet Gunn-diodes are so tmepting 06-Sep-19 10:43 AM I have some ~40GHz units, but I need to cozy up some machine shop dudes to get mechanical parts made for them 06-Sep-19 10:43 AM And I'm gona first experiment on "just" 10GHz to learn more about it. 16-Sep-19 02:59 PM I've settled on the display I will be using for the low cost turbo drive/vacuum controller projects 16-Sep-19 02:59 PM https://i.spirit.re/0JWhM.mp4 16-Sep-19 02:59 PM Also decided that the ubiquitous STM32F103C8T6 micro will be good 16-Sep-19 02:59 PM In the form of a DIP-packaged black pill(like the blue pill, but actually properly made to spec) 16-Sep-19 02:59 PM It'll probably be running FreeRTOS 16-Sep-19 02:59 PM It's running a few concurrent test tasks in the clip 16-Sep-19 02:59 PM The display is $2.25, the black pill is $2.8ish. 16-Sep-19 02:59 PM I'll try squeezing it into the arduino IDE(stm32duino) with the USB DFU bootloader, to make it easier to understand and program for people less familiar with stm32 25-Sep-19 04:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190925_125103-2DFB6.jpg 25-Sep-19 04:25 AM I am finally getting my sh.. together! 25-Sep-19 04:25 AM quite literally when it comes to my workshop 25-Sep-19 04:25 AM Very nice 25-Sep-19 04:26 AM I haven't seen so much free floor space since months 25-Sep-19 04:26 AM I really want a a proper separate lab table from my computer table 25-Sep-19 04:26 AM Most of my gear is in storage or in some other not-in-use location. 25-Sep-19 04:27 AM it was the same here for the most time 25-Sep-19 11:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190925_180929-894A9.jpg 25-Sep-19 11:06 AM btw, I even got the table done! 25-Sep-19 11:06 AM just in time to take the leak tester apart 25-Sep-19 11:06 AM with someone 25-Sep-19 11:07 AM and while you wasted your time cleaning your workshop and tidying everything up, i did something more fun and 25-Sep-19 11:07 AM eehm 25-Sep-19 11:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_9160-02A86.JPG 25-Sep-19 11:08 AM I am amazed 25-Sep-19 11:08 AM wait, why is my work table suddenly useableclean, too? and some projects finished? and tools sorted? 25-Sep-19 11:09 AM mine's cleaner 25-Sep-19 11:10 AM mine will become cleaner when i get The Boxes (tm) tomorrow 25-Sep-19 11:12 AM if 25-Sep-19 11:25 AM Omg I can see some clear bench space. You trying to make me feel guilty and ashamed? Hahahaha 25-Sep-19 11:26 AM Yes! 25-Sep-19 11:30 AM definitely yes. Clean up, guys. it's worth it once in a while 25-Sep-19 11:30 AM (while: somewhere between 3 months and a few years) 25-Sep-19 12:02 PM @GigaSquirrel nice lab! 25-Sep-19 12:02 PM Thanks! 25-Sep-19 12:11 PM the other half isn't as pretty atm 25-Sep-19 12:11 PM lots of chips 25-Sep-19 12:11 PM and I mean 25-Sep-19 12:11 PM lots 25-Sep-19 12:35 PM Oh stop reminding me of how bad my shop is right now 25-Sep-19 12:35 PM we want pics! 25-Sep-19 12:35 PM everyone post their workshop! 25-Sep-19 12:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190918_034655-F65E4.jpg 25-Sep-19 12:36 PM This was about a week ago 25-Sep-19 12:36 PM Notice I'm blocked from the door 25-Sep-19 12:36 PM this is like my end goal 25-Sep-19 12:37 PM I had to move the scope to get out 25-Sep-19 12:37 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190916_233731-8C834.jpg 25-Sep-19 12:37 PM My shop was useable before I showed up with a box truck and doubled how much instrumentation and parts I have in there 25-Sep-19 12:38 PM if you want to get rid of some... 25-Sep-19 12:38 PM Nah 25-Sep-19 12:38 PM I have a time lapse of the move in 25-Sep-19 12:39 PM Respect for this scope 25-Sep-19 12:39 PM Yeah it's a beast 25-Sep-19 12:39 PM 1.4nm resolution 25-Sep-19 12:39 PM 2 something at 1kv 25-Sep-19 12:40 PM Amazing 25-Sep-19 12:40 PM How much one of these? 25-Sep-19 12:40 PM 10-11 vac in the gun 25-Sep-19 12:40 PM Cold field emmison... 25-Sep-19 12:40 PM Sexy 25-Sep-19 12:41 PM It varies 25-Sep-19 12:41 PM Most of my scopes are next to free 25-Sep-19 12:41 PM Oh cool 25-Sep-19 12:41 PM Donation? 25-Sep-19 12:41 PM Well this one wasn't... 25-Sep-19 12:42 PM Okay 25-Sep-19 12:42 PM It wasn't unreasonable at all though and I got a bunch of other stuff 25-Sep-19 12:42 PM Let's put it this way I've paid more to ship a scope than this costs 25-Sep-19 12:44 PM Hahaha 25-Sep-19 12:44 PM Are you in USA? 25-Sep-19 12:44 PM Yeah 25-Sep-19 12:44 PM Oh you have so much cheap cool stuff on eBay 25-Sep-19 12:44 PM I also regularly pay 4k to ship them 25-Sep-19 12:44 PM This was a off market deal... 25-Sep-19 12:45 PM Here in Europe just a few things and overpriced 25-Sep-19 12:45 PM Yeah it's kinda tough over there 25-Sep-19 12:45 PM The infinite industrial surplus here is great 25-Sep-19 12:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190911_175131-102DB.jpg 25-Sep-19 12:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190911_175354-D78E5.jpg 25-Sep-19 12:45 PM I got this rig free with the scope as well 25-Sep-19 12:47 PM oh wow, that's one hell of an oildiff 25-Sep-19 12:47 PM Omg I was thinking the same 25-Sep-19 12:48 PM Yeah right? 25-Sep-19 12:48 PM Way oversized for the chamber 25-Sep-19 12:48 PM Rotary pump leaked the whole way home 25-Sep-19 12:50 PM what... is it? sputter coater? 25-Sep-19 12:50 PM So that was cool 25-Sep-19 12:50 PM ouch 25-Sep-19 12:50 PM It's a something 25-Sep-19 12:50 PM self-lubricating for high performance transportation 25-Sep-19 12:50 PM it sure looks like a something 25-Sep-19 12:51 PM It's got a massive high current transformer on it 25-Sep-19 12:51 PM But no feedthroughs 25-Sep-19 12:51 PM Apparently it was a modular pump down station for bio reactor thin film glovebox stuff 25-Sep-19 12:51 PM ooh 25-Sep-19 12:52 PM It's probably my new general purpose chamber 25-Sep-19 12:52 PM It's got enough of on it 25-Sep-19 02:08 PM Jeez, your better off than I am with stuff atm then lol 25-Sep-19 02:08 PM Very nice score though. 26-Sep-19 03:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190926_125210-93AC9.jpg 26-Sep-19 03:55 AM I don't think I've ever seen this much free floor space in that room 26-Sep-19 03:56 AM Don't get used to it.XD 26-Sep-19 03:58 AM don't worry this will last a week tops 26-Sep-19 03:59 AM I agree with that estimation 26-Sep-19 03:59 AM My workshop has the same timentropy. 26-Sep-19 04:00 AM tim-entropy or time-ntropy? 26-Sep-19 04:02 AM Not-trophy, in any case. 26-Sep-19 04:02 AM We should not be proud of this. 26-Sep-19 04:03 AM I would be, if it was a sign that acutal work is being done 26-Sep-19 04:05 AM But the more work is done, the worse the wprkshop is, wich leads to less work done, but not to less mess. 26-Sep-19 04:05 AM tinderopy 26-Sep-19 04:06 AM it's called " thermal equilibrium" @Nixie 26-Sep-19 04:07 AM No, it't not, it's a runaway situation. You'll still work, but less and less, until the workshop is mostly disorder and you can't find any tools. For it to reach equilibrium, it would need to be self-organizing again, but who does that?? 26-Sep-19 04:07 AM Not me, for sure. 26-Sep-19 04:07 AM Damn, I am too metaphysical today. 26-Sep-19 04:07 AM XD 26-Sep-19 04:08 AM uheuheuhe 26-Sep-19 04:08 AM glad to have you back here, we kinda missed this 26-Sep-19 04:09 AM not great, not terrible 26-Sep-19 04:09 AM jk 26-Sep-19 04:09 AM YOU'RE AWESOME 26-Sep-19 04:09 AM how's the monowheel project goin? 26-Sep-19 04:39 AM ok 26-Sep-19 06:04 AM Sorry, i am kinda swamped at work. 26-Sep-19 06:04 AM Monowheel, you mean the unicycle? 26-Sep-19 06:04 AM Thanks @N00N 26-Sep-19 06:07 AM errrr yeah of course %) silly me 26-Sep-19 06:07 AM monocycle ehehehe 26-Sep-19 06:23 AM Very well, after 11h I can ride more or less ok. 26-Sep-19 06:23 AM Instill turn a bit wide, and right turns are very difficult (when I skated it was the same) 26-Sep-19 06:23 AM I still don't do freemount (i grab a column to get on top) 26-Sep-19 06:24 AM ok, that's cool 26-Sep-19 06:24 AM for 11h i mean 26-Sep-19 06:24 AM is there a practice using assistant wheels for i dunno a steeper learning curve? 26-Sep-19 06:26 AM I know people learn faster in 6 or 7 hours but...well, thats not me. 26-Sep-19 06:27 AM like there slowly bending away and incrementally you have to control more by your self 26-Sep-19 06:27 AM Hum...having a waist height wall to hold while going forward will definitely help. I didn't hve anything like that in the parking lot where I train, only columns. 26-Sep-19 06:27 AM and cars! 26-Sep-19 06:27 AM any cars? 26-Sep-19 06:27 AM pat pat pat 26-Sep-19 06:27 AM "sorry, sorrry! it's ok, sorryy" 26-Sep-19 06:28 AM Lots of cars, not my own to crash into, thoughm 26-Sep-19 06:28 AM Well, I could crash into my motorbike/gf car 26-Sep-19 06:28 AM But better not to. 26-Sep-19 06:28 AM yeah 26-Sep-19 06:28 AM Next week I'll start riding in the street 26-Sep-19 06:29 AM If kids bother me much, I'll just "fall" and let the unicycle fly toward them 26-Sep-19 06:29 AM yeah 26-Sep-19 06:29 AM you need a clowns costume 26-Sep-19 06:29 AM to make the whole thing extra scary for them 26-Sep-19 06:29 AM maybe they think twice before bothering you 26-Sep-19 06:42 AM XD 26-Sep-19 06:42 AM A chainsaw, i think it will be more effective 26-Sep-19 06:44 AM AND a chainsaw! 26-Sep-19 06:44 AM or 3 of them juggling - ok that's not that easy 26-Sep-19 06:44 AM but you could ask them if they want to help you juggling 26-Sep-19 08:32 AM I could cut some parts and juggle with them. 26-Sep-19 08:32 AM XDDd 26-Sep-19 08:32 AM Btw, did I mention that I was buying a new workshop? 26-Sep-19 08:32 AM (jumping to #off-topic-thats-sometimes-on-topic ) 26-Sep-19 10:11 AM got a few Carepages today <3 26-Sep-19 10:11 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190926_143538-691DB.jpg 26-Sep-19 10:11 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190926_143751-2025B.jpg 26-Sep-19 10:11 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190926_144544-978FA.jpg 26-Sep-19 10:11 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190926_144657-21886.jpg 26-Sep-19 10:11 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190926_163945-03AEB.jpg 26-Sep-19 10:20 AM Sexy! 26-Sep-19 10:22 AM thanks <3 26-Sep-19 10:31 AM do they prchrchrchrchrcht? 26-Sep-19 10:31 AM it would be so brutal to use such an electron beam irradiator as a fancy speaker 26-Sep-19 10:33 AM hell yeah they do 26-Sep-19 10:33 AM i knew that you could provide a video :> 26-Sep-19 10:33 AM I almost prefer that sound over the newer ludlums ticking 26-Sep-19 10:34 AM yeah more badass 26-Sep-19 10:35 AM only issue is that that one doesn't go above 1.6 kV 26-Sep-19 10:35 AM still have to play around with it a bit 26-Sep-19 10:37 AM were they cheap? 26-Sep-19 10:38 AM not the best deal but pretty good 26-Sep-19 10:38 AM 100 bucks a pop 26-Sep-19 10:38 AM Just don't think I bought 4 at once, and all for me ^^ 26-Sep-19 10:44 AM like doin 4-voice audio stuff with it 26-Sep-19 10:47 AM he should get some different sources and play "carol of the decay" for christmas. 26-Sep-19 11:01 AM :)) 26-Sep-19 11:01 AM hehe 26-Sep-19 01:07 PM @GigaSquirrel are the first pics an RGA? 26-Sep-19 01:07 PM aye! 26-Sep-19 01:14 PM Nice, I am off of work for a month starting today, though in a vector calculus class too... Want to take apart the RGA i got like a month back 27-Sep-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-09-27_14-31-26-7F432.jpg 27-Sep-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-09-27_14-31-27-81126.jpg 27-Sep-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-09-27_14-31-28_2-69A2A.jpg 27-Sep-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-09-27_14-31-28-F6574.jpg 27-Sep-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-09-27_14-31-29_2-9623D.jpg 27-Sep-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-09-27_14-31-29-40786.jpg 27-Sep-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-09-27_14-31-30_2-F70FC.jpg 27-Sep-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-09-27_14-31-30-174AE.jpg 27-Sep-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-09-27_14-31-31_2-7EA33.jpg 27-Sep-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-09-27_14-31-31-B3A7F.jpg 27-Sep-19 05:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-09-27_14-31-32-0E899.jpg 27-Sep-19 05:54 AM finally an useable connector, none of that type C rubbish 27-Sep-19 05:54 AM oh and I contacted the manufacturer of my RGA for information / software 27-Sep-19 05:54 AM wish me luck! 27-Sep-19 08:07 AM ahh, my turbo is back up and singing again 27-Sep-19 08:07 AM how I missed this 27-Sep-19 08:07 AM aaand I've got a leak somewhere 27-Sep-19 08:30 AM XDDDD 27-Sep-19 08:30 AM It's age, use pee pads. 27-Sep-19 08:30 AM The leak has developed by itself? 28-Sep-19 10:37 AM Altough I'm not going to build it soon, I have begun designing my glass lathe: 28-Sep-19 10:37 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-1B74A.png 28-Sep-19 10:37 AM Instead of having a mechanical link between the heads, they will have separate steppers linked to the same control (maybe add differential for some artistic purposes, but not as a general rule, 28-Sep-19 10:38 AM that looks pretty nice 28-Sep-19 10:39 AM I want the throats to be 101mm on the inside, 28-Sep-19 10:39 AM (bearins are a huge 110x140x16mm 28-Sep-19 10:39 AM I'm doing something different - since I have a metal lathe, I ordered a live MT2 3 jaw chuck(these are a thing!) for the tailstock, and will drive it with a stepper based on headstock encoder input 28-Sep-19 10:39 AM I don't want to use my lathe, as I don't want to risk de-hardening the ways with the heat. 28-Sep-19 10:40 AM I worked around that by never pointing it at the ways! :P 28-Sep-19 10:40 AM also fiberglass 28-Sep-19 10:40 AM or cer blanket 28-Sep-19 10:40 AM AND I don't want to have to mess with glass cloth on top, as I don't have it spot clean. XD 28-Sep-19 10:40 AM Also, the lathe only has 25mm throat, and I don't want to deal with that limitation. 28-Sep-19 10:40 AM (btw, that is 1000mm long) 28-Sep-19 10:41 AM for my work the metal lathe conversion is enough 28-Sep-19 10:41 AM far cheaper than actually building a glass lathe 28-Sep-19 10:42 AM Excellent, nothing wrong with that (have done it myself too a bit) 28-Sep-19 10:42 AM I need to figure out how to get sodium nitrite 28-Sep-19 10:42 AM Yeah, I expect about 700/1000€ in parts. 28-Sep-19 10:42 AM yep :( 28-Sep-19 10:42 AM sodium nitrite? (not an expert glass worker here) 28-Sep-19 10:43 AM to wash the oxides off the tungsten prior to pinch sealing 28-Sep-19 10:44 AM er, potassium nitrite 28-Sep-19 10:44 AM you can easily get potassium nitrate 28-Sep-19 10:44 AM but it's already in the maximum oxidation state 28-Sep-19 10:44 AM KNO2 vs KNO3 28-Sep-19 10:45 AM I'm a bit far still from even trying glass seals. (I used it to make a KF16 glass isolator for my vacuum chamber, that uses the endplates as A-K, and I didn't want the vacuum pump at potential for sputtering) 28-Sep-19 10:45 AM I made a tungsten seal on my first day of having tungsten 28-Sep-19 10:45 AM It even sealed! 28-Sep-19 10:45 AM nice! 28-Sep-19 10:45 AM Tungsten to borosilicate is really easy 28-Sep-19 10:45 AM at least single pins 28-Sep-19 10:46 AM I think I have tungsten wire somewhere in the workshop...can't remember where 28-Sep-19 10:46 AM there's a shop in germany that sells it cheap 28-Sep-19 10:46 AM a bit too far for me. 28-Sep-19 10:46 AM with shipping! :P 28-Sep-19 10:46 AM https://www.zivipf.com/epages/63862298.sf/en_GB/?ObjectPath=/Shops/63862298/Products/%22Wolfram%200.20%22/SubProducts/%22Wolfram%200.20-10m%22 28-Sep-19 10:46 AM You have all my envy 28-Sep-19 10:46 AM I'm in Belarus lol, I had to buy it from outside the country 28-Sep-19 10:47 AM HAHAHHA, that shop is for vapers, right? 28-Sep-19 10:47 AM mhm! 28-Sep-19 10:47 AM but they don't know they also sell glassblowing alloys 28-Sep-19 10:47 AM 52, 48 28-Sep-19 10:47 AM tungsten 28-Sep-19 10:47 AM XDD 28-Sep-19 10:47 AM Vaping has also brought nice ceramic tipped tweezers for cheap 28-Sep-19 10:47 AM 52 and 48 aren't very useful since they're for soda lime or lead glass 28-Sep-19 10:47 AM (for handling my silicon wafers) 28-Sep-19 10:47 AM but tungsten is useful! 28-Sep-19 10:48 AM I'll definitely keep an eye 28-Sep-19 10:48 AM will you mind if I pop questions your direction from time to time? 28-Sep-19 10:48 AM sure, but I am as much of a glassblowing noob as you are 28-Sep-19 10:48 AM @Charles is the guru here 28-Sep-19 10:48 AM he knows what he's doing 28-Sep-19 10:49 AM Noted! 28-Sep-19 10:49 AM I have lots to learn before I can attempt my vidicon conversion anyways 28-Sep-19 10:50 AM want to turn a vidicon into a sem? 28-Sep-19 10:51 AM Get ahold of Vacuum Sealing Techniques by A. Roth 28-Sep-19 10:51 AM It’s available online I think 28-Sep-19 10:52 AM Half, I want an e-beam drawing machine. 28-Sep-19 10:52 AM not much interested in microphotographs 28-Sep-19 10:52 AM Are you trying to seal to pyrex or Duran? 28-Sep-19 10:53 AM to nothing yet! no designs, no nothing, just general idea. 28-Sep-19 10:53 AM vidicons... so probably soda lime, which is horrible ;~; 28-Sep-19 10:53 AM (book noted!, I'll prefer it in paper, gonna look on abebooks) 28-Sep-19 10:53 AM Oh ok. That’s a good book for all matters vacuum sealing 28-Sep-19 10:53 AM thin, long soda lime tube 28-Sep-19 10:53 AM I'd probably gently flare it into a glass kf16 or kf25 fitting lol 28-Sep-19 10:54 AM It’s been reprinted by the American Vacuum Society so it’s available from regular sources 28-Sep-19 10:54 AM nono, not trying to reuse the vidicon tube, but make a whole new tube for the internal parts, so I can make the filament interchangeable, wich is the only drawback they have. 28-Sep-19 10:54 AM how are you planning to re-seal the glass stem? 28-Sep-19 10:54 AM Oh yes we already mentioned that. When you are ready I will send you some pre made leads. 28-Sep-19 10:55 AM I plan to make a Kf compatible tube, and then a KF plate with the connections. 28-Sep-19 10:56 AM My plan is to try turning a vintage electrostatic scope CRT into a low resolution SEM 28-Sep-19 10:56 AM so I can just stick it in the machinery 28-Sep-19 10:56 AM You two have fun. I have to run 28-Sep-19 10:56 AM then try the same thing with a vidicon 28-Sep-19 10:56 AM go, charles, go! 28-Sep-19 10:56 AM vidicons are much harder to drive 28-Sep-19 10:56 AM but in theory they should be much easier to hack into a nanofocus system 28-Sep-19 10:56 AM I wanted to go the CRT route, but ditched it in favor of direct vidicon 28-Sep-19 10:56 AM I have an electrostatic CRT tube I am not going to use, do you want it? 28-Sep-19 10:57 AM which one? 28-Sep-19 10:57 AM 3RP1A 28-Sep-19 10:57 AM the flat front one 28-Sep-19 10:58 AM oh that's actually pretty nice 28-Sep-19 10:58 AM I know, right? 28-Sep-19 10:58 AM I have TWO 28-Sep-19 10:58 AM but one is in a functioning scope 28-Sep-19 10:58 AM I'll let you know if I want it 28-Sep-19 10:58 AM I don't want to destroy good tubes yet 28-Sep-19 10:58 AM ok! 28-Sep-19 10:58 AM D 28-Sep-19 10:58 AM well, it was going to be destroyed here, so doesn't matter 28-Sep-19 10:59 AM apparently they're popular for use in oscilloscope clocks 28-Sep-19 10:59 AM in any case, I am not sure how well will it work for a SEM 28-Sep-19 10:59 AM Yeah, I know I could sell it for a decent amount, the flat faced ones get good pricing, but I don't wana mess with money. 28-Sep-19 10:59 AM as I was saying, the CRT spot will be much less concentrated than the vidicon spot 28-Sep-19 10:59 AM just because the vidicon has much longer focusing parts. 28-Sep-19 11:00 AM let's go to #general 28-Sep-19 11:00 AM (true!, forgot where I was) 29-Sep-19 01:13 PM http://diyhpl.us/~nmz787/pdf/smi3200/pics.html#delayerxeon with @AdamMcCombs 29-Sep-19 01:13 PM used the slope-etch feature of the FIB 29-Sep-19 01:13 PM Vacuum was screaming (good) this morning, source @ 4.5E-8 torr, chamber @ 7.2E-7 torr 29-Sep-19 01:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20190929_121216-5DE3B.jpg 29-Sep-19 01:36 PM How did you happen upon an entire FIB? 29-Sep-19 01:36 PM This seems like a thing that paying $10k for is a "steal" 29-Sep-19 02:07 PM eBay, lucky keyword search ('fib') 29-Sep-19 02:07 PM Actually to be clear, a friend paid $1.5k and I paid $3k to bring it 650 miles home. It was an amazing deal for sure. 29-Sep-19 02:07 PM So if 10k is a steal... I got the crown jewels I guess 29-Sep-19 02:07 PM ... Or some comparison more clever... 29-Sep-19 02:13 PM I at least, am glad you got it. 29-Sep-19 02:28 PM 6^-8 mbar is quite good 29-Sep-19 02:28 PM more than you'd need I think 29-Sep-19 03:01 PM Imaging will raise the pressure due to the etching 02-Oct-19 06:29 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191002_120835-1E96C.jpg 02-Oct-19 06:29 AM from now on only my own incompetence will stop me from building my own vacuum stuff! 02-Oct-19 06:29 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191002_132610-45F55.jpg 02-Oct-19 06:29 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191002_141418-0BAEC.jpg 02-Oct-19 03:41 PM Nice 03-Oct-19 05:37 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191003_143001-20D40.jpg 03-Oct-19 05:37 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191003_143408-B933E.jpg 03-Oct-19 05:37 AM @Pan Da learning how glue metal 03-Oct-19 07:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191003_152705-A3CE1.jpg 03-Oct-19 07:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191003_152758-36A1F.jpg 03-Oct-19 07:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191003_152815-D8EB2.jpg 03-Oct-19 07:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191003_153739-E107C.jpg 03-Oct-19 07:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191003_154611-86AEA.jpg 03-Oct-19 07:52 AM Oh man that looks like some really nice kit there. 03-Oct-19 07:55 AM oh yeah it is 03-Oct-19 07:55 AM best thing is 03-Oct-19 07:55 AM it has a sector analyzer instead of a quadropole 03-Oct-19 07:55 AM I wonder how well it can be changed to other mass ranges 03-Oct-19 07:55 AM @Deleted User I don't get where you get all your loud pumps from :P 03-Oct-19 08:33 AM Awesome! 03-Oct-19 08:33 AM Wish I had ANY money atm to get a residual gas analyzer... 03-Oct-19 08:33 AM Just spent $4200 to remove 9 trees off my property. 03-Oct-19 08:33 AM So yea no money atm ugh 03-Oct-19 08:40 AM that's not an RGA, but only a leak tester 03-Oct-19 08:40 AM measures pressure at 1 to 4 AMU (only at one mass, but it can be set in that range) to detect any He (or H2) in your system 03-Oct-19 08:43 AM I guess H2 is cheaper then He and being smaller, leaks better? 03-Oct-19 08:43 AM actually H2 is bigger 03-Oct-19 08:43 AM but cheaper 03-Oct-19 08:43 AM but also flammable 03-Oct-19 09:14 AM Ah. 03-Oct-19 09:14 AM It's cheap for a reason :P 03-Oct-19 10:20 AM @GigaSquirrel don't mock meeeeeeee :( 03-Oct-19 10:23 AM Right, I was just planning on buying an RGA myself off eBay thus why I mentioned it. But awesome. I wish I could find a cheap all in one leak tester but they go for some money ussually. 03-Oct-19 10:26 AM I'm going to sneak into your place and yoink all the quiet pumps 03-Oct-19 11:05 AM oh and I found another use for my tig welder 03-Oct-19 11:05 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191003_195316-E954B.jpg 03-Oct-19 11:05 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191003_195749-2960B.jpg 03-Oct-19 11:05 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191003_195939-EB23C.jpg 03-Oct-19 11:08 AM that's how bulk metal is made 03-Oct-19 11:08 AM except they use graphite electrodes 03-Oct-19 11:08 AM and they burn megawatts 24/7 03-Oct-19 11:08 AM if you use purge gas, you get very little loss and a controlled melt! 03-Oct-19 11:08 AM could be neat for making interesting alloys. 03-Oct-19 11:10 AM yep, my thoughts exactly 03-Oct-19 11:11 AM plus with purge gas, graphite crucibles don't spontaneously vanish 03-Oct-19 11:28 AM oh cool! What metal is that? 03-Oct-19 11:28 AM Also making me want to get a Tig now... 03-Oct-19 11:28 AM But alas still no money lol 03-Oct-19 11:30 AM Gold 03-Oct-19 11:30 AM some old gaskets from a very weird vacuum flange 03-Oct-19 11:53 AM Nice! I kinda figured but wasn't sure. 03-Oct-19 11:53 AM I actually have a really tiny amount of gold from some sponge contacts used for some old chips... 03-Oct-19 11:53 AM But even that melted down will be just a drop or so... 03-Oct-19 11:53 AM And they will likely just blow away with how thin and small they are. 04-Oct-19 04:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2743-62E74.JPG 04-Oct-19 04:35 PM Back on secondary SEM/cryo compressor cooling loop work. 04-Oct-19 04:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2745-DCAC0.JPG 05-Oct-19 09:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191005_171619-7787C.jpg 05-Oct-19 09:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191005_170003-5EFB1.jpg 05-Oct-19 09:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191005_171651-40765.jpg 05-Oct-19 09:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191005_165953-1908D.jpg 05-Oct-19 09:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191005_171639-B018F.jpg 05-Oct-19 09:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191005_165445-DDC9E.jpg 05-Oct-19 09:59 AM what the hell we pulled fully working russian night vision goggles from the scrapyard today xD 05-Oct-19 10:23 AM very nice 05-Oct-19 05:38 PM I regret not getting to see the scrapyard 06-Oct-19 02:23 AM well, we wanted to 06-Oct-19 02:23 AM but cern came up 06-Oct-19 02:23 AM guess you'll have to come back again 07-Oct-19 11:14 PM https://imgur.com/a/YQwPaMe 07-Oct-19 11:14 PM saw some mushrooms in my yard and told my kid to poke them with a stick, there was a spore print on one of the caps that was under another, so I grabbed some carbon tape and dabbed it on the spores, then folded the tape back onto itself to try and reduce the concentration (I was hoping I wouldn't rip all the spores, but maybe just a few)... then threw it into the load-lock and was getting images 5-10 mins later 07-Oct-19 11:19 PM casual microscopy 07-Oct-19 11:19 PM did you also mill the spores? 07-Oct-19 11:19 PM or is that just how the fib damages things in operation? 07-Oct-19 11:27 PM the FIB just does that, but I also intentionally dwelled a bit longer to see how quickly they would mill away (pretty fast, that GIF was probably 10 seconds or so of imaging, zoomed in means higher dose per sq area tho, so zoomed out is less fast) 07-Oct-19 11:27 PM the grainier images on the imgur link are for a lower beam current, so that wold mill significantly slower 07-Oct-19 11:27 PM but, they are also a bit grainy, I might have got a little better images if I'd played with the focus and stig a while longer... or maybe the spores were wet and would have dried out and cleared up the beampath a bit with more time in the vacuum 07-Oct-19 11:32 PM Does the FIB have an electron mode? 07-Oct-19 11:32 PM it uses an electron detector 07-Oct-19 11:33 PM But an ion source 07-Oct-19 11:33 PM but I don't have an e-gun on it, no 07-Oct-19 11:33 PM yeah 07-Oct-19 11:33 PM Ah, that explains it 07-Oct-19 11:33 PM the ion impact scatters secondary electrons, as well as ions 07-Oct-19 11:33 PM I thought fibs would commonly have an e-gun option as well 07-Oct-19 11:33 PM I can image electrons and ions, but the ion images aren't super good/interesting so far 07-Oct-19 11:33 PM To not destroy the device you're capturing 07-Oct-19 11:33 PM no, that's only the "new" ones 07-Oct-19 11:33 PM I've actually only ever worked on single-beam FIBs (2 different systems ever in my life so far) 07-Oct-19 11:34 PM There's a project for you, bolt an e-gun onto it 07-Oct-19 11:34 PM yeah 07-Oct-19 11:34 PM I am on the lookout for a column that might fit 07-Oct-19 11:34 PM the software has some buttons and options for controlling an e-beam 07-Oct-19 11:34 PM not sure how easy it would be to actually utilize that, but I'd like to find one way 07-Oct-19 11:34 PM or another 07-Oct-19 11:39 PM Assuming you have the schematics and it supports it somewhere 07-Oct-19 11:40 PM no, unfortunately 07-Oct-19 11:40 PM some of the connectors are reasonably labelled, but MUCH to be desired 07-Oct-19 11:40 PM I was able to figure out the service-mode password though after some investigation of the software... so I think I can at least tell the GUI to try scanning an e-beam (or something) 07-Oct-19 11:50 PM I also had my toddler sitting with me most of the time I was collecting those images... he cried a few times, I guess casual microscopy is too boring for him at this age (1.5)... hopefully I am not turning him away from lab stuff :/ 10-Oct-19 01:47 PM https://twitter.com/GigaBecquerel/status/1182381250138521601 10-Oct-19 01:48 PM @GigaSquirrel that's uh... nice 10-Oct-19 01:48 PM but that really did not need filler 10-Oct-19 01:48 PM that's a fusion weld 10-Oct-19 01:48 PM you'll want to grind the thing down to get rid of that nice soup of virtual leaks 10-Oct-19 01:49 PM getting mixed signals here, someone else told me Al has to be welded with filler 10-Oct-19 01:49 PM this really didn't need any filler 10-Oct-19 01:49 PM just a lot of purge gas 10-Oct-19 01:49 PM Yea I mean you want filler for aluminum for like a joint like a right angle for structure probably... and filling that corner... 10-Oct-19 01:49 PM but like something like that between two large masses and just wanting to SEAL it... yea probably just lots of purge, and patience 10-Oct-19 01:50 PM but all that pitting is definitely going to cause virtual leaks 10-Oct-19 01:50 PM But honestly I'd probably have made the same mistake... 10-Oct-19 01:50 PM so get to grindin 10-Oct-19 01:50 PM yeah I'll grind that down tomorrow 10-Oct-19 01:50 PM Yea if you sand/file it down you probably still have a great part there 10-Oct-19 01:50 PM I mean hey for first time welding it looks pretty good to me lol 10-Oct-19 01:50 PM I'll try preheating and fusion for the second hole tomorrow 10-Oct-19 01:50 PM at least you have enough filler in there to make use of that saying 10-Oct-19 01:51 PM especially since I haven't welded much in my life lol 10-Oct-19 01:51 PM "grinder and (no for vacuum) paint makes you the welder you ain't" 10-Oct-19 01:51 PM lol 10-Oct-19 01:51 PM at least you did it right by welding on the inside 10-Oct-19 01:52 PM hehe yeaaa 10-Oct-19 06:21 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2765-2DD0A.JPG 10-Oct-19 06:21 PM Finally got pretty much all the ISO/CF stuff on one shelf 10-Oct-19 06:21 PM Though I still have enough roughing pumps to crush a shelf and well a few larger chambers that are a bit awkward sitting off to the side. 10-Oct-19 06:54 PM What are the conical bits? 10-Oct-19 08:33 PM reducers? 10-Oct-19 09:37 PM To the left of the fridge? And just above the fridge to the left of the boxes are turbos. 10-Oct-19 10:06 PM I'm afraid it's turbos all the way down from here 11-Oct-19 01:39 AM The trouble with grinding is that if he didn't use enough heat, the weld is going to be superficial/just the fillerlumps so, when he fully grinds that down, it can crack/develop microfractures. I would have recessed down the insert so the filler just rounded the corner, but used filler nonetheless. For stainless, indeed, just a fusion weld would give superb results. 11-Oct-19 01:39 AM As for the porosity, superficially polishing it should do the trick. 11-Oct-19 01:57 AM I think I used too much heat 11-Oct-19 01:57 AM Also, @GigaSquirrel you have the cleaning % set too high, wich lessens the amount of heat that goes into the weld, heating the electrode instead (a photo of it would be nice to see) Ideally, the cleaning border (gray area) should be thin, like 1/3 of the one you have. 11-Oct-19 01:57 AM My welder doesn't go below 30% ep :/ 11-Oct-19 01:58 AM Many welders are confusing to setup that parameter. 11-Oct-19 01:58 AM but some times my arc was just too long, that might also make it bigger 11-Oct-19 01:59 AM Hmmm...not below 30% ep? 11-Oct-19 01:59 AM That is the minimum cleaning setting in the photo? 11-Oct-19 01:59 AM If it is, it might be inverted... 11-Oct-19 01:59 AM If I recall correctly mine is. 11-Oct-19 02:03 AM well it can to from 30 to 70%, so either way it's 30% cleaning min. 11-Oct-19 02:04 AM Will check mine later 11-Oct-19 02:07 AM me, too 22-Oct-19 11:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-10-22_20-06-54-4E653.jpg 22-Oct-19 11:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-10-22_20-06-55-F26EF.jpg 22-Oct-19 11:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2019-10-22_20-06-59-90861.jpg 22-Oct-19 11:09 AM too bad I have nothing to remove the oxide (yet) 22-Oct-19 11:09 AM don't want to do it purely mechanically 22-Oct-19 11:24 AM looks nice! 22-Oct-19 11:24 AM yea not sure what the best way to remove that is other than like... whatever its called where they use electricity to clean the surfaces 22-Oct-19 11:24 AM Thanks! 22-Oct-19 11:24 AM I know what it's called (at least in german) and where to get it, but I don't have any atm 22-Oct-19 11:47 AM HC-6U (SAL11) experiments from years back 22-Oct-19 11:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20131210_212032-117F9.jpg 22-Oct-19 11:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20131210_212915-AB528.jpg 22-Oct-19 11:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20131210_213004-51B83.jpg 22-Oct-19 11:47 AM for thin film stuff? 22-Oct-19 11:48 AM For example 22-Oct-19 11:48 AM in those examples I was just checking how much the crystals pull when I add some marker or HB lead pensil to them, (old ham trick). 22-Oct-19 11:48 AM its interesting how different some look from one another? or is that top vs bottom I am seeing? 22-Oct-19 11:49 AM Top vs. bottom + bad lightning (cheap fluoro and cellphone camera) 22-Oct-19 11:49 AM Those pictures are like +5 years old 22-Oct-19 11:49 AM I think I still had a nokia candybar running S60 3rd edition back then. 22-Oct-19 11:54 AM heh 23-Oct-19 10:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191023_193757-DF26F.jpg 23-Oct-19 10:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191023_194337-94B0D.jpg 23-Oct-19 10:46 AM well this sucks 23-Oct-19 10:52 AM (the only place where this phrase means success) 23-Oct-19 10:54 AM I really need the location of this strategic dumping ground for high tech 23-Oct-19 10:54 AM I will recruit a minion in Germany to hoard it all 23-Oct-19 11:01 AM You can’t pump down ? Is it a window you added in your cross section flange stuff ? 23-Oct-19 11:06 AM yep, to see it spin 23-Oct-19 11:42 AM Heh 23-Oct-19 11:45 AM Well fan spin means it works! As Louis Rossmann would say haha. Or just spin to win :P 23-Oct-19 11:50 AM works well, but the bearings sound unhappy 23-Oct-19 12:53 PM Drill a hole in your table and put it upright maybe ? 23-Oct-19 12:56 PM what, why? 23-Oct-19 01:09 PM "aLl tURb0s mUSt Be ruN VerTICalLY" which is far from true. 23-Oct-19 01:09 PM Also do you have it mounted or vibration dampened at all? it may not be bearings but more just vibrations carrying into the table real bad 23-Oct-19 01:09 PM even with mine bolted down I get some nasty noises out of my table 23-Oct-19 01:11 PM nope, it sounded "scratchy" 23-Oct-19 01:11 PM took it apart, there was some lose metal insite 23-Oct-19 01:11 PM looked like drops of solder 23-Oct-19 01:12 PM uhhhh 23-Oct-19 01:12 PM eugh... 23-Oct-19 01:12 PM I gotta figure out how to tear down some of my turbos that sat out in a dirty warehouse with no coverings for a long time... 23-Oct-19 01:12 PM I cleaned one the best I could without disassembly and I really don't think it will be enough. Scares me to take it apart though heh. 23-Oct-19 01:12 PM especially a theoretically good turbo 23-Oct-19 01:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191023_213515-2879C.jpg 23-Oct-19 01:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191023_213521-143FF.jpg 23-Oct-19 01:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191023_213044-63C6F.jpg 23-Oct-19 01:17 PM turbo drag is not scary, standard turbos have tons of different fins right? and generally they have to be aligned for balancing right? 23-Oct-19 01:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191023_213541-0E479.jpg 23-Oct-19 01:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191023_213107-7B383.jpg 23-Oct-19 01:17 PM eugh 23-Oct-19 01:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191023_221807-4C44E.jpg 23-Oct-19 01:19 PM this is a turbo Rotor for comparasion 23-Oct-19 01:19 PM both have to be ballanced, but a drag spins about half as fast as a turbo plus it has way lower rotor mass 23-Oct-19 01:27 PM is today turbo frustration day? 23-Oct-19 01:27 PM i am not surprised that it doesnt work but am a bit frustrated with mine too haha 23-Oct-19 01:27 PM https://i.gyazo.com/05fa0d2c05237184b38cd1c73b12aa17.jpg 23-Oct-19 01:27 PM was given that board out of a controller and set up the power supply...all the voltages seem right but no joy with the turbo spinning up 23-Oct-19 01:27 PM so now it is time for some deeper troubleshooting 23-Oct-19 03:44 PM That’s a molecular drag pump. It essentially drags the gas atoms along. A turbo pump relies on impact and deflection to most the gas along. Drag pumps are a much simpler design and work at higher pressures but have lower ultimate pressure. Turbos are way more sensitive to external stimuli but have much lower ultimate pressures. Old Welch drag pumps were actually belt driven from a regular AC motor and worked very well for metalizing, welding, and evaporation systems. 23-Oct-19 08:10 PM Oh. Look what I found hiding in a organizer drawer. Unopened krytox tube. 23-Oct-19 08:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_7351-7C4D6.jpg 23-Oct-19 10:15 PM Even these little tubes are like $29 each now! 24-Oct-19 02:21 AM What is that stuff? 24-Oct-19 04:36 AM Anti-oxydant grease ? 24-Oct-19 10:55 PM all the vitamins 24-Oct-19 10:56 PM it's got electrolytes! 24-Oct-19 11:13 PM ^^ 25-Oct-19 10:49 AM Another 6" conflat gate valve joins the party! 25-Oct-19 10:49 AM https://media.discordapp.net/attachments/529468991652233216/637345952532791306/DSC_2839.JPG 25-Oct-19 10:49 AM With bolt stubs too! though a single one is missing so I will have to find a replacement for that 25-Oct-19 10:49 AM this is just a 120V with endstop switches but a little stub moves in and out on the end so I could probably make up something to get a rough position for like quarter,half,3/4 throttling 25-Oct-19 11:05 AM ooh, it's a biggun 25-Oct-19 11:49 AM heh I have an 8" gate valve downstairs, and I have seen some 10 and 12 inchers around 25-Oct-19 12:04 PM @Conmega 's house will probably be the best episode of Hoarders ever. 25-Oct-19 12:08 PM pft, nah, I am actually working on downsizing the computer collection atm, or at-least focusing it and organizing it. 25-Oct-19 12:08 PM That HP-85 in the background there will be staying though :P 25-Oct-19 12:09 PM are 'tesla turbines' considered a drag pump? 25-Oct-19 12:44 PM -and- has anyone tried to use/make one for UHV 25-Oct-19 02:19 PM Sorry for the lateness. Krytox is a florinated grease or oil product that’s good for many uses. In vacuum systems sometimes it’s the only thing that will work. 25-Oct-19 02:19 PM Krytox - Wikipedia https://en.wikipedia.org/wiki/Krytox 25-Oct-19 02:22 PM Vacuum greases are still evil 25-Oct-19 04:46 PM @Noxz yes https://hackaday.com/2016/04/09/everymans-turbomolecular-pump/ 25-Oct-19 05:04 PM that hackaday project is misleading 25-Oct-19 05:04 PM all he did is spin up a hard drive with an acrylic cap and gave up 25-Oct-19 05:04 PM he showed a very inefficient centrifugal blower 25-Oct-19 08:00 PM All you need is some mspaint skills and copying other people's work and you can become a star too :P 26-Oct-19 01:39 AM Well the point was, someone tried 26-Oct-19 10:20 AM Someone tried without understanding the theory 26-Oct-19 02:29 PM Yup 26-Oct-19 03:06 PM Shiny arrived! 26-Oct-19 03:06 PM https://media.discordapp.net/attachments/529468991652233216/637734232751603772/DSC_2849.JPG 26-Oct-19 03:06 PM https://media.discordapp.net/attachments/529468991652233216/637734263319429140/DSC_2850.JPG 26-Oct-19 03:06 PM its a bit concerning it looks like the entire column is shifted to one side inside the conflat... it is insulated on the side connections so its not like its touching and shorting anything I don't think 26-Oct-19 03:06 PM I just wonder if I should try to straighten it or leave it and just try it 26-Oct-19 03:32 PM Hrm looks like more of the ceramic got broken in transit... 26-Oct-19 03:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2851-A931B.JPG 26-Oct-19 03:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2853-EEAC2.JPG 26-Oct-19 03:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2852-E986D.JPG 26-Oct-19 03:32 PM Also that's how it's shifted... Hrm 26-Oct-19 03:35 PM shifting is fine 26-Oct-19 03:35 PM the column is probably just plugged into a socket on the bottom end of the vacuum tube 26-Oct-19 03:35 PM they're meant to be replaceable 26-Oct-19 03:37 PM Yea I feel like the whole section of conflat normally goes though as one piece... Since I have seen acrylic protectors for just the tip of it. 26-Oct-19 03:37 PM The conflat ofcourse unplugs from the controller but thats not why it's shifted. 26-Oct-19 03:38 PM I bet it's a connector on both ends 26-Oct-19 03:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2854-6D4AB.JPG 26-Oct-19 03:38 PM otherwise how would they get the entire column into it 26-Oct-19 03:39 PM Uhm... The conflat unbolts and slides over it? 26-Oct-19 03:39 PM that would be how yes 26-Oct-19 03:39 PM now that I see it 26-Oct-19 03:39 PM But looking straight down I don't see any connections in any way. 26-Oct-19 03:39 PM It's just straight off the pass through 26-Oct-19 03:39 PM remove the conflat tube then 26-Oct-19 03:41 PM I could if I need to... I'm just wondering what that one line is for and how critical the insulation is on it. Worst case I guess I bend it straight and slide down a new piece of insulator once I get one. 26-Oct-19 03:41 PM Great this thing has a DS1230Y nonvolatile SRAM in it... Hope it's still good... Have to back up the contents on that before it's not good 26-Oct-19 04:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2859-C880E.JPG 26-Oct-19 04:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2860-2A0D6.JPG 26-Oct-19 04:41 PM Straightened that line and tightened the connection at the tip 26-Oct-19 04:41 PM I bet it'll be alright now 26-Oct-19 04:41 PM suck it down, give it some volts... 26-Oct-19 07:29 PM I was working on that, unfortunately I can't seem to for the life of me to get my little test setup to pump down well... I had a mix of conflat/iso/kf before so I simplified it, a brand new ISO to KF off the turbo then like some KF adapters/fittings to get gauges on and such and that almost seemed worse, the KFs I have are a bit battle worn I tried re-finishing the surfaces but that didn't help much, it may need further re-finishing since there were some deeper scratches 26-Oct-19 07:32 PM there's a dirty way to get around it temporarily 26-Oct-19 07:32 PM literally dirty - just wipe your fingers across the surfaces 26-Oct-19 10:52 PM Do you mean use your body oil as a virtual leak prone vacuum grease? 26-Oct-19 10:56 PM Oil, no, fat - yes 26-Oct-19 10:56 PM Very temporary, outgassy, but it'll seal a thin scratch 27-Oct-19 06:31 AM .(would be an awesome troll :3) 27-Oct-19 06:31 AM sealing leaks with literally elbow grease 28-Oct-19 03:26 PM @Conmega if you decide you want to replace those ceramics, i used this: https://www.mcmaster.com/8746k462 28-Oct-19 03:26 PM plus a dremel+diamond cutoff 28-Oct-19 03:37 PM awesome thanks! 28-Oct-19 03:37 PM god mcmaster really has everything haha 28-Oct-19 03:37 PM I don't like mcmaster 28-Oct-19 03:37 PM Mainly because they don't recognize anything outside the US exists 28-Oct-19 03:38 PM yeaaa... I went on there once to find something stupid like orings? 28-Oct-19 03:38 PM and they didn't have what I needed 28-Oct-19 03:38 PM or OH that was it 28-Oct-19 03:38 PM shaft seals 28-Oct-19 03:38 PM they didn't have the super standard size I needed, every other site did 28-Oct-19 03:38 PM my one friend absolutely LOVES mcmaster 28-Oct-19 03:38 PM like he gets almost everything from therelol 28-Oct-19 03:46 PM Sorta like Fluka has chokolate, VW has a sparepart number for bratwurst and Wurth has coffee? 29-Oct-19 10:00 AM y not 29-Oct-19 02:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191029_212740-46525.jpg 29-Oct-19 02:01 PM I'm a bit scared, but look at that oil, letting it run like that would not be the best idea either 30-Oct-19 10:35 AM just bought a chamber! https://www.ebay.com/itm/312563248926 30-Oct-19 10:39 AM Woo! That looks super weird 31-Oct-19 12:33 PM https://youtu.be/JTOgT7LW0Fk some ASMR for the evening 31-Oct-19 12:35 PM When the turbo is your gas load 31-Oct-19 12:35 PM hehe 31-Oct-19 12:35 PM still bottoms out my pirani at 2/3 full speed 31-Oct-19 12:36 PM the oil has a ridiculous amount of gas in it 31-Oct-19 12:36 PM most of it actually comes out of the turbo 31-Oct-19 12:36 PM space left by the old oil dripping out 31-Oct-19 12:36 PM that has to be filled with oil first 31-Oct-19 02:01 PM WOW, that's a lot of gas! 31-Oct-19 02:16 PM glad you got that going! 31-Oct-19 02:18 PM thanks ^^ 01-Nov-19 01:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191101_210450-5D2D1.jpg 01-Nov-19 01:06 PM I built my own macro torr with stuff from the 80s 01-Nov-19 01:38 PM did you... bolt a drag... onto a turbo? 01-Nov-19 01:38 PM perhaps 01-Nov-19 01:38 PM :DDDDDDDDDDDDD 01-Nov-19 01:38 PM this is so bad it's good 01-Nov-19 01:39 PM My university contacts so far have only yielded one vacuum bearing (so that I can add that rotatable shield to my sputtering setup) no scrap turbos, chambers or anything 01-Nov-19 01:39 PM I KNOW the d00ds have spare chambers, I have seen them in the accelerator labs 01-Nov-19 01:39 PM Nowdays I wonder if I got a radiation dose there, there ware some warning signs and tape at he floors "plz do not cross, too much radiation while the accelerator runs" 01-Nov-19 01:40 PM if it's a synchrotron, you probably got a few mSv 01-Nov-19 01:40 PM heh, nice 01-Nov-19 01:40 PM this is why you should always carry a dosimeter with you 01-Nov-19 01:41 PM I prefer to carry the radiation pager 01-Nov-19 01:41 PM tiny finger-sized PMT coupled to a chunk of CsI:Tl 01-Nov-19 01:41 PM detects a pack of WT-30 electrodes from 30cm away 01-Nov-19 01:42 PM oh, cute! 01-Nov-19 01:42 PM @Deleted User Just some linear thing 01-Nov-19 01:42 PM I have a whole box of radiation pagers 01-Nov-19 01:42 PM @Deleted User How much do those pagers cost 01-Nov-19 01:42 PM a lot 01-Nov-19 01:42 PM And what is needed to read or zero them? 01-Nov-19 01:42 PM if you have to ask... ^^ 01-Nov-19 01:42 PM they're scintillator based instruments 01-Nov-19 01:42 PM That's what I was afraid of 01-Nov-19 01:43 PM I bought one from a US ebay seller 01-Nov-19 01:43 PM it died 01-Nov-19 01:43 PM he sold a few dead units to me along with a working replacement 01-Nov-19 01:43 PM the "dead" units were perfectly functional, all but one 01-Nov-19 01:43 PM Oh nice 01-Nov-19 01:43 PM I think he might still have a few, I can give you a contact if you want 01-Nov-19 01:43 PM radiation pagers are just like tiny rate meters with a single-digit display and a settable alarm threshold 01-Nov-19 01:43 PM very sensitive though 01-Nov-19 01:47 PM Neat 01-Nov-19 01:47 PM https://www.ebay.com/usr/onestopsurplusshop 01-Nov-19 01:47 PM talk to this guy 01-Nov-19 01:47 PM ask him if he still has dead pagers 01-Nov-19 01:48 PM May I ask how much you paid approx. per unit? 01-Nov-19 01:48 PM I don't remember exactly, but I think it was around $20-60 per dead unit 01-Nov-19 01:49 PM If I'm gona drop triple digit euros on junk it's usually TETRA radios, preferably with TEA2 encryption options in the firmware. 01-Nov-19 01:49 PM I think he offered to sell the whole lot(10 or so?) at $20ish 01-Nov-19 01:49 PM they're 100% worth it just for the microPMT and scintillator combo 01-Nov-19 01:49 PM Oh neat 01-Nov-19 01:49 PM oooh 01-Nov-19 01:49 PM @GigaSquirrel you might want this too 01-Nov-19 01:49 PM split the bill :P 01-Nov-19 01:49 PM OK sneding /msg now 01-Nov-19 01:49 PM this thing somehow runs for a YEAR 01-Nov-19 01:49 PM on two AAs 01-Nov-19 01:49 PM running a photomultiplier! 01-Nov-19 01:50 PM ! ! ! 01-Nov-19 01:50 PM (at ~1.1kV) 01-Nov-19 01:50 PM my multimeter drops the voltage to 1.1V if you try to measure it lol 01-Nov-19 01:50 PM ohhh 01-Nov-19 01:51 PM it also runs an ancient PIC16C57, which you can decap and use UV to destroy the readout protection fuses 01-Nov-19 01:51 PM @GigaSquirrel get one for me too please (at <50$) 01-Nov-19 01:51 PM @rfs can you ask for one for me? 01-Nov-19 01:51 PM seeeeeeeeeee, everyone wants one now 01-Nov-19 01:51 PM Why don't they use solid-state (silicon) photomultipliers? No high voltage, low power consumption, essentially same quantum efficiency 01-Nov-19 01:51 PM @GigaSquirrel If he has a bunch, I'm goan order a bunch and I can then do IBAN/SWIFT and inter-EU shipping 01-Nov-19 01:52 PM hell yeah 01-Nov-19 01:52 PM not that Finnish shipping is that cheap unfortunatley 01-Nov-19 01:52 PM because SiPMs didn't even exist 01-Nov-19 01:52 PM this thing is OLD 01-Nov-19 01:52 PM (in its roots) 01-Nov-19 01:52 PM nothing like German shipping, <30eur for a 19" rack and so on. 01-Nov-19 01:52 PM oh and don't bother contacting the company that makes them 01-Nov-19 01:52 PM they're total аsshоles 01-Nov-19 01:52 PM :DDDD 01-Nov-19 01:53 PM Oh, they make scintillators coupled to PIN diodes as well. Less good than SiPMs, but for a rate meter it should be good enough 01-Nov-19 01:53 PM "this is us government only you can't have it" 01-Nov-19 01:53 PM @rfs please consider me too if you get some ^^ 01-Nov-19 01:53 PM then the guy CCs his partner in crime, INCLUDES ME IN THE EMAIL(by accident) and says "this is why we don't work with foreigners" 01-Nov-19 01:53 PM "I bet he's not even in the US" 01-Nov-19 01:53 PM all I did was ask to buy the spare parts 01-Nov-19 01:54 PM Oh well, I sent a message to the dude 01-Nov-19 01:54 PM while talking about lots. 01-Nov-19 01:54 PM Not "one unit" 01-Nov-19 01:55 PM yeah, if you ask to buy all of his dead meters, you'll get a great deal 01-Nov-19 01:55 PM if/when I get any I'll consider testing & re-shipping 01-Nov-19 01:55 PM if he still even has them, this was a few months ago 01-Nov-19 01:55 PM EU & EEA prefered, as is SWIFT/IBAN with PayPal as secondary 01-Nov-19 01:55 PM they're light and cheap to ship 01-Nov-19 01:55 PM around 150g each 01-Nov-19 01:55 PM ok 01-Nov-19 01:55 PM so 2kg should be under 50usd t oship 01-Nov-19 01:56 PM yeah 01-Nov-19 01:56 PM the micro PMT and scint combo is worth $100-200ish alone 01-Nov-19 01:56 PM hamamatsu 01-Nov-19 01:56 PM I've got two of these PIN diodes with CsI scintillators coupled to them 01-Nov-19 01:56 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-8E746.png 01-Nov-19 01:57 PM that's also hamamatsu 01-Nov-19 01:57 PM Yep, S8559 I believe 01-Nov-19 01:57 PM $70 a pop 01-Nov-19 01:57 PM I have a 1536-pixel long linear detector from hamamatsu 01-Nov-19 01:57 PM in tiny strips 01-Nov-19 01:57 PM @Deleted User oh sweet. 01-Nov-19 01:57 PM I think 128 pixels long 01-Nov-19 01:57 PM wait, only $70 for that whole combo? @Mason_Yu 01-Nov-19 01:57 PM that is CHEAP 01-Nov-19 01:58 PM Yeah, the wonders of eBay 01-Nov-19 01:58 PM oh, ebay, not new 01-Nov-19 01:58 PM :( 01-Nov-19 01:58 PM But only got two of them, new in bag. 01-Nov-19 01:58 PM There are cheaper ones that are Chinese copies 01-Nov-19 01:58 PM I haven't tested those yet though 01-Nov-19 02:00 PM 1010CE, was it? 01-Nov-19 02:00 PM I have a whole stack of those photodiodes 01-Nov-19 02:00 PM they're... disappointing 01-Nov-19 02:00 PM Didn't folks talk here or twitter about sputtering scintilating stuff on CMOS sensors? 01-Nov-19 02:01 PM sputtering is mostly pointless 01-Nov-19 02:01 PM I think it's something similar to that, but those are with scintillators. 01-Nov-19 02:01 PM plus I think CsI:Tl would decompose or lose its dopant 01-Nov-19 02:02 PM Yeah very possible 01-Nov-19 02:02 PM a vacuum chamber and turbo contaminated with thallium 01-Nov-19 02:02 PM mmmmm, tasty 01-Nov-19 02:02 PM :x 01-Nov-19 02:55 PM time to go back to anthracene 01-Nov-19 02:55 PM (we should try and keep general chatter isolated to the specific channels for it, also, fwiw. sorry to be That Mod) 01-Nov-19 03:19 PM sry ms. qualia. 02-Nov-19 11:17 AM My friend just randomly stumbled upon this in a dinky scrapyard he visits 02-Nov-19 11:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/40a1fbce-67f0-40bd-9b29-f58de9c72cb7-A6161.png 02-Nov-19 11:17 AM soviet high vacuum stuff 02-Nov-19 11:17 AM And yes, that is a huge ion pump 02-Nov-19 11:17 AM probably 100kg of stainless, but no magnets :( 02-Nov-19 11:17 AM of course I screamed at him to buy it all, and he did 02-Nov-19 11:19 AM Hell yeah, congrats! 02-Nov-19 11:19 AM I wonder what they even are 02-Nov-19 11:19 AM besides the totally obvious manual gate valve 02-Nov-19 11:19 AM that valve and chamber with feedthrough look nice 02-Nov-19 11:19 AM yup, that's what I'm hoping it is 02-Nov-19 11:19 AM machine the flanges to ISO 02-Nov-19 11:19 AM since they're all weird soviet standard flanges, pre-iso and pre-cf 02-Nov-19 11:19 AM or maybe even machine them to CF! 02-Nov-19 11:20 AM heh nice 02-Nov-19 11:20 AM from what I've been told machining cf can be a real pain 02-Nov-19 11:20 AM esp. if you can't put the thing on the lathe I imaginw 02-Nov-19 11:21 AM especially when you have no CNC mill capable of it 02-Nov-19 11:21 AM yep 02-Nov-19 11:21 AM if you can get some weld on flanges for cheap that might be an easier option 02-Nov-19 11:23 AM he's got tig 02-Nov-19 11:23 AM maybe you got some left over from that order? :D 02-Nov-19 11:23 AM heh, I wish! 02-Nov-19 12:42 PM Dang... 03-Nov-19 08:55 AM played around a bit with my pickling / electropolishing solution 03-Nov-19 08:55 AM and now I can get my parts cleaner than before welding 03-Nov-19 08:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_174959-FD04D.jpg 03-Nov-19 08:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_175455-D425F.jpg 03-Nov-19 12:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_123951-9C82B.jpg 03-Nov-19 12:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_124018-82A10.jpg 03-Nov-19 12:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_124131-6FA24.jpg 03-Nov-19 12:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_124034-1747C.jpg 03-Nov-19 12:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_124117-582C7.jpg 03-Nov-19 12:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_124142-8450E.jpg 03-Nov-19 12:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_124146-96076.jpg 03-Nov-19 12:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_124208-A56C5.jpg 03-Nov-19 12:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_124013-34E9C.jpg 03-Nov-19 12:52 PM This is the aluminum chamber supposedly from mass spec 03-Nov-19 12:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_125429-CDCA6.jpg 03-Nov-19 12:52 PM I think that's gas feedthrough on the left, a sample stage in the middle, and high(ish) voltage on the right 03-Nov-19 12:52 PM Now the question is, what sort of fittings does it use? This is flat, does that mean conflat? 03-Nov-19 12:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_125724-A2694.jpg 03-Nov-19 12:58 PM That's definitely not conflat 03-Nov-19 12:59 PM conflat would have the knife edge 03-Nov-19 12:59 PM What's the ID? 03-Nov-19 01:00 PM We really need some vacuum hacker lab posters, one with numbers lines for each pressure scale, and another with connector types 03-Nov-19 01:00 PM There's a few numbers etched into the metal 03-Nov-19 01:01 PM looks like something was pressed up against there but does not really look like an oring...maybe indium wire? 03-Nov-19 01:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20191103_130126-06BCB.jpg 03-Nov-19 01:02 PM Whatever it is I don't think it's very standard 03-Nov-19 01:02 PM I could of course be wrong 03-Nov-19 01:02 PM But iso and asa flanges don't have that kind of steeped o-ring seal 03-Nov-19 01:02 PM Also they usually have more than 4 bolts at this scale 03-Nov-19 01:03 PM Maybe this 03-Nov-19 01:03 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/15728150262291251866572435491860-9B9E9.jpg 03-Nov-19 01:08 PM Also it looks Oring to me with such a wide interaction area. Iridium usually doesn't get that wide or that perfectly circular 03-Nov-19 01:08 PM Hmm, well I guess I just need to measure it and buy some o rings 03-Nov-19 01:08 PM You also need a grouvs on the matting side 03-Nov-19 01:08 PM Maybe I'll barter with semion to teach me some maching to block off the open ports along with a turbo adapter 03-Nov-19 01:09 PM Unless it's by some miracle iso centering ring sisezed 03-Nov-19 01:09 PM Which might make sense if the flange has that slight step in it 03-Nov-19 01:13 PM hmm, ok, will check them out first then 03-Nov-19 01:17 PM If you can use centering rings the machining is going to be easier 03-Nov-19 01:17 PM Because then you don't need o-ring groves, just the centering grove. Making a flat plate smooth enough to seal is easier than making a grouve seal 03-Nov-19 01:20 PM mmm, ok, makes sense 03-Nov-19 02:04 PM an oring definitely makes more sense with the perfect circle but i wonder why an oring would leave that almost metallic looking residue...maybe just the photos/flash? 03-Nov-19 02:04 PM also...i hope nobody is trying to use Iridium gaskets... isnt that a bit hard and brittle? 03-Nov-19 02:06 PM That kind of greyish residue is pretty common 03-Nov-19 02:06 PM Also lol yeah I meant indium 03-Nov-19 02:06 PM That residue comes right off with a bit of alcohol and a kimwip 05-Nov-19 12:22 PM from dead hall sensors in a basically free turbo to this: https://www.youtube.com/watch?v=0GtzAfm8IG8 05-Nov-19 12:22 PM Pretty excited that it has some signs of life 05-Nov-19 12:22 PM still need to set it up and pump it down 05-Nov-19 12:25 PM that sounds pretty smooth 05-Nov-19 12:25 PM how'd you go about fixing the halls? 05-Nov-19 12:30 PM Brute force 05-Nov-19 12:30 PM I dug the old ones out and soldered some new ones in 05-Nov-19 12:30 PM cleaned the flux off? 05-Nov-19 12:30 PM yep, everything got good cleaning with 99% iso 05-Nov-19 12:31 PM good 05-Nov-19 12:33 PM iso will still outgas a bit, generally if you only have iso instead of good ethanol you want to do a distilled or preferably de-ionized water rinse, cut 50/50 with mr clean if you have it. 05-Nov-19 12:33 PM at-least that is what I learned from Adam 05-Nov-19 12:33 PM but yea that turbo looks and sounds great! congrats on the fix 05-Nov-19 12:34 PM given that it was an ebay find with unknown history i am expecting it to outgas a ton at the start 05-Nov-19 12:34 PM yea, just still something to keep in mind going forward :) 05-Nov-19 12:34 PM cleaned it as best i could but theres only so much you can really do 05-Nov-19 12:34 PM I personally would have thought 99% iso to be 100% fine before Adam educated me haha 05-Nov-19 12:34 PM yea, It looks pretty clean as is 05-Nov-19 12:34 PM I know I have some turbos that sat out on shelfs completely open in a dirty warehouse for a long while... 05-Nov-19 12:35 PM my turbo has a uniform layer of schmoo all over it ;~; 05-Nov-19 12:35 PM those things are nasty 05-Nov-19 12:35 PM I cleaned one the best I could but yea eugh 05-Nov-19 12:40 PM now i just need some more $40 (shipped!) or less turbos to show up on eBay haha 05-Nov-19 01:46 PM congrats on the repair! 05-Nov-19 02:24 PM Honestly the alcohol is more of a sem/tem specific thing 05-Nov-19 02:24 PM You can use a bunch of iso and still pull down to vacuum just fine 05-Nov-19 02:24 PM It's just in sem you have to worry about hydrocarbon contamination 05-Nov-19 02:24 PM The beam will deposit carbon down on the sample if you have hydrocarbons outgassing nearby 05-Nov-19 02:48 PM fair enough! 07-Nov-19 02:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191107_231133-7180E.jpg 07-Nov-19 02:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191107_231141-8FFE4.jpg 07-Nov-19 02:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191107_232200-3CABD.jpg 07-Nov-19 02:29 PM I'm a bit scared to be honest 07-Nov-19 02:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191107_232554-85134.jpg 07-Nov-19 02:46 PM looking good :) 07-Nov-19 02:54 PM thanks ^^ 07-Nov-19 02:54 PM I'm a bit scared of drilling in my chamber 07-Nov-19 02:55 PM I like that you covered the ports with tape 07-Nov-19 02:55 PM But you're about to put shavings inside it 07-Nov-19 02:55 PM its only there to prevent scratches 07-Nov-19 02:55 PM :P 07-Nov-19 02:55 PM and because I will need to fill the whole thing with argon to weld it 07-Nov-19 03:38 PM huh? you need to weld it from the inside right? I guess you can't use the shielding gas with the tig torch due to the angle the torch would have to be at in there? 07-Nov-19 03:38 PM guess the shielding gas would be a bit pointless at that angle? 07-Nov-19 03:39 PM I'll try to weld from the inside, but it will be a very awkward position 07-Nov-19 03:39 PM and since I can't grind in there in case anything goes wrong I'd like to purge it completley 07-Nov-19 03:39 PM the flooding is not strictly needed, that's true 07-Nov-19 04:58 PM argon is cheap enough and its not that much volume so its reasonable 07-Nov-19 04:58 PM you could stick a rubber glove over the one opening to stick your hand in while working lol, would seal everything in and allow you to still reach in 07-Nov-19 04:58 PM just have to be a very large rubber glove :P 08-Nov-19 01:03 AM Very large rubber "glove". 08-Nov-19 01:03 AM (had to make fun of it, but yes, thats an excellent idea) 08-Nov-19 01:04 AM one glove for my hand, a window, a blind flange and a high current and gas feedthrough for my torch? 08-Nov-19 05:15 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191108_114010-832E3.jpg 08-Nov-19 05:15 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191108_114037-7B8E2.jpg 08-Nov-19 05:15 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191108_140835-E9F5E.jpg 08-Nov-19 05:15 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191108_141355-9B2B5.jpg 08-Nov-19 05:15 AM all of a sudden my chamber looks so small xD 08-Nov-19 06:51 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191108_154810-CC244.jpg 08-Nov-19 06:51 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191108_154333-19353.jpg 08-Nov-19 06:51 AM well that wasn't scary at all 08-Nov-19 06:51 AM https://media.tenor.com/images/9ac5ce019717c5ec553dcfe6f7d79f86/tenor.gif 08-Nov-19 08:05 AM haha looks fantastic! hope it passes leak test :) 08-Nov-19 08:41 AM thanks! 08-Nov-19 08:41 AM still have to clean it 08-Nov-19 07:43 PM do you grind your welds? 08-Nov-19 07:43 PM maybe only if heavy in slag (or whatever the term may be) 09-Nov-19 01:05 AM He is welding with TIG, makes no slag to speak of (but you can just add too much filler and leave a very ugly weld). 09-Nov-19 01:06 AM if I used any filler ^^ 09-Nov-19 01:07 AM you could 09-Nov-19 01:07 AM That's the point. 09-Nov-19 01:08 AM yep ^^ 09-Nov-19 01:08 AM tho I should start grinding the outside of my chamber, had a bit too much heat input and it started looking ugly 09-Nov-19 07:39 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191109_135846-2C142.jpg 09-Nov-19 07:39 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191109_150425-0AC87.jpg 09-Nov-19 07:39 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191109_154335-5432F.jpg 09-Nov-19 07:39 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191109_154505-2B354.jpg 11-Nov-19 01:39 AM No explanation given... 11-Nov-19 02:22 AM the rest will come once I can work more on this project :P 11-Nov-19 02:22 AM it's part of my rotary welding tablee, the last pic shows the spindle and chuck 12-Nov-19 02:31 AM How are you going to do the electrical ground? 12-Nov-19 02:33 AM wrap a thick cable around the free part in the middle 12-Nov-19 02:33 AM OR scratch the motor, let the bearings carry the current and make it turn as a bearing motor 12-Nov-19 03:05 AM How about a graphite clamp? 12-Nov-19 04:23 AM sounds good, but I can't find any on ebay? 12-Nov-19 04:23 AM got a link? ^^ 12-Nov-19 05:07 AM Sorry, it is...dun dun dunnnnn...DiY 12-Nov-19 05:07 AM Buy a graphite block, drill, cut in half, make a leaf spring, clamp axle. 12-Nov-19 06:00 AM not those graphite blocks! 12-Nov-19 06:01 AM XD 12-Nov-19 06:09 AM whoops 12-Nov-19 06:09 AM and I was wondering why the spinde got warmer as I got them closer... 16-Nov-19 09:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191116_155737-9633D.jpg 16-Nov-19 09:50 AM starting early with christmas Decoration 16-Nov-19 09:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191116_173711-AE2FD.jpg 16-Nov-19 09:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191116_174812-1BD64.jpg 16-Nov-19 11:37 AM your diff pump christmas tree? 16-Nov-19 11:46 AM hehe, nope 16-Nov-19 11:46 AM copper plating a 3D printed housing for a PMT 17-Nov-19 11:45 AM What did you do to make the print conductive for plating? 17-Nov-19 11:51 AM @piGuy https://gigabecquerel.wordpress.com/2019/07/18/how-to-copper-plate-everything/ 17-Nov-19 12:04 PM Ah, okay. Looks a lot easier than the electroless copper plating technique I've tried. 17-Nov-19 12:07 PM what did you try? Something like applied ion did? 17-Nov-19 03:07 PM caustic etch -> SnCl -> PdCl -> Electroless copper bath 17-Nov-19 04:41 PM Making Christmas Gifts 17-Nov-19 04:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-530B3.png 17-Nov-19 04:54 PM Haha 17-Nov-19 11:01 PM @piGuy yep, that sounds like what applied ion did 17-Nov-19 11:01 PM my PLA prints aren't 100% tight, so they sponge up a lot of the electrolyte 17-Nov-19 11:01 PM might be a bit expensive to was so much Pd ^^ 18-Nov-19 07:57 AM Considered adding a step with filler to reduce the amount of wicking? 18-Nov-19 07:58 AM I'm not sure I understand what you mean by that 18-Nov-19 07:58 AM "step with filler"? 18-Nov-19 07:58 AM you mean more infill? 18-Nov-19 08:02 AM adding a step in the production 18-Nov-19 08:02 AM using car body filler to smoothe out the print 18-Nov-19 08:02 AM i guess 18-Nov-19 08:02 AM i think brian oltrogge used CA glue for that, so that might work for smaller parts 18-Nov-19 08:02 AM then some sanding, then continue as usual 18-Nov-19 08:53 AM Yeah, thats what I meant 19-Nov-19 03:32 AM nickel electroplating formula with saccharin 19-Nov-19 03:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-CE4D7.png 19-Nov-19 04:08 AM but that's nickel 19-Nov-19 04:42 AM oops 19-Nov-19 04:42 AM I am tired 19-Nov-19 07:21 AM the floor is now nickel 19-Nov-19 01:42 PM I'm going to try electroless nickel plating a 3D printed SLA part today 19-Nov-19 01:42 PM good luck! 19-Nov-19 01:43 PM neat! can't wait to see how that turns out 19-Nov-19 03:14 PM Let us know the recipe if it's acceptable quality! 19-Nov-19 06:47 PM Well the first attempt was a partial bust. I was able to plate nickel on the part, but not where I wanted. I guess the plating bath works. 19-Nov-19 06:47 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-A7963.jpg 19-Nov-19 06:47 PM I used my plasma wand to treat the part... It didn't plate at all where I treated it. Bottom of the support base for the print got the most nickel.... 19-Nov-19 06:47 PM The nickel that did plate on seems pretty well adhered. Probably a cleaning/etching issue... 19-Nov-19 08:32 PM Second try worked great! 19-Nov-19 08:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-7AE1E.jpg 19-Nov-19 08:32 PM Only a few small spots that didn’t plate. The nickel really highlights the printing issues I’ve been having with my Form 3 printer. 19-Nov-19 08:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-89755.jpg 19-Nov-19 09:33 PM Cool! 19-Nov-19 10:15 PM that's awesome :D 19-Nov-19 10:18 PM Damn, that looks great! 19-Nov-19 10:31 PM Electrical conductivity and surface adhesion are good. 19-Nov-19 10:32 PM :/ 19-Nov-19 10:32 PM but hey, it's a start! 19-Nov-19 10:32 PM I said they're good! 19-Nov-19 10:33 PM ...wow 19-Nov-19 10:33 PM I have no Idea why I read "bad" 19-Nov-19 10:33 PM what the hell, brain 19-Nov-19 10:33 PM sorry, I just got up, a bit ahead of my usual schedule 19-Nov-19 10:34 PM No worries. 19-Nov-19 10:35 PM but in that case congrats! 19-Nov-19 10:35 PM Now you can electroplate ontop of it 19-Nov-19 10:35 PM woot 19-Nov-19 10:35 PM plate it gold baby 19-Nov-19 10:35 PM :P 19-Nov-19 10:41 PM You can do it too with just 12 simple chemicals: sodium carbonate, sodium metasilicate, sodium lauryl sulfate, potassium hydroxide, palladium chloride, tin chloride, hydrochloric acid, sodium hydroxide, nickel sulfate hexahydrate, trisodium citrate, ammonium chloride, sodium hypophosphite 19-Nov-19 10:41 PM and water 19-Nov-19 10:44 PM do you have a writeup about concentrations etc? 19-Nov-19 10:44 PM and how did you activate the surface? 19-Nov-19 10:44 PM just the plasma wand? 19-Nov-19 10:48 PM I'll try to do a nice writeup soon. Activation and etching is done with a fairly high concentration KOH solution (400g/L) at 45C for 30 min 19-Nov-19 10:48 PM No plasma wand. Did not produce results. 19-Nov-19 10:51 PM oh, interesting! 19-Nov-19 10:51 PM maybe you need a hotter plasma 19-Nov-19 10:52 PM Might need to investigate plasma wand treatment with the SEM to see if it's properly etching the surface. 20-Nov-19 06:39 AM If you are doing surface activation with nonthermal atmospheric plasma, treatment time depends on plasma intensity. Shouldn't be hot, but rather a large quantity 20-Nov-19 06:39 AM That's why I prefer to build my own systems. Dirt cheap, way higher power and more activation area 20-Nov-19 06:39 AM Was able to activate Teflon quite easy 20-Nov-19 07:00 AM Here is the write up page for the 1kW surface treatment/activation unit I built from scraps. Second video shows treatment and activation of nonstick parchment paper as a demo: http://appliedionsystems.com/diy-high-power-gliding-arc-discharge-plasma-treater/ 20-Nov-19 07:00 AM I'd like to eventually put something like this on some sort of 3 axis system to do automated treatment. Regular xy for large flat surfaces, or a rotational stage for complex geometries 20-Nov-19 12:18 PM @piGuy very nice! 20-Nov-19 12:18 PM @Applied_Ion neat system! Why didn't you use a vacuum chamber? Did you specifically need the directionality? Didn't need even activation? Or just wanted something quick and easy? 20-Nov-19 12:21 PM Nonthermal atmospheric plasma activation is it's own seperate process, doesn't require any vacuum. That's the beauty of it - dirt simple to build, and allows you to activate surfaces very effectively still. It's a process that is actually used in textile and printing industries. Well suited for production line processes where the parts to be coated pass through the plasma before coating, printing, gluing, etc 20-Nov-19 12:21 PM Actually flame activation is used as well, where you pass the part through the oxidizing portion of a flame. However, that can cause heat damage, so nonthermal plasmas can be used instead. Depending on the intensity, activation times will differ. Usually in terms of strength from low to high, it goes dielectric barrier discharge, gliding arc, blown ion. My vortex stabilized nonthermal system that I use for plasma enhanced combustion studies is more intense still, and would activate faster than the wide arc one, though much smaller volume covered 20-Nov-19 12:21 PM The great thing about the treatment is that it is highly directional, so you can have very fine control of activation 20-Nov-19 12:21 PM But these types of plasmas cam be used for tons of things, they are highly versatile. Sterilization, hydrocarbon reforming, volatile destruction, surface treatment, combustion, etc 20-Nov-19 12:21 PM Gliding arc systems are by far the easiest to build, and are at the higher power scale than other processes like dielectric barrier discharge. There are some specialized systems that use microwave discharge or high rep rare nanosecond pulse discharges, but these are mire complex. I personally am a big fan of gliding arc due to the simplicity and versatility. Both planar as well as coaxial vortex setups allow you to do a lot. 20-Nov-19 12:33 PM But surely you have a vacuum chamber 20-Nov-19 12:33 PM Wouldn't a vacuum process be more even in activation? 20-Nov-19 12:36 PM Not necessarily. You will be able to do plasma cleaning in addition to surface activation with a vacuum plasma, so in that regard a vacuum plasma system is "better". But that is also a much more thermal process. And for activation, you only need to raise the surface energy of the substrate higher than the energy of the applied coating 20-Nov-19 12:36 PM You wouldn't need to activate paper or small plastic parts in a vacuum system for simple coatings or gluing 20-Nov-19 12:36 PM This type of activation is again more ideal for heat sensitive parts, or rapid production lines. Again, very different manufacturing process on its own. Different applications than would be seen with a vacuum plasma cleaner 20-Nov-19 12:36 PM To put it in perspective, Teflon is probably one of the most difficult surfaces to activate, with incredibly low surface energy 20-Nov-19 12:36 PM Atmospheric plasma activation is plenty enough for this. Of course you will want your parts clean and oil free prior regardless 20-Nov-19 12:42 PM Is a vacuum"more thermal" because you have less gas to absorb the plasma heat? 20-Nov-19 12:45 PM You are getting direct ion bomardment at much higher energies. Parts in plasma cleaners heat up quite a bit. Nonthermal atmospheric plasma are nonthermal due to being in non equilibrium where the bulk ion temperature is substantially lower than the electron temperature. 20-Nov-19 12:45 PM Typical vacuum plasmas are more in equilibrium 20-Nov-19 12:45 PM Again, very different plasma regimes between the two processes 20-Nov-19 12:45 PM Nonthermal plasmas are usually described in atmospheric applications. Vacuum plasmas can be nonthermal in the sense if they are weakly ionized, but usually vacuum plasma cleaners are pretty high power and have high density 20-Nov-19 12:55 PM Hmm, interesting. I cleaned something in air plasma a week or so ago, it was noted that it was hot 20-Nov-19 12:55 PM (the item) 20-Nov-19 12:55 PM I gave it like 3 or 4 minutes with my plasma wand, though I didn't do any kind of cleaning process prior to that. I figured a few minutes in plasma would remove any oil droplets etc that could be on the surface. 20-Nov-19 01:24 PM The plasma wand might not be high enough intensity to really do anything lol 20-Nov-19 01:26 PM It's supposed to be 30W output 20-Nov-19 01:27 PM Mine is 1kW lol. I can treat stuff for a long time and it just gets a bit warm 20-Nov-19 01:27 PM 30W won't do much, if anything really, you will be sitting there for a very long time 20-Nov-19 01:40 PM My handheld system here is 90W. Still kind of slow, and that's still with direct plasma exposure 20-Nov-19 01:40 PM http://appliedionsystems.com/diy-handheld-gliding-arc-discharge-plasma-surface-treater/ 22-Nov-19 09:05 AM https://twitter.com/GigaBecquerel/status/1197856240304578560 22-Nov-19 09:05 AM this hurt a bit 22-Nov-19 09:05 AM but now I have some CF flanges I can weld into my chamber 22-Nov-19 09:05 AM maybe get the RGA going 22-Nov-19 09:08 AM yes! 24-Nov-19 05:50 AM the rotary welding thingy is coming together nicely! 24-Nov-19 06:25 AM nice 24-Nov-19 06:35 AM https://twitter.com/ConnorKrukosky/status/1198610771254693888 24-Nov-19 06:35 AM Working on figuring out the wiring into the machine I am retrofitting and have to throw this 6i24 into this dell 24-Nov-19 06:38 AM good luck! 24-Nov-19 06:41 AM thanks! 24-Nov-19 07:33 AM niceee 24-Nov-19 07:34 AM Hehe, thanks! 24-Nov-19 07:34 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191124_163712-CC959.jpg 24-Nov-19 07:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191124_165355-7C583.jpg 24-Nov-19 08:56 AM Is that using a mig or TIG? I’m also curious how it would work with a brazing torch. 24-Nov-19 08:56 AM that's TIG 24-Nov-19 08:56 AM I'm afraid a brazing torch has way to little heat output to achieve any reasonable speed 24-Nov-19 09:28 AM oh wow, the welder I've been eyeing is on sale, ends tonight 24-Nov-19 09:28 AM https://www.eastwood.com/tig200acdc.html 24-Nov-19 09:28 AM $650 24-Nov-19 09:28 AM it used to be like 700 normally, and 600-ish when on sale, but they bumped up the price when they learned how much more they could make 24-Nov-19 09:28 AM that may just be the christmas present to myself I need... 24-Nov-19 09:28 AM already have a small-ish tank of argon from chemistry stuff 24-Nov-19 09:28 AM may have to think on that.. also, we're talking maybe 50-100$ worth of savings.. not crazy or anything, but from what I understand it's decent quality overall.. maybe minus the crap foot pedal, but yeah 24-Nov-19 09:28 AM and clamp 24-Nov-19 09:28 AM I mean, after a mask and jacket and gloves, etc etc.. you're still looking at like $1k USD to get into it 26-Nov-19 03:29 PM ooh.. i've been looking for a welder in around that pricerange 26-Nov-19 03:30 PM I regret learning on a nice Miller now 27-Nov-19 01:01 AM I think it lacks a bit of precise control. It will work for sure, just...don't know, I don't like dials. 27-Nov-19 01:01 AM But yes, to fet into TIG, it's about 1K to get into. 27-Nov-19 01:01 AM I prefer this one: 27-Nov-19 01:01 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/51omG-3ZX8L-2638F.png 27-Nov-19 01:12 AM https://www.ebay.com/itm/SOLDADOR-SOLDAR-INVERTER-TIG-ACDC-200-DIGITAL-ALU-AMP-PULSADO-HF/382168499266?hash=item58fb048442:g:KXUAAOSw~I5ZjA5Y 27-Nov-19 01:12 AM 620$ 27-Nov-19 01:22 AM top thing above lacks soo many controls I would not want to miss 27-Nov-19 01:22 AM ac, pulse, taper, etc 27-Nov-19 02:16 AM You just like mine, admit it 27-Nov-19 02:16 AM XDDDDDDDDDD 27-Nov-19 02:16 AM (The Eastwood one comes with a pedal, that mine doesn't (has connector, but no pedal)) 27-Nov-19 03:36 AM I have basically the same 27-Nov-19 03:36 AM 'tho in a cooler blue 27-Nov-19 03:36 AM :P 27-Nov-19 04:12 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20191122071000232_L-61358.jpg 27-Nov-19 04:12 AM I'm getting this itty diff pump at some point heh. 27-Nov-19 04:12 AM I just can't figure out what flange is on the thing... the bolt pattern is too sparse to be conflat but it for the life of me looks like conflat! 27-Nov-19 04:12 AM like 4.5" conflat 27-Nov-19 04:12 AM eh probably just some iso or something, I think what it attached to was just via viton so 27-Nov-19 04:12 AM Will need an adapter but will be good for some small thing 27-Nov-19 04:13 AM well it doesn't look like iso 27-Nov-19 04:13 AM but it's so cute! 27-Nov-19 04:14 AM https://www.lesker.com/newweb/flanges/jpg/Photo_TechnicalNote_Figure7B.jpg 27-Nov-19 04:14 AM is that an ion gauge right below the Outlet? 27-Nov-19 04:14 AM could be this style iso 27-Nov-19 04:14 AM https://www.lesker.com/newweb/flanges/flanges_technicalnotes_iso_1.cfm 27-Nov-19 04:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20191122071000266_L-9C29F.jpg 27-Nov-19 04:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20191122071000303_L-57E50.jpg 27-Nov-19 04:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20191122071000340_L-ABDBF.jpg 27-Nov-19 04:14 AM those are the photos I have 27-Nov-19 04:14 AM I think its something off the test fixture it was on 27-Nov-19 04:14 AM trying to find the listing for that other bit it clearly went to 27-Nov-19 04:18 AM but ISO ist just a flat end / 90° edge, the pump almost looks like it has a cutting edge 27-Nov-19 04:18 AM yea I know right? 27-Nov-19 04:18 AM but it looks like its more like 4.5" but 4.5" conflat has 8 bolt holes... there is no way you can align a 6 bolt hole and 8 bolt hole pattern 27-Nov-19 04:18 AM looks too spread apart to be 2.75" 27-Nov-19 04:19 AM yep 27-Nov-19 04:19 AM weird thing 27-Nov-19 04:19 AM maybe it can be 2.75"? just the holes are smaller and throwing me off? just weird proportions 27-Nov-19 04:19 AM or oh maybe its the 3.38" standard 27-Nov-19 04:19 AM no... thats also 8 bolt holes 27-Nov-19 04:20 AM I'd love to help you, but have zero intuition how big 3.38" are xD 27-Nov-19 04:21 AM here.... this is what that stuff came off of clearly 27-Nov-19 04:21 AM https://hgrinc.com/productDetail/Electrical/Used-Test-Fixture-Attachment/10191840035/ 27-Nov-19 04:21 AM this may be related 27-Nov-19 04:21 AM https://hgrinc.com/productDetail/Electrical/Used-Test-Fixture-Attachment/10191840034/ 27-Nov-19 04:21 AM there is no cutting edge on the other side... 27-Nov-19 04:21 AM like but clearly the diff pump fitted to that one part and that other... gauge thing? came off the other side 27-Nov-19 04:21 AM theres even a throttle valve on the tube hooking to the body of that thing 27-Nov-19 04:21 AM I'd also love to know what that second thing is with two electrical connections... a gas? feed and thats it... 27-Nov-19 04:23 AM I'll look into it once I'm home, I've used up my high Speed volume 27-Nov-19 04:23 AM ah no problem heh 27-Nov-19 04:23 AM I'm not going to be-able to pick all this stuff up until January 27-Nov-19 04:23 AM (which also means I can make a bigger pile oops) 27-Nov-19 04:23 AM :P 27-Nov-19 04:36 AM hehehe 27-Nov-19 05:30 AM nah dang it that site is blocked 27-Nov-19 05:41 AM hrm leme just get photos 27-Nov-19 05:41 AM https://images.hgrinc.com/inventory/1119/1019184/20191122071000681_L.JPG 27-Nov-19 05:41 AM Does that come through? 27-Nov-19 05:41 AM https://images.hgrinc.com/inventory/1119/1019184/20191122071000790_L.JPG 27-Nov-19 05:41 AM https://images.hgrinc.com/inventory/1119/1019184/20191122071000754_L.JPG 27-Nov-19 05:41 AM https://images.hgrinc.com/inventory/1119/1019184/20191122071000532_L.JPG https://images.hgrinc.com/inventory/1119/1019184/20191122071000570_L.JPG https://images.hgrinc.com/inventory/1119/1019184/20191122071000605_L.JPG 27-Nov-19 05:41 AM Let me know if you can see those @GigaSquirrel 27-Nov-19 05:44 AM aye, works! 27-Nov-19 05:44 AM they look more like car parts than high vac stuff 27-Nov-19 05:49 AM car parts? lol 27-Nov-19 05:49 AM I've worked on lots of vehicles and you rarely ever see brass/bronze/copper(other than wires) in vehicles haha 27-Nov-19 05:50 AM well yeah the material doesn't fit, but esp. the first part could be an exhaust pipe 27-Nov-19 05:50 AM lol I guess, weird looking exhaust system 27-Nov-19 05:50 AM better than weird looking vac chamber 27-Nov-19 05:50 AM any Idea what the triangles on the last thing are? 27-Nov-19 05:52 AM no idea 27-Nov-19 06:50 AM that diff pump is so pretty 27-Nov-19 06:52 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-0FF38.png 27-Nov-19 06:52 AM now without f*ed up pins! 27-Nov-19 07:15 AM woot! 27-Nov-19 07:17 AM I think I can go into mass production 27-Nov-19 07:17 AM looks at ebay 27-Nov-19 07:17 AM hmm, 300 bucks a piece? 27-Nov-19 07:17 AM xD 27-Nov-19 07:22 AM heh 27-Nov-19 07:24 AM @Conmega that's parts from a leak detector. The part with the bends is the mass filter, ion trap, and ion gun. The big round cylinder is a cryo trap. The dif pump might be made for counter flow operation as a mass filter 27-Nov-19 07:34 AM ahhh that makes a ton of sense since all those leak detectors came in 27-Nov-19 07:34 AM cool, good to know, I don't really NEED those parts since I think I'll be getting a whole leak detector from them when they get cheaper 27-Nov-19 07:34 AM but the diff pump was just too cute 27-Nov-19 07:35 AM I looks very similar to the one I took apart 27-Nov-19 07:35 AM Probably same brand 27-Nov-19 07:35 AM Different model 27-Nov-19 07:37 AM neat 27-Nov-19 10:36 AM @Conmega those are parts from a Veeco MS170 as far as I can tell...lemme look up the pump model number 27-Nov-19 10:36 AM Think it is the same as mine 27-Nov-19 10:36 AM Veeco EP3AB 27-Nov-19 10:36 AM "Veeco EP3AB 170 L/s air cooled 4 stage fully fractionating stainless steel body and thermo insulation collar. Fractionation assures that only the lowest vapor pressure fractions of the pumping fluid are fed to the top jet to give the highest possible vacuum. Foreline tolerance exceeds 500 microns. Optically dense foreline baffle minimizes loss of diffusion pump oil." 27-Nov-19 10:36 AM Theirs seems to be missing the foreline baffle 27-Nov-19 10:36 AM the tube thing with angles is a Cee Tube btw 27-Nov-19 10:36 AM other part has the diffusion pump flange stuffed with paper and a valve between it and the cold trap. also a cold cathode discharge gauge there 27-Nov-19 02:17 PM I'm not seeing that diff pump as "cute" here... Maybe I'm too ignorant of various diff pumps and their features 27-Nov-19 02:18 PM it's absolutely tiny 27-Nov-19 02:18 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191127_231939-68F92.jpg 27-Nov-19 02:18 PM just like this one 27-Nov-19 02:21 PM Hmm, seems pretty similar to the one on my sem 27-Nov-19 02:21 PM Maybe 30% smaller? 27-Nov-19 02:22 PM about as big as this one? https://www.youtube.com/watch?v=jGXwFL-_WYk 27-Nov-19 02:41 PM Hmm, yeah that looks similar, my tree maybe a bit shorter 27-Nov-19 02:41 PM Been a few years since i cleaned mine 27-Nov-19 02:41 PM The oil in that pump looks pretty clean, but very thick 27-Nov-19 02:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMAG0022-C10CC.jpg 27-Nov-19 04:20 PM @nmz787 clear or clean? 27-Nov-19 04:20 PM If it's clear and thick, probably silicone. 27-Nov-19 04:20 PM @GigaSquirrel that heat break is adorable. 27-Nov-19 04:57 PM @Deleted User both 27-Nov-19 04:58 PM Then it's good silicone oil 27-Nov-19 04:58 PM Hmm, gigasquirrels video description says he's sure it's not silicone 27-Nov-19 05:00 PM Some synthetic siliconey stuff 28-Nov-19 12:06 AM yeah no the old stuff is not Si based 28-Nov-19 12:06 AM Leybold diffelen is basically just mineral oil 28-Nov-19 09:01 AM @Conmega This is what the foreline baffle for that Veeco diffusion pump you posted up the other day, looked like it was missing from the one in your photo so I figured showing you what it is supposed to look like might help out: https://i.gyazo.com/60db76de9b111dd64f1dc4576b1f0bec.png 28-Nov-19 09:01 AM @GigaSquirrel Here is a Cee Tube diagram that shows what the tube with angles has going on in it. 28-Nov-19 09:01 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/CeeTube-0AD43.png 28-Nov-19 09:03 AM ohhh, it's a sector analyzer ❤️ 28-Nov-19 09:03 AM didn't expect these things to be magnets 28-Nov-19 09:03 AM They are pretty strong too 28-Nov-19 09:03 AM think that is why they have the sheet metal shields over top 28-Nov-19 09:03 AM i have been trying to think if there are any cool projects worth trying out with the one i have 28-Nov-19 03:17 PM cool 28-Nov-19 03:17 PM thanks 29-Nov-19 10:54 AM slowly but surely it's all coming together! 29-Nov-19 10:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191129_193212-66AAA.jpg 29-Nov-19 10:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191129_194959-8BCAE.jpg 29-Nov-19 10:54 AM what surprises me most ist that I have no significant leaks in there 29-Nov-19 10:54 AM first time welds in the chamber and some feedthroughs 29-Nov-19 10:54 AM but it all just works? 29-Nov-19 10:54 AM I'm a bit afraid that that means it will die later 29-Nov-19 11:43 AM maybe I can gift activated silver coins for christmas 29-Nov-19 11:43 AM https://www.orau.org/ptp/collection/medalsmementoes/dimes.htm 30-Nov-19 05:47 AM lucky hehe, my first few chambers have had major leaks... at-least I assume its the chambers and not the turbo somehow hahaha 30-Nov-19 05:47 AM But I have a rough idea of where some of mine have gone wrong and such 30-Nov-19 09:16 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-AF2BE.png 30-Nov-19 09:16 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-E5710.png 30-Nov-19 01:14 PM Your uh 30-Nov-19 01:14 PM Resistor is leaking 30-Nov-19 01:15 PM yeah I think it did not like that 30-Nov-19 03:35 PM Yeah. No bueno. Hahahaha. You need one of those glass encapsulated Victoreen resistors for that sort of thing. We threw away many of them from M.U. Cause nobody wanted them. 01-Dec-19 12:02 AM nah, I just need a higher wattage one 01-Dec-19 05:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191201_141833-6A93D.jpg 01-Dec-19 05:44 AM well, things happened 01-Dec-19 05:44 AM I learned some things 01-Dec-19 05:44 AM my power supply has too high of an output capacitance, so at lower pressures the plasma ignites, the voltage drops and the supply can't keep up 01-Dec-19 05:44 AM secondly: even if you can't see a plasma at 30 kV the geiger counter definitely can see something 01-Dec-19 05:44 AM learned thing the third: 50 mA is a lot and now the holder of my grid has molten and fell down 01-Dec-19 05:44 AM I am so glad I had the valve to my turbo 90% closed 01-Dec-19 06:45 AM dang, lucky turbo. 01-Dec-19 06:45 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-BC05C.png 01-Dec-19 06:45 AM first steps in the gated loading port. 01-Dec-19 06:52 AM yay! 01-Dec-19 07:09 AM I have to work a lot on it 01-Dec-19 09:11 AM sigh 01-Dec-19 09:11 AM and the grid dropped again 01-Dec-19 09:11 AM I remade the holder from WCu, that hold up just fine, but the connection behind is Al 01-Dec-19 09:11 AM need to replace that with something 01-Dec-19 09:12 AM doesn't it get quite hot in there? o-o 01-Dec-19 09:13 AM V1.5, Looking better. 01-Dec-19 09:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-B35A8.png 01-Dec-19 09:14 AM yeah, glowing red hot 01-Dec-19 09:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-A61CB.png 01-Dec-19 09:14 AM @Nixie how will you move the flap? 01-Dec-19 09:14 AM and I've not even put the max current / power through that chamber 01-Dec-19 09:19 AM Just shortened it 20mm 01-Dec-19 09:19 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-32770.png 01-Dec-19 09:19 AM The movable platform is 15x15mm anyways 01-Dec-19 09:19 AM the flap will move with a glass feedthrough and something pulling on it. 01-Dec-19 09:19 AM XD 01-Dec-19 09:22 AM how does the oring stay in the grove? lots of vacuum grease? 01-Dec-19 09:22 AM It may be better to put the oring on the surface in the tube not on the moving piece 01-Dec-19 09:22 AM the cutout for it that is 01-Dec-19 09:22 AM yes, but that would make it extremely complex to do on my machinery 01-Dec-19 09:22 AM my CNC is pretty small, not sure I can make it reach it that deep. 01-Dec-19 09:24 AM hrm, well you'd need sine blocks to hold the tube in place I guess at the right angle 01-Dec-19 09:24 AM you need to machine the flat in there anyway right? 01-Dec-19 09:24 AM nono, not workholding 01-Dec-19 09:24 AM yes, but I can machine the flat in my manual mill 01-Dec-19 09:24 AM ah I see 01-Dec-19 09:25 AM I can always ask someone with a good CNC with reach, to mill the groove afterwards, so that would not be an issue. 01-Dec-19 09:25 AM Although I suppose they use an oring and grove on large gate valves 01-Dec-19 09:25 AM no idea, never seen one upclose 01-Dec-19 09:25 AM I am guessing you just need to get the grove on the plate to be JUST the right size for the oring so it fits in tight 01-Dec-19 09:25 AM not like super tight but like it hold in under its own pressure 01-Dec-19 09:26 AM exactly, 01-Dec-19 09:26 AM also having the oring being slightly shorter can hold it enough 01-Dec-19 09:26 AM we'll see. 01-Dec-19 09:26 AM ^^ 01-Dec-19 09:27 AM I think the slightly shorter thing may be a bad idea? I don't think you want to "stretch" the oring. I can't remember all the rules of hand to dos and don't for orings. I just know there is a lot of science behind it hehe. 01-Dec-19 09:28 AM ah, I mean, a mm short of nominal measurement 01-Dec-19 09:28 AM not really stretching the oring much. 01-Dec-19 09:29 AM I think a problem comes in where the pressure is pushing it towards that edge as it is so if you open it with a pressure difference it may want to suck in and roll over that edge? I am not 100% sure 01-Dec-19 09:30 AM The plan is to make a passthrough valve to equalize pressures and allow gradual vacuum 01-Dec-19 09:30 AM ah ok 01-Dec-19 09:31 AM (or be able to feed argon to protect the filament in the pumpdown) 01-Dec-19 10:30 AM https://www.parker.com/literature/O-Ring%20Division%20Literature/ORD%205705%20Parker%20O-Ring%20Vacuum%20Sealing%20Guide.pdf 01-Dec-19 10:30 AM @Nixie for your o-ring groove design stuff 01-Dec-19 10:42 AM @Nixie you might be designing a bicycle 01-Dec-19 10:42 AM Those VAT valves are exactly what you're drawing 01-Dec-19 10:42 AM Just buy one and mod it. 01-Dec-19 10:43 AM That seems like it might be a good option for him. I can go check out what the clearance is through the normally open one i was sent by mistake 01-Dec-19 10:43 AM the big ones have a lot of clearance 01-Dec-19 11:25 AM I took apart my vat valve, it would not be easily moddable for it to do what I want, without making the setup extremely long. 01-Dec-19 11:25 AM I don't have the money to throw at valves, but I do have stock material, and time, meanwhile I'm jobless, to actually try fabricating that. 01-Dec-19 11:53 AM Just made a shorter version 01-Dec-19 11:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-D34F6.png 01-Dec-19 11:54 AM Have you looked into loadlocks? 01-Dec-19 11:54 AM They're often sold in the "business end only" form on eBay 01-Dec-19 11:55 AM As I expressed before: 01-Dec-19 11:55 AM I don't have the money to throw at [things], but I do have stock material, and time, meanwhile I'm jobless, to actually try fabricating that. 01-Dec-19 11:55 AM The "business end only" ones are pretty cheap 01-Dec-19 11:55 AM But yeah 01-Dec-19 11:55 AM This will be a tough project 02-Dec-19 10:46 AM It's been so long, I forgot the difference between KF16 and KF25...so I had to modify the breechloader to make it KF16 on one side (for the glass manipulator) 02-Dec-19 10:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-DE851.png 02-Dec-19 10:46 AM (the T mounted on top of the turbo is KF25 and I had totally forgot) 02-Dec-19 11:23 AM How are you going to open the flap inside? 02-Dec-19 11:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-B56EE.png 02-Dec-19 11:24 AM Using the thick magnetic actuator and a flexible wire/spring steel. 02-Dec-19 11:25 AM At that surface area your magnetic actuator won't hold 02-Dec-19 11:25 AM I can just add magnetic stages to give it strenght 02-Dec-19 11:25 AM Remember that you're going to have atmospheric pressure pressing it in from one side 02-Dec-19 11:25 AM what? 02-Dec-19 11:26 AM No magnetic stage will let you open that up while under vacuum 02-Dec-19 11:26 AM No, it will all be at vacuum 02-Dec-19 11:26 AM the entire thing? 02-Dec-19 11:26 AM I will add a passthrough valve to equalize pressure. 02-Dec-19 11:26 AM I said it the other day. 02-Dec-19 11:27 AM just as an FYI 02-Dec-19 11:27 AM and an argon valve to actually put pressure in, and not explosively compress the gate. 02-Dec-19 11:27 AM this corner isn't machinable 02-Dec-19 11:27 AM https://i.spirit.re/BExn5.png 02-Dec-19 11:27 AM LOL, yes, it is machinable, let me show you the complete piece. 02-Dec-19 11:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-DAD96.png 02-Dec-19 11:29 AM opened up from the top? 02-Dec-19 11:29 AM I only have to tilt the piece 45º 02-Dec-19 11:29 AM yes, it has a glass top. 02-Dec-19 11:29 AM right, that'll work 02-Dec-19 11:29 AM I want to inspect the piece before closing/leaving vacuum, in case I want a second pass, or something. 02-Dec-19 11:29 AM Polishing that surface is going to be fun, though. 02-Dec-19 11:30 AM machine, tumble/blast, electropolish? 02-Dec-19 11:30 AM could send it to @GigaSquirrel for electropolish, yes. 02-Dec-19 11:30 AM will use a good, new endmill for that operation in any case. 02-Dec-19 11:30 AM I'll have the glass window cut from a borosilicate disc 10mm in thickness at a glass shop nearby. 02-Dec-19 11:30 AM if lucky, I can even get it polished on the sides for a nice view. 02-Dec-19 01:06 PM I can't really electropolish (yet), just remove the colors and defects from welding 02-Dec-19 02:15 PM Well, get better at it, then. Chop, chop! 02-Dec-19 02:36 PM @GigaSquirrel what electrolyte are you using (or going to use) for polishing and what type of stainless, 316 I’d guess yah? 02-Dec-19 02:36 PM found cool paper while procrastinating I can send you on using deep eutectic solvents for electropolishing 316 02-Dec-19 02:36 PM easy to get components too just choline chloride and ethylene glycol 02-Dec-19 03:15 PM I want to electropolish 316 too! 02-Dec-19 03:34 PM http://ecst.ecsdl.org/content/77/11/1199.abstract 02-Dec-19 03:34 PM 1:2 molar composition of Choline Chloride to Ethylene Glycol at 70*C . Hold at 2.5-3 V vs SCE 02-Dec-19 03:34 PM That was the ideal condition from the paper, gave average surface roughness <1 um 02-Dec-19 10:45 PM 1:1 H3PO4 : H2SO4 02-Dec-19 10:46 PM do you run a 2 or 3 electrode setup 02-Dec-19 10:46 PM I use a carbon brush 02-Dec-19 10:47 PM and steel as the anode? 02-Dec-19 10:47 PM what voltage 02-Dec-19 10:48 PM no, literally just dunk the brush in the acid and brush it on, with 5-10 amps cc 02-Dec-19 10:50 PM ohhh 02-Dec-19 10:50 PM was thinking you were submerging and doing echem in like a tank or something 02-Dec-19 10:52 PM nope, that would be "real" electropolisching, but I don't want liters and liters of the acid mix 02-Dec-19 10:52 PM that’s why I think the recipe I sent might be cool to try 02-Dec-19 10:52 PM Once I finish this semester I will 02-Dec-19 10:53 PM yep, it sounds promising 02-Dec-19 11:35 PM The brush doesn't fling acid around all over? 02-Dec-19 11:37 PM depends on how you use it, I'm not jackson pollock 03-Dec-19 03:43 PM @piGuy ever do an electroless nickel writeup? A friend wants to half-silver acrylic for a two way mirror project 03-Dec-19 04:38 PM Here's the recipe: https://forum.formlabs.com/t/nickel-plated-prints/25459 05-Dec-19 03:20 PM Holy bag of chips batman! 05-Dec-19 03:20 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191205_152016-C75FA.jpg 05-Dec-19 03:21 PM Fib em all 05-Dec-19 03:22 PM ahhh heh all marked with the epoxy blob of death 05-Dec-19 03:22 PM IE these failed test 05-Dec-19 03:22 PM Well 05-Dec-19 03:22 PM Use the fib 05-Dec-19 03:22 PM I've got a stack of wafers that came from uh... unnamed sources that are quite new technology node heh 05-Dec-19 03:22 PM complete wafers though, not stabby things 05-Dec-19 03:23 PM Upset global chip markets by filling the market full of reworked chips 05-Dec-19 03:23 PM I still need to fib those uh, chips from un named sources 05-Dec-19 03:24 PM Lol 05-Dec-19 03:24 PM $12.50 from Ukraine 05-Dec-19 03:24 PM Will definitely be fibbing them 05-Dec-19 03:24 PM I love everything about that 05-Dec-19 03:24 PM I have questions as well 05-Dec-19 03:25 PM One has a piece of wire hanging off a solder blob 05-Dec-19 03:25 PM you ask questions you don't get chips 05-Dec-19 03:25 PM That generally seems to be how it works 05-Dec-19 03:25 PM I did just pick up a 1080ti for fib 05-Dec-19 03:26 PM lmao wut 05-Dec-19 03:26 PM That checks notes someone ran over 05-Dec-19 03:26 PM uhhhh 05-Dec-19 03:26 PM OK 05-Dec-19 03:26 PM Yeah 05-Dec-19 03:26 PM you can keep them away from my computer 05-Dec-19 03:26 PM One of my friends is a surveyor 05-Dec-19 03:26 PM And they were in a theme park parking lot 05-Dec-19 03:26 PM And it was just there 05-Dec-19 03:26 PM Only one side was squished 05-Dec-19 03:26 PM Once again so many questions 05-Dec-19 03:26 PM So little answers 05-Dec-19 03:28 PM was it EVGA brand? 05-Dec-19 03:28 PM I don't think so 05-Dec-19 03:28 PM But I'll check 05-Dec-19 03:29 PM if its EVGA that explains it... 05-Dec-19 03:29 PM their stuff is so bad.... and fails so hard... and just yea 05-Dec-19 03:29 PM I have a friend who will take any and all EVGA hardware for range practice 05-Dec-19 03:30 PM Zotac 05-Dec-19 03:30 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191205_153117-24DD4.jpg 05-Dec-19 03:30 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191205_153112-86A86.jpg 05-Dec-19 03:31 PM hrm its a low end brand but still a 1080ti... guess it failed on someone and they let their frustrations out 05-Dec-19 03:31 PM jeez 05-Dec-19 03:33 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191205_153303-97FD6.jpg 05-Dec-19 03:33 PM god 05-Dec-19 03:34 PM Yeah 05-Dec-19 03:34 PM Lol for a second i thought you got a fib that is so advanced it uses a 1080ti 05-Dec-19 03:34 PM Lol 05-Dec-19 03:34 PM Other way around 05-Dec-19 03:34 PM Got jealous like, I've got a 1080ti and all it does it play YouTube 05-Dec-19 03:35 PM But yes 05-Dec-19 03:36 PM Wait so you did get a fib? 05-Dec-19 10:04 PM I want a fib and I don't even know why or what I would do with it. 06-Dec-19 01:48 PM The electronic air control valve I bought years and years ago on AliExpress 06-Dec-19 01:48 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191206_134736-5BBFC.jpg 06-Dec-19 11:55 PM Had to align the inner holographic portion (a piece of 150micron thick nickel electroformed sheet metal) to within about 30 microns of error, centered in the outer window. 06-Dec-19 11:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191206_235423-26A6C.jpg 06-Dec-19 11:55 PM This holder/jig is a sandwich with a window cutout in the center of the top and bottom halves. This will go into a wire EDM machine to cut the inner holographic portion out of the surrounding sheet metal (which is being clamped in this pic) 06-Dec-19 11:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191206_235611-1A071.jpg 06-Dec-19 11:55 PM Doing the alignment by hand was... Challenging 06-Dec-19 11:55 PM Basically used strips of the sheet metal, poking from the sides to nudge it into alignment 07-Dec-19 12:00 AM Looks great 07-Dec-19 12:02 AM Now I'm gonna throw it in my FIB to image the corners, so I can characterize the heat affected zone that the EDM will induce 07-Dec-19 12:32 AM @nmz787 Remember that talk of micromachining? This seems like a perfect use for a pulsed laser for cutting. 07-Dec-19 12:32 AM Femtosecond if you want zero HAZ 07-Dec-19 12:32 AM HAZ? 07-Dec-19 12:32 AM o heat affected? 07-Dec-19 12:34 AM yes 07-Dec-19 01:01 AM Welp, jammed my load lock arm 07-Dec-19 01:01 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191207_010039-BCA1E.jpg 07-Dec-19 01:44 AM Going to try putting my stage in again with something a little thinner this time 07-Dec-19 01:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191207_014326-0912B.jpg 07-Dec-19 03:46 AM https://youtu.be/y1xV-htQP0A 07-Dec-19 03:46 AM https://youtu.be/aRoQwpbU9VM 07-Dec-19 09:51 AM Is that image distortion normal? 07-Dec-19 10:39 AM I had some settings a bit outside of normal conditions because there machine hasn't been used in about a month, but after using it a few hours I think that wasn't affecting what you're seeing. I think that's just normal for being zoomed out all the way. Once you zoom in a bit there's no distortion. Basically the company optimized the lenses for the detail work, not this relatively low-magnification. 07-Dec-19 10:39 AM I suppose it's possible that there's some adjustment to correct that, but the service manual has been withheld from me by the manufacturer. 08-Dec-19 06:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191208_133228-5E3A7.jpg 08-Dec-19 06:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191208_133606-5AD1F.jpg 08-Dec-19 06:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191208_133615-D820A.jpg 08-Dec-19 06:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191208_133906-BDC81.jpg 08-Dec-19 06:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191208_134823-8B86F.jpg 08-Dec-19 06:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191208_152909-D3E20.jpg 08-Dec-19 06:44 AM so far I had no luck bringing it below e-2, but that might just be outgassing 08-Dec-19 06:44 AM the thing has an unknown history and was unused for a looooooong time 08-Dec-19 06:44 AM and if I close the valve to the pumps pressure only rises veeeeery slowly 08-Dec-19 07:47 AM lovely 08-Dec-19 10:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191208_171040-B8922.jpg 08-Dec-19 10:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191208_171048-6C101.jpg 08-Dec-19 10:06 AM I got somewhere with the thing 08-Dec-19 10:06 AM it now pumps down nicely and is willing to open the recipient valve 08-Dec-19 10:06 AM but it won't start emission on the ms :/ 08-Dec-19 01:02 PM Leak detector? 08-Dec-19 01:02 PM Leak detector! 08-Dec-19 01:02 PM hopefully, one day... 08-Dec-19 01:02 PM I've fixed the vacuum stuff and now I have to figure out why it won't start up the ms 08-Dec-19 01:02 PM maybe both filaments are dead 08-Dec-19 01:02 PM maybe the controller has issues 08-Dec-19 01:07 PM Leak detector, leak detector, does whatever a leak detector does Blows the filament, screams about leaks Leak detector 08-Dec-19 01:09 PM very old thing with unknown history 08-Dec-19 01:09 PM and I got it from a guy who doesn't know sh... about what he's doing 08-Dec-19 01:09 PM does that guy have any more things he has no idea about? :P 08-Dec-19 01:10 PM lots 08-Dec-19 01:10 PM lots 08-Dec-19 01:10 PM lots 08-Dec-19 01:11 PM I humbly request a detailed inventory 08-Dec-19 01:11 PM If they're cool things, I also humbly request you give him $1 for each 08-Dec-19 01:12 PM I'd love to, but I don't want anything to do with that guy anymore 08-Dec-19 01:12 PM oh? 08-Dec-19 01:16 PM former boss, turned out to be a complete maniac 08-Dec-19 01:16 PM ouch, that's a tough spot lol 08-Dec-19 01:16 PM at least he's not the current boss 08-Dec-19 01:18 PM yep 08-Dec-19 01:18 PM I got lots of great stuff from him while we were still on a good relationship, then a friend of mine did something the right, legal way instead of how our boss wanted it to be done and so we both got fired and insulting e-mails for 3 days 08-Dec-19 01:20 PM that seems like a lawsuit 08-Dec-19 01:21 PM honestly, after all the stuff I got from him I didn't want to risk anything 08-Dec-19 01:21 PM I'd rather keep all that stuff and ignore him from now on 08-Dec-19 01:22 PM fair enough 08-Dec-19 11:53 PM Or have him fired, get his position, hoard ALL the stuff 08-Dec-19 11:54 PM it's his company 09-Dec-19 12:06 AM moar challenging 09-Dec-19 12:06 AM xD 09-Dec-19 12:06 AM after all the stuff he's done and people he's pissed off... no thanks 09-Dec-19 12:06 AM plus most of his stuff is broken 09-Dec-19 12:06 AM don't get me wrong, lots of awesome gear and whatnot, but 90% is broken and about 50% is BER 09-Dec-19 06:31 AM Yay, I found a new ion source for the leak tester \o/ 09-Dec-19 06:31 AM waits impatiently 09-Dec-19 06:33 AM What's wrong with the current one? 09-Dec-19 06:34 AM pretty sure the filament is dead 09-Dec-19 06:34 AM Ohm it out? 09-Dec-19 06:35 AM I have no pinout for it :/ 09-Dec-19 06:35 AM Take it apart or look for a filament isolation transformer? 09-Dec-19 06:35 AM but the controller says 0 Emission current and no current through the heater 09-Dec-19 06:36 AM Oh yeah it dead 09-Dec-19 06:36 AM I'll take it apart once I'm back from work 09-Dec-19 06:36 AM and document the pinout 09-Dec-19 06:36 AM It's usually not that hard to just fab filaments for this sort of thing 09-Dec-19 06:36 AM oh, good to know 09-Dec-19 06:36 AM we'll see, I'll post pics for sure :) 09-Dec-19 06:38 AM Leak detectors are pretty commonly just a bent piece of wire 09-Dec-19 06:38 AM http://lampes-et-tubes.info/sp/sp088.php?l=e 09-Dec-19 06:38 AM Sometimes a bit of a spiral depending on architecture 09-Dec-19 06:38 AM looks like it's terrible to reach 09-Dec-19 06:39 AM Oof yeah 09-Dec-19 06:39 AM I don't like that one from a service standpoint 09-Dec-19 06:40 AM but! 09-Dec-19 06:40 AM plus side 09-Dec-19 06:40 AM it has two Filaments and rotating the connector switches between both 09-Dec-19 06:40 AM pretty cool imo 09-Dec-19 06:40 AM Yeah that's not unusual 09-Dec-19 06:40 AM A lot of rgas do that as well 09-Dec-19 06:41 AM oh, ok 09-Dec-19 06:41 AM cool! 09-Dec-19 06:41 AM Yeah it's nice until you burn the second one out... 09-Dec-19 06:41 AM And then you actually have to vent the system 09-Dec-19 06:42 AM luckily that's not too big of an issue with a leak tester 09-Dec-19 06:42 AM Which for a rga on uhv system... 09-Dec-19 06:42 AM Is not a good time 09-Dec-19 06:43 AM time for an isolation valve on every connection of the chamber 09-Dec-19 06:45 AM Lol yeah just but a bunch of full metal isolation valves or differentially pump o ring seals on literally everything and then and bypass valving for both roughing and highvac/bakeout 09-Dec-19 06:45 AM yep XD 09-Dec-19 06:45 AM No possible problem with this plan 09-Dec-19 06:45 AM At least filaments last a long time at uhv 09-Dec-19 06:47 AM how long is "a long time" here? 09-Dec-19 07:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screenshot_20191209-165426-283DF.png 09-Dec-19 07:58 AM ayyy, pinout! 09-Dec-19 07:58 AM now I can ohm it out 09-Dec-19 09:05 AM god damn it, both filaments are good 09-Dec-19 09:05 AM so the issue is in the controller 09-Dec-19 09:05 AM but hey, now I've got replacements :D 09-Dec-19 10:51 AM it works! 09-Dec-19 11:08 AM Yay, even makes the eeeeeeeeee noise! 09-Dec-19 11:18 AM eeeeEEEEEEEEEEEeeeeee 09-Dec-19 12:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191209_211049-16EF8.jpg 09-Dec-19 12:17 PM I am scared 09-Dec-19 12:24 PM It's starting to show growths 09-Dec-19 12:24 PM Be careful, it might envelop your entire house in KF pipes while you sleep 09-Dec-19 12:24 PM oh no 09-Dec-19 12:24 PM that would be 09-Dec-19 12:24 PM terrible 09-Dec-19 12:24 PM https://giphy.com/gifs/3d-retro-1980s-3oriNU0ZF7vAHESLq8 09-Dec-19 01:17 PM haHA! ONE Leak and that's at a vcr connector where I DIYed the gasket 09-Dec-19 01:48 PM We watch gigasquirrel as he slowly leak tests his entire house, descending into madness 09-Dec-19 01:57 PM heh, "slowly" 09-Dec-19 01:57 PM and I'm sure some amount of madness already has to be involved to get and repair a leak tester 09-Dec-19 03:05 PM What if the leak tester leaks? 09-Dec-19 03:26 PM @piGuy gotta get a leak tester hooked up to the leak tester 09-Dec-19 03:57 PM It pumps down! 09-Dec-19 03:57 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSCF00012-D5DB1.JPG 09-Dec-19 04:18 PM congrats! 09-Dec-19 04:34 PM Now for the precursor delivery piping, and control electronics for their heaters and valves, along with the vacuum gauge interface (mks 901p) 09-Dec-19 10:05 PM @piGuy you mean like this? https://youtu.be/tY_87BT8li4 09-Dec-19 10:17 PM It's an air raid siren for a species that survives on vacuum 09-Dec-19 10:20 PM Helium raid siren 10-Dec-19 05:41 AM An audible alert seems like an odd choice for a species living in a vacuum 10-Dec-19 05:41 AM (I bet the rack unit would outgas like hell too) 10-Dec-19 05:45 AM It's a good "ziplock your iphones now" alarm though 10-Dec-19 05:48 AM good thing I have a proper phone 10-Dec-19 05:48 AM Same here 10-Dec-19 05:48 AM Can't even function when someone spills a little helium across the building, pshh. That and the walled garden philosophy makes me think they don't want their users to have fun. 10-Dec-19 06:00 AM So… a leak tester is 70% vacuum pumps and 30% ion gun and detector carefully positioned to get hit by helium only? 10-Dec-19 06:00 AM (110% always) 10-Dec-19 06:01 AM Yep 10-Dec-19 06:01 AM Surprisingly simple? 10-Dec-19 06:01 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/sp088h-80F4A.gif 10-Dec-19 06:02 AM Do you make your own LN2 10-Dec-19 06:02 AM Not yet 10-Dec-19 06:02 AM used it without ln2 so far 10-Dec-19 06:02 AM Ah 10-Dec-19 06:02 AM University folks where hesitant to let me borrow a dewar 10-Dec-19 06:03 AM I have lots of dewars 10-Dec-19 06:03 AM but no way to get ln2 :< 10-Dec-19 06:03 AM below like 1000 liters 10-Dec-19 06:03 AM (More like: where hesitant to hand me hazardous materials) 10-Dec-19 06:04 AM ah, well, that's a different issue ^^ 10-Dec-19 06:05 AM (Though I would have needed to borrow the dewar as well) 10-Dec-19 06:07 AM the (my) main issue with ln2 is that most of my stuff needs a refill every day or two 10-Dec-19 06:07 AM Does the coldtrap improve the filament lifetime, or what purpose does it have here? 10-Dec-19 06:07 AM and of course I have a storage dewar, but that's only 18l 10-Dec-19 06:07 AM the cold trap prevents system contamination and thereby also extends filament life 10-Dec-19 06:10 AM Do you by chance know the internal volume of the coldtrap's tank? 10-Dec-19 06:10 AM guessing 3L 10-Dec-19 06:12 AM Pretty cool 10-Dec-19 06:12 AM yep 10-Dec-19 06:13 AM Thanks for the explanations! Gotta find me some disposable income soon… 10-Dec-19 06:18 AM xD 10-Dec-19 06:18 AM you'll be hard pressed to find a good one at a good price 10-Dec-19 06:18 AM they're not that common and as you can see, they can get very old 10-Dec-19 06:18 AM but if you do congrats! 10-Dec-19 06:18 AM they're really fun to play around with 10-Dec-19 06:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191210_154349-BC19C.jpg 10-Dec-19 06:44 AM Euroshop to the rescue 10-Dec-19 09:15 AM Hey. Valuable limited resource right there! Why do we waste it on stupid children’s balloons? Hydrogen is far more fun for that! Hahahaha. 10-Dec-19 09:45 AM good thing they forgot to put the actual balloons in there xD 10-Dec-19 09:45 AM but wow it is pink 11-Dec-19 06:19 PM Turbo drive version 1 is done! https://i.spirit.re/DpU5M.png 11-Dec-19 06:19 PM https://i.spirit.re/0PVkD.png 11-Dec-19 06:19 PM This version will drive 2, 4, and center-tapped 3-phase turbos 11-Dec-19 06:19 PM On the right there's a display, encoder, and button interface connector for a nice 160x128 LCD, as well as two means of measuring temperature. The internal thermistor should be... well, the internal thermistor, and the DS18B20 option is there if you either don't have the right thermistor or have a water-cooled turbo and want to drop one into the water tank. 11-Dec-19 06:19 PM Diode clamped inputs, including three for hall sensors, with analog/weird sensor support(to be added in the future) 11-Dec-19 06:19 PM Bus voltage and current monitoring is there too, and I'll probably integrate a constant-current startup mode 11-Dec-19 06:29 PM i think you might need to increase the size so you can adequately heat sink the fets 11-Dec-19 06:29 PM but that is just my concern based on glancing at it 11-Dec-19 06:30 PM I placed the fets on the outside specifically for this 11-Dec-19 06:30 PM They're IRF530N, so they should operate pretty cold, but for the hard startup current(3-5A vs 50-100mA run) I'll place them on a heatsink 11-Dec-19 06:30 PM Though I think with these fet drivers and at the driving frequency(I'm thinking around 18kHz because I like my ears), they should stay relatively cold while the turbo current drops 11-Dec-19 06:30 PM Here's the schematic in case anyone is curious 11-Dec-19 06:30 PM https://i.spirit.re/L0chP.png 11-Dec-19 07:01 PM Looks like in total this controller costs around $70 each in parts, in single quantities, including the display($4) and whatever cheap encoder($1)/buttons(2x $1) you can find. 11-Dec-19 07:01 PM Not too bad. 11-Dec-19 07:24 PM You'll need your own housing, heatsink, and appropriate power supply(18-75VDC) 11-Dec-19 11:26 PM Is the input voltage dependent on the turbo's input requirement? 11-Dec-19 11:28 PM It has a current sensor so it really shouldn't matter 11-Dec-19 11:28 PM But I recommend running the native turbo voltage regardless 12-Dec-19 12:19 AM Cool! 12-Dec-19 12:19 AM Let me know when it's ready to order a PCB! 12-Dec-19 12:19 AM I'd love to try it on the ebay turbo I got a month or two ago 12-Dec-19 12:19 AM Purchased new oil for it already 12-Dec-19 12:19 AM Any reflow only components? 12-Dec-19 12:21 AM Yes 12-Dec-19 12:21 AM I can hand solder SSOP no problem 12-Dec-19 12:21 AM Oh 12-Dec-19 12:21 AM Well, sort of 12-Dec-19 12:21 AM Wah wuh 12-Dec-19 12:21 AM There's a very weird QFN 12-Dec-19 12:21 AM https://i.spirit.re/nyBb0.png 12-Dec-19 12:22 AM Those are basically leadless SSOP I think 12-Dec-19 12:22 AM Lol 12-Dec-19 12:22 AM and a QFP100 for the main package 12-Dec-19 12:22 AM but that's doable by hand 12-Dec-19 12:22 AM May be able to get it done by hand 12-Dec-19 12:22 AM Oh yeah qfp ive done too 12-Dec-19 12:22 AM Not a problem 12-Dec-19 12:22 AM 2 or 4 layer? 12-Dec-19 12:23 AM 2 layer, with a LOT of vias 12-Dec-19 12:23 AM (229) 12-Dec-19 12:23 AM Looks like maybe 4 square inches 12-Dec-19 12:23 AM 86.1x62.23mm 12-Dec-19 12:23 AM It's already going through manufacturing at Aisler, I should get the board in maybe 3-4 weeks at worst 12-Dec-19 12:24 AM Oh wow 8.3 sq in 12-Dec-19 12:24 AM Yeah, it's chunky 12-Dec-19 12:25 AM I can usually get a 2 layer for $5/sq inch within 2 weeks, for 2 copies of the board 12-Dec-19 12:25 AM I'll have two spare boards if v1 works, since the min order quantity is 3 bare boards 12-Dec-19 12:25 AM But I won't have any spare parts kits 12-Dec-19 12:25 AM But I'll have a BOM of course 12-Dec-19 12:26 AM If you're open to sharing the board files and BOM, I'm in to order parts and a few boards 12-Dec-19 12:26 AM I'm just not sure whether it'll work at all 12-Dec-19 12:26 AM Soldering is fun enough 12-Dec-19 12:26 AM Hehehe yeah let me know, then I'll order 12-Dec-19 12:26 AM I'll probably opensource it as well 12-Dec-19 12:26 AM just in case someone wants to build their own 12-Dec-19 12:26 AM I recommend grabbing a bunch of these https://www.ebay.com/itm/3-3V-1-8-SPI-TFT-LCD-Shield-Breakout-Board-Module-for-Arduino-Nano-Pro-Mini-TW/153411077456 12-Dec-19 12:26 AM All my upcoming vacuum-related projects will be using these 12-Dec-19 12:27 AM I'm sure i could get micropython running on that stm 12-Dec-19 12:27 AM You wouldn't want to 12-Dec-19 12:27 AM "Only" 512k of flash 12-Dec-19 12:28 AM I think thats plenty from my recollection 12-Dec-19 12:28 AM just not much for actual code 12-Dec-19 12:29 AM I've got it running on an stm32f401 12-Dec-19 12:29 AM Which has 512 Kbytes of Flash, 96 Kbytes of SRAM 12-Dec-19 12:29 AM Well, the firmware will be opensource 12-Dec-19 12:29 AM If you're up for a bit of masochism I won't stop you 12-Dec-19 12:30 AM Not sure a turbo controller needs python 12-Dec-19 12:30 AM ;) 12-Dec-19 12:30 AM yeah lol 12-Dec-19 12:30 AM Good luck with the upcoming testing! 12-Dec-19 12:31 AM I shared the schematic a bit above 12-Dec-19 12:31 AM I think I've incorporated pretty much everything I could on this board while keeping it cheap 12-Dec-19 12:34 AM I opened it but the resolution was too low for me to read, or discord wouldn't let me zoom in enough 12-Dec-19 12:34 AM It looks clear taking a second look, but will need to open on my not-phone 12-Dec-19 12:42 AM Plotted a vector PDF: 12-Dec-19 12:42 AM https://i.spirit.re/8LFEH.pdf 12-Dec-19 12:49 AM Ooh yeah that's easily read 12-Dec-19 12:49 AM Will check it out tomorrow 12-Dec-19 12:49 AM Gotta sleep now! 16-Dec-19 12:09 AM Very nice turbo drive! 16-Dec-19 12:21 AM Thanks! 17-Dec-19 12:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20191217_120040-0050E.jpg 17-Dec-19 12:00 PM Got the first fuel injector for chamber injection testing 17-Dec-19 12:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20191217_120231-96A5D.jpg 17-Dec-19 12:00 PM About half the size i imagined 17-Dec-19 02:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/s-l1600-F3FB3.png 17-Dec-19 02:11 PM Gonna go pick this up this Thursday, will be my first piece of kit as far as vacuum goes 17-Dec-19 02:11 PM Don't recognize this emitter (assuming) setup, probably most because I'm noob - any insight from anyone? 17-Dec-19 02:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/s-l500-33397.png 17-Dec-19 02:11 PM has that hint of lanthanum color in the middle but the plate configuration is throwing me off 17-Dec-19 02:18 PM Ah, that was posted here a month or so ago. Are you in Texas? 17-Dec-19 02:18 PM Nice deal, $500 right? 17-Dec-19 02:37 PM Yea $500 was the only bidder, I'm in northwest florida, so will be a bit of a road trip to get it 17-Dec-19 02:37 PM https://www.houstonchronicle.com/news/houston-texas/houston/article/2-UH-professors-accused-of-fraud-say-they-re-5449364.php 17-Dec-19 02:37 PM yea I looked him up. Honestly if that's the worse thing he does in life he's a better character than most. 17-Dec-19 02:37 PM Yeah 17-Dec-19 02:37 PM with his ebay username being all human-like I got curious 17-Dec-19 02:37 PM and then the sticker "property of whatever that company name was" 17-Dec-19 02:39 PM https://sbir.nasa.gov/SBIR/abstracts/11/sbir/phase1/SBIR-11-1-S1.04-8396.html 17-Dec-19 02:39 PM The chamber might be used for these devices 17-Dec-19 02:41 PM It would stand to reason. I asked if he had any info on the emitter/detector setup and about all he would volunteer was that he had no documentation and that it was custom 17-Dec-19 02:41 PM I landed on the auction just for the chamber but then realized he's included all the other stuff 17-Dec-19 02:42 PM Does the massive turbopump come with a controller? 17-Dec-19 02:42 PM no, no controller 17-Dec-19 02:43 PM Still, super nice chamber. Lots of feedthroughs and viewports, valves and pumps, congrats. 17-Dec-19 02:43 PM Do you have an application in mind? 17-Dec-19 02:45 PM thin films was the goal, but haven't decided exactly what I'll use this particular rig for 17-Dec-19 02:45 PM still doing the research on what all I can try and combine into a given space without ruining the other applications 17-Dec-19 02:45 PM milling would be nice for sure 17-Dec-19 02:45 PM my primary interest/hobby is photonics, primarily ultrafast/ultrashort pulse fiber lasers.. became enamored a few years back with that two-photon polymerization video where they made the little spaceship 17-Dec-19 02:49 PM You want to mill diffraction optics with ions? 17-Dec-19 02:50 PM yes that would be nice 17-Dec-19 02:50 PM the idea of /real/ gradient index custom optics excites me to no end 17-Dec-19 02:50 PM Would be some challenge. Building your own FIB is more than just having a chamber that can house it 17-Dec-19 02:51 PM yea I've got lots of edu still to go but have managed to boostrap my way to some very capable tools which can make things easier than average 17-Dec-19 02:51 PM What will you use as an ion source? 17-Dec-19 02:51 PM I assume you'll be using argon or some sort of liquid metal? 17-Dec-19 02:52 PM no idea, I'm still surveying options as far as epitaxy goes and the likes 17-Dec-19 02:52 PM my initial "oh snap I could totally.." got me on to photonic crystal related stuff 17-Dec-19 02:53 PM An ionization chamber has too large a virtual source size, so feature size and current density will be limited. The next step is pretty much liquid metal ion sources 17-Dec-19 02:54 PM yea I think I had read gallium is often used? or I may be mixing some other processes up 17-Dec-19 02:54 PM Yep 17-Dec-19 02:54 PM downside being embedding gallium into the sample though I think too 17-Dec-19 02:54 PM Ask @nmz787 , he's got a FIB at home 17-Dec-19 02:55 PM yea he and I chatted I think from reps' discord or similar.. I believe he recommended this server and it was a helpful suggestion for sure 17-Dec-19 02:55 PM nope I was mistaken, checked chat history and it was @GigaSquirrel who got me in here 17-Dec-19 02:55 PM at any rate, yea ion milling would be nice. my initial focus has been functional thin films and then I started veering towards mbe but I still lack the chemistry knowledge to intuit what I can and can't achieve with a given technique 17-Dec-19 03:02 PM MBE would be quite a bit harder than your normal thin film deposition process like PVD. All those process control parameters 17-Dec-19 03:03 PM yea my dream/delusion with mbe is experimenting with sub-wavelength periodic waveguide features, so the idea of being able to control the spatial aspect is a big part of the draw 17-Dec-19 03:04 PM What material do you want to deposit/grow? 17-Dec-19 03:04 PM I will surely dial-it-back and get my feet wet with something much simpler hehe 17-Dec-19 03:04 PM so that's the thing, and where I lack at the moment in knowledge, most of the stuff I want to deal with falls under the lanthanides which I got the impression is a bit incompatible with some processes due to their number 17-Dec-19 03:06 PM Yeah, maybe start with regular magnetron sputtering, then PVD, then move on from there. 17-Dec-19 03:07 PM yea, really just a powerful electron beam for milling and and evaporation and whatnot would get me years of sidetracked projects 17-Dec-19 03:08 PM Milling with an e-beam? 17-Dec-19 03:09 PM maybe more etching than milling? not sure 17-Dec-19 03:09 PM Etching would be much much easier with an e-beam, lots of known resists that works well 17-Dec-19 03:09 PM I was under the impression you could more or less ablate with a beefy gun 17-Dec-19 03:10 PM E-beam milling will be another heck of a challenge, so much energy density needed 17-Dec-19 03:10 PM Yeah, and you'd need to pulse it 17-Dec-19 03:10 PM Just picked up some 100 mm wafers with PMMA spun on them, about 180 nanometers thick, was thinking I would try a diffractive optic, except since it's on silicon it wouldn't be transparent so maybe I'll try just some other really tiny stuff 17-Dec-19 03:10 PM I'm not sure if it diffractive optic would work for a reflective mode 17-Dec-19 03:11 PM maybe someone has done a paper on using an ultrashort intense pulse to get some electrons, heh 17-Dec-19 03:11 PM Well e-beam is commonly used for photoresist exposure so 17-Dec-19 03:11 PM ZEP is a chemically amplified resist, PMMA is etched by chain scission 17-Dec-19 03:13 PM Etching takes long enough lol, milling will take forever if you don't have a super beefy gun. Large current density probably means your feature size will be limited too 17-Dec-19 03:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20191217_151303-A383A.jpg 17-Dec-19 03:13 PM For developer I'll just use 70% ethanol 17-Dec-19 03:13 PM ampdf.pdf 17-Dec-19 03:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/ampdf-620BA.pdf 17-Dec-19 03:13 PM That's where i got the ethanol development reference from 17-Dec-19 03:13 PM "Ethanol is much less hazardous than both MIBK and IPA, as it has been historically consumed by cultures all around the world as part of alcoholic beverages" 17-Dec-19 03:16 PM Where did you get your wafers from? Expensive? 17-Dec-19 03:16 PM Use vodka lol 17-Dec-19 03:16 PM lol 17-Dec-19 03:16 PM I like that author 17-Dec-19 03:17 PM The box says Virginia Semiconductor... But I'm not sure, I don't think that's who spun coat them 17-Dec-19 03:17 PM Whoever spun coat them overcharged tho, as they have comet tails in them 17-Dec-19 03:17 PM And I've been able to get really nice layers of resist myself with the spincoater 17-Dec-19 03:17 PM No comet tails 17-Dec-19 03:17 PM I didn't pay for these, my part time job did 17-Dec-19 03:18 PM Okay, let us know how e-beam lithography with PMMA resists turn out 17-Dec-19 03:18 PM I was trying to do some lithography with pmma about a year ago, but wasn't getting good enough resolution and assumed paying for ebeam writer to do it would be faster and more efficient 17-Dec-19 03:18 PM This was and is with FIB 17-Dec-19 03:18 PM I don't have a working e-beam at my part time or home 17-Dec-19 03:19 PM Oh, don't you have a dual beam system? 17-Dec-19 03:19 PM pmma is known to be quite high resolution 17-Dec-19 03:19 PM Or did you just want a dual beam system? 17-Dec-19 03:19 PM No 17-Dec-19 03:19 PM I want 17-Dec-19 03:19 PM I know someone nearby with one 17-Dec-19 03:19 PM But I've been shy to go use 17-Dec-19 03:19 PM They did say i could get some time on theirs tho 17-Dec-19 03:19 PM @Metanoic if you've got any BMP files you'd like etched into photoresist... Send it/them my way 17-Dec-19 03:19 PM 100mm diameter is pretty huge 17-Dec-19 03:19 PM I've got an nickel electroplating system at my part-time, but it hasn't been used in like a decade so probably needs some maintenance or something 17-Dec-19 03:19 PM But idea should be to etch features in photoresist, sputter (or electroless deposit) metal, then electroplate a thick backing, then peel off and dissolve remnant photoresist 17-Dec-19 03:45 PM oooo 17-Dec-19 03:45 PM bmp 2 color? greyscale? 17-Dec-19 03:45 PM not sure how this would turn out, but worth a shot 17-Dec-19 03:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/2019-12-17-A0F50.png 17-Dec-19 03:45 PM @nmz787 my buddy's kiddo 17-Dec-19 03:49 PM I've only done single bit depth BMP so far, I can try greyscale though. 17-Dec-19 03:50 PM Try a grayscale grid first 17-Dec-19 03:50 PM To linearize the real input before you etch it 17-Dec-19 03:52 PM Good idea 17-Dec-19 04:01 PM Wider field of view during imaging definitely has some distortion, but zoomed in doesn't 17-Dec-19 04:01 PM Wider field meaning like 600-1000 microns wide 18-Dec-19 01:12 AM Remember cheap current supply of silicon wafers and dies 18-Dec-19 01:12 AM https://www.alphananotechne.com/silicon-wafers 18-Dec-19 01:12 AM @Mason_Yu 18-Dec-19 12:09 PM Hmm, they seem to sell lower quantities, but more expensive per piece than universitywafer.com 18-Dec-19 01:13 PM huh never heard of them before or seen them before! 18-Dec-19 01:15 PM I found them some time ago looking for something else in amazon. 18-Dec-19 01:15 PM I will probably buy the squares from them to make my chips 18-Dec-19 01:18 PM Not alpha... universitywafer 18-Dec-19 01:20 PM Ah, sorry. 18-Dec-19 01:32 PM Lol i found them when i was.... In University 18-Dec-19 02:18 PM Hmm I get single wafers on university wafers pretty often 18-Dec-19 02:18 PM Usually 1-4 4” wafers 18-Dec-19 02:18 PM Decent price on ssp prime grade 18-Dec-19 02:18 PM Last batch was $20 each or right bout there 18-Dec-19 02:58 PM Oh nice, i usually just skim their emails they send me, haven't really looked into buying wafers in years 18-Dec-19 03:07 PM Leaving for Houston 2AM tomorrow morning to go pick up that chamber from UofH, plan on swinging by dude's place afterwards to shop the rest of his equipment. 18-Dec-19 03:07 PM Pretty excited 18-Dec-19 03:17 PM Pic of chamber? 18-Dec-19 03:18 PM Scroll up 18-Dec-19 03:28 PM https://www.ebay.com/itm/10-OD-UH-Vacuum-Chamber-for-field-emission-measures/333415893176 18-Dec-19 03:35 PM Nice! 18-Dec-19 03:35 PM Sweet looking deal 18-Dec-19 03:58 PM ooh nice, you grabbed that one :D 18-Dec-19 04:06 PM Yea, was in the market just for piecing together a system then saw that on Ebay and was like "eh, I'll throw a bid for 500" then won and was like "damn, now I gotta go to Houston" 18-Dec-19 04:06 PM Managed to convince a family member to come help retrieve it. Will be a nice self-gift for xmas. 18-Dec-19 07:47 PM You got a pallet jack, or the university have one you can use? 18-Dec-19 07:47 PM Getting a lift gate truck, or using a pickup truck? 18-Dec-19 08:04 PM Yeah btw if you have any questions one righting the thing for transport feel free to tag me 18-Dec-19 10:29 PM They've got a loading dock with ramp that I'll be backing up to with an F150. Got various fixin's for stabilizing and tying down. I often haul dirtbikes and have moved various heavy machinery on trailer and whatnot and am confident I'll be able to manage the rigging. 18-Dec-19 10:29 PM I've also got another able body coming with me to help, and the guy says if worse comes to worst that we can enlist a few students to help with the loading, haha. 18-Dec-19 10:29 PM As for transport within the building and out, I'm planning on just lifting with able body help and placing a few furniture dollies underneath and lashing them together top/bottom using hanger strap or some lumber that I'm bringing with 18-Dec-19 10:29 PM packing some u-bolts and the like as well 18-Dec-19 10:34 PM Chamber and turbo too! 18-Dec-19 10:34 PM yea no controller, but honestly I'm thrilled with what I'm getting considering the price 18-Dec-19 10:34 PM trying to convey the deal it was to people I was asking to help me move it was difficult though lol 18-Dec-19 10:34 PM like.. you don't understand.. I'm not going to get this locally, we HAVE to drive a half day each way for this 18-Dec-19 10:36 PM Going to the previous discussion above, making a single system that does both EBL and electron beam evaporation seems not realistic. Evaporation is a lot of beam - like 100 mA depending on the crucible and conditions and material. 18-Dec-19 10:36 PM the only thing I'm a little worried about is just wind buffeting around the thing and jostling the emitter assembly 18-Dec-19 10:36 PM I would drive a day each way 18-Dec-19 10:37 PM eh I'll go a day without a vyvanse at the end of my month if you know what I mean 18-Dec-19 10:37 PM 500 bucks!! What 18-Dec-19 10:37 PM yea!! 18-Dec-19 10:38 PM That’s an epic score 18-Dec-19 10:39 PM yea I think I did well.. after posting it the other day people mentioned how ya'll had talked about it in here a month or so back and I looked at his completed listing on eBay and it was up like 2 times earlier.. can't believe nobody else had snagged it 18-Dec-19 10:40 PM I think our e-beam evap is a 10kW driver - 10 kV 1A. That scares me a little bit when ever the electronics cabinet is open. In Soviet evaporator it thin film deposits you. 18-Dec-19 10:40 PM Post pics of what you get when you pick it up 18-Dec-19 10:40 PM definitely 18-Dec-19 10:40 PM gonna get back to packing, I will keep ya'll updated 18-Dec-19 10:41 PM leaving in like 45 minutes! 19-Dec-19 03:46 PM So far so good. Loaded up fine, then went to his place for another haul of stuff equally priced. Cold cathode gauge, electron gun, molybdenum wafer/sample holder, bunch of optics posts and filters, few other things. 19-Dec-19 03:46 PM Will be posting a few pics of his shelves of goodies if anyone wants to shop. 19-Dec-19 05:02 PM Nice, good luck on the return trip 20-Dec-19 12:37 AM Home! Successful trip. Saving the unloading for tomorrow. 20-Dec-19 12:40 AM Definitely share some pics of that chamber and the other stuff you got too 20-Dec-19 01:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image-20191220_030334-BC206.jpg 20-Dec-19 01:07 AM Molybdenum wafer holder 20-Dec-19 01:18 AM Will share the rest over the weekend. Bed time for now. 20-Dec-19 01:33 AM what a pretty sight 20-Dec-19 01:33 AM XD 20-Dec-19 01:33 AM is it two concentric clamping rings? 20-Dec-19 01:34 AM It's two pieces, yea. It basically twists in and locks with spring wires 20-Dec-19 01:34 AM I will post more detailed pics of it along with the other stuff 20-Dec-19 05:47 AM Nice stuff. I am sure you could resell bits you don't need to people here and get some of your money back if you so desire :) 20-Dec-19 12:15 PM Didn't really snag anything that I don't plan on using, figured others could pick his stuff up off ebay when he lists them 20-Dec-19 12:15 PM I'm posting pictures now to #swap-meet of his shelves if anyone spots something they want I can get you in contact with him - think pennies/dimes on the dollar sort of pricing. 20-Dec-19 05:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191220_170418-476F0.jpg 20-Dec-19 05:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/MVIMG_20191220_170432-CCA00.jpg 20-Dec-19 05:06 PM Got this bad boy for free today! 20-Dec-19 05:06 PM It weighs probably 80 lb 20-Dec-19 05:06 PM Not water cooled which is what I was hoping for in a RF supply 20-Dec-19 05:09 PM eugh 208... 20-Dec-19 05:09 PM also why do you hope for water cooled? 20-Dec-19 05:09 PM shouldn't need water cooling unless your getting to like 2kW and above tbh... 20-Dec-19 05:09 PM and really it depends on efficiency too 20-Dec-19 05:19 PM Meant i didnt want water cooled 20-Dec-19 05:19 PM Just gotta get a buck transformer to connect my 240 up 20-Dec-19 05:22 PM I suppose at-least its single phase... 20-Dec-19 05:22 PM most RF gens quickly become 3 phase 20-Dec-19 05:22 PM or some I have seen 48V... 20-Dec-19 05:22 PM which then have a box 3 times the size of the RF gen that makes the 48V for it... from 3 Phase... 20-Dec-19 05:22 PM like what the heck 20-Dec-19 05:23 PM Lol 20-Dec-19 05:23 PM Get your rf supply yet from gigasquirrel? 20-Dec-19 05:23 PM nope... I haven't checked the tracking in a few days but it wasn't even in the states last I checked 20-Dec-19 05:24 PM As long as it shows up not smashed 20-Dec-19 05:24 PM Yea germany handed it off to whatever boat I guess and USPS is waiting... 20-Dec-19 05:24 PM So limbo so far 21-Dec-19 01:22 AM Nice 13.56 MHz 1kW 21-Dec-19 01:22 AM DRIE time! 21-Dec-19 01:22 AM Or at least powerful O2 plasma ashing if you can’t get a SF6 cylinder 21-Dec-19 01:22 AM The two saddest diffusion pumps I’ve ever seen 21-Dec-19 01:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-22BE0.jpg 21-Dec-19 01:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-07096.jpg 21-Dec-19 01:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-06F6E.jpg 21-Dec-19 01:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image3-FD878.jpg 21-Dec-19 01:22 AM So filthy and old but hey they are diffs, clean them out and change the oil and they’ll work 21-Dec-19 01:27 AM ouch 21-Dec-19 01:27 AM just pressure wash them, fill them with new oil and they will run like new :D 21-Dec-19 11:53 AM Recently I only dreamed about it, and now I have 2 of these puppies Both works smoothly 21-Dec-19 11:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-0B965.png 21-Dec-19 12:15 PM I'll trade you a smaller one for a bigger one :^) 21-Dec-19 12:34 PM nice! 21-Dec-19 02:08 PM I need to change my turbo for a smaller one, right now it's massive. 21-Dec-19 02:30 PM I've got a 56l/s one 21-Dec-19 02:40 PM I've got a 40l/s one 21-Dec-19 02:40 PM It's very cute 21-Dec-19 02:40 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/TPH_040-B2DAE.jpg 21-Dec-19 03:16 PM it's the predecessor to mine 21-Dec-19 03:16 PM similar blade profile 21-Dec-19 03:16 PM my driver should drive it 22-Dec-19 12:05 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191222_090351-1008F.jpg 22-Dec-19 12:05 AM my hand is a bit back, but this turbo is huge. 22-Dec-19 01:41 AM Idk if I'd call that huge 22-Dec-19 01:41 AM Looks pretty normal size 22-Dec-19 01:41 AM Saw a 4700l/s turbo a few nights ago, now that seemed huge 22-Dec-19 01:41 AM Or l/min, can't remember the unit 22-Dec-19 01:41 AM Must be per minute 22-Dec-19 01:41 AM Right? 22-Dec-19 02:54 AM biggest turbo ive seen was about the size of a 5gal bucket, couldn't imagine running such a monster 22-Dec-19 02:54 AM thats an interesting shape on that turbo though 22-Dec-19 07:45 AM yea I helped @Mason_Yu move his turbo and that thing had like a 12" opening on the end of it... and it was about as tall as a 5 gallon bucket... 22-Dec-19 07:45 AM Well maybe not that tall but it was big haha 22-Dec-19 10:14 AM It's slightly taller and slightly wider than a 5 gal bucket 22-Dec-19 10:14 AM https://media.discordapp.net/attachments/657679267169304586/658023378321539072/unknown.png?width=515&height=684 22-Dec-19 10:14 AM ISO250 flange, 1550 l/s pumping speed, magnetic bearing 22-Dec-19 10:16 AM A lot more scary than a 5 gal bucket however 22-Dec-19 10:16 AM Yep 22-Dec-19 10:16 AM heh 22-Dec-19 08:27 PM Got pics of all the components on that chamber I retrieved the other day. Will make an imgur album here in a bit so I dont spam the channel with images 22-Dec-19 08:27 PM As far as components go... various feed-throughs, halogen lamp heater, ti sublimation pump, electron gun, 3-axis motion feedthrough, Balzers TPH-1500 turbo pump, pneumatically actuated gate, motorized valve, manual valve, water sleeve pipe/chamber area where the ti pump was mounted, few other things I'm surely forgetting. 22-Dec-19 08:33 PM ti sublimation* 22-Dec-19 08:33 PM Chamber itself is coated in a gray-bluish powder which I'm going to treat as though it's arsenic just to be safe. 22-Dec-19 08:33 PM Yea sry, you're right 22-Dec-19 08:33 PM gray-bluish powder might be a non-evaporable getter, NEG 22-Dec-19 08:33 PM https://www.saesgetters.com/products-functions/products/getters/non-evaporable-getters 22-Dec-19 08:33 PM Developed at CERN I believe, for the proton beam 22-Dec-19 08:34 PM I will try to get some color accurate pictures with my dslr then for y'alls better judgement 23-Dec-19 11:27 AM Visited the friend's shop today, learned to TIG weld 23-Dec-19 11:27 AM He's got some interesting toys 23-Dec-19 11:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191223_115354-8FB80.jpg 23-Dec-19 11:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191223_115429-C0E81.jpg 23-Dec-19 11:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191223_115659-4834D.jpg 23-Dec-19 11:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191223_115748-60906.jpg 23-Dec-19 11:27 AM These are the most interesting toys 23-Dec-19 11:27 AM WEDM(duh), a gear cutter, and an all-hydraulic precision grinding system 23-Dec-19 11:27 AM All nice and soviet, very old, but still works like a treat 23-Dec-19 11:27 AM Also, more laser gore! 23-Dec-19 11:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191223_122458-C6B2D.jpg 23-Dec-19 11:27 AM (this one was leaky) 23-Dec-19 11:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191223_123829-F0636.jpg 23-Dec-19 11:27 AM A little bit more laser gore 23-Dec-19 11:27 AM Toasty. 23-Dec-19 11:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191223_140530-731E8.jpg 23-Dec-19 11:27 AM But my first welds turned out great 23-Dec-19 11:27 AM Turns out TIG isn't all that complicated 23-Dec-19 11:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191223_140550-EDC8A.jpg 23-Dec-19 11:27 AM He helped me with the inner ones a bit and welded the fitting stubs in 23-Dec-19 11:27 AM But knowing that it was my first try - he just handed me the torch and said "alright, you can try", then walked away - I'd say it's great 23-Dec-19 11:50 AM not bad, looks like things were set a bit high for the thickness or you let it soak a bit too much but looks alright for your first try 23-Dec-19 11:53 AM The tube is way thicker than the sides so I had some blowout on the sides 23-Dec-19 12:05 PM blowout or excessive fusion? 23-Dec-19 12:17 PM A bit of both 23-Dec-19 12:17 PM This was DC, 53A 23-Dec-19 03:33 PM https://youtu.be/MLySuIOtV1E 23-Dec-19 03:33 PM Put together all the clips I snapped while doing it 23-Dec-19 04:58 PM please be careful wearing gloves around a lathe 23-Dec-19 04:58 PM especially one that size 23-Dec-19 04:58 PM this might be a bit much detail but your bones will break long before the chuck stops if anything gets caught up in it. 23-Dec-19 05:15 PM All of the people in the video is my friend 23-Dec-19 05:15 PM But he and I both know, no serious machining was done with PPE on 23-Dec-19 05:51 PM just wanted to mention it with how dangerous lathes can be when gloves/long sleeves/long hair/jewelry are involved. lot of people are pretty complacent about it but it takes less than a second for things to go wrong. glad everything was fine this time around 23-Dec-19 05:54 PM They're welding gloves 23-Dec-19 05:54 PM It's quite obvious that it's a silly idea to actually do machining in them 23-Dec-19 06:38 PM didn’t realize you have a channel @Deleted User lots of cool stuff there 23-Dec-19 06:39 PM thanks 23-Dec-19 06:39 PM more to come! 23-Dec-19 06:39 PM ... some day... eventually 24-Dec-19 01:46 AM the gloves are just to make the already missing fingers less obvious 25-Dec-19 12:50 AM Perfect family gifts 25-Dec-19 12:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-E05AA.jpg 25-Dec-19 01:17 AM Some sort of bushings? 25-Dec-19 01:37 AM Looks like those tri clamp thingies 25-Dec-19 01:39 AM nah those are kf clamps for mounting kf onto flat stuff 25-Dec-19 01:39 AM damn it I can't find any pictures of them in use 25-Dec-19 02:07 AM Yea that stuff 25-Dec-19 02:07 AM I think its ISO-K 25-Dec-19 02:07 AM Close enough 25-Dec-19 02:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/iso-k-flange-assy-250x250-E362B.jpg 25-Dec-19 02:12 AM nah that's kf, ISO-K has another lip 25-Dec-19 02:12 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/6014-1C8A6.png 25-Dec-19 03:25 AM Too many standards. We should come up with a better way and make that standard so we can have fewer standards. 25-Dec-19 09:40 AM Or some sort of cheat sheet that you can take to junk yards/stores 25-Dec-19 09:40 AM Like they have for screw/bolt sizes 25-Dec-19 11:24 AM https://www.ebay.com/itm/VACUUM-CHAMBER-230544/392591642532 25-Dec-19 11:24 AM @GigaSquirrel I got myself this for christmas :) 25-Dec-19 11:25 AM ohhhh! 25-Dec-19 11:25 AM congrats! 25-Dec-19 11:25 AM that looks very good for ICP stuff 25-Dec-19 11:27 AM hehe yea I just saw it for the price and with how much other conflat bits and pieces I have it'll be nice to have something to stick it all to 25-Dec-19 11:28 AM $95 chamber and $950 in flanges and parts :D 25-Dec-19 11:29 AM please tell me you can directly stick this over one of your cold heads 25-Dec-19 11:30 AM unfortunately my largest cold head at the moment is 6" conflat 25-Dec-19 11:30 AM it seems to have a 6" and 8" off the sides 25-Dec-19 11:30 AM then the two 10" off the ends 25-Dec-19 11:30 AM I think I have one or two 10" elbows 25-Dec-19 11:30 AM so if I can find a 10" cryo head I could have that off an elbow off the end hehe 25-Dec-19 11:30 AM Though I'll need 3 phase... 25-Dec-19 11:30 AM my two big cryo compressors are 3 phase :( 25-Dec-19 11:30 AM my small single phase one I dunno how big of a head I could realistically drive 25-Dec-19 11:30 AM Right now it has like a... 20W? 40K head on it I think it was 25-Dec-19 11:32 AM oh I can take that burden off your shoulders XD 25-Dec-19 11:32 AM no but seriously this is some really nice stuff, one might even get a bit jealous 25-Dec-19 11:35 AM hehe, sorry I have a feeling the 200 dollar shipping would have been a bit more to germany haha 25-Dec-19 11:35 AM I have been posting the other decent deals I found though, if it werent for this I'd probably have gotten one of those 4.5" 6 ways omg 25-Dec-19 11:35 AM those are so nice looking 25-Dec-19 11:35 AM 4.5" is a nice size for a small chamber too 25-Dec-19 11:38 AM dunno, I would not like to do anything below CF / ISO 100 (6" I think?) 25-Dec-19 11:38 AM for the longest time the biggest flange on my stuff was KF40 25-Dec-19 11:38 AM and now I would not like to miss being able to stick my whole arm in the chamber 25-Dec-19 11:40 AM yea thats fair, I was trying to keep above 6" too 25-Dec-19 11:40 AM but for a fusor I'd rather have 4.5" than 2.75" 25-Dec-19 11:40 AM and the price is about the same it seems :) 25-Dec-19 11:40 AM But yea I have one 6" T that I thought I was going to build my main chamber out of hah 25-Dec-19 11:40 AM I may use that for like some small simple process 25-Dec-19 11:40 AM but this big chamber will be fun for experimentation 25-Dec-19 11:41 AM oh yes 25-Dec-19 11:41 AM speaking of fusor 25-Dec-19 11:41 AM I might get some bottles of D2 early next year... 25-Dec-19 11:41 AM that's the only thing missing so far 25-Dec-19 11:41 AM but I've gotten a bit cautious, this is the third time someone promised me to get some 25-Dec-19 11:51 AM oof, I hope you do though! 25-Dec-19 11:51 AM If I ever found some or had the chance at some that would be my wakeup call to build a fusor lol 25-Dec-19 11:51 AM until then I think I'll hold off :) 25-Dec-19 11:52 AM I mean you could always just use D2O 25-Dec-19 11:52 AM but I'm aiming for a simple operation 25-Dec-19 11:52 AM and wet chemistry, drying and storing the gas etc is just very annoying 25-Dec-19 11:53 AM yeaaa basically that's my thought 25-Dec-19 11:53 AM like... If it was going to be a project it would be a tiny side project and doing all that would make it a big side project haha 25-Dec-19 11:54 AM even thinking about some analog feedback for pressure, voltage and current for a self tuning device 25-Dec-19 11:54 AM oh that would be nice 25-Dec-19 11:54 AM pump it down, flip a switch and be irradiated 25-Dec-19 11:54 AM I mean the nice thing with a small chamber pressure readings should be quite accurate, don't need like sensors all over haha 25-Dec-19 11:55 AM but sensors everywhere are what makes it look good XD 25-Dec-19 11:55 AM imagine a fusor in that chamber I just got :P 25-Dec-19 11:55 AM irradiate the neighborhood 25-Dec-19 11:55 AM why just one? Every feedthrough one grid! 25-Dec-19 11:55 AM lol 25-Dec-19 11:55 AM just need like 4 round elbows, make a circular thing like the big boys are doing :P 25-Dec-19 11:55 AM surely its that simple haha 25-Dec-19 11:57 AM some windings of magnet wire around it 25-Dec-19 11:57 AM connect a double A to it and boom, breakeven 25-Dec-19 11:58 AM nah, 18650, you can then charge it too 26-Dec-19 06:38 AM Splish splash, chamber's getting a bath 26-Dec-19 06:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20191226_083743-2A1F0.jpg 26-Dec-19 07:04 AM what a nice way to spend an evening 26-Dec-19 07:09 AM Oi, the bottom section looks really nice. 26-Dec-19 08:08 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191226_170429-AFC4F.jpg 26-Dec-19 08:08 AM oh boi, either my ion gauge has died or my chamber took all day long to asymptotically go to 1.6e-9 mbar 26-Dec-19 08:17 AM either way, the gauge is glowing happily 26-Dec-19 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191226_125656-1CA58.jpg 26-Dec-19 08:51 AM Bottom section has a water sleeve adjacent to a flange. Had a ti sublimation pump mounted there 26-Dec-19 02:04 PM Some nice hardware. 27-Dec-19 06:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2872-BCBA0.JPG 27-Dec-19 06:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2873-F9D7C.JPG 27-Dec-19 06:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_2874-C0998.JPG 27-Dec-19 07:09 PM Now thats proper heavy duty 27-Dec-19 07:09 PM That thing is gona handle kilowatts easy. 27-Dec-19 07:11 PM https://www.relltubes.com/filebase/en/src/Datasheets/CSV1_500_0005.pdf 27-Dec-19 07:11 PM 3kvp working 5kvp tested and 45 amps RMS max 5-500pf 27-Dec-19 07:11 PM nice caps 28-Dec-19 12:06 AM https://youtu.be/Ainm97HwKBU 28-Dec-19 12:06 AM Wheeeee 28-Dec-19 12:06 AM \o/ 28-Dec-19 12:06 AM Now the harder hard part. 28-Dec-19 03:50 AM very nice 28-Dec-19 08:35 AM What do you think of these? 28-Dec-19 08:35 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-DAA3F.png 28-Dec-19 08:52 AM Gauges ? 28-Dec-19 10:38 AM Looks like it. 28-Dec-19 10:38 AM They're good gauges @ZeptoBars 28-Dec-19 10:38 AM but beware that they're more fragile than 901p 28-Dec-19 12:10 PM @Deleted User More fragile - you mean air bursts and other things could damage the filament? 28-Dec-19 12:11 PM Yes, and a rapid vent to atmosphere might not give it enough time to switch from bayard-alpert to pirani 31-Dec-19 07:45 PM latest ebay impulse buy. probably not something i needed to buy and it will be a year or two before i really do much of anything with this but for the price i could not say no... 31-Dec-19 07:45 PM https://i.gyazo.com/dd7d7018882c8e9b49a74c363d7b6de4.png 31-Dec-19 07:45 PM less than $200 and it has the hoses/compressor/cold head 31-Dec-19 07:45 PM just needs a helium fill i think 31-Dec-19 07:55 PM damn, that's awesome! 31-Dec-19 07:55 PM total steal 31-Dec-19 07:55 PM https://i.spirit.re/7tXYA.png 31-Dec-19 07:55 PM similar to your head 31-Dec-19 07:55 PM one step up 31-Dec-19 07:56 PM yeah i was looking at this: https://mmrc.caltech.edu/Vacuum/Cryo%20Pumps/CTI%20Cryo-torr100,7,7%208F%20pumps.pdf 31-Dec-19 07:56 PM i hooked everything up really quick just to make sure and everything sounds great 31-Dec-19 07:56 PM compressor only has around 7500 hrs on it and only 30hrs or so on the absorber in it 31-Dec-19 07:57 PM if you don't have a ton of helium in there and don't mind burning it all, I'd vent the system and pump the helium lines down all the way 31-Dec-19 07:57 PM the head has about 75psi and the compressor only around 30 31-Dec-19 07:57 PM and then top up with fresh UHP(important!!!) helium 31-Dec-19 07:57 PM yeah that's almost nothing 31-Dec-19 07:57 PM i have to look into where i can even get a helium fill 31-Dec-19 07:58 PM just rent a tank of ultra high purity helium and shove it in there 31-Dec-19 07:58 PM this was one of those things where you throw in an offer and expect to get told to stick it somewhere 31-Dec-19 08:02 PM filling with helium is easy 31-Dec-19 08:02 PM all you need is that quick connect adapter fitting, a piece of non-gassy hose, and a fitting for your tank 31-Dec-19 08:02 PM you can rent UHP tanks just as you can rent other gases 31-Dec-19 08:02 PM a 40L tank full of UHP helium is like $150 here(to rent), and you can fill a dozen of these systems up 31-Dec-19 08:05 PM thats not bad at all, probably more here though 31-Dec-19 08:05 PM was hoping i could just pay somewhere like $20 to get it filled 31-Dec-19 08:05 PM might have to see if i know anyone locally who already has a tank...doubt it 31-Dec-19 08:05 PM has to be UHP helium...right? heh couple helium tanks on craigslist localish to me but i doubt either are the ultra pure stuff 31-Dec-19 08:05 PM also...couple of the coating systems from the guy's shop: 31-Dec-19 08:05 PM https://i.gyazo.com/87233f9ab1eaf0c8dce633abf34b1bfc.png 31-Dec-19 08:05 PM https://i.gyazo.com/10f96843db6ee26ec9787134df7875a5.png 31-Dec-19 08:05 PM said he got the big blue vacuum vessel made for a case of beer haha 31-Dec-19 08:25 PM I've got a local welder like that. His work goes through several 55gal barrels a day (and luckily not caustic or oil). Have had him fab up a furnace, concrete mixer, and plasma cut various designs into them for my yard debris burn barrels. Might have him gander at that pic too! 31-Dec-19 08:25 PM Will probably have him over in a few weeks when I finish putting together my system and have him weld the 8020 aluminum extrusions into place. At least the frame/feet structure anyhow. 31-Dec-19 08:30 PM he said this was a place that made industrial pressure vessels and a friend of his brother in law worked there so he gives them the specs saying "how much?" and they said they didnt even know how to quote something that small 31-Dec-19 08:30 PM so it was probably a similar situation, scrap materials being put to use 31-Dec-19 08:55 PM @LRM no, it has to be UHP helium 31-Dec-19 08:55 PM any contaminants can damage the system 31-Dec-19 08:56 PM yeah that is what i was assuming, just wanted to make sure it was the only option 31-Dec-19 08:56 PM it's not an expensive option 31-Dec-19 08:56 PM go to Airgas or something, I think that's a big chain in the US 31-Dec-19 08:56 PM ask them to bill you only for the gas you use 31-Dec-19 08:56 PM you won't use a lot at all 31-Dec-19 08:57 PM yep just have to look into it to see what fittings i will need to do it and such 31-Dec-19 09:00 PM Airgas is indeed the big player here in the US. They are all over the place. Way closer to your nearest one than you imagine, lol. 31-Dec-19 09:06 PM looks like praxair and airgas are not too far, might have to wait for the holiday to see what the options are. 31-Dec-19 09:06 PM may just wait awhile for the fill thing until i get a place set up to use it 31-Dec-19 09:08 PM just run it in air and make LN2 :P 31-Dec-19 09:08 PM that was a thought actually hahaha 31-Dec-19 09:08 PM part of why it is worth the shelf space 31-Dec-19 09:09 PM that's partly why I want one.. lots of neat stuff you can do with such an incredibly cold source 31-Dec-19 09:09 PM i can barely believe i got this still 31-Dec-19 09:10 PM I feel ya. That chamber listing I picked up the other week still has me reeling 31-Dec-19 09:10 PM offered $180 after asking if he had the helium lines still and expected to get told to get lost or at the very least a counteroffer 31-Dec-19 09:10 PM so a bit under $200 after california's taxes and going to pick it up 31-Dec-19 09:10 PM is there any evidence that the listing was up for a long period of time or similar? 31-Dec-19 09:10 PM I've been using google's cache and the like to try to judge how long a given thing has been listed/relisted... sporadic results. I want to be able to tell how desperate they may be 31-Dec-19 09:12 PM it was posted the day after christmas 31-Dec-19 09:12 PM I've also been adding stuff willy nilly to my wishlist to trigger the seller to do the special offer sort of thing 31-Dec-19 09:12 PM https://www.ebay.com/itm/333427581207 31-Dec-19 09:12 PM he has some other cool stuff 31-Dec-19 09:12 PM like a huge optical flat (he makes them) 31-Dec-19 09:12 PM there's a decent chunk of a cylindrical auger electron scope up for like 1200 and had the seller offer me 600 31-Dec-19 09:12 PM still passed as I haven't determined how likely it is I would find time to revers engineer some random undocumented sensors 31-Dec-19 09:13 PM yeah that seems like a big gamble if you are paying more than scrap value 31-Dec-19 09:14 PM yep 31-Dec-19 09:14 PM without a reliable/quantized electron and ion source I'd have no hope of reversing something like a random mcp or secondary detector or xds or whathaveyou 31-Dec-19 09:14 PM maybe in a few years 31-Dec-19 09:14 PM added that seller to my list - thanks 31-Dec-19 09:14 PM oh not to mention how totally rare it is any of those sem/tem listings have any cables whatsoever 31-Dec-19 09:20 PM yeah this guy bought it intending to use it but decided switching from the diffusion pumps wasnt worth the time 31-Dec-19 09:20 PM then it sat for im not sure how long 31-Dec-19 09:21 PM just long enough, I'd say 31-Dec-19 09:21 PM he had to go find the helium lines in a crate of wire/cable he was telling me 31-Dec-19 09:21 PM guess that happens when you have a big shop full of 35yrs of stuff 31-Dec-19 09:21 PM or you lack organizational skills 31-Dec-19 09:22 PM or worse, both 31-Dec-19 09:22 PM lol true 31-Dec-19 09:23 PM kicking myself i didnt ask to take photos of his other stuff 31-Dec-19 09:23 PM add in wealth and hobbies and poof, you're on some american TV show and they're throwing your stuff in dumpsters 31-Dec-19 09:23 PM that 4' cast iron lapping table was super impressive 31-Dec-19 09:23 PM yea I'd like to see his personal telescope(s) 31-Dec-19 09:23 PM 'cause you know he probably has some 22" dobsonian or similar that he hand figured 31-Dec-19 09:24 PM 3 stations for polishing/lapping and one just gets a big 2" thick 20" diameter granite slab 31-Dec-19 09:24 PM im not sure what the largest mirror he could fit in those chambers for coating would be... 31-Dec-19 09:24 PM he just uses a silicone ring and bell jar and moves it around spot by spot 31-Dec-19 09:24 PM always starts off with the disney logo 31-Dec-19 09:26 PM he does have the bell jar that was originally on the blue system...but wrong city he is in Placentia not Anaheim 01-Jan-20 12:35 PM Disney logo? 01-Jan-20 03:08 PM ah, yes I suppose not the logo - at least not the modern one - but the mouse ears iconic image I meant 01-Jan-20 03:08 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-AF5FE.png 01-Jan-20 03:08 PM implying he was doing little bits at a time since the workpiece is larger than his equipment can handle 01-Jan-20 07:06 PM Sorry I must have missed something, I guess you're talking about drilling holes out of some materiat? 01-Jan-20 07:19 PM i think he was joking because of the size of polishing/lapping machine i was lamenting not having any photos of (4foot diameter, 2in thick cast iron plate w/ 3 stations about +20inches diameter) at the place i got that cryopump 01-Jan-20 07:19 PM and also the coating systems 02-Jan-20 01:08 AM yes, I was joking 05-Jan-20 11:15 PM https://youtu.be/WC4q21XhV-A 05-Jan-20 11:15 PM It's coming. Eventually. 05-Jan-20 11:17 PM nice, what are you building? 05-Jan-20 11:18 PM It's a very low cost(<$30) AC servo drive for very cheap(<$20) motors 05-Jan-20 11:18 PM To be, eventually, a no compromise drop-in replacement for 3D printers, DIY CNC gear, and the like 05-Jan-20 11:18 PM In quantity it will probably be closer to $20 than $30 05-Jan-20 11:38 PM nice! 06-Jan-20 08:25 AM https://media.discordapp.net/attachments/499873492477411339/663779444430733325/DSC_2905.JPG 06-Jan-20 08:25 AM https://media.discordapp.net/attachments/499873492477411339/663779739193966603/DSC_2906.JPG 06-Jan-20 11:38 AM https://photos.app.goo.gl/6ZXK7Lat2reEFjo1A 06-Jan-20 11:38 AM also @GigaSquirrel I mentioned a rattly bit 06-Jan-20 11:38 AM https://photos.app.goo.gl/o9XWumAoFG2ZaNFd9 06-Jan-20 11:38 AM glad I opened it haha 06-Jan-20 11:39 AM oh wow yep 06-Jan-20 11:39 AM I got a new nut on it 06-Jan-20 11:39 AM https://photos.app.goo.gl/xprkCD9Bt6V1VuCg6 06-Jan-20 11:39 AM but damn, that's nice 06-Jan-20 11:39 AM https://photos.app.goo.gl/wpeVG5gVz36qrYMP7 06-Jan-20 11:39 AM these little hand made "transformers" are cute 06-Jan-20 11:39 AM https://photos.app.goo.gl/SPzxboLxTNtZubdx9 06-Jan-20 11:40 AM nawww 06-Jan-20 11:40 AM yep 06-Jan-20 11:40 AM https://photos.app.goo.gl/bmHzgzLYA7ZzGjUD9 06-Jan-20 02:45 PM @Conmega that's in hell of a chamber 07-Jan-20 12:17 AM some stuff working 07-Jan-20 12:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_CE5142088651-1.small-5D496.jpeg 07-Jan-20 12:17 AM going to read a bit more about sputter deposition as i'd like to get that going 07-Jan-20 12:23 AM pressure is still a bit high, but it's a start! 07-Jan-20 12:23 AM can you tell by the color? 07-Jan-20 12:24 AM mostly shape 07-Jan-20 12:25 AM i need to connect the MKS901P -- i don't have an RS232 converter. made one in analog but was a pain to move power supply over there so just have some mediocre tubing 07-Jan-20 12:25 AM also have a magnet in a magnet underneath as i assume that affects shape 07-Jan-20 12:28 AM I'm gonna guess you're at ~1 mbar, maybe half of that 07-Jan-20 03:37 AM https://media.discordapp.net/attachments/499873492477411339/663588881551196190/DSC_2904.JPG 07-Jan-20 03:37 AM oh also I got a nice baby hi-pot tester the other day from a friend 07-Jan-20 10:45 AM @samy what vacuum pump are you using? 07-Jan-20 12:03 PM @Nixie trivac d25e 07-Jan-20 12:06 PM not d2.5e but d25e? 07-Jan-20 12:08 PM here is after waiting ~20 mins to pump down, but i need to improve the connectors/piping, will turn some new flanges this weekend 07-Jan-20 12:08 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_8604-EEF22.PNG 07-Jan-20 12:08 PM sorry, yeah d2.5e 07-Jan-20 12:09 PM yea was going to say 25 is a MASSIVE pump haha 07-Jan-20 12:09 PM or at-least very big 07-Jan-20 12:09 PM D40E... boy saw one of those sitting on a pallet at work... 07-Jan-20 12:09 PM that thing was a big boy 07-Jan-20 01:05 PM Als, what rubber are you using to seal the jar lid? 07-Jan-20 01:29 PM Actually just using sticky tack / putty -- i tried a Buna sheet first and that didn't work, and I was just in a rush to try to get it working last night so tried putty and that worked 07-Jan-20 01:31 PM yikes 07-Jan-20 01:39 PM Silicone gaskets like $2 on McMaster 07-Jan-20 02:18 PM it's hard not to hack stuff together when excited 07-Jan-20 02:18 PM (read: impatient) 07-Jan-20 02:19 PM but it's hard to get hacked together stuff working right :P 07-Jan-20 02:20 PM agreed! i promise there will be improvements 07-Jan-20 02:20 PM Great! You're already on the right track tho 07-Jan-20 02:26 PM waiting for Viton sheet to come in 07-Jan-20 02:26 PM then need to construct a new chamber - this was PoC with JB Kwik + pipe fittings :\ will create aluminum connector to KF16 instead and use viton to seal both sides and get rid of all the automotive connectors on the vacuum side. just trying to read up more on sputtering so i can get something that will hopefully work successfully for ITO and figure out cooling 07-Jan-20 02:36 PM One way to avoid cooling issues is to build the cooling into the atmospheric side 07-Jan-20 02:36 PM Something that would never touch vacuum 07-Jan-20 02:37 PM I see 07-Jan-20 02:38 PM sorry to rain on your parade but depending on how stiff the viton sheet is you may not have a whole lot of luck with using that on your jar set up 07-Jan-20 02:38 PM ahh, what would you suggest? 07-Jan-20 02:38 PM no need to be sorry, i really appreciate all the info all of you are sharing! 07-Jan-20 02:39 PM if you have two flat surfaces maybe try an oring? just wanted to make you aware that the sealing forces for sheets are pretty high 07-Jan-20 02:39 PM The viton sheets are pretty soft 07-Jan-20 02:39 PM Especially if thick-ish 07-Jan-20 02:39 PM depends on the durometer 07-Jan-20 02:46 PM why do my viton rings smell like mint? 07-Jan-20 02:46 PM not complaining; it's nice 07-Jan-20 02:49 PM rings? 07-Jan-20 02:49 PM stick them into the vacuum chamber(as in, inside, not as a seal) and pump for a while 07-Jan-20 02:49 PM see if the smell dissipates after 07-Jan-20 02:51 PM i have some viton o-rings that smell like mint, and just came across another site selling a sheet that explicitly states it's "Cinnamon Scented" http://www.warco.com/sheet-rubber/fluoroelastomer/commercial-viton-a-brown/ 07-Jan-20 02:52 PM Wait what? 07-Jan-20 02:52 PM That's definitely interesting 07-Jan-20 02:59 PM i just checked and the sheet i ordered also says it's cinnamon scented 07-Jan-20 02:59 PM Big Mint probably flexing their dominance in the elastomer industry 07-Jan-20 03:04 PM yeah that's a bad idea 07-Jan-20 03:04 PM but viton bakes up to ~100C happily 07-Jan-20 03:04 PM up to ~150C unhappily. 07-Jan-20 03:10 PM Lol big mint is probably not optimal for vacuum 07-Jan-20 03:29 PM you won’t pull the pressure you want but it’ll smell good atleast 07-Jan-20 03:29 PM so...is there any reason people can think of for scented viton? 07-Jan-20 03:29 PM compromises 07-Jan-20 03:29 PM what is the target market there? 07-Jan-20 03:29 PM maybe it is just a byproduct of manufacturing...weird. "The type of curative or vulcanization agent used will also influence the physical properties and eventual life expectancy of the fluorocarbon seal in service. Here again, three basic chemical families are used to effect vulcanization of the polymers; the diamines (one type imparts a characteristic cinnamon odor)" - https://www.mositesrubber.com/technical/technical-info/fluoroelastomer/ 07-Jan-20 03:42 PM interesting 07-Jan-20 03:57 PM @samy what power supply are you using? 07-Jan-20 04:05 PM @nmz787 US 120VAC mains -> variac -> MOT -> 2CL2FM diode 07-Jan-20 04:06 PM Nice, i have all the pieces to do the same, different diode, from eBay 07-Jan-20 04:06 PM How long did it take you? 07-Jan-20 04:08 PM the whole setup? hmm i joined here last month and you guys suggested the Trivac, ordered it and it arrived ~jan 1 07-Jan-20 04:09 PM More like actually piecing it together, I think I have all the parts except maybe a test vacuum chamber 07-Jan-20 04:09 PM set up the DC supply last night as the diodes arrived, probably have spent more time turning stuff on mini lathe more than anything as i'm just getting started there 07-Jan-20 04:10 PM Lol I also have a mini wave, haven't used it since I picked it up in I think March 07-Jan-20 04:10 PM Lathe 07-Jan-20 04:11 PM i'm sure you know but if you do use a MOT, make sure you have a ton of separation and if you use capacitors, ensure there's bleeder resistor, make sure there's no way you can get near/touch it, lots of death etc etc 07-Jan-20 04:11 PM i'm not sure how much power this all requires but will measure it when i get back to it this weekend, wondering if i can use a flyback transformer instead to improve safety, otherwise i will have to make an enclosure for the power and add some safety/deadman switches 07-Jan-20 04:20 PM Separation? 07-Jan-20 04:20 PM Between the electrodes in the chamber? 07-Jan-20 04:20 PM I've also got two computer controlled power supplies that go up to I think four KV, so that's always an option to try for me if my chamber is too small 07-Jan-20 04:41 PM just insulating and physically keeping everything on the HV side of the MOT far away from any metal and each other (even the LV side is scary enough if touched) 07-Jan-20 04:41 PM what supplies are they @nmz787? 07-Jan-20 04:54 PM You need a relatively high current for sputtering @samy 07-Jan-20 04:54 PM A MOT paired with a variac is pretty much the perfect cheap supply 07-Jan-20 04:54 PM Rectified and filtered of course, but the microwave oven cap and diode is all you need really 07-Jan-20 04:58 PM Ahh, okay, thanks Spirit 07-Jan-20 04:58 PM do people typically place a bleeder on the cap? 07-Jan-20 04:59 PM it's a good idea, it can stay charged for a while 07-Jan-20 04:59 PM I'd put a voltmeter in parallel with the cap, and an ammeter on the low side 07-Jan-20 05:00 PM cool 07-Jan-20 05:00 PM an HV voltmeter, or do you do a resistive divider? 07-Jan-20 05:01 PM divider makes more sense at this voltage 07-Jan-20 05:01 PM often a microwave cap contains an integral bleeder, but be sure to verify/know its time constant 07-Jan-20 05:01 PM ahh 07-Jan-20 05:01 PM or just a 10k 1/4W resistor across it 07-Jan-20 05:01 PM now i just need a futuristic case for it with glowing lights...that all dim when the chamber is going 07-Jan-20 05:02 PM magnetron sputtering is quite pretty 07-Jan-20 05:02 PM The microwave cap I have has a 10 mohm bleeder 07-Jan-20 05:02 PM that'll take a long time to bleed 07-Jan-20 05:02 PM in response to earlier things 07-Jan-20 05:03 PM 10k will get a bit warm but it will bleed fast 07-Jan-20 05:03 PM i was hiding behind a large opaque acrylic sheet when trying to get it going last night...and when nothing imploded or blew up looked over...it was so pretty 07-Jan-20 05:03 PM 2kv/10k = 200uA of bleed current 07-Jan-20 05:03 PM I toss a pair of pliers to short it after 2 min ... probably not great but not huge sparks 07-Jan-20 05:03 PM my hv setup is not ideal lol 07-Jan-20 05:16 PM @samy my power supplies are: biorad 3000xi, Life Technologies BRL Model 4000 07-Jan-20 05:17 PM ahh nice 09-Jan-20 04:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200109_125458-61E65.jpg 09-Jan-20 04:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200109_131219-63229.jpg 09-Jan-20 04:32 AM final steps, gotta wait for the epoxy to set 09-Jan-20 07:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200109_164720-6A54D.jpg 09-Jan-20 07:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200109_164911-BCE3F.jpg 09-Jan-20 12:57 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200109_145735-61784.jpg 09-Jan-20 12:57 PM Main bearing on that Pfeiffer/Balzers TPH-1500 09-Jan-20 12:59 PM ohh, I think this is the first bearing change we have here! 09-Jan-20 01:06 PM Haha 09-Jan-20 01:06 PM Slow going with no service manual/procedure. Step by step and give the engineers their credit and don't go off down a stupid path to break something. Make the tools you need and dont half a$$ with some cobbled together sticks 09-Jan-20 01:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200109_150917-04978.jpg 09-Jan-20 01:06 PM Stator stack 09-Jan-20 01:18 PM did you mark the rotor rotation offsets? 09-Jan-20 01:18 PM they're dynamically balanced angularly as well 09-Jan-20 01:19 PM the... stators are balanced? 09-Jan-20 01:19 PM ignore the brainfart 09-Jan-20 01:19 PM rotors 09-Jan-20 01:19 PM yeah got that 09-Jan-20 01:38 PM I did mark the rotors and stators and pretty much everything else lol, but supposedly it's not a concern for just bearing replacement 09-Jan-20 01:38 PM Went tagging with dykem blue and red with wiggles and streaks! 09-Jan-20 01:38 PM Even where surely unnecessarily 09-Jan-20 01:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20200109_154009-02062.jpg 09-Jan-20 01:41 PM Do you have a controller for it? 09-Jan-20 02:00 PM I do. Haven't wired up a cable yet though. Got the MIL-DTL-26482 14-19 connector in, waiting on my wire bundle and the Telegartner fitting and DIN 41622 stock so I can make an OEM cable for proper resaleability if I so choose 09-Jan-20 02:00 PM I've also got a TPU 060 and TCP 121 en route for backup 09-Jan-20 02:03 PM Ah I've got a TPU 060 as well 09-Jan-20 02:03 PM A bit small for your big chamber though 09-Jan-20 02:03 PM Then today I got a MVP055-3 for the first backing test and will have some Edward's rotary of whatever kind in the coming weeks 09-Jan-20 02:03 PM Yea I figured I could at least test with it while sorting out a bigger pump. Plan is to put it on another chamber entirely or serve as a pump for an airlock 09-Jan-20 02:10 PM Hmm I don't think you need another turbo for an airlock 09-Jan-20 02:10 PM Unless your process absolutely cannot tolerate even a moderate increase in pressure 09-Jan-20 02:10 PM The small turbos (at least the one I have) doesn't like starting and stopping often 09-Jan-20 02:10 PM Remember most of the wear happens during the accleration and deceleration phase. Once it's up to speed it will just spin happily 09-Jan-20 02:19 PM Good point. Either way, I'll find some use for it or resell it after making cables for it =P 09-Jan-20 02:19 PM Heater electrodes maybe? Or something? 09-Jan-20 02:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20200109_162304-25B91.jpg 09-Jan-20 02:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20200109_162505-8A6E8.jpg 09-Jan-20 02:19 PM There's a pair on each side of the cylinder. 180 degrees apart. 09-Jan-20 02:36 PM Are they actually electrically insulated from the case? 09-Jan-20 02:50 PM I have them on my pump as well! 09-Jan-20 02:50 PM Pfeiffer TPH-062 09-Jan-20 02:51 PM I suspect I have them on mine too then, not with the turbo at the moment 09-Jan-20 03:09 PM Dont have my meter out here. Will check once I yet the rotor out 09-Jan-20 08:00 PM Got a cheapie K40 laser. Here it is making a 3 mm hole in some .020 mica 09-Jan-20 08:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/60031964719__C3587DA8-95E2-4833-A7DF-17479-71398.MOV 09-Jan-20 08:02 PM @Charles safety tip: unless that is soda lime/boro glass, that window is useless and you should replace it ASAP 09-Jan-20 08:02 PM @funranium would agree 09-Jan-20 08:02 PM only real glass is opaque at the 10600nm wavelength 09-Jan-20 08:04 PM Will regular window glass work? 09-Jan-20 08:04 PM yes, it should 09-Jan-20 08:04 PM place it right over the lid, keep whatever that is in place 09-Jan-20 08:04 PM Ok. 09-Jan-20 08:27 PM There. Thanks picture frame from the wall! 09-Jan-20 08:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-C66D1.jpg 09-Jan-20 08:30 PM That should be a lot safer 09-Jan-20 08:30 PM And a general note: anywhere the exposed beam can be, you cannot. 09-Jan-20 08:30 PM At these power levels it's instant and permanent blindness 09-Jan-20 08:35 PM Flaming laser mayhem and death, for $340 shipping included thanks to Shenzhen! Hahaha 09-Jan-20 08:35 PM heh 09-Jan-20 08:35 PM $340 is a good deal 09-Jan-20 08:35 PM 25W tube? 09-Jan-20 08:35 PM They claim 35 and it looks to be so 09-Jan-20 08:35 PM 25W it is 09-Jan-20 08:37 PM Not that it means anything but this tube is about 4 inches longer than the 25 watt one they had at the maker space. But as I said. Don’t really mean anything, nor do wattage ratings from anything on eBay! 09-Jan-20 08:37 PM Could be genuine 30 then 09-Jan-20 08:37 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-D9E66.jpg 09-Jan-20 08:38 PM Laser Export is a label that is going into my collection 09-Jan-20 08:38 PM The laser is exported here -> 09-Jan-20 08:38 PM you should probably actually ground it separately, to something you know is ground 09-Jan-20 08:38 PM if something fails you've got 20-30kV on the case 09-Jan-20 08:38 PM at quite a few mA 09-Jan-20 08:38 PM another tip for these lasers: don't drive them over 90% and they'll live for a while 09-Jan-20 08:40 PM Yeah. First thing I did before plugging it in was ground continuity test 09-Jan-20 08:40 PM The power supply actually looks pretty legit. Nice laminations and taping on the transformer. FRG pcb, and pretty standard looking parts. Not western name brand, but at least not fake name brand 09-Jan-20 08:40 PM Totally un related. What are they saying in your region about the Ukrainian plane that went down? Canada is saying it was shot down based on satellite and radar data. 09-Jan-20 08:51 PM No idea, I don't really read/watch the news 09-Jan-20 08:51 PM Meanwhile, version 2 of my drive is coming together 09-Jan-20 08:51 PM https://i.spirit.re/O5ONP.png 09-Jan-20 09:28 PM dang those laser cutters are going for that cheap now? 09-Jan-20 09:56 PM Nice looking board there. And yes, they are super cheap. 09-Jan-20 09:59 PM @Deleted User, have you ever used Cypress PSoC? I use it for everything, even though it seems like STM32 is everybody's favorite micro. PSoC has nice analog stuff and digital logic. It can even run verilog. 09-Jan-20 10:02 PM STM32 is "cheap and fasssstttt" when you don't look to closely at the 4 billion waitstates you have to wait through just to read ram.... 09-Jan-20 10:02 PM I have heard great things about the Cypress parts 09-Jan-20 10:03 PM @piGuy it costs quite a bit more and I'm pretty familiar with ST's tools 09-Jan-20 10:03 PM no analog stuff needed here at all, besides the ADCs 09-Jan-20 10:03 PM not to mention it's quite a bit slower 09-Jan-20 10:03 PM this thing costs $4.7 and runs at 160MHz with hardware math acceleration 09-Jan-20 10:04 PM I've done a 3 axis closed loop servo system with one PSoC chip. Hardware quadrature decoders using the digital logic 09-Jan-20 10:05 PM and a fast 12-bit ADC 09-Jan-20 10:05 PM this chip also has quadrature decoding 09-Jan-20 10:05 PM Yeah PSoC certainly isn't the cheapest chip out there 09-Jan-20 10:05 PM on several channels in fact, all in hardware, with index 09-Jan-20 10:05 PM you can use the normal timers in dual channel input encoder mode 09-Jan-20 10:06 PM @Deleted User again you should read what I said in the slash out... yes STM32s can be fast but that means NOTHING to performance of actually running tight code. because waitstates for ram/rom/etc 09-Jan-20 10:06 PM https://i.spirit.re/9Qntl.png 09-Jan-20 10:07 PM its actually a really bad marketing strategy that has paid off for them 09-Jan-20 10:07 PM @Conmega I've looked at the benchmarks and calculations in the appnotes and sheets 09-Jan-20 10:07 PM also, did I mention 160MHz? 09-Jan-20 10:07 PM it has hardware math acceleration, not just an FPU 09-Jan-20 10:07 PM rolls eyes just use the part your familar with and like and works out for you 09-Jan-20 10:07 PM it really doesn't matter, but the point is you have to take everything with a grain of salt very rarely do you see something running that fast that doesn't have some waitstates for ram and such 09-Jan-20 10:08 PM https://i.spirit.re/R3UA3.png 09-Jan-20 10:08 PM I've been fairly impressed with my little cheap STM32F429 dev board 09-Jan-20 10:08 PM even TI's parts getting that fast have wait states 09-Jan-20 10:08 PM Nice to play with and you get easy GUI dev tools that are literally drag and drop 09-Jan-20 10:08 PM Fast enough to do anything you need in a pinch really 09-Jan-20 10:09 PM I was able to get FOC-ish control running on a 48MHz Cortex M0 with no FPU or even division 09-Jan-20 10:09 PM so I reckon I'm going to be just fine with 160MHz and hardware FPU+hardware math 09-Jan-20 10:10 PM zero overhead time can just mean a math calculation could take multiple instructions and the wait states are accounted for in that. top level stuff like that can always be spun nicely, and honestly 50-100mhz doesn't really become noticable unless your REALLY pushing your part 09-Jan-20 10:10 PM Are you writing assembly? 09-Jan-20 10:10 PM There's a video from Cypress using one PSoC for like 8 BLDC drivers, running the PID loop in hardware using the DSP. 09-Jan-20 10:11 PM Unless you're optimizing it at the low level, you're still going to have overhead 09-Jan-20 10:11 PM Now, don't get me wrong, TI's C2000 series is awesome for motor control and they have specific IP for that 09-Jan-20 10:11 PM But they also cost three times as much, have half the peripherals, and the development environment was, at least to me, very unfriendly. 09-Jan-20 10:11 PM I don't want to spend two weeks bringing up the hardware before I can start writing the code 09-Jan-20 10:11 PM And I'm pretty sure I'm going to shave the wait state difference with the hardware math accelerator alone 09-Jan-20 10:11 PM 500% is nothing to scoff at 09-Jan-20 10:17 PM Depending on what your doing you might have little snippets of assembly code for tight stuff. Also I have never not just have TI's tool-chains and hardware not JUST WORK. I remember I tried an STM at one point and it was just frustration, all the tools are half baked, software doesn't give good error messages. And well nothing is the same, there is 400 tools made by 200 different people. Its just confusing. Either way as I said, use what your comfortable with and setup for. There are a million ways to do something and a million parts to use. 09-Jan-20 10:18 PM Sure, it's just different tools 09-Jan-20 10:18 PM I have to say ST's toolchain integration is really not the most intuitive to learn, perhaps they just want too much out of a single thing 09-Jan-20 10:19 PM But when I can get a chip that will let me write it completely free of worry of optimization, why not? 09-Jan-20 10:19 PM Any recommendations on advanced tutorials/starting points? I've been just using the CubeMX IDE for my stuff and nothing beyond that 09-Jan-20 10:19 PM just run micropython then... jeez... 09-Jan-20 10:19 PM I'm using CubeMX and HAL 09-Jan-20 10:19 PM With VSCode and Platformio to build 09-Jan-20 10:19 PM because I like one-click development 09-Jan-20 10:20 PM I dunno I just install one program from TI and click one button and it programs my micro and has on chip debugging 09-Jan-20 10:20 PM and that one piece of software from TI works for all like 100,000 of their micros 09-Jan-20 10:20 PM its wonderful 09-Jan-20 10:21 PM Yeah with ST they're trying to go that route as well with the whole CubeMX thing 09-Jan-20 10:21 PM How many pages of datasheet do you have to trundle through to get the peripherals actually working the way you want them to, though? 09-Jan-20 10:21 PM Would love to try out the TI stuff 09-Jan-20 10:21 PM If I want to run bare C, VSCode + Platformio is like a 3 click process 09-Jan-20 10:22 PM they have two docs per chip generally 09-Jan-20 10:22 PM But it's all the abstraction libs that do wonders 09-Jan-20 10:22 PM I don't need to read 10 pages of register manuals to figure out how to make this timer do a thing I want it to do 09-Jan-20 10:22 PM the datasheet, electrical stuff, then the chip family's user guide 09-Jan-20 10:22 PM I just go into CubeMX(which generates HAL code), tick the box I want, and click "generate" 09-Jan-20 10:22 PM Does TI have such a configurator? 09-Jan-20 10:24 PM like I dunno I futz with the docs for about an afternoon, then from that point forward its pretty simple to spin up or just copy existing code really... 09-Jan-20 10:24 PM a register description is like 1/10th of a page? 09-Jan-20 10:24 PM Which you have to look for and know what you're looking for 09-Jan-20 10:24 PM uhm 09-Jan-20 10:24 PM theres a table of contents, then like 09-Jan-20 10:24 PM a summary of a device 09-Jan-20 10:24 PM https://i.spirit.re/O9pkt.png 09-Jan-20 10:25 PM its like not hard 09-Jan-20 10:25 PM this alone is worth its weight in gold 09-Jan-20 10:25 PM a GUI clock configurator 09-Jan-20 10:25 PM It will even auto-configure for you if you input a desired clock 09-Jan-20 10:26 PM maybe you should use sketch as your programming language of choice 09-Jan-20 10:26 PM Come on 09-Jan-20 10:26 PM like your complaining about yes an annoying part of setting up for working on a microcontroller, but its like 10% of the development life cycle 09-Jan-20 10:26 PM I can skip that 10% with a click of a button 09-Jan-20 10:26 PM and the generated code is readable 09-Jan-20 10:26 PM you can even mix and match libraries between a high level HAL and low level hoity-toity drivers 09-Jan-20 10:26 PM and it will generate a soup for you 09-Jan-20 10:28 PM I dunno all I know is learning how to touch the registers and the operations to do so has ended up saving me later on when I NEEDED to poke a register somewhere else that has nothing to do with setup but for like pushing data out and well it saved me time 09-Jan-20 10:28 PM It's not like I don't know how it's done 09-Jan-20 10:28 PM But do I want to spend an hour reading up how to set the timers for this particular chip with this particular clock config to get what I want? 09-Jan-20 10:28 PM Not really 09-Jan-20 10:30 PM but you learn nothing about the implementation of that timer, sometimes a single bit of configuration being automatically set can change significantly how an operation on that timer happens.... its important to RTFM 09-Jan-20 10:30 PM The generated HAL code goes through that step by step 09-Jan-20 10:30 PM with human readable names 09-Jan-20 10:30 PM And it's got macro names for all the variables! 09-Jan-20 10:31 PM so you have to generate hal in every which mode just to learn about every way you can use something? 09-Jan-20 10:31 PM seems really annoying to me 09-Jan-20 10:31 PM seems like a trial and error method of figuring out how you want your chip configured 09-Jan-20 10:31 PM So instead of going REG |= 0x80085, it does hdma_cordic_write.Init.MemDataAlignment = DMA_MDATAALIGN_WORD; 09-Jan-20 10:31 PM then it just does if (HAL_DMA_Init(&hdma_cordic_write) != HAL_OK) Error_Handler(); 09-Jan-20 10:31 PM you follow that function and it shows each register 09-Jan-20 10:31 PM that is just neat 09-Jan-20 10:31 PM and simple 09-Jan-20 10:32 PM my friend who doesn't even touch low level stuff said the first one is much simplier and easier to understand like lol what 09-Jan-20 10:33 PM what does REG |= do though? 09-Jan-20 10:33 PM so instead of having to know one register name I have to know these macros which point to register names in some dug down library? 09-Jan-20 10:33 PM https://en.wikipedia.org/wiki/Operators_in_C_and_C%2B%2B 09-Jan-20 10:33 PM I dunno just learn your language man 09-Jan-20 10:34 PM you have to go to the datasheet and figure out why setting it to this particular value does what you want 09-Jan-20 10:34 PM or you can... not do that 09-Jan-20 10:34 PM right... its like 1/10th of a page of documentation 09-Jan-20 10:34 PM which you have to look for 09-Jan-20 10:34 PM its really simple and easy to read 09-Jan-20 10:34 PM yes PDFs with clickable navigation has existed 09-Jan-20 10:34 PM thank you 09-Jan-20 10:35 PM now repeat that ten times 09-Jan-20 10:35 PM for a particular peripheral 09-Jan-20 10:35 PM and you've burned an hour or two 09-Jan-20 10:35 PM so instead of of looking in 10 places in a doc you click through 10 gui panels 09-Jan-20 10:35 PM its the same amount of effort just different 09-Jan-20 10:35 PM like seriously 09-Jan-20 10:35 PM you have to read those panels 09-Jan-20 10:35 PM but then you encounter some minor issue that you missed, where setting that particular combination of registers to that value completely breaks some obscure operational mode 09-Jan-20 10:35 PM you burn a day 09-Jan-20 10:36 PM unless you read the manual? 09-Jan-20 10:36 PM the big one. 09-Jan-20 10:36 PM not the user's guide, no no. 09-Jan-20 10:36 PM I have been bitten more by automatic tools which miss edge cases like that over actually just reading stuff 09-Jan-20 10:36 PM point is, these tools are a massive help 09-Jan-20 10:36 PM and when you have a choice of doing both, I personally would save the hours and hours of config and bring-up time 09-Jan-20 10:36 PM I don't care which bit something is set to if it works as expected, and it does 09-Jan-20 10:38 PM that's just a very ignorant way to live life but ok that's your choice 09-Jan-20 10:38 PM I don't think it's ignorant to accept conveniences 09-Jan-20 10:38 PM you're free to write barebones library-free code forever 09-Jan-20 10:41 PM Using a salad spinner is a convenience but robs you of no useful experience... Using a tool written by someone who understands a chip and it's operations to make it so you can skip having to understand the tool is a convenience but not learning about the chip more is losing useful experience. If you ever plan to use the chip again, I think your wasting more time skipping this understanding. If your going to use the chip or the family once and never touch it again then I suppose its a fair shortcut. 09-Jan-20 10:42 PM I don't plan on using this particular chip exactly the same way again 09-Jan-20 10:42 PM Not much experience lost if I can port the same library code in minutes though 10-Jan-20 02:59 AM @Deleted User interesting re: using real glass... I also have that similar orange colored plexiglass stuff on my K40... I'm not blind yet after using it a bunch over the years... but I guess my vision could be worse? IDK, haven't really noticed anything much. I do have some "eagle pair" laser glasses that I think I was generally using when cutting and looking in the chamber 10-Jan-20 11:12 AM @nmz787 the coating on that shield is at best questionable 10-Jan-20 01:08 PM After closer examination the yellow stuff is not proper laser shielding. It’s just yellow/orange colored acrylic. What wavelength are these lasers typically? 10-Jan-20 01:10 PM 10600nm 10-Jan-20 01:10 PM CO2 with traces of He+Ne+Ar 10-Jan-20 01:10 PM goes straight through most(translucent) plastics, but blocked completely by glass 10-Jan-20 01:10 PM https://i.spirit.re/3cEoo.png 10-Jan-20 01:10 PM Same wavelength range as thermal imaging. 10-Jan-20 01:10 PM In fact, right in the middle of the usual 7-14um range. 11-Jan-20 07:39 PM Many fine wisdoms have been shared by @Deleted User while I've been at CES. The yellow/orange glasses the come with most "FREE LASER SAFETY GOGS WITH PURCHASE" are just welder's filters to cut broad spectrum UV and they're questionable at that. As long as they're made of polycarb, it should be fine for scatter from 10.6 micron work. 12-Jan-20 02:30 PM New revision of the servo drive went into production just now. Much more powerful 160MHz STM32 MCU, proper DRV8323 "everything chip" for gate drive, power supply, and feedback. FETs are rated at 30V 30A(low Rds(on) and gate charge), the rest can go up to 60V with appropriate passives. 12-Jan-20 02:30 PM https://i.spirit.re/TT2Ee.png 12-Jan-20 02:30 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/UniServo_Board-0522E.pdf 12-Jan-20 02:30 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/UniServo_Schematic-8C925.pdf 12-Jan-20 02:30 PM Schematics and boards attached in case anyone wants to look 12-Jan-20 02:30 PM (will be properly opensource later, no stealing!) 12-Jan-20 03:18 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_7702-274A6.jpg 12-Jan-20 03:18 PM This is about the best accuracy i can get on mica. It just gets too fuzzy. Should be fine for the large stuff I am doing but nowhere near good enough for like recieving tubes. Still would need to make real stamping dies for those. 12-Jan-20 03:18 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_7703-CE087.jpg 12-Jan-20 03:18 PM Try using a very high pressure airblast 12-Jan-20 03:18 PM Maybe 2-3 bar 12-Jan-20 03:19 PM I am doing this at my kitchen table. Don’t want the dust all over. 12-Jan-20 03:19 PM That's what the exhaust is for! :P 12-Jan-20 03:20 PM There is no way the little fan in this thing could keep up. 12-Jan-20 03:20 PM You need a fan to suck all the air out and dump it through a wet bucket or something 12-Jan-20 03:20 PM A small centrifugal blower should work 12-Jan-20 03:20 PM It works very well however for its intended use. I have it just running to the window with a piece of wood around it and sealed up with some tape and no burning smell in the house so that’s good 12-Jan-20 03:20 PM It has a little low speed high volume blower/sucker built in and a couregated exhaust tube. I ran some acrylic on it and it was tolerable. Otherwise there are holes and gaps all over this thing. It would be a terrible mess to have assist gas. 12-Jan-20 03:22 PM You need at least a little assist 12-Jan-20 03:22 PM No assist = dead optics 12-Jan-20 03:22 PM It should have come with a little diaphragm pump in the kit 12-Jan-20 03:23 PM Meh. At this price point no it did not 12-Jan-20 03:23 PM You definitely need one, otherwise dust and smoke settling on the focusing lens will cause it to heat up and crack 12-Jan-20 03:24 PM There is no focusing lens. There is no beam collator. 12-Jan-20 03:25 PM Yes, there is 12-Jan-20 03:25 PM Only mirrors 12-Jan-20 03:25 PM Nope 12-Jan-20 03:25 PM In that little "nozzle" is a focusing lens 12-Jan-20 03:25 PM There is no little nozzle 12-Jan-20 03:25 PM The beam coming out of the laser tube is several mm in diameter 12-Jan-20 03:25 PM The collator is at the end of the laser itself 12-Jan-20 03:25 PM That wouldn't work because that's not how optics work 12-Jan-20 03:26 PM Oh the output lens. Serve. Nevermind. 12-Jan-20 03:26 PM But yeah. These have to collator at the end of the laser though. 12-Jan-20 03:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/CO2-K40-Stamp-Engraver-Laser-Head-Focal-50-8BB24.png 12-Jan-20 03:27 PM Is yours like this? 12-Jan-20 03:27 PM Or like this? 12-Jan-20 03:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/CO2-Laser-Rubber-Stamp-Engraving-Machine-K-53449.png 12-Jan-20 03:27 PM Yes. So to me that is not a collator 12-Jan-20 03:28 PM collimator 12-Jan-20 03:28 PM and yes, there is a collimating lens inside 12-Jan-20 03:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/31p04MjpK5L-38FA8.png 12-Jan-20 03:28 PM See im old and that means something different to me 12-Jan-20 03:28 PM When I used to play with that stuff we had that built into the output and it was a multicellular affair to get the coherent beam 12-Jan-20 03:29 PM the beam is coherent right out of the laser 12-Jan-20 03:29 PM that's why lasers are lasers 12-Jan-20 03:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Laser-beam1-7DC22.png 12-Jan-20 03:29 PM this is what happens at the moving head 12-Jan-20 03:29 PM I'm assuming the air assist input is not present on yours 12-Jan-20 03:30 PM Correct 12-Jan-20 03:30 PM you need at least a small fan to blow away the smoke 12-Jan-20 03:30 PM It has one 12-Jan-20 03:30 PM directly on the nozzle I mean 12-Jan-20 03:30 PM Does not have that 12-Jan-20 03:31 PM tape one on if you have to, anything to keep all the smoke away from the lens 12-Jan-20 03:31 PM compressed air is how it's done because it's just easier to shove a hose in 12-Jan-20 03:32 PM Found on already on amazon 12-Jan-20 03:32 PM Still not going to use it on mica though. I don’t think you understand how big of a mess that will be 12-Jan-20 03:32 PM what happens if that lense is not kept clean enough? you start burning a hole through the lense instead of your work piece or just lose output power? 12-Jan-20 03:32 PM depends on how dirty it is 12-Jan-20 03:33 PM Probably crack the glass from heat 12-Jan-20 03:33 PM starts at the latter, ends up at the former 12-Jan-20 03:33 PM also...why not make tons of sparkly microscopic glitter? haha that doesnt sound fun to you? 12-Jan-20 03:33 PM you need at least a bit of airflow @Charles 12-Jan-20 03:33 PM doesn't have to be airblast 12-Jan-20 03:33 PM just enough to keep all the smoke out of the lens hole. 12-Jan-20 03:33 PM Like I have said the whole box has air flow 12-Jan-20 03:34 PM you could also go the ridiculous route and get some thin bellows hose(the non high vacuum kind), make a little housing around the lens, and just connect it to a vacuum cleaner 12-Jan-20 03:34 PM but that won't help the mica, only the dust and smoke 12-Jan-20 03:35 PM The white trapezoidal box is a inlet for a low pressure high volume fan 12-Jan-20 03:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-29A83.jpg 12-Jan-20 03:35 PM that should be alright-ish if you keep cutting around the area where the scorch marks area 12-Jan-20 03:36 PM Actually I did a full bed size piece of acrylic yesterday. Worked just fine 12-Jan-20 03:36 PM sure, the lens just won't last long if you do that 12-Jan-20 03:36 PM the smoke easily kills these optics 12-Jan-20 03:36 PM remember that you're stuffing a lot of light through a small lens 12-Jan-20 03:37 PM Meh. I will clean it. 12-Jan-20 03:37 PM no solvents, DI water only 12-Jan-20 03:37 PM And it it goes crack, then just get a replacement. Hell the whole machine was $275 12-Jan-20 03:37 PM that is stupid cheap 12-Jan-20 03:37 PM wish it was that cheap here 12-Jan-20 03:40 PM Secondhand Upgraded 40W Laser Engraver Cutting Machine Crafts Cutter Engraver 610731105686 | eBay https://www.ebay.com/c/2075025892 12-Jan-20 03:40 PM This is the one I got. It’s a returned one but the brand new is only a little more 12-Jan-20 03:40 PM Hahahaha.. wow somebody was asleep at the wheel on that one! 12-Jan-20 03:40 PM Secondhand 40W CO2 USB Laser Engraving Cutting Machine Engraver Cutter 300x200mm | eBay https://www.ebay.com/itm/Secondhand-40W-CO2-USB-Laser-Engraving-Cutting-Machine-Engraver-Cutter-300x200mm-/254450308497 he is a similar one in a different catagory 12-Jan-20 03:43 PM ah they're US listings 12-Jan-20 03:43 PM Oh... it shows you similar ones 12-Jan-20 03:44 PM @Deleted User https://i.gyazo.com/ef48315840a48f308e67e402e22c808e.png 12-Jan-20 03:44 PM Wow. So unintended consequences of foreign link sending. Product in the wrong category shows related products from said wrong catagory 12-Jan-20 03:44 PM thats what it shows for me 12-Jan-20 03:44 PM what in the world 12-Jan-20 03:44 PM that's a weird glitch 12-Jan-20 03:44 PM but the sellers other items seem to mostly be adult oriented 12-Jan-20 03:45 PM Oh. Sellers list themselves as different names in different categories but are all the same company, and they have multiple warehouses in the US 12-Jan-20 03:46 PM if they didnt take up a decent amount of space i would be seriously considering grabbing one...just do not need more bulky things 12-Jan-20 03:46 PM pretty decent price 12-Jan-20 03:47 PM Yeah. It’s pretty good size 12-Jan-20 05:29 PM @Charles I guess your cutting support/floor must be decently sealed, with the cheapo air exhaust that came with mine, I'd still get smells in my room... and the air would waft around quite a bit, so I got the air assist nozzle (only needs like 5 PSI or something super low) 12-Jan-20 05:29 PM I also upgraded my exhaust to one of these https://www.harborfreight.com/13-gallon-industrial-portable-dust-collector-31810.html 12-Jan-20 05:29 PM in getting that, I also gutted the baffles between the back exhaust port and the cutting stage, to reduce restriction and get more overall flow through all the open holes near the lid/etc 12-Jan-20 06:50 PM I so far playing with over the last few days have not had any problems with exhausting. I cut some wood that of course scorched a bit and made some smoke but the smoke alarm in my house did not go off and the smell did not linger. 12-Jan-20 09:16 PM but you could smell it? 13-Jan-20 02:23 PM Some, and a little more when I opened the lid, but nothing that stuck around for too long. If I were to be using it regularly I would relegate it to the garage. 13-Jan-20 08:38 PM With my huge dust blower, I smell nothing inside 13-Jan-20 10:27 PM ... That first ebay link did not give me a laser cutter 13-Jan-20 10:27 PM Literally copypasting that link gives me a listing for an adult toy. 13-Jan-20 10:27 PM Strange currents in the warp today. 13-Jan-20 10:27 PM But yeah, unfortunate that they don't ship to Finland 13-Jan-20 10:27 PM Friend paid 500eur for his K40 13-Jan-20 10:27 PM And is on his 3rd laser tube 13-Jan-20 10:27 PM @Deleted User https://www.ebay.de/itm/40W-CO2-Laser-Graviermaschine-30-20cm-Schneider-Engraver-Carving-Frasmaschine/273312006195 13-Jan-20 10:27 PM Slightly more expensive, but ships from germany 13-Jan-20 10:32 PM Only ships to Europe 13-Jan-20 10:32 PM but I don't care since I'm getting a much more powerful solid state laser 13-Jan-20 10:32 PM Ah Europäische Union 13-Jan-20 10:32 PM sorry 13-Jan-20 10:32 PM oki 13-Jan-20 11:29 PM @Deleted User I thought you were in the continent of Europe 13-Jan-20 11:32 PM I am, but for a lot of sellers continental europe is not europe 13-Jan-20 11:33 PM Lame 13-Jan-20 11:33 PM I guess that's just politics? 13-Jan-20 11:39 PM Yea 13-Jan-20 11:39 PM European Union and European Economic Area don't cover all of europe. 14-Jan-20 03:44 PM https://i.spirit.re/DKxuS.jpg 14-Jan-20 03:44 PM this final-ish revision of the nixie clock seems to be alive 14-Jan-20 03:44 PM WiFi enabled? 14-Jan-20 03:45 PM wifi+bt 14-Jan-20 03:46 PM I guess you'll write an Android app to control this then? 14-Jan-20 03:46 PM yeah, eventually 14-Jan-20 03:46 PM have to test it for reliability 14-Jan-20 03:46 PM the previous version used similar chips but rated for higher logic supply, and they kept dying after a few hours 14-Jan-20 03:52 PM wifi makes me think of NTP sync and the option to have it do stuff based on triggers from connected services 14-Jan-20 03:53 PM yep, NTP sync is the idea 14-Jan-20 03:53 PM no RTC on board really, so needs corrections 14-Jan-20 03:53 PM I didn't realize some company other than Dalibor Farney has started new production of IN-18 nixies again 14-Jan-20 03:53 PM a Ukrainian company yeah 14-Jan-20 03:54 PM $90 a piece is getting more reasonable 14-Jan-20 03:55 PM considering original in-18s are far more advanced and cost ~$40, meh 14-Jan-20 03:55 PM non-evaporable getter, mercury depositor in the bottom 14-Jan-20 03:57 PM I wish someone will add a bit more diversity to this, perhaps recreate some of the rare Rodan tubes 14-Jan-20 03:57 PM Charles probably could, if you asked hard enough 14-Jan-20 03:57 PM but Rodan tubes are HUGE 14-Jan-20 03:57 PM Not necessarily the big ones, but fine meshed ones 14-Jan-20 03:57 PM oh 14-Jan-20 03:57 PM that I can experiment with 14-Jan-20 03:57 PM I'm almost to the point where I can do nixie glassblowing, with just a few minor issues 14-Jan-20 03:57 PM no oxygen concentrator, the synchronous second axis isn't done yet(waiting for parts), and the turbopump controller still hasn't arrived 14-Jan-20 03:57 PM I want to see whether I can use PCB manufacturing techniques to etch super fine grids 14-Jan-20 04:00 PM Or see how tiny you can practically make the whole thing, the glass blowing part will be a massive challenge though 14-Jan-20 04:00 PM tiny is easier 14-Jan-20 04:00 PM except for the feedthroughs 14-Jan-20 04:01 PM Up to a certain point right? After that you might have issues with stuff touching each other when you are handling them 14-Jan-20 04:01 PM well, you generally make the assembly first 14-Jan-20 04:01 PM then you weld it to a stem containing the feedthroughs 14-Jan-20 04:01 PM and stuff that into the tube 14-Jan-20 04:01 PM so you're not touching anything while you're doing glassblowing 14-Jan-20 04:04 PM I have no experience with glassblowing myself but I would think the smaller you go the higher the chance the feedthrough wires will touch each other 14-Jan-20 04:04 PM as I've learned you basically need a lathe 14-Jan-20 04:04 PM and a dual synchronous axis lathe 14-Jan-20 04:04 PM I'm cheating by making a second axis for my metal lathe, because it's cheaper(if you don't count the $1100 the lathe cost) 14-Jan-20 05:17 PM @Deleted User what lathe do you have and how are you making the 2nd axis? 14-Jan-20 05:19 PM I have this lathe: 14-Jan-20 05:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/jet_bd_7vs_nastolnyy_tokarnyy_stanok_po_me-495E3.png 14-Jan-20 05:19 PM As for the second axis, one moment, I'll explain a neat trick 14-Jan-20 05:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200115_042030-3EC8A.jpg 14-Jan-20 05:19 PM There's this neat addon you can buy 14-Jan-20 05:19 PM Which is essentially a really crappy live center - a chuck in a bearing block, that freely spins 14-Jan-20 05:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200115_042156-CC684.jpg 14-Jan-20 05:19 PM The other end is just a morse taper 14-Jan-20 05:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200115_042348-E7509.jpg 14-Jan-20 05:19 PM There's enough space to put a pulley on the chuck end(once machined with a bigger hole), and to put a servo motor underneath 14-Jan-20 05:19 PM That will connect to a brain box somewhere 14-Jan-20 05:19 PM Which will have a cheap rotary encoder sitting directly on the main shaft 14-Jan-20 05:19 PM So the rotation will be synchronized 14-Jan-20 05:19 PM I will then drill out the tiny chuck's jaws and thread them, to be able to insert pins and other devices to hold larger glass items, since the chuck is way too small for that 14-Jan-20 05:19 PM https://www.ebay.com/itm/Revolving-Center-MT2-MT3-MT4-Shank-3-Jaw-Self-Centering-65mm-Chuck-Lathe-Mount/113781786317 14-Jan-20 05:19 PM This is the chuck thing I bought 14-Jan-20 05:19 PM It's very expensive at over $80, but it's the best I could find off-the-shelf, cheaper deals can probably be had if you search for "revolving center jaw" 14-Jan-20 05:19 PM @samy 14-Jan-20 05:50 PM ahh sweet! 14-Jan-20 07:10 PM https://i.spirit.re/4xLXH.png 14-Jan-20 07:10 PM One little nixie supply made nixies glow 14-Jan-20 07:10 PM Another little nixie supply made a bargraph show 14-Jan-20 07:10 PM This little nixie supply went to hell. 14-Jan-20 07:10 PM This is what I call a minor underspec 14-Jan-20 07:10 PM https://youtu.be/RwE_ALw1rFQ 14-Jan-20 07:10 PM It does work though 15-Jan-20 12:52 AM @Deleted User what do you want a second axis for? is is colinear with the main axis? 15-Jan-20 12:52 AM Yeah, for glasswork 15-Jan-20 12:52 AM Chuck a stem in one end, the tube bulb in the other, set them spinning and start heating 15-Jan-20 12:52 AM You pretty much need a second spindle for any tube making 15-Jan-20 12:53 AM stem meaning? 15-Jan-20 12:53 AM the "knife" to push the molten glass? 15-Jan-20 12:53 AM the bit with all the glass to metal seals 15-Jan-20 12:53 AM https://www.youtube.com/watch?v=wxL4ElboiuA 15-Jan-20 12:54 AM ah 15-Jan-20 12:54 AM this video explains and shows it all 15-Jan-20 12:54 AM very neat watch 15-Jan-20 12:54 AM so you rotate them at the same time, heat, and slowly push them together? 15-Jan-20 12:54 AM mhm! 15-Jan-20 12:54 AM ah 15-Jan-20 12:54 AM hmm 15-Jan-20 12:54 AM real glass lathes use a pinion rod 15-Jan-20 12:54 AM and usually chain drive 15-Jan-20 12:54 AM but I don't want to butcher my lathe 15-Jan-20 12:56 AM very cool 15-Jan-20 07:13 AM I have had discussions via email with Dalibor. You are not seeing a good example of stem making there and he is having problems. I tried to help but he appears to already know everything so I stopped trying. I did wind up brokering a deal to sell him a 16 position Carousel sealing machine. I will snap some pictures of a proper stem pinching head later on. Also unless it has changed he is using Duran glass and not a proper sealing glass and Kovar leads. Yes it will seal but it will not last. Additionally he is not pre beading. The appearance of the seal has bubbles and pits. The only way to produce a non beaded seal with Kovar is to use the proper glass, and to have exacting conditions during the seal and hand torches just cannot do it reliably. A friend of his confided in me that he is having problems and looking for solutions. He showed me some of his tubes. They look beautiful but he really needs to get somebody from schott on the phone and go over a few things. 15-Jan-20 07:22 AM Additionally about lathes the traditional glass lathe uses a spline shaft running behind the bed to sync the heads. Nearly all others do as well. Look at Litton lathes. Far and away the best ones. Heath way and woodland are second. As for receiving tubes bulbs were either lehr blow molded or made on carousel style test tube machines and stems were either pinched or molded. Then most tip less tubes were drop sealed (see my video) or in the case of miniature tubes the bulb was already cut and fire polished they were sealed by the contraction of the melted glass around the button stem and then further heated to fuse. No lathes used in receiving tube production cause all the parts were done on separate machines. Now for large or specialty tube work it was all lathe work. Everything would be made from cut tubing and either blown or shaped down. 15-Jan-20 07:22 AM https://www.youtube.com/watch?v=bns8D9fN5M4&feature=share 15-Jan-20 07:22 AM Oops. I accidentally first put this in General. This is a very stripped down version of drop sealing a T12 bulb and wafer stem 15-Jan-20 07:22 AM Traditionally this was the production means for sealing receiving tubes. I will one day when it warms up in the garage make an in depth video of properly sealing a tube on the horizontal lathe. Also I can show it on a Litton CRT drop sealer and a vertical lathe, but it’s to cold at night when I can do it to have the doors open for the fumes. 15-Jan-20 11:37 AM @Charles that is very neat 15-Jan-20 11:37 AM Is it required to pre-bead the metal? 15-Jan-20 11:37 AM I'm going to try sealing tungsten to borosilicate 15-Jan-20 11:37 AM After cleaning it in molten NaNO2 15-Jan-20 12:09 PM Also, have you ever considered making bar graph nixies? Nixie manufacture is now re-starting(2 or 3 manufacturers now), but nobody has made a bargraph yet! 15-Jan-20 12:10 PM because there is still a billion available from russia 15-Jan-20 12:10 PM that are pretty decent 15-Jan-20 12:10 PM very nice but quite expensive and pretty small 15-Jan-20 12:10 PM it would be really neat to make bargraphs 15-Jan-20 12:10 PM basically there are only like 2 types of russian numerical tubes available anymore and they kinda suck 15-Jan-20 12:11 PM there's like 10 15-Jan-20 12:11 PM a lot of them don't suck 15-Jan-20 12:11 PM in-9 and in-13s are pretty cheap in bulk 15-Jan-20 12:11 PM yep 15-Jan-20 12:11 PM but they will run out too, eventually 15-Jan-20 12:11 PM and I am only counting tubes that are like less than 5 bucks a pop in bulk... 15-Jan-20 12:11 PM not many of those 15-Jan-20 12:12 PM I refuse to pay like 50 bucks a tube... 15-Jan-20 12:12 PM that's what I meant by readily available 15-Jan-20 12:12 PM IN-1s and IN-12s I think they were 15-Jan-20 12:12 PM the cheapest newly manufactured tube is $90 15-Jan-20 12:12 PM yea they are coming down... 15-Jan-20 12:12 PM and it's an IN-18 clone 15-Jan-20 12:12 PM which is available for $40 15-Jan-20 12:12 PM I didn't see that tube though? 15-Jan-20 12:12 PM link or source for that? 15-Jan-20 12:12 PM https://www.youtube.com/watch?v=uHv1f4_tDv4 15-Jan-20 12:12 PM I just knew of the one guy in europe 15-Jan-20 12:13 PM Dalibor makes RZ568M clones 15-Jan-20 12:13 PM very chunky big tubes 15-Jan-20 12:13 PM Millclock make IN-18 clones 15-Jan-20 12:13 PM basically copied the entire process from Dalibor 15-Jan-20 12:13 PM eh I mean that's kinda how it goes 15-Jan-20 12:13 PM I think its great there is drive to re-make these though 15-Jan-20 12:14 PM looks like a DIY glass lathe though, but that's cool 15-Jan-20 12:18 PM honestly if I got the tools and had the time someday I'd like to give a go at making nixies or something similar 15-Jan-20 12:18 PM maybe numitrons, those are rare and not talked about much 15-Jan-20 12:18 PM I'm getting there 15-Jan-20 12:18 PM but I have too many projects currently lol 15-Jan-20 12:18 PM I will be making numitrons first! 15-Jan-20 12:18 PM (because gas is $$$$) 15-Jan-20 12:18 PM ooohhh nice 15-Jan-20 12:18 PM hahaha gas is cheap from welding supply shops here 15-Jan-20 12:19 PM the systems and the right gases are expensive 15-Jan-20 12:19 PM but I personally love incandescent displays 15-Jan-20 12:19 PM sooo nice to look at 15-Jan-20 12:19 PM fair 15-Jan-20 12:19 PM since you need helium, neon, and argon in a perfect mix 15-Jan-20 12:19 PM right... 15-Jan-20 12:19 PM I personally need to buy SF6 for what I want to play with 15-Jan-20 12:19 PM go look up those prices :) 15-Jan-20 12:19 PM simple 15-Jan-20 12:19 PM just get a bucket and raid a local substation 15-Jan-20 12:20 PM pft 15-Jan-20 12:22 PM what sucks about nixie manufacture is you pretty much need all the gear that millclock and dalibor use 15-Jan-20 12:22 PM it's almost identical too 15-Jan-20 12:22 PM glass, stem making, precision spot welding, insulator cutting 15-Jan-20 12:22 PM and you need to buy all the things like getters(good luck without a MOQ), wire, glass 15-Jan-20 12:22 PM oh, there's a third manufacturer by the way! 15-Jan-20 12:22 PM there's a guy in Japan by the name of ArNeo Electronics, @yuna_digick on Twitter, who makes nixies! 15-Jan-20 01:06 PM Yeah looks like he's recreating the black fine meshed electrodes of the old Rodan tubes! 15-Jan-20 01:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/EOFfmzsU0AAy6o6-FBF92.png 15-Jan-20 01:06 PM The idea of using the precise GPS clock is nice too 15-Jan-20 01:14 PM Here's an idea: ITO glass anode 15-Jan-20 01:14 PM zero mesh 15-Jan-20 01:14 PM even coating the actual bulb 15-Jan-20 01:14 PM fully ITO glass nixies... 15-Jan-20 01:14 PM ITO cathodes... 15-Jan-20 02:36 PM All metals must have some adherent layer of oxide to seal to glass. The potassium trick on tungsten does not really work. Inconsistent results. The proper way is to hydrogen reduction fire the area to seal to clean it, then oxidize it evenly. You really need some practice to get it right because flame conditions in oxidizing, beading, and subsequent sealing all effect the final result. Borated dumet in soft glass is actually the easiest seal to make. It’s pre oxidized from the factory and the borate keeps it ready to wet the glass. Now those seals you can just drop the pins in, heat and press the glass, and move on. The only problem is that it is essential to instantly get them into a annealing chamber or they will crack on cooling. 15-Jan-20 02:36 PM I might try a bar graph. If a 8 segment one is useable I could do it with a 9 pin mini stem and bulb. I don’t really have a gas filling manifold suitable for it though, nor do I have the peening mixtures. I would probably need to find a good neon guy to do that part. 15-Jan-20 02:36 PM But then again what’s the fun without the Kr 85? Hahahahaha. There is no sense of danger without it. However I did find out that Linde still can provide it. Where they are getting it from I have no clue but they still have the mixture listed for sale! 15-Jan-20 02:49 PM I've managed to clean the tungsten with NaNO3 perfectly 15-Jan-20 02:49 PM Haven't tested how well it seals yet, but it seems very good 15-Jan-20 02:49 PM I have a spool of untouched and almost-sealed dumet, and some soft glass, but I don't have an annealing oven yet and I really like how borosilicate simply does not care how I torture it 15-Jan-20 02:49 PM my first tungsten seal did crack though, but it's probably because it was a garbage seal and not because of stress 15-Jan-20 04:01 PM The cleaning is not the problem. The surface conditions and how it will allow the oxide layer to form is 15-Jan-20 04:13 PM Hmm, I've been dealing with a seemingly similar issue regarding application of a fluorisilane to nickel metal 15-Jan-20 04:13 PM The silane is essentially the glass in this case, I think, to relate it to the tube stuff 15-Jan-20 04:13 PM It's been super confusing because there's a bajillion oxidation states of the nickel metal 15-Jan-20 04:52 PM <__ice9#6039> For sealing to glass, galinstan can often be an option 15-Jan-20 04:52 PM <__ice9#6039> Oh you mean for melting glass to metal seals hmm 15-Jan-20 04:56 PM I was going to take the tungsten, clean it, then blast it with the torch to red heat to re-grow a proper oxide 15-Jan-20 04:56 PM Not sure if I'd put it in a bead afterwards 15-Jan-20 09:26 PM Trying out something. Two smaller grids. One over each half of the filament. My grid winders can’t really go over half an inch width so I made two. The anode is moly and should be a dark black/blue after sealing. I could use shielding gas while sealing but meh. I like the pretty color it makes without it. 15-Jan-20 09:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-C84C4.jpg 15-Jan-20 09:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-98145.jpg 15-Jan-20 09:28 PM man, having a supply of stems must be neat 15-Jan-20 09:28 PM are there stem manufacturers that you can buy from today? 15-Jan-20 09:36 PM I love that the tube looks really professional and then there's just parts on a dish 16-Jan-20 09:27 AM I was wondering, can you make a nixie dot matrix display? (ignoring the fact that a flat glass would have to be super thick. 16-Jan-20 09:27 AM I mean, horizontal would be the dots, and vertical the grids, for example? 16-Jan-20 09:27 AM Or would they just superimpose so much between dots? 16-Jan-20 09:27 AM (LOL, the thought of individual pins per dot came to my mind...) 16-Jan-20 10:01 AM @Nixie Have you used a plasma display before? Not exactly the same, but a very similar concept. They however usually have insulated electrodes for longevity, use high pressure glow discharges, address discharge cells with high voltages and sustain with low to keep previously addressed cells lit, and use mercury gas or some noble gas UV emitter and a phosphor coating for color. 16-Jan-20 10:10 AM @Nixie Burrough Self Scan display 16-Jan-20 10:10 AM https://i.ytimg.com/vi/D6AdElMxKA8/maxresdefault.jpg 16-Jan-20 10:10 AM work on the principle of neon discharge but are scanned like a decatron is incremented 16-Jan-20 10:11 AM https://www.ebay.com/itm/Rarest-NOS-NIB-NIXIE-MATRIX-screen-100x100-10000-Z568M-/321346505250 16-Jan-20 10:24 AM what's "self scan"? 16-Jan-20 10:30 AM http://ferretronix.com/tech/nixie/self-scan/ 16-Jan-20 10:30 AM have fun reading :P 16-Jan-20 10:30 AM basically there are a few "phases" you cycle through and it ticks over to the next row, then you put on the row data, pulling the cathodes or anodes or whatever they are to potential displaying that row, then you cycle the phases again, so you don't need row multiplexing circuitry 16-Jan-20 10:32 AM ahh, cool 16-Jan-20 10:32 AM because when I googled self scan display I ended up at the wiki about self checkout and the displays used in those machines 16-Jan-20 11:55 AM That bare 100x100 matrix is not worth buying, especially not for $200 16-Jan-20 11:55 AM It's a nightmare to drive 16-Jan-20 11:55 AM https://www.ebay.com/itm/Electronika-MS-6205-1PCS-USED-NIXIE-MATRIX-SCREEN-socket-OTK/263922960687 16-Jan-20 11:55 AM This is the kind you want to buy 16-Jan-20 11:55 AM It has all the drivers in it, and is basically a really huge and really dumb HD44780 16-Jan-20 11:55 AM And the schematics are available 16-Jan-20 11:55 AM https://www.ebay.com/itm/NEW-NIXIE-DISPLAY-Electronika-MS6205-ARDUINO-controlled-TESTED-BOXED-IN18-Z568M/302537767245 16-Jan-20 11:55 AM same thing but NOS 16-Jan-20 11:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/MC6205_programm_and_circuit-62A68.zip 16-Jan-20 11:55 AM here's the schematic and software 16-Jan-20 11:55 AM (beware, I didn't test these, downloaded from a Russian site) 16-Jan-20 12:48 PM wow those have gotten plentiful and cheap 16-Jan-20 12:48 PM I remember when people wanted a lot for the whole thing 16-Jan-20 12:54 PM Someone popped open a fresh Ukrainian warehouse I reckon :) 16-Jan-20 01:16 PM yea lol 16-Jan-20 01:20 PM Wooooooah 16-Jan-20 01:20 PM Thanks for all the shares! 16-Jan-20 06:45 PM Doing a burn-in test of cathode poisoning prevention 16-Jan-20 06:45 PM https://youtu.be/n_D5obRXrw4 16-Jan-20 06:45 PM Oh, nice thumbnail. 16-Jan-20 06:45 PM It looks a lot worse than it actually is - none of the cathodes are on at the same time :P 16-Jan-20 11:10 PM Dimming nixies with PWM works. Quite well, actually. 17-Jan-20 06:31 AM yea, I actually have mine using one decoder and transistor pairs on the anodes for multiplexing and it actually dims them nicely as it is 17-Jan-20 10:34 AM Multiplexing will shorten their life if you're driving them at currents to restore full brightness 17-Jan-20 10:44 AM I am not... My thought was if anything it would extend life. 17-Jan-20 10:44 AM these will be like... kitchen clocks, glanced at every now and again, used for timers 17-Jan-20 10:44 AM Driving nixies at a current higher than around 80% of their rated maximum is going to shorten their life 17-Jan-20 10:44 AM no need to be super bright 17-Jan-20 10:44 AM again 17-Jan-20 10:44 AM I just said I DIDN'T 17-Jan-20 10:45 AM That's good then 17-Jan-20 10:45 AM Just a 1/6 duty reduction in brightness 17-Jan-20 10:45 AM Still plenty bright 17-Jan-20 10:45 AM I am multiplexing them and driving at below original rated current 17-Jan-20 10:45 AM no... 1/4th 17-Jan-20 10:45 AM just a kitchen clock 17-Jan-20 10:45 AM no need for seconds 17-Jan-20 10:45 AM Also, drive them at their rated current 17-Jan-20 10:45 AM So if it's 4-7mA, drive around 5-5.5 17-Jan-20 10:45 AM the point was cheap as possible, making a bunch for family 17-Jan-20 10:45 AM underdriving nixies is also damaging 17-Jan-20 10:45 AM Just an FYI 17-Jan-20 10:45 AM And remember that cathode poisoning prevention is necessary 17-Jan-20 10:46 AM yea I already have that handled 17-Jan-20 10:46 AM all good then 17-Jan-20 10:46 AM those are the only two rules really 17-Jan-20 10:46 AM They are socketed IN-12s anyway 17-Jan-20 10:46 AM cheap and easy to replace 17-Jan-20 10:46 AM all nixies are valuable! 17-Jan-20 10:46 AM :P 17-Jan-20 10:47 AM heh, all things die eventually 17-Jan-20 10:47 AM if driven correctly, they will be expensive to replace by the time they die 17-Jan-20 02:24 PM Also got a new toy today 17-Jan-20 02:24 PM https://media.discordapp.net/attachments/499873492477411339/667848577942290452/DSC_2935.JPG 17-Jan-20 02:24 PM woot 17-Jan-20 02:26 PM yea 400 bucks shipped vs 850 for what the MSRP was on it 17-Jan-20 02:26 PM Arrow had remaining stock on sale 17-Jan-20 02:26 PM which was two when I got to it and none now 17-Jan-20 02:37 PM Gotta hack it to full options 17-Jan-20 02:50 PM I will once I have a j-link in hand 17-Jan-20 02:50 PM didn't have a jtag on hand I don't think anyway 17-Jan-20 02:50 PM isn't it doable over ethernet or something? 17-Jan-20 02:50 PM no... 17-Jan-20 02:50 PM the MSO1074Z-S needs to do a firmware dump over jtag 17-Jan-20 02:50 PM https://www.mikrocontroller.net/topic/394598 17-Jan-20 02:51 PM ah, looks like it 17-Jan-20 02:51 PM about half way down the page 17-Jan-20 02:51 PM ouch 17-Jan-20 02:51 PM or https://www.youtube.com/watch?v=OvcGn_ScG5w 17-Jan-20 02:51 PM either way... the warrenty void sticker can be avoided and well even if I fuck it up they are illegal in the US 17-Jan-20 02:51 PM get a segger j-link clone 17-Jan-20 02:51 PM so I can force them to take my warrenty claim if I have a problem 17-Jan-20 02:51 PM I did 17-Jan-20 02:51 PM its on the slow boat 17-Jan-20 02:52 PM when you get it, whatever you do, do NOT use the official firmware upgrade option 17-Jan-20 02:52 PM (for obvious reasons) 17-Jan-20 02:52 PM it will nag you and it's easy to accidently say yes 17-Jan-20 02:52 PM hm? 17-Jan-20 02:52 PM like if you hook it to a PC or something? 17-Jan-20 02:53 PM the clones get insta-bricked if you upgrade them with official j-link firmware 17-Jan-20 02:53 PM oh oh 17-Jan-20 02:53 PM the j-link 17-Jan-20 02:53 PM haha figures 17-Jan-20 02:53 PM yeah 17-Jan-20 02:53 PM good to know thanks 17-Jan-20 02:53 PM also going to replace the intensity knob 17-Jan-20 02:53 PM I wish more oscopes had tactile encoders 17-Jan-20 02:54 PM they used them on the scales... 17-Jan-20 02:54 PM not on the intensity? which I dunno why it has that name its purely used for going through menus it looks like 17-Jan-20 02:54 PM most of the knobs on mine are flappy, only the time div and voltage scales are tactile 17-Jan-20 02:54 PM also its an LCD... not a tube scope wth? 17-Jan-20 02:54 PM it's a digital phosphor emulation 17-Jan-20 02:54 PM very useful 17-Jan-20 02:54 PM so intensity is not a faff 17-Jan-20 02:54 PM most higher end scopes come with their own version of it 17-Jan-20 02:54 PM tek's DPO, etc. 17-Jan-20 02:55 PM ah hrm 17-Jan-20 02:55 PM either way you use it to go through the menus 90% of the time and well 17-Jan-20 02:55 PM with no indents it sucks 17-Jan-20 02:55 PM you just kinda scroll until your on the thing then when you click it in to select you accidentally go to the next thing... 17-Jan-20 02:55 PM I dunno what they were thinking 17-Jan-20 02:56 PM %insert any manufacturer% does this 17-Jan-20 02:56 PM and I don't know why either 17-Jan-20 02:56 PM its fine 17-Jan-20 02:56 PM https://www.newark.com/alps/ec12e2424407/encoder-incremental-5vdc/dp/74M1068 17-Jan-20 02:56 PM I can replace it 17-Jan-20 02:56 PM :P 17-Jan-20 02:56 PM my hantek is the same - funnily enough it came pre-hacked from the factory 17-Jan-20 02:56 PM and I don't mean as an upgraded version - it's the lowest end model with the highest end features 17-Jan-20 02:58 PM lol 17-Jan-20 04:08 PM there are likely other issues with the firmware than what's out there if you're trying to find an easier upgrade path - i would see if anyone has published the firmware for it 17-Jan-20 04:10 PM huh no? 17-Jan-20 04:10 PM I mean there is a video on cracking the stuff 17-Jan-20 04:10 PM not a big deal, though I am going to email Rigol first 17-Jan-20 04:11 PM just noting if you didn't want to open it up 17-Jan-20 04:11 PM because most other places were shipping them with all the codes for free... so its possible they are running some promotion that Arrow didn't care to share about 17-Jan-20 04:11 PM happy to help if there is a dump of the fs published somewhere 17-Jan-20 04:11 PM ahh 17-Jan-20 04:11 PM so I am going to send a nice enquiry and see if they will be friendly 17-Jan-20 04:11 PM cool 17-Jan-20 04:12 PM no FS, its a rom dump over JTAG... I don't think there is FS on there anyway, its like you tell it to give you a rom address range and get that data 17-Jan-20 04:12 PM if I get an image though I can give it to you 17-Jan-20 04:13 PM really? i recently got mso5000, there was no hack for my version of fw but found an older fs dump online and was able to make a patch to enable ssh and then patch appEntry (the frontend app) 17-Jan-20 04:15 PM Yea I don't think the 1074 is *nix based? the 5000 is the first one they used their own asics in 17-Jan-20 04:15 PM but maybe dunno 17-Jan-20 04:15 PM hmm they don't explicitly list MSO1000Z here, guessing DS1000Z would be the same? https://www.rigolna.com/firmware/ 17-Jan-20 04:15 PM ah yeah that's it 17-Jan-20 04:15 PM "[Supported Model] All the MSO/DS1000Z Series Digital Oscilloscopes" 17-Jan-20 04:19 PM yea DS1000 17-Jan-20 04:19 PM there is an entire thread on hacking these units though 17-Jan-20 04:19 PM https://www.eevblog.com/forum/testgear/sniffing-the-rigol_s-internal-i2c-bus/msg1479265/#msg1479265 17-Jan-20 04:25 PM ah nice 17-Jan-20 05:40 PM @Deleted User The sgeer clone detector got updated? As I did succesfully upgrade of mine like a year ago. 17-Jan-20 05:40 PM I DID replace it's serial with something unique 17-Jan-20 05:41 PM there are third party firmwares that still work afaik 17-Jan-20 05:41 PM Yeah I originally installed a hex edited alternative firmware, changed serial and then upgraded. 17-Jan-20 05:42 PM that will probably work 17-Jan-20 05:43 PM because the hexedited one was ancient 19-Jan-20 10:44 AM found a stack of these in the uni ewaste. 19-Jan-20 10:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/P1010161-B4287.png 19-Jan-20 01:45 PM Nice looking cases and faceplates. Lots of jacks for project type use. I would snag a couple for future projects and parts harvesting if they were just gonna wind up in the bin anyways. 19-Jan-20 03:55 PM Already did that to a bunch of em 19-Jan-20 03:55 PM Some nice fast opamps and comparators in there as well 22-Jan-20 10:58 AM so glad I decided to tear down this turbo. It had evidently sat without being purged or flushed and I discovered totally-solidified gunk in the oil passage just before the 2nd/vacuum-side bearing 22-Jan-20 11:22 AM that would definitely have killed your hard work replacing the bearing 22-Jan-20 02:57 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200122_165707-A8F6E.jpg 22-Jan-20 02:57 PM Before and after 22-Jan-20 02:57 PM stator? 22-Jan-20 02:58 PM Yea 22-Jan-20 02:58 PM very chunky 22-Jan-20 02:58 PM Topmost one. 22-Jan-20 07:15 PM https://youtu.be/1ryurf7JOmo 22-Jan-20 07:15 PM I've managed to cram all three features into it without crushing the CPU 22-Jan-20 07:15 PM Global PWM dimming, per-tube bit angle modulation dimming, and per-tube crossfading between two states(previous and new) 22-Jan-20 07:15 PM Global is 11 bit, per-tube is 7 bit each 23-Jan-20 12:45 PM sweet cross fading 23-Jan-20 12:46 PM Will eventually be opensource 23-Jan-20 12:46 PM Cheap to build, only an ESP32, 3 chips, and a power supply 24-Jan-20 03:14 PM https://media.discordapp.net/attachments/424014648757452800/670405700987387904/829843668229403669.jpg https://media.discordapp.net/attachments/424014648757452800/670405701662801920/8957410484940598908.jpg https://media.discordapp.net/attachments/424014648757452800/670405702933807134/-2893819854691219366.jpg https://media.discordapp.net/attachments/424014648757452800/670405703168425997/3078876390647734084.jpg 24-Jan-20 03:14 PM Anyone have a rough idea what this photo multiplier tube might be for?? Guy who I bought conflat from in the past near me sent me this and asked if I had any idea. 24-Jan-20 03:15 PM see if the output is AC coupled 24-Jan-20 03:15 PM if it's DC it's from some sort of optical spectrometer / brightness detector 24-Jan-20 03:15 PM if it's AC it's for some counting thingy, 'prolly with a scintillator 24-Jan-20 03:16 PM I dunno if he is that technically inclined. He just sells this stuff as he gets it from friends so. Hrm. 24-Jan-20 03:16 PM https://www.ebay.com/sch/surplus2012/m.html?_nkw=&_armrs=1&_ipg=&_from= 24-Jan-20 03:16 PM this guy 24-Jan-20 03:16 PM he generally always has good prices on bits and bobs 24-Jan-20 03:19 PM some nice stuff he's got there 24-Jan-20 03:19 PM yea, he ussually does have decent stuff. 24-Jan-20 03:19 PM He is also a pretty nice guy, I once went over and just picked stuff out and made a bulk purchase (shhh don't tell ePay) and yea that was a good experience. 24-Jan-20 03:19 PM I just told him to post it as a photo multiplier tube, I mean he probably won't post it for a ton of money he is super reasonable, probably worth someone's gamble :) 25-Jan-20 01:53 AM A bit janky shipping on these vacuum valves.. they didn't even use any tape on the bubble wrap 25-Jan-20 01:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20200125_015224-B71F6.jpg 25-Jan-20 09:40 AM that is how my 901P sensors got shipped...big contrast to the guy i got my valves from where they were in 3 layers of plastic. thankfully everything survived 25-Jan-20 09:40 AM how are the sealing surfaces? 25-Jan-20 09:54 AM <__ice9#6039> Nothing fancy, but this is definitely the simplest and cheapest way I know for running deuterium lamps 25-Jan-20 09:54 AM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200125_115051-7CB79.jpg 25-Jan-20 09:54 AM <__ice9#6039> As an added benefit, it even works on ones with dead filaments 25-Jan-20 09:58 AM @LRM one of the edges looks nicked, but it seems to be outside of the gasket o-ring area so should be fine... I didn't actually check the second valve 25-Jan-20 10:01 AM <__ice9#6039> These ballasts are available off the shelf in e.g. 35W/55W/75W/100W/150W output power levels, all for <$20 -- much cheaper than dedicated deuterium lamp power supplies and less of a hassle than building one. 25-Jan-20 10:09 AM Huh, nice, I've got two deuterium lamps from some surplus air quality testers 25-Jan-20 10:10 AM That's a great tip. I'll have to remember that 25-Jan-20 10:10 AM They likely have supplies in them, but i was not sure about the requirements to turn them on using those inbuilt supplies 25-Jan-20 10:14 AM <__ice9#6039> They're a particularly nice source of broad-spectrum UV -- much more balanced than high pressure mercury arc lamps, which are in turn more balanced than low pressure mercury lamps (which are pretty much just 253nm and 185nm-- though the latter is only present with UV-grade quartz envelopes and produces ozone if released) 25-Jan-20 10:14 AM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/450px-Deuterium_lamp_1_1-A62B5.png 25-Jan-20 10:14 AM <__ice9#6039> This image underreports below ~250nm due to limitations of the instrument. Given a good quality quartz envelope, coverage is a bit better than indicated at the low end here. 25-Jan-20 10:29 AM I've been interested in them for DNA quantification/purity check purposes, as that usually uses a ratio of transmission at 260 and 280nm 27-Jan-20 06:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200127_150611-3F8FD.jpg 27-Jan-20 06:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200126_193109-46A1A.jpg 27-Jan-20 06:20 AM Made another dewar pumping adapter for a friend of mine 27-Jan-20 06:20 AM bit bigger dewar 27-Jan-20 07:59 AM nice 27-Jan-20 11:32 AM nice! are the KF flanges screwed in or welded in or something else? 27-Jan-20 11:45 AM glued, normal 2k epoxy 27-Jan-20 02:57 PM cool 28-Jan-20 07:50 AM 4.5" PVC to KF50 gore 28-Jan-20 07:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_0251_copy-54850.JPG 28-Jan-20 08:43 AM WIP photo 28-Jan-20 08:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-F4D00.jpg 28-Jan-20 10:00 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200128_175300-9CAC7.jpg 28-Jan-20 10:00 AM repurposed the old stand of my first vacuum chamber 28-Jan-20 10:06 AM ohh 28-Jan-20 10:18 PM https://twitter.com/profanegeometry/status/1222266520685834241 28-Jan-20 10:18 PM this adorkable nim module has completely destroyed my notifications on twitter 28-Jan-20 10:35 PM thats very low tech 28-Jan-20 10:35 PM haha 28-Jan-20 11:46 PM @LRM I one saw optical fiber polarization rotator... Which just mechanically twists the fiber when you turn the knob 29-Jan-20 12:59 AM yeah that's the way such stuff is implemented 29-Jan-20 12:59 AM and PM fiber stuff is awesome 29-Jan-20 12:59 AM and it's awesome that many lab stuff it pretty simple to DIY 29-Jan-20 12:59 AM what most lab equip manufacturers don't want you to know 29-Jan-20 07:11 AM The nice thing about those delay lines is jitter 29-Jan-20 07:11 AM You have to get a very good digital one to be comparable 29-Jan-20 07:27 AM ehehe 29-Jan-20 07:27 AM like impossible good 29-Jan-20 07:27 AM the only way would be doin the signal processing completely in the digital domain 29-Jan-20 07:27 AM and having an appropriate fast and deep adc 29-Jan-20 07:27 AM (those delays are not only for simple trigger signals of course) 29-Jan-20 08:23 AM Eh you still get problems on the ns scale for short pulses 29-Jan-20 08:23 AM Ringing and stuff gets worse wth length 29-Jan-20 08:23 AM So not so much jitter but whatever you’re triggering or measuring will have some extra interferency mess 29-Jan-20 08:51 AM you mean in analog delays? 29-Jan-20 08:51 AM yeah depending by the line and stuff you've dispersion and impedances have to be matched - as always 29-Jan-20 08:51 AM I mean those problems are always there 29-Jan-20 08:51 AM but if the signals are to fast for your adc you have no alternative, right? 29-Jan-20 08:51 AM and of course I would measure the S- or X-parameters for the delay paths 29-Jan-20 08:51 AM and deal with them depending on what I'm trying to do 29-Jan-20 08:51 AM just wanted to say that sometimes there are no alternatives to analog delays because there is always the case where the fastest adc on earth is not enough 29-Jan-20 08:51 AM so it makes sense to build elaborated (thermostatic ... low dispersion ...) delay lines 29-Jan-20 08:51 AM right right right? 29-Jan-20 08:51 AM I guess that's what you telling me, right? 29-Jan-20 08:51 AM the universal cure against adc jitter and ringing etc is always increasing the samplerate btw 29-Jan-20 09:34 AM sounds ultimative 29-Jan-20 09:34 AM a cure I mean 29-Jan-20 10:29 AM Or slowing down the signal 29-Jan-20 10:29 AM Boxcar integrators and signal gating 29-Jan-20 08:58 PM yeah reminds me not having a decent realtime scope 29-Jan-20 08:59 PM My lab got a grant for a 100k one and then just borrowed one from down the hall 29-Jan-20 09:05 PM and now you've two? 29-Jan-20 09:05 PM or one at home? :> 29-Jan-20 09:09 PM We just spent it on other stuff 29-Jan-20 10:09 PM eheheh 'other stuff' 29-Jan-20 10:54 PM The scope was just to measure the ringing in a circuit that was driven by thz oscillations from a laser-induced signal 29-Jan-20 10:54 PM Plenty of other expensive stuff to buy! 30-Jan-20 06:50 AM Cool 30-Jan-20 06:50 AM My todo list has a signal generator made from two DWDM telecom lasers, a powerdivider to combine them and then a receiving diode to mix them to produce RF 30-Jan-20 06:50 AM As most telco lasers tune one or two ITU channels 30-Jan-20 06:50 AM and them being 25GHz to 100GHz depending on the age of the system that's plenty of deltaF 30-Jan-20 06:50 AM And many of the old 10gigabit linecards my junkbox has seem to have 20GHz or 40GHz receive bandwidth diodes too! 30-Jan-20 11:11 AM yeah those beat frequency autocorrelation analysis over one light pass through a delay (fiber spool) is the easiest way to measure the actual line width 30-Jan-20 11:11 AM and yeah you can use 3dB power dividers or more anoying 50% mirrors 30-Jan-20 11:11 AM ok you don't need exactly 3dB/50% 30-Jan-20 11:26 AM like you can build OSA with variable delays 30-Jan-20 11:26 AM using the wiener-khinchin theorem 30-Jan-20 11:26 AM like fourier transform of the autocorrelation is the power spectrum, right? 30-Jan-20 11:26 AM ok if you have highfinesse turnkey fizeaus on your desk it's maybe unimportant 30-Jan-20 12:11 PM eh just have written what came into mind 30-Jan-20 02:02 PM Yeah the plan is to use a 3dB power divider, as I should have some in the telco junk 30-Jan-20 02:02 PM I recall finding datasheets for at least one of them 30-Jan-20 02:02 PM So hopefully not some weird one with uneven split for feeding some to a detector diode for output monitoring 30-Jan-20 02:02 PM There's also some MEMS attenuators there, so having one of those inline with one of the lasers or the divider output should allow for adding AM modulation to the generator. 30-Jan-20 03:44 PM Well an inkjet printhead is pretty boring in the FIB 30-Jan-20 03:44 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20200130_154332-83F0B.jpg 30-Jan-20 03:44 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20200130_154509-7CD36.jpg 30-Jan-20 03:45 PM you want an epson consumer piezo inkjet 30-Jan-20 03:45 PM they're glued and hard to take apart without destroying the piezo forest, but if you're able, it's really cool 30-Jan-20 04:25 PM Ah, good to know a brand to look for at the thrift store 30-Jan-20 08:20 PM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200130_221512-EA088.jpg 30-Jan-20 08:20 PM <__ice9#6039> 125V SiC igniter element mounted in ceramic terminal block, running on a 220V SCR controller. One could probably improvise a decent miniature vacuum furnace with a few of these. 30-Jan-20 08:22 PM igniter element? 30-Jan-20 08:22 PM hm 30-Jan-20 08:22 PM <__ice9#6039> It's like a pilot light 30-Jan-20 08:22 PM for furnaces? 30-Jan-20 08:22 PM <__ice9#6039> Yeah 30-Jan-20 08:22 PM interesting 30-Jan-20 08:22 PM <__ice9#6039> They are really cheap 30-Jan-20 08:22 PM <__ice9#6039> Like <$20 30-Jan-20 08:22 PM <__ice9#6039> Basically little mini globar heaters 30-Jan-20 08:23 PM I'm about to do a bit of spec finding for my upcoming glass annealing furnace... that would probably double as an smd reflow oven 30-Jan-20 08:23 PM will look into those for power, maybe 30-Jan-20 08:29 PM <__ice9#6039> In air they should only run to about 1600C, but in vacuum... the melting point is 2730C, but evaporation becomes an issue sooner than that 30-Jan-20 08:29 PM I don't expect to bring it up past 700 30-Jan-20 08:29 PM <__ice9#6039> Anyway if you just want to anneal glassware, use Kanthal-A1 30-Jan-20 08:29 PM since most glass goes droopy at that temp, and most ICs evaporate :P 30-Jan-20 08:30 PM <__ice9#6039> Yeah just use Kanthal-- like the element shown wrapped around that cylindrical furnace I had it resting in, in the photo above 30-Jan-20 08:30 PM <__ice9#6039> You can get a 3000W 220V Kanthal element (good to 1450C element temp, melts at 1500C, so maybe 1350-1400C chamber temp) for <$10. I have a bag of them in various sizes. Or you can wind your own coil if you want, but it's usually more convenient to just use these ones 30-Jan-20 08:34 PM don't think I can get one locally, will have to wind my own 30-Jan-20 08:34 PM but that's not hard 30-Jan-20 08:34 PM <__ice9#6039> Amazon 30-Jan-20 08:34 PM amazon don't do belarus :P 30-Jan-20 08:34 PM <__ice9#6039> Also eBay 30-Jan-20 08:34 PM <__ice9#6039> Oh hahaha 30-Jan-20 08:34 PM <__ice9#6039> True true 30-Jan-20 08:34 PM thankfully we have a pandemic of vapers here so kanthal is cheap 30-Jan-20 08:34 PM cents per meter 30-Jan-20 08:35 PM <__ice9#6039> Yes 30-Jan-20 08:35 PM I also don't want something super powerful, I'm going to be aiming at around 1-1.5kW 30-Jan-20 08:35 PM I don't trust the wiring in this old building to take more than that continuously and I don't want to put it in the kitchen next to the 35A plug 30-Jan-20 08:36 PM <__ice9#6039> I built my fume hood out of a grower tent and ducted ventilation fans and carbon filters (+some custom modules), and every time I search for glassware on eBay it keeps recommending the smoking kind, so yeah the vapers making Kanthal cheap is just another example 30-Jan-20 08:37 PM what kind of thickness should I be looking for at this power rating? 30-Jan-20 08:37 PM <__ice9#6039> Don't load it with more than about 12W/cm². You can figure out everything from that. 30-Jan-20 08:37 PM I'm going to build a mini-sized oven, maybe 180x150x120 30-Jan-20 08:37 PM <__ice9#6039> 1500W should be adequate then if you insulate it with some Kaowool 30-Jan-20 08:37 PM <__ice9#6039> https://dcknives.blogspot.com/p/winding-kanthal-a1-element-for-an.html?m=1 30-Jan-20 08:38 PM is it unreasonable to stuff a bunch of cerwool into a toaster and expect 900C max operating temp? 30-Jan-20 08:38 PM <__ice9#6039> That's actually totally reasonable 30-Jan-20 08:39 PM I just don't want to burn the apartment down 30-Jan-20 08:39 PM <__ice9#6039> Most of my furnaces are made of stockpots full of various flavors of ceramic wool and refractory castables 30-Jan-20 08:39 PM <__ice9#6039> Except my tube furnace and my large rectangular one made of bricks 30-Jan-20 08:39 PM <__ice9#6039> I'm about to make an argon graphite furnace targeting at least 2600C in yet another stockpot, except this time it's a fairly huge one. Though not as big as my 160L vacuum chamber 30-Jan-20 08:39 PM <__ice9#6039> My flask furnace is a stockpot with castable in the bottom and Kaowool on the inside walls and a mixing bowl full of Kaowool on top with a hole in the middle for a flask neck. Contains a quartz long necked glass flask with a cone fitting instead of a socket (quartz expands less than borosilicate when hot) that can be used to make SO3 from NaHSO4 at 800C. 30-Jan-20 08:39 PM <__ice9#6039> My fluidized sand bath is a paint can sitting on a firebrick wrapped in Kaowool sitting inside an enameled roaster stockpot, containing an air inlet under a 5" diameter alumina frit aquarium bubbler stone, under a heating element which is under some quartz chips, filled with alumina sand. When you open the valve it looks like boiling mud, but it's just alumina and can go to at least 500C for heating stuff uniformly and efficiently 30-Jan-20 08:46 PM I'm already dreading the bakeout smells that will be coming from this thing 30-Jan-20 08:46 PM but it looks like I don't even need to buy any kanthal 30-Jan-20 08:46 PM regular toaster heaters can get to above 700C! 30-Jan-20 08:47 PM <__ice9#6039> The furnace that SiC element was sitting in, in the photo, is for carbonization. It has an extra wide chamber, a close fitting lid, an argon inlet, an exhaust port, and a blower that Venturi extracts the exhaust and mixes it with air and then runs it through a heat gun element and into a catalytic converter 30-Jan-20 08:47 PM <__ice9#6039> Yeah they are usually just nichrome wire in metal tubes filled with magnesia 30-Jan-20 08:47 PM <__ice9#6039> The carbonization furnace is being constructed (in progress) to turn rayon felt into carbon felt, phenol-formaldehyde castings into glassy carbon crucibles and electrodes and heating elements, bread into carbon foam panels (ironically very pure), etc 30-Jan-20 08:47 PM <__ice9#6039> For the graphite furnace mostly 30-Jan-20 08:47 PM <__ice9#6039> Insulation for the flask furnace is iirc 2.5 inches thick or so 30-Jan-20 08:47 PM <__ice9#6039> The sand bath is about 2 inches 30-Jan-20 08:47 PM <__ice9#6039> It gets hotter than is normal for furnaces on the outside, though, because it is optimized for rapid internal mixing and heat transfer and some of that makes it to the walls. 30-Jan-20 08:47 PM <__ice9#6039> Normally 500C does not need that much insulation, though it depends on how hot you are comfortable with the walls becoming 30-Jan-20 08:47 PM <__ice9#6039> The carbonization furnace will be about 3 inches on the walls and 5 on the bottom 30-Jan-20 08:47 PM <__ice9#6039> The argon graphite furnace will be using graphite felt+blocks instead of Kaowool and porous castable, but should end up about 5-6 inches thick to the walls and 7 or so on the bottom. 30-Jan-20 08:47 PM <__ice9#6039> Empirically, a decent rule of thumb is an inch of Kaowool is good for about 500-700C thermal gradient, but it depends slightly on where your heating elements are located (if embedded in the walls then obviously those parts get a lot hotter) and also depends on how you want to cool your outer chamber wall 30-Jan-20 08:47 PM <__ice9#6039> If you are ok with letting it hit 150-250C and do passive convection, then that estimate for insulation is ok 30-Jan-20 08:47 PM <__ice9#6039> But e.g. my tube furnace has about 6 inches of insulation, and at 1100C internal temperature the outside is only about as hot as a dog 30-Jan-20 08:47 PM <__ice9#6039> So it depends what you want 30-Jan-20 09:01 PM I don't want the outside temp to reach over 60Cish 30-Jan-20 09:01 PM <__ice9#6039> Then you need a bigger container hmm 30-Jan-20 09:01 PM <__ice9#6039> And a lot more Kaowool 30-Jan-20 09:01 PM I was considering making multiple ovens, one for just nixies, out of a tin can 30-Jan-20 09:01 PM maybe 40mm internal diameter + space for kanthal, very large outer diameter 30-Jan-20 09:01 PM 200mm or so 30-Jan-20 09:01 PM all wool 30-Jan-20 09:02 PM <__ice9#6039> You can also wrap the Kaowool around the outside if you protect it with some rigidizing solution and maybe wire mesh 30-Jan-20 09:02 PM <__ice9#6039> Stainless steel 304 service temperature limit is about 930C 30-Jan-20 09:02 PM <__ice9#6039> Don't heat up galvanized or chrome plated steel beyond a few hundred C though 30-Jan-20 09:03 PM I think I'll be happy with a maximum temp of 700 30-Jan-20 09:03 PM <__ice9#6039> And aluminum loses most of its strength below 500C 30-Jan-20 09:03 PM <__ice9#6039> So like in the interests of minimizing vapor leakage, the carbonization furnace only has 1 inch of Kaowool inside the steel, and another 2 inches outside of it, so that the lid can be made to fit more tightly 30-Jan-20 09:03 PM <__ice9#6039> Organic pyrolysis fumes generated during carbonization can be pretty nasty 30-Jan-20 09:03 PM <__ice9#6039> But you only need about 1000-1200C for carbonization 30-Jan-20 09:22 PM <__ice9#6039> In terms of insulation and outer surface temperature, an equivalent statement is: the average dissipated power from the heating elements while maintaining the maximum service temperature will ultimately also be conducted through the outer walls. Better insulation means you need a lower duty cycle on the elements to maintain stable operating temperatures, so the outer walls are cooler. 30-Jan-20 09:22 PM <__ice9#6039> Vacuum furnaces and high temp argon furnaces often outright water cool the walls so that they can get away with using less insulation, particularly for all-metal-hot-zone furnaces, because tungsten sheets are quite costly and radiative insulation requires wrapping the entire wall surface area 3-6+ times in them 30-Jan-20 10:59 PM https://youtu.be/OnsLVmQt43s 30-Jan-20 10:59 PM This, this is why I want a modern non-soviet vacuum pump. 30-Jan-20 10:59 PM As far as I know, this is it running at its quietest. 30-Jan-20 10:59 PM Black knob is ballast, shiny thing is vent. 30-Jan-20 10:59 PM Side note: The toilet paper roll is a really effective way to silence it. 30-Jan-20 11:14 PM <__ice9#6039> Yeah usually the intake tubes of air compressors and exhaust tubes of vacuum pumps are the source of the majority of the noise 30-Jan-20 11:15 PM But, see, it's loud even with the improvised muffler 30-Jan-20 11:15 PM Compared to pumps squirrel has for example 30-Jan-20 11:15 PM Those appear to be near silent on video 30-Jan-20 11:15 PM yeah the D2.5E pumps are very quiet 30-Jan-20 11:16 PM <__ice9#6039> Sure, I merely said the majority-- and in terms of all noise produced by the specific pump in question, not relative to other different pumps 30-Jan-20 11:16 PM yours does not sound deafeningly loud but about on par with most HVAC pumps i have seen 30-Jan-20 11:16 PM I've yet to measure this one properly, but it seems to be fully functional even on old oil - got below 10 mbar 30-Jan-20 11:16 PM It's a scientific/industrial pump, since the HVAC industry was not exactly a thing in this part of the world when this pump was manufactured 30-Jan-20 11:16 PM I think it should go down to around -2 with a good seal and good dry oil 30-Jan-20 11:18 PM yeah just was using that as a reference because most of the pumps in the USA are either hvac or industrial ones with a tiny sliver of nicer ones 30-Jan-20 11:18 PM The D2.5E is what I really want, but there are basically none here 30-Jan-20 11:19 PM my eBay score on those came after a couple very not good pump experiences lol 30-Jan-20 11:19 PM Closest I can find is an Alcatel Pascal 2005 SD for $220... in a pawn shop, somewhere in the nethers of Russia 30-Jan-20 11:19 PM which I think I could haggle down to $150ish, but I don't know how loud they are 30-Jan-20 11:19 PM got one pump home that was a nice old welch three stage rotary (not two... three!) 30-Jan-20 11:19 PM but then when changing out the oil i discovered it had a bunch of mercury in it 30-Jan-20 11:19 PM sooooooo back to the seller it went 30-Jan-20 11:20 PM mercury adds character 30-Jan-20 11:20 PM genuine vacuum tube pump! lol 30-Jan-20 11:20 PM yeah haha 30-Jan-20 11:20 PM this one was apparently used by boeing for whatever boeing was doing in the 50s/60s/70s in Huntington Beach California 30-Jan-20 11:20 PM probably backing mercury diffusion pumps based on the mercury 30-Jan-20 11:20 PM anyway just be careful with the second hand stuff is the point i am trying to make 30-Jan-20 11:22 PM this one, I've been told, was used for modelmaking by the previous owner, and he changed the oil 30-Jan-20 11:22 PM so... horrible epoxy abuse, but nothing mercury related 30-Jan-20 11:22 PM vacuforming? 30-Jan-20 11:22 PM no idea, but probably 30-Jan-20 11:22 PM if you are lucky maybe no epoxy at all 30-Jan-20 11:22 PM well that would be inaccurate, because I did suck some epoxy down 30-Jan-20 11:22 PM (bubbles) 30-Jan-20 11:22 PM actually, I think I only ever sucked platinum silicone, so that shouldn't really be an issue 30-Jan-20 11:24 PM oh that stuff is really nice to work with, probably not a complete nightmare to fix 30-Jan-20 11:25 PM well, it didn't go into the pump 31-Jan-20 12:06 AM Oh wow, I think I found the new king of quiet vacuum 31-Jan-20 12:06 AM The Ulvac GLD pumps 31-Jan-20 12:06 AM There's a few odd videos on youtube showing them, and just... wow 31-Jan-20 12:06 AM Can barely hear it! 31-Jan-20 12:06 AM Want. Now. Right now. 31-Jan-20 07:12 AM so what's the purpose of a scroll pump ballast? I am unsure if my alcatel pascal has one 31-Jan-20 07:12 AM or my little welch gem 31-Jan-20 07:15 AM FYI the Edwards pumps all seem just as loud Spirit 31-Jan-20 07:17 AM yea I mean for a rotary vane pump some are just that loud... 31-Jan-20 07:40 AM oh, gas ballast just means leak valve into the compression side of the vac pump 31-Jan-20 07:40 AM "The gas ballast flow helps to ‘dilute’the vapour inside the pumping mechanism, preventing forexample water vapour from condensing as it is compressedup to atmospheric pressure." 31-Jan-20 08:15 AM <__ice9#6039> Rotary pumps seem a lot happier if you stick a fan on them. Probably improves service life a bit. 31-Jan-20 08:15 AM <__ice9#6039> Yeah gas ballasts are helpful when dealing with condensible vapors or nasty process gases 31-Jan-20 08:23 AM I’ve never seen them with a fan 31-Jan-20 08:37 AM only with the one integrated in the motor 31-Jan-20 08:54 AM Most roughing pumps I have opened are nice and rusty inside on any bare steel. So yea... probably from not dealing with vapors well and that sits around in a hot cavity and probably accelerates corrosion. 31-Jan-20 09:47 AM <__ice9#6039> My Chinese 1-stage rotary pump would routinely reach >60C, though running surprisingly quietly. With a fan it stays near room temperature. My Varian SD-250 2-stage rotary pump could reach about 40C, but again with a fan it stays near room temperature. My oil-free quiet air compressor would reach >85C without a fan, but only about 40C with one. 31-Jan-20 09:47 AM <__ice9#6039> The Varian is obviously the best one of the list, but I still want to take proper care of it. 01-Feb-20 09:47 AM High gas loads heat up mechanical pumps quite a bit. While maintaining vacuum they just pretty much are free wheeling. Less friction, bearings, motor heat, etc, but for the most part a excessively hot pump may be a sign of a leak somewhere. 01-Feb-20 10:02 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200201_190115-891EF.jpg 01-Feb-20 10:02 AM that's how you evacuate a dewar, right? 01-Feb-20 04:47 PM <__ice9#6039> steel wool burning in the output from the pressure swing adsorption oxygen concentrator I built 01-Feb-20 04:47 PM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/1580604402828-9AA44.png 01-Feb-20 04:48 PM congrats! 01-Feb-20 04:49 PM That's neat! 01-Feb-20 04:49 PM How expensive/complicated was it? 01-Feb-20 04:50 PM where did you end up sourcing the sieves from is my main question 01-Feb-20 04:51 PM And which ones 01-Feb-20 04:52 PM <__ice9#6039> Looks like 01-Feb-20 04:52 PM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/1580604756049-510FF.png 01-Feb-20 04:52 PM <__ice9#6039> I didn't really keep track of the costs, but I can make a quick estimate based on the parts in the final version 01-Feb-20 04:53 PM I'm also interested in the output quality and quantity for the cost 01-Feb-20 04:55 PM <__ice9#6039> Estimate about $170 total for all materials 01-Feb-20 04:55 PM <__ice9#6039> Output was 5L/min while making that little puff of thermal lance material, but I'm not certain about the actual purity level given I don't have a general 0-100% oxygen sensor atm 01-Feb-20 04:55 PM <__ice9#6039> Granted it was overstressing my air compressor. Output is apparently 7L/min when the compressor has a full tank 01-Feb-20 04:55 PM <__ice9#6039> This used 1kg 5A zeolite and about 0.5kg 13X zeolite. I didn't pay up for the lithium-functionalized kind. But I might try to make some myself later. 01-Feb-20 04:59 PM how large is your compressor tank? 01-Feb-20 04:59 PM <__ice9#6039> Idk 3 gallons maybe 01-Feb-20 04:59 PM ahh a little one 01-Feb-20 04:59 PM <__ice9#6039> Keep in mind the large majority of the input air is vented 01-Feb-20 04:59 PM yeah because its mostly nitrogen 01-Feb-20 05:00 PM <__ice9#6039> I got the sieves from various sources 01-Feb-20 05:00 PM <__ice9#6039> Mostly eBay 01-Feb-20 05:00 PM <__ice9#6039> Amazon was cheapest for 5A at the time, but it's the rarest one in there and I bought a 1 stock item, so not sure now 01-Feb-20 05:00 PM <__ice9#6039> The preconditioner uses silica gel and zeolite 3A 01-Feb-20 05:00 PM <__ice9#6039> Also a water separating regulator unit 01-Feb-20 05:00 PM <__ice9#6039> Keeping the sieves in the actual PSA chambers dry is very important 01-Feb-20 05:00 PM <__ice9#6039> You can find the layout in one of my earlier posts in the 'resources' section 01-Feb-20 05:00 PM <__ice9#6039> I have been unable to locate any carbon molecular sieve 3A in reasonable quantities however. 01-Feb-20 05:00 PM <__ice9#6039> I am interested in buying some 02-Feb-20 09:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200202_181931-694E5.jpg 02-Feb-20 09:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200202_181941-32C6E.jpg 02-Feb-20 09:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200202_181955-4D250.jpg 02-Feb-20 09:22 AM dewar adapter! 02-Feb-20 09:22 AM the bnc leads to a small resistor for up tp 5W of heating 02-Feb-20 09:34 AM <__ice9#6039> Very nice 02-Feb-20 09:34 AM <__ice9#6039> What is the heat for? Providing pressure to pump the liquid? 02-Feb-20 09:45 AM Yep! 02-Feb-20 03:18 PM Looks great! 03-Feb-20 04:02 AM Why the heater? The dewars i use have a valve that bubbles part of the gas through the liquid to warm it further 03-Feb-20 05:19 AM because mine doesn't have that 03-Feb-20 06:55 AM Ah. Did you diy the adapter? 03-Feb-20 07:01 AM yep! 03-Feb-20 07:01 AM hence the posting in #show-and-tell 03-Feb-20 07:04 AM Cool :) 03-Feb-20 07:07 AM not yet! 03-Feb-20 07:07 AM will be, either today or wednesday 03-Feb-20 07:07 AM still trying to organize the Delivery 03-Feb-20 07:30 AM neither, thursday :< 03-Feb-20 07:52 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200203_164634-F28A9.jpg 03-Feb-20 07:52 AM yay it holds 03-Feb-20 08:04 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200203_170328-3F34D.jpg 03-Feb-20 08:04 AM quick and dirty ln2 safe valve 03-Feb-20 11:11 AM Is it possible to reconfigure it for N2 production? 03-Feb-20 11:11 AM @__ice9 03-Feb-20 11:21 AM it's cheaper and easier to make an N2 separator 03-Feb-20 11:21 AM they're generally simpler and more efficient than O2 03-Feb-20 11:39 AM Also no kaboom 03-Feb-20 12:43 PM <__ice9#6039> N2 can be separated by membrane methods or by PSA 03-Feb-20 12:43 PM <__ice9#6039> Membranes are easier since it is already 78% of the mix 03-Feb-20 12:43 PM <__ice9#6039> Whereas for O2 it's usually necessary to do PSA if you want decent purity 03-Feb-20 12:43 PM <__ice9#6039> Amusingly, reverse osmosis filter modules already have the correct pore size to remove Ar and O2 from N2, though you need a bit of backpressure to force them through the membrane and out the center tube-- so a decent quality needle valve and a pressure gauge are helpful 03-Feb-20 12:43 PM <__ice9#6039> You still need to remove the CO2, though, if you are going to liquefy the nitrogen. Various methods exist. I am using some large tubes full of 13X zeolite that do temperature-swing adsorption on about a 20 minute cycle 03-Feb-20 12:43 PM <__ice9#6039> With vent gas provided by a little air pump 03-Feb-20 12:43 PM <__ice9#6039> Running from the raw nitrogen supply 03-Feb-20 12:43 PM <__ice9#6039> The reverse osmosis membrane filters must be kept scrupulously dry, however.... 03-Feb-20 12:43 PM <__ice9#6039> And they need particulate prefilters to prevent clogs 03-Feb-20 12:43 PM <__ice9#6039> A water-separating regulator followed by a canister of silica gel and a canister of zeolite 3A is enough 05-Feb-20 10:28 AM Valve life 05-Feb-20 10:28 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-EE15F.jpg 05-Feb-20 07:08 PM <__ice9#6039> "solid carbide" drill bit 05-Feb-20 07:08 PM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200205_204107-B969D.png 05-Feb-20 07:08 PM <__ice9#6039> Instead of only certain cutting surfaces, the entire thing is made of cobalt-cemented tungsten carbide (Moh's 9.5) 05-Feb-20 07:08 PM <__ice9#6039> Apparently these go through stainless and hardened steel much more easily than cobalt steel bits, without all the bouncing and skittering and gummy metal dust that come from trying to use diamond grinding tools on steel 05-Feb-20 07:08 PM <__ice9#6039> They still need good lubrication and water cooling, and they are fairly brittle so they cannot be used with hand drills. Only drill presses. 05-Feb-20 07:08 PM <__ice9#6039> This one is brand new and so sharp that I cut myself by accident while feeling the edges 05-Feb-20 07:08 PM <__ice9#6039> I bought it for cutting gas transport channels through a large stack of stainless steel plates in an attempt to build a gas-segregating water electrolyzer 05-Feb-20 07:08 PM <__ice9#6039> Using viscose felt as the gas segregation membrane, as Nafion is far too costly and I don't mind some loss of efficiency. I'm not running a power company. 05-Feb-20 07:08 PM <__ice9#6039> Anyway, these are mostly for boring holes in hard metals. For ceramics, diamond bits are usually a better choice. 05-Feb-20 09:06 PM Those can’t be cheap! 06-Feb-20 06:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200206_144227-B8CBE.jpg 06-Feb-20 07:11 AM fun fun 06-Feb-20 07:18 AM my very own Flüssigstickstoffwerfer 06-Feb-20 07:19 AM how much approximately does LN2 cost you in that quantity? 06-Feb-20 07:22 AM ~2€/l 06-Feb-20 07:23 AM thats quite good and that with delivery? 06-Feb-20 07:23 AM ~2€/l @GigaSquirrel ok 06-Feb-20 07:24 AM Delivery, tax, everything 06-Feb-20 07:25 AM plus they're just really nice guys to deal with 06-Feb-20 07:25 AM always having a good laugh when they come 06-Feb-20 07:25 AM most other companies I've asked for a quote were like "we'll sell it to you but we won't like it" 06-Feb-20 07:27 AM oh ok, so far everything i had also quite good experience with those services 06-Feb-20 07:27 AM but it is probably different in different areas... 06-Feb-20 07:28 AM ~2€/l @GigaSquirrel i can get it only for 10/l or 20/l in under 100liter so bad 06-Feb-20 07:29 AM that's tough 06-Feb-20 07:33 AM geez 06-Feb-20 07:34 AM After some changes the cold lab of a local technical university had to sell services 06-Feb-20 07:34 AM the worst quote I got was 2.8€/l plus a fix cost of ~45 bucks, plus tax 06-Feb-20 07:34 AM So they sold LN2 among other things, like wirebonder time 06-Feb-20 07:34 AM They also had liquid helium in their catalog at one point 06-Feb-20 07:34 AM IIRC was 20eur/liter with student discount 06-Feb-20 07:34 AM LN2 was 0.5eur/liter or 1eur/liter with student discount. 06-Feb-20 07:34 AM Never used it, but friends did. As they did have devars. 06-Feb-20 08:11 AM oh wow, 20€/l is actually pretty good 06-Feb-20 08:11 AM when was that? 06-Feb-20 08:11 AM I asked them today out of curiousity and they told me around 5x that 07-Feb-20 12:19 AM he prices kinda exploded right? 07-Feb-20 02:06 PM Now the liquid helium is "please call" :( 07-Feb-20 02:06 PM My employer at the time bought wirebonder time form them. 07-Feb-20 02:06 PM Well bonder+operator 07-Feb-20 02:06 PM Probably because your regular party caterer doesn't buy cylinders of LHe every day 07-Feb-20 03:35 PM That and it IS an university cold lab first, not a gas supplier 07-Feb-20 03:35 PM Woikoski or AGA here for industrial gasses 07-Feb-20 03:35 PM Or if you are rich, you can get a generator from lazergas (a domestic supplier) 07-Feb-20 03:35 PM Oh neat Woikoski exports liquid helium 07-Feb-20 04:49 PM <__ice9#6039> More x-ray shielding, shipped as lead burrito 07-Feb-20 04:49 PM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200207_183426-8CFD5.jpg 07-Feb-20 04:49 PM <__ice9#6039> 1/16" is often the cheapest by mass. For higher energy, just stack it. http://athopkins.stanford.edu/shields.html for specific isotopes https://www.nde-ed.org/EducationResources/CommunityCollege/Radiography/Physics/HalfValueLayer.htm (per discussion below) for x-rays 07-Feb-20 04:49 PM <__ice9#6039> Silky smooth radium storage pig, cover removed to show surface detail 07-Feb-20 04:49 PM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200207_185412-4B110.jpg 07-Feb-20 04:57 PM tasty 07-Feb-20 05:03 PM Remember that 0.01% of 1Sv/hr is still 1uSv/hr 07-Feb-20 05:03 PM And a serious x-ray tube will output not 1, but maybe 10 or 100 sv/hr 07-Feb-20 05:48 PM ^^^ 07-Feb-20 11:58 PM <__ice9#6039> Why would I run it for an hour 07-Feb-20 11:59 PM Tomography for example 07-Feb-20 11:59 PM <__ice9#6039> But anyway yes, an extra layer is cheap and whacks it for another factor of 10000 07-Feb-20 11:59 PM Yes 07-Feb-20 11:59 PM https://www.nde-ed.org/EducationResources/CommunityCollege/Radiography/Physics/HalfValueLayer.htm 07-Feb-20 11:59 PM Nice cheat sheet for lead HVL 07-Feb-20 11:59 PM 1/16" makes 5.879 half-value layers at 100kv 07-Feb-20 11:59 PM so you get closer to 1-2% 07-Feb-20 11:59 PM so to get 99.99% attenuation you'd need 3.587mm of lead 07-Feb-20 11:59 PM ish. 08-Feb-20 12:19 AM <__ice9#6039> I just used the calculator from the Stanford website linked above 08-Feb-20 12:20 AM note the input 08-Feb-20 12:20 AM it's not energy, it's hvl 08-Feb-20 12:21 AM <__ice9#6039> At a glance, the page that you linked is likely to be a better model, since it appears to account for the complete spectrum. Note table at bottom. 08-Feb-20 12:22 AM yeah 08-Feb-20 11:12 AM Ok to just tell here? Someone in a collaborating lab accidentally sent 20kV to a $10,000 national instruments DAQ. Rip. 08-Feb-20 11:12 AM Ouch 08-Feb-20 11:13 AM Connected their voltage divider wrong 08-Feb-20 11:13 AM Oops 08-Feb-20 11:13 AM did the whole thing die? 08-Feb-20 11:13 AM Just one of two channels 08-Feb-20 11:13 AM (Yay well designed boards?) 08-Feb-20 11:40 AM Had to build a bumper cage because people kept walking into my forevac 08-Feb-20 11:40 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-88907.jpg 08-Feb-20 12:35 PM Rubber baby buggy bumpers 08-Feb-20 01:08 PM <__ice9#6039> Useful actually. 08-Feb-20 09:47 PM Working on the stem press machine this weekend. Its pressing fine but not liking the color of the seals. Too dark. Going to try different leads and bead them differently tomorrow. May use uranium glass as it is easier to use. 08-Feb-20 09:47 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_7778-B2A94.jpg 08-Feb-20 09:47 PM Also I had the leads set too low in the head. Already fixed that. 08-Feb-20 09:52 PM have you posted photos of the actual press parts before? not sure if I just missed it or what but I would love to see it 08-Feb-20 10:00 PM Tomorrow if I get a chance to clean up I will take a picture 08-Feb-20 10:02 PM Is that borosilicate or soda lime? 08-Feb-20 10:02 PM Also, those evacuation tubes look awfully squished :P 08-Feb-20 10:02 PM (unless that's how it's supposed to work?) 08-Feb-20 10:07 PM 7720 nonex and yes they are supposed to be squished. After the jaws press you heat a spot on the side and blow air down the tube to create a new hole for exhaust. Works quite well. 08-Feb-20 10:08 PM Looks like nonex is out of production 08-Feb-20 10:08 PM But it's borosilicate 08-Feb-20 10:08 PM Apparently Schott 8250 is the replacement 08-Feb-20 10:08 PM Are these kinds of seals difficult to create? 08-Feb-20 10:08 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Pyrex-Glass-Tube-w-Logo_01-1EA58.png 08-Feb-20 10:08 PM Kovar to Borosilicate 08-Feb-20 10:08 PM "includes uranium transition glass section" 08-Feb-20 10:10 PM Yes they stopped making it in about 1995 or so. I have a large left over supply 08-Feb-20 10:10 PM Schott has a modern equivalent 08-Feb-20 10:10 PM Those types of seals are not particularly difficult. 08-Feb-20 10:11 PM The only kovar sealing video I've seen is just... "here, we place a bit of kovar on glass, and now we blast it with induction heating" 08-Feb-20 10:11 PM Which seems a bit oversimplified 08-Feb-20 10:11 PM They appear however to be Kovar type seals as the color indicates 08-Feb-20 10:11 PM Yeah I'd have to buy kovar tubes and machine them myself 08-Feb-20 10:11 PM But I might be able to buy that, at least 08-Feb-20 10:12 PM Very much so. Kovar is actually very sensitive to its oxide layer. Generally it can however be done all at once with an experienced operator. 08-Feb-20 10:13 PM So what are the issues to look out for? 08-Feb-20 10:13 PM Do I just... heat the glass, and push it on? 08-Feb-20 10:13 PM Or is it some sort of knife edge, or houskeeper? 08-Feb-20 10:14 PM Depends on many things. Flame condition, dew point/humidity and surface condition of the metal. All need to be determined for the specific place, time, and operator performing the seal. 08-Feb-20 10:14 PM Remember you are bonding to an adherent later of oxide not the metal 08-Feb-20 10:15 PM If I were to make an x-ray tube, I was thinking of making a kovar to [beryllium/Li-B/carbon/whatever] seal on one end, and glass on the other 08-Feb-20 10:15 PM If the oxide is too thick it can leak, if it’s too thin it has no strength 08-Feb-20 10:15 PM Is the oxide grown right at the sealing stage? 08-Feb-20 10:16 PM That was traditionally the way. Beryllium brazed you a Kovar sleeve which in turn was sealed into the glass 08-Feb-20 10:17 PM Brazing without direct heat is also still puzzling to me 08-Feb-20 10:17 PM Sometimes right at sealing, sometimes oxidized en mass just before to get closer control for a while batch. Just depends. Large tubular seals are usually done by experienced operators on a lathe 08-Feb-20 10:17 PM If I were to make an x-ray tube I wouldn't make it large 08-Feb-20 10:17 PM The window braze was done with RF induction heating 08-Feb-20 10:17 PM Maybe 30mm in diameter 08-Feb-20 10:17 PM I can't easily get larger borosilicate 08-Feb-20 10:18 PM I would not mess with the beryllium and just make a glass type. Much easier. 08-Feb-20 10:18 PM Heck a high voltage damper vacuum tube can serve as a moderately useable X ray source 08-Feb-20 10:19 PM I'm aiming to avoid beryllium and use a different window 08-Feb-20 10:19 PM Yeah. Solid beryllium is pretty much poison 08-Feb-20 10:19 PM But if you scroll up you can see the goal - a microfocus tube with a sputtered anode 08-Feb-20 10:19 PM Solid Be is safe 08-Feb-20 10:19 PM anything other than solid Be is not 08-Feb-20 10:19 PM which is the painful bit 08-Feb-20 10:19 PM because Be does not like to stay solid 08-Feb-20 10:20 PM Exactly 08-Feb-20 10:20 PM In allowed form it is much safer. Don’t know why people panic over that 08-Feb-20 10:20 PM if I were to do beryllium work I'd just do it entirely under something inert 08-Feb-20 10:20 PM a giant tub of IPA or something 08-Feb-20 10:21 PM Alloyed form I meant. Damn I phone 08-Feb-20 10:21 PM everything from the moment it arrives at my door, all the way until brazing 08-Feb-20 10:21 PM I just need a really really low x-ray generation material 08-Feb-20 10:21 PM so low atomic mass 08-Feb-20 10:21 PM thus my only options are Li, Be, B, and C 08-Feb-20 10:21 PM I'm waiting to hear from the manufacturers of LiB alloy about how stable it is in air 08-Feb-20 10:21 PM it'd be an awesome alternative to Be 08-Feb-20 10:23 PM Hahahaha.. if it arrives folded in mineral oil and liquid nitrogen cooled you will have your answer! 08-Feb-20 10:23 PM That's why I asked first! 08-Feb-20 10:23 PM But it does seem to be vacuum bagged :( 08-Feb-20 10:23 PM Makes sense, it's Li 08-Feb-20 10:23 PM Flooded argh. Ok. It’s too late for me to type and spell at the same time 08-Feb-20 10:24 PM it's actually folded 08-Feb-20 10:24 PM in weird vacuum bags 08-Feb-20 10:24 PM But I also see conflicting images of giant rolls of it just sitting on a table 08-Feb-20 10:25 PM Have you ever seen lipo packs being make? They wrap the layers of foil like an old oil filled capacitor. The room is a special zero humidity clean room they do it in 08-Feb-20 10:25 PM Yep, that's similar to the bags this comes in 08-Feb-20 10:25 PM and LiB is the anode for Li packs 08-Feb-20 10:26 PM I have heard for certain places they wear basically indoor respirator suits and the room is flooded with nitrogen 08-Feb-20 10:27 PM I haven't seen that 08-Feb-20 10:27 PM But yeah, it's cleanroom environments to prevent dust from shorting packs 08-Feb-20 10:27 PM Are the kovar seals made using knife edges? 08-Feb-20 10:27 PM Where the glass envelops it on both sides? 08-Feb-20 10:27 PM From what I can see it seems to hug it only on the outside, but that video is conflicting 08-Feb-20 10:33 PM Generally no knife edge with Kovar and the glass is on the outside as it will hold the metal in compression. Knife edge is only with housekeeper seals when there is an appreciable difference if coe on the materials and it needs to be thin to flex and not build up too much stress. 08-Feb-20 10:33 PM Oh also molybdenum seals in quartz use rolled or flat edges for the same reason. 08-Feb-20 10:34 PM So just a smooth piece of metal tube that is otherwise untouched? 08-Feb-20 10:35 PM Correct 08-Feb-20 10:35 PM Generally pretty thin too 08-Feb-20 10:35 PM Does thickness matter, or can I seal the glass to a solid metal puck? 08-Feb-20 10:36 PM Theoretically no but thick items generally create differential cooling rates and that’s bad 08-Feb-20 10:36 PM So it's more of a "within reason" thing 08-Feb-20 10:36 PM Correct 08-Feb-20 10:36 PM That's more convenient 08-Feb-20 10:36 PM My idea is to make this kind of window out of kovar rod: 08-Feb-20 10:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/BX1-EKR-6BB2C.png 08-Feb-20 10:37 PM I have seen very large Kovar sheet seals made to glass where a shaft is mounted perpendicularly in the center and was used as a manipulator inside the glass vacuum chamber via the flex in the sheet itself 08-Feb-20 10:37 PM And seal it directly to a glass tube(x-ray tube body) on the other end 08-Feb-20 10:37 PM I could also attempt something like this 08-Feb-20 10:37 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/9-401-55E99.png 08-Feb-20 10:37 PM But then the issue becomes brazing the actual window material, whatever it will be, to this ring 08-Feb-20 10:37 PM and not having it fall apart during sealing to glass 08-Feb-20 10:38 PM Remember x rays depart tangentially to the impact. 30 degrees comes to mind 08-Feb-20 10:38 PM It's going to be a transmission tube 08-Feb-20 10:38 PM https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0156224&type=printable 08-Feb-20 10:38 PM I want to replicate this paper 08-Feb-20 10:38 PM Except in a practical manner 08-Feb-20 10:39 PM Oh. I have no experience with that. Those shapes of Kovar seem pretty doable. 08-Feb-20 10:39 PM Well, yeah, I'm not completely inept with machining, I can make the shapes 08-Feb-20 10:39 PM Just the seals is what worries me 08-Feb-20 10:39 PM I have seen things like that made around the shop. I personally have not done them though 08-Feb-20 10:40 PM Transmission tubes are disadvantageous because of their low power 08-Feb-20 10:40 PM Oh. I gotta go. Past my bedtime!!! 08-Feb-20 10:40 PM But on the other hand I can combine lots of different elements of a microfocus tube into a passive, sputtered piece of metal 08-Feb-20 10:40 PM Goodnight! 09-Feb-20 04:25 PM https://media.discordapp.net/attachments/499873492477411339/676219011729588264/DSC_2961.JPG 09-Feb-20 04:27 PM someone ended up getting that cylinder of sf6 09-Feb-20 04:28 PM Yea, thats my basement :) 10-Feb-20 12:04 AM <__ice9#6039> Trying ultrasonic soldering. Some test objects: boro glass, silicon carbide, tungsten carbide, quartz, yttria stabilized zirconia, porcelain, alumina, aluminum foil, ceriated tungsten, titanium, stainless 316, aluminum plate 10-Feb-20 12:04 AM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200210_015625-3754C.jpg 10-Feb-20 12:04 AM <__ice9#6039> The iron. Note heavy padding. 10-Feb-20 12:04 AM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200210_020334-CB668.jpg 10-Feb-20 12:27 AM <__ice9#6039> Hmm. Result: the transducer was still too weakly coupled to the iron. I have seen different designs that place the transducer at the tip itself, with some sort of thin thermal insulation. Maybe ceramic, not sure. That seems to require a transducer with a central hole though. I tried something similar with one on the side, but the transducer kept overheating. More thought on this is needed. 10-Feb-20 12:29 AM The way it's done in "for real" irons is that the tip is decoupled by a very long horn 10-Feb-20 12:29 AM That sits all the way in the handle 10-Feb-20 12:29 AM <__ice9#6039> In the interim, it seemed that that Silvabrite 100 soldered zirconia, tungsten carbide, silicon carbide, and stainless at 280C with a hotplate. It did not work well on boro or quartz. Barely on alumina, barely on aluminum. Not at all on titanium. Barely on tungsten and Kanthal. However, nothing really held on cooldown. 10-Feb-20 12:29 AM <__ice9#6039> No flux was used. 10-Feb-20 12:29 AM <__ice9#6039> Sn-0.7Cu with standard acid flux performed poorly on all materials tested 10-Feb-20 12:29 AM <__ice9#6039> I have seen Chinese machines that place the entire thing at the tip, but that's a better idea. That was what I tried to do here, but the epoxy block seemed to absorb too much energy. 10-Feb-20 12:53 AM you might just have the wrong length? 10-Feb-20 12:53 AM Yeah, they also need tuning 10-Feb-20 12:53 AM those are pretty worthless unless you are right at a nodal point 10-Feb-20 01:54 AM <__ice9#6039> That's very useful to know 10-Feb-20 01:54 AM <__ice9#6039> The SiC seems to have held, but it might just be intercalation with the grain structure 10-Feb-20 01:54 AM <__ice9#6039> But yeah it was evident that not enough energy made it to the tip. 10-Feb-20 01:54 AM <__ice9#6039> Kuroda Electric "Sunbonder" ultrasonic unit-- appears to have the transducer around the tip 10-Feb-20 01:54 AM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/1581328618274-17EAB.png 10-Feb-20 01:54 AM <__ice9#6039> https://m.youtube.com/watch?v=B9fbYO79988 Looks like a similar design. But maybe that is actually a counterweight or heater cartridge? 10-Feb-20 01:54 AM <__ice9#6039> https://m.youtube.com/watch?v=NpJ8T8JWMMw This one very clearly appears to have the transducer wrapped around the tip though 10-Feb-20 02:35 AM <__ice9#6039> Hmm anyway I have this but no 40kHz driver. Would likely need to make that. https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F223597410587 10-Feb-20 02:35 AM <__ice9#6039> Does not work at 20kHz 10-Feb-20 02:35 AM <__ice9#6039> But definitely has the length necessary 10-Feb-20 05:09 AM <__ice9#6039> @Spirit any idea whether it's possible to bore holes sideways through this without wrecking performance? I'm honestly not very familiar with ultrasonic horn design, other than the obvious requirements for stiffness (not sure why I thought epoxy might work when they are usually titanium or similar) and being thick enough not to break the tip off. 10-Feb-20 05:09 AM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/1581340059018-7F5FA.png 10-Feb-20 05:09 AM <__ice9#6039> Putting a couple bolts through it sideways to hold a soldering iron heater cartridge and tip assembly clamped rigidly to the fittings seems like a reasonable way to avoid overheating the horn and ensure a better mechanical coupling to the tip than I was able to achieve with the preceding 10-Feb-20 05:09 AM <__ice9#6039> Also fwiw the hole mass is partly balanced back by the cartridge+tip mass (still likely to be a touch heavier) 10-Feb-20 05:09 AM <__ice9#6039> I should be able to machine titanium with current tooling, though it won't be pleasant. 10-Feb-20 05:22 AM <__ice9#6039> Shaft collars to hold the cartridge with countersunk holes for these bolts 10-Feb-20 05:22 AM <__ice9#6039> Idk though, might still be inadequate coupling rigidity. Not sure how else to manage it without excessive amounts of custom fabrication, which presumably explains the $xxxx pricing for these units. 10-Feb-20 10:41 AM @__ice9 any changes in the horn will shift the resonance 10-Feb-20 10:41 AM A horn doesn't have to be very complicated, it just has to be a bit of a taper that resonates at the right frequency and focuses the maximum amplitude at the target 10-Feb-20 12:00 PM Well there are also multiple modes of resonance, much like that of a multimode laser. 10-Feb-20 12:00 PM So you can have a horn that vibrates, for example, in a perfect longitudinal mode or a figure 8 or only horizontal, etc etc. That's where things get complicated. 10-Feb-20 12:01 PM As long as it does that at the tip, it's fine 10-Feb-20 04:18 PM <__ice9#6039> Hmm I see. Then this isn't worth pursuing further. 10-Feb-20 04:18 PM Why not? 10-Feb-20 04:18 PM It is! 10-Feb-20 04:18 PM https://www.youtube.com/watch?v=iRh2oeB2OhQ 10-Feb-20 04:18 PM Take this for inspiration 10-Feb-20 04:18 PM Replace "dumb nothing stick" with "T12 cartridge" 10-Feb-20 05:05 PM <__ice9#6039> My lathe will not turn titanium with any kind of precision 10-Feb-20 05:05 PM <__ice9#6039> It's a pretty low quality lathe tbqh 10-Feb-20 05:05 PM <__ice9#6039> Works ok on plastics and soft metals 10-Feb-20 05:05 PM <__ice9#6039> Wouldn't trust it for that 10-Feb-20 05:06 PM You don't need titanium 10-Feb-20 05:06 PM <__ice9#6039> Anyway I don't know how to ensure the correct resonances, so this is not functionally different from just drilling holes through my existing 40kHz horn and bolting on a soldering cartridge 10-Feb-20 05:06 PM <__ice9#6039> Aluminum conducts too much heat. 10-Feb-20 05:07 PM https://www.youtube.com/watch?v=-E7zlQEk5MA 10-Feb-20 05:07 PM this video shows how to design and tune these systems 10-Feb-20 05:07 PM ironically this guy also made his own light bulbs and glass to metal seals 10-Feb-20 05:11 PM <__ice9#6039> It's interesting, but this would take days or weeks and still possibly fail 10-Feb-20 05:11 PM Look at the video 10-Feb-20 05:11 PM Don't be pessimistic 10-Feb-20 05:11 PM <__ice9#6039> Realistic. 10-Feb-20 05:11 PM No, not realistic 10-Feb-20 05:11 PM <__ice9#6039> Thanks again though. 10-Feb-20 05:11 PM This is super easy to tune 10-Feb-20 05:11 PM Empirical 10-Feb-20 05:19 PM Plus you can build a PLL driver that will automatically lock into the resonant frequency and prevent it from hunting when you detune it(say, by tinning or touching it to your surface) 10-Feb-20 05:28 PM <__ice9#6039> Another 3 days to get right 10-Feb-20 05:29 PM You want to build a replacement for a $3000 tool 10-Feb-20 05:29 PM Side note: to get around the temperature issue, why not make the "tool" of the horn a T12 tip clone? 10-Feb-20 05:29 PM They're meant to plug in directly to a handle, which obviously has to stay cold 10-Feb-20 05:30 PM <__ice9#6039> If anything, this informs me better as to why the second one I hacked together worked better in some orientations than others, but never really managed to project power quite correctly. These are clearly much more subtle than ultrasonic cleaning systems or even welders. 10-Feb-20 05:33 PM https://github.com/leacog/PLL-ultrasonic-driver 10-Feb-20 05:33 PM Oh look :P 10-Feb-20 05:33 PM Someone did all the work already! 10-Feb-20 05:33 PM And it's simple too 10-Feb-20 05:33 PM Good ol 4046 10-Feb-20 05:48 PM <__ice9#6039> 1 day to get that assembled, possibly 1.5, including locating and buying all the right form factors for all the necessary components since it's all SMD, but not including the delays while waiting for parts to arrive 10-Feb-20 05:48 PM <__ice9#6039> Can't buy it, so no, the work isn't quite done. Again, realistic. 10-Feb-20 07:54 PM How to give a chem lab worker PTSD: rub some almond extract in a cupboard. 10-Feb-20 07:54 PM Bonus points if they actually work with CN stuff 10-Feb-20 08:03 PM <__ice9#6039> Yeah actually. 10-Feb-20 08:03 PM <__ice9#6039> As a side note, very few cartridge respirators are actually rated for volatile cyanides 10-Feb-20 08:03 PM <__ice9#6039> I have one that is, but it's a military model 10-Feb-20 08:03 PM <__ice9#6039> Supplied air is the standard recommendation 10-Feb-20 08:03 PM <__ice9#6039> HCN smells a bit less syrupy than benzaldehyde, less sweet, but it's very similar 10-Feb-20 08:05 PM Sounds like you've had experience 10-Feb-20 08:06 PM <__ice9#6039> Depending on the odor threshold vs. short-term hazardous concentration, if you are preparing to try something that could generate toxic gases, it is often useful to make a very tiny amount of that gas with a few drops of reagents in a test tube so that you know what it smells like. 10-Feb-20 08:06 PM <__ice9#6039> https://twitter.com/__ice9/status/1153024280847888384?s=19 10-Feb-20 08:06 PM <__ice9#6039> https://twitter.com/__ice9/status/1153078765376946178?s=19 10-Feb-20 08:06 PM <__ice9#6039> From a while ago. Very pretty on the left actually. Ferrocyanide method. Right is ferricyanide. 10-Feb-20 08:06 PM <__ice9#6039> This was a number of months ago. 10-Feb-20 10:45 PM <__ice9#6039> First attempt at cloning Aremco Graphi-Bond 551-RN graphite cement, for assembly and repair of high temperature graphite furnace components and similar 10-Feb-20 10:45 PM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200211_004113-5F335.jpg 10-Feb-20 10:45 PM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200211_004237-EF0F3.jpg 10-Feb-20 10:45 PM <__ice9#6039> Ingredients: start with a blend of about 60/40 methanol and ethanol, add a little bit of fumed silica, then sift in about 50/50 graphite/phenolic powder with heavy stirring until it thickens up into this tarry material. Apply as paste between components to bond. Move components in circular motion while compressing and smear cement into fillets along edge grooves between parts. 10-Feb-20 10:45 PM <__ice9#6039> Will see tomorrow whether it worked or not. Should probably be fired slowly to at least 1200C to convert into solid carbon and then later at least 2000C in the graphite furnace to graphitize. 11-Feb-20 01:38 AM <__ice9#6039> It seems to have worked. It set into a hard, dried-tar-like substance and appears to be holding the two blocks together. Bits can be broken off around the edges with some force but it does not crumble. This is a lot better than I expected. Placed it in the furnace along with a few other test objects for initial firing attempt when the furnace cement finishes curing -- including an attempt at casting a crucible from the leftovers, which can be re-liquefied by adding more methanol the same way water is used to thin refractory silicate cement into slip. 11-Feb-20 04:52 AM @__ice9 is pretty much a human version of Google's "I'm Feeling Lucky" button. 11-Feb-20 04:52 AM except you never get crappy results 11-Feb-20 05:14 AM Heh. Sure seems so. Endless interesting information. 11-Feb-20 08:20 AM <__ice9#6039> Hmm glad it's interesting 11-Feb-20 08:20 AM hehe yea that's pretty cool stuff 11-Feb-20 08:21 AM <__ice9#6039> @Spirit turned out based on more testing that the existing driver has PLL already, so the issue was definitely the coupling epoxy. Means that design on hackaday could have never possibly worked. I'm going back to my original way that overheated the transducer but transferred power properly and just water-cooling the transducer. Escalating temp affected the piezo elements during testing so the cooling does seem to be needed. 11-Feb-20 08:29 AM <__ice9#6039> Next test run will use pure indium wire as the solder as well, particularly for glass at least. 11-Feb-20 10:04 AM Get a signal gen and tune it @__ice9 11-Feb-20 10:30 AM ^ 11-Feb-20 10:30 AM PLL is not magic 11-Feb-20 10:34 AM P(robably)L(azy)L(ies)about not being magic ;) 11-Feb-20 12:38 PM <__ice9#6039> Idk but it correctly drove both the 60kHz transducer it came with and a 40kHz horn I posted earlier 11-Feb-20 12:38 PM you need to tune the horn to be the same length as the halfwave of a completely floating unloaded transducer 11-Feb-20 12:39 PM I wasn't arguing any point I was making useless silly banter... 11-Feb-20 12:39 PM see Lindsay's video 11-Feb-20 06:40 PM What about an atmospheric pressure plasma jet enveloping the heating element tip? 11-Feb-20 06:41 PM on the fly plasma activation? 11-Feb-20 06:43 PM Not sure what you mean but it is basically just a small handheld jet of plasma 11-Feb-20 06:43 PM https://www.researchgate.net/publication/328009825_Characterization_of_a_Compact_Low-Cost_Atmospheric-Pressure_Plasma_Jet_Driven_by_a_Piezoelectric_Transformer 11-Feb-20 06:43 PM That solves nothing here though 11-Feb-20 06:43 PM Is the goal not to be able to solder otherwise unsolder able materials? 11-Feb-20 06:43 PM The plasma will clean the surfaces similar to how the vibration would be removing the contams and oxides. 11-Feb-20 06:53 PM it's closer to plasma activation but it's really neat, yeah 11-Feb-20 06:53 PM tip on getting piezo transformers: laptop CCFL inverters 11-Feb-20 06:53 PM specifically if you look for older Sony Vaio inverters, you can find PZTs and driving circuitry for less than $5 a piece 11-Feb-20 06:53 PM whereas brand new PZTs cost $20-100 a piece from prototyping companies 11-Feb-20 06:57 PM You can get some from Steminc. The French paper that did this one use one the steminc.https://youtu.be/gUXXjS_bq8g 11-Feb-20 06:57 PM https://www.steminc.com/PZT/en/multi-layer-piezo-transformer-55-khz-6w 11-Feb-20 06:58 PM Yeah, pretty expensive 11-Feb-20 06:58 PM especially with shipping 11-Feb-20 06:58 PM (and no driver) 11-Feb-20 06:58 PM sony vaio inverters are much cheaper and come with a tuned driver 11-Feb-20 06:58 PM 9USD is cheap in my hook 11-Feb-20 06:58 PM Shipping: $65 11-Feb-20 07:00 PM Yea their auto shipping quote for foreign shipments is high indeed. 9.95USD domestic for first item 11-Feb-20 07:01 PM https://www.ebay.com/itm/Inverter-Board-Inverteur-Sony-Vaio-PCG-3D1M/232657768562 11-Feb-20 07:01 PM There's listings like these 11-Feb-20 07:01 PM But most countries have repair shops that will sell these to you 11-Feb-20 07:02 PM Their packaging so so small I can only imagine there is some export tariff for some product category it may fall under More likely though that they shopping cart software is just overzealous 11-Feb-20 07:02 PM Very easy to find them locally pretty much everywhere 11-Feb-20 07:03 PM Sounds like the ticket, then, if their pzt specs fall where you need/want them 11-Feb-20 07:04 PM most do 11-Feb-20 07:04 PM almost the same as the steminc ones 11-Feb-20 07:04 PM couple kilovolts +- here and there, a good few milliamps +- some 11-Feb-20 07:16 PM https://tel.archives-ouvertes.fr/tel-01328854 the French paper btw 11-Feb-20 07:31 PM The eBay part is only like a dollar cheaper than the steminc, not really worth it for the hassle of desoldering and not knowing exact properties, IMO 11-Feb-20 07:32 PM but the ebay part has all the driving circuitry with it 11-Feb-20 07:37 PM ah 11-Feb-20 07:55 PM Not much to the driving circuitry anyhow though, and you'll surely be starting with a waveform generator to begin with. Dont imagine anything to be plug and play for the purpose of building an atmospheric pressure plasma jet sort of setup 11-Feb-20 07:55 PM Anyhow. The real topic I was trying to infuse here is the possibility of using a plasma jet to clean the to-bo-soldered surfaces while soldering. In stead of or in addition to ultrasonication. I imagine some overlap is utility but an uneducated to confidently declare where. 11-Feb-20 07:55 PM On the o e hand there is ample documentation to show plasma jet ahead of soldering will ensure better connections all around, but whether practical for removing and preventing oxide formation during the procedure I'm not 100%. Then on the glass soldering part I'm at the lowest level of certainty. 11-Feb-20 08:00 PM I'm not sure if plasma activation will allow perfect soldering 11-Feb-20 08:01 PM In any case I thi k a "proper" plasma jet would be easier to.perfect tha a 'proper' ultrasound situation as shaping a horn to produce ideal vibration mode is not an especially straightforward task. 11-Feb-20 08:01 PM Sry on mobile so my punctuation and words are quite poopy 11-Feb-20 08:01 PM Plasma cleaning during solder has been shown to increase bonding quality significantly. Can look for some papers on it regarding wire bonding in particular that has decent info 11-Feb-20 08:04 PM yeah, it does 11-Feb-20 08:04 PM most modern semiconductor fabs run a plasma clean on their wafers 11-Feb-20 08:04 PM if not multiple 11-Feb-20 08:13 PM <__ice9#6039> I made one of those 11-Feb-20 08:13 PM <__ice9#6039> It's actually quite hard to get right 11-Feb-20 08:13 PM <__ice9#6039> I think I failed at it like 10 times before getting one 11-Feb-20 08:13 PM <__ice9#6039> That actually worked 11-Feb-20 08:13 PM <__ice9#6039> The jet is very tiny as well 11-Feb-20 08:13 PM <__ice9#6039> Tried all kinds of different designs 11-Feb-20 08:13 PM <__ice9#6039> Jet is about 1 cm long 11-Feb-20 08:13 PM <__ice9#6039> Driven by a neon sign inverter power supply 11-Feb-20 08:22 PM What kind of wattage were you putting out on the transformer/inverter? 11-Feb-20 08:37 PM <__ice9#6039> 20kV 11-Feb-20 08:37 PM <__ice9#6039> Or something like that 11-Feb-20 08:37 PM <__ice9#6039> It was through porous alumina 11-Feb-20 08:37 PM <__ice9#6039> I built this. https://www.sciencedirect.com/science/article/abs/pii/S0304388611000039 11-Feb-20 08:37 PM <__ice9#6039> Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/1-s2.0-S0304388611000039-gr1_1-ABFAA.jpg 11-Feb-20 08:37 PM <__ice9#6039> And it actually worked. 11-Feb-20 08:37 PM <__ice9#6039> None of the others I tried worked consistently 11-Feb-20 08:37 PM <__ice9#6039> Dielectric barrier discharge just was not reliable at making an extended plasma jet (plenty of plasma inside the tube but never survived being blown out of it) and not arcing, even in argon 11-Feb-20 08:37 PM <__ice9#6039> Direct non-transferred-arc torches worked but often jumped to and energized the target with high voltage 11-Feb-20 08:40 PM Curious what your ac frequency was? As they cite the high frequency of the PZT discharges a a good aspect 11-Feb-20 08:41 PM <__ice9#6039> Putting a quartz tube on the output spike of a Tesla coil and blowing argon through it produced a magnificent plasma blowtorch like discharge though 11-Feb-20 08:41 PM <__ice9#6039> About 45kHz 11-Feb-20 08:41 PM <__ice9#6039> The Tesla coil was about 850kHz 11-Feb-20 08:41 PM <__ice9#6039> DBD needs high frequency AC to work well 11-Feb-20 08:41 PM <__ice9#6039> Arcs do not, but they are usually hot, not cold 11-Feb-20 08:41 PM <__ice9#6039> The Tesla coil jet was 'warm' plasma 11-Feb-20 08:41 PM <__ice9#6039> Not cold but not fully equilibrium either 12-Feb-20 02:58 PM FUN FACT: you can use regular nuts from 10 series (1” with 1/4-20 bolts) T-slotted profiles as drop-in nuts with 15 series (1.5” with 5/16-18 bolts) if you drop in a washer after 12-Feb-20 02:58 PM Words cannot express how fun this fact is to me right now. 12-Feb-20 05:15 PM haha. I have been going with the metric series' and buying the t-nuts in quantity off the china sites 12-Feb-20 05:18 PM someone decided that using the 20mm series to make enclosures on our 1" grid 1/4-20 optical table made sense 12-Feb-20 05:18 PM maybe I'm just as dumb for using 15 series (5/16-18 bolts) to hold my vacuum chambers (5/16-24 bolts) 12-Feb-20 05:28 PM meh, consistency is all that matters IMO! 13-Feb-20 09:25 AM Adventures in rapid prototyping injection molding. Thermoplastic elastomer injection molded with a 3D printed mold. 13-Feb-20 09:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_2413-40A44.JPG 13-Feb-20 12:14 PM @piGuy nice! and what machine are you using for the injection itself? 13-Feb-20 12:51 PM wow thats awesome 13-Feb-20 01:29 PM @samy https://www.techkits.com/products/model-150a/ 13-Feb-20 08:15 PM https://media.discordapp.net/attachments/424014648757452800/677729596270968842/DSC_2962.JPG 13-Feb-20 08:15 PM Got a 6.75" blank woot 13-Feb-20 08:15 PM now to get a copper for it :) 13-Feb-20 08:16 PM Why does that exist ? 13-Feb-20 08:16 PM It’s like the 4 5/8” 13-Feb-20 08:17 PM No freaking clue... when I got this massive chamber I assumed it would be 6" from the photos and no measurements 13-Feb-20 08:17 PM but yea... its REALLY annoying, will have to machine and weld up my own adapter someday because well they don't sell adapters, only flanges or blanks new 13-Feb-20 08:17 PM I got this blank off ePay thankfully decently cheap 13-Feb-20 08:18 PM it's not even round in metric either 13-Feb-20 08:18 PM hrm.... 13-Feb-20 08:18 PM I wonder if it was for 6" wafers... 13-Feb-20 08:18 PM er no 13-Feb-20 08:18 PM the internal diameter is still smaller than 6 isn't it 13-Feb-20 08:18 PM yup 13-Feb-20 08:19 PM Someone asked for it enough they made a bunch I guess 13-Feb-20 09:05 PM An adapter is pretty trivial! 13-Feb-20 09:05 PM https://www.lesker.com/flanges/flanges-cf-reducer/part/rf675x600t 13-Feb-20 09:05 PM @Conmega 13-Feb-20 09:27 PM oh they DO have one, ok my quick searches gave nothing 13-Feb-20 09:27 PM but still thats more than I paid for that entire chamber shipped... lol 13-Feb-20 09:27 PM I think I'll just get a weldable 6" conflat flange for like 40 bucks then get the proper sized SS tube thats a few inches and just like... chuck up that 6.75" blank, cut the hole to match that on the 6" flange and just put the tube between the two and weld 13-Feb-20 09:27 PM probably the cheapest solution 15-Feb-20 01:49 PM Ha @Charles https://www.youtube.com/watch?v=RGw6fXprV9U 15-Feb-20 01:49 PM Speaking of uranium glass 15-Feb-20 02:22 PM Not a bad video. Somewhere I have seen the mixture for Corning 3320 glass which is basic Uranium/Canary glass for electrical use. I know it’s appearance varies widely. I have seen it from obviously very green to light yellow. I believe they added lead to it for electrical insulation purposes and to help in sealing but I just can’t remember. Otherwise the glass he made was basic Soda/lime style glass with boron added so I am not surprised it had stress fracture issues. I would have advised him to make a proper tub annealer and write a piece of software on an Arduino or something to slowly bring down the temp at a constant rate. 15-Feb-20 06:40 PM that puff of yellow dust when he dumps the ground powder back in...oof 15-Feb-20 06:40 PM at least that stuff is not that bad but i sure would not want to breathe it in 15-Feb-20 06:40 PM wonder if the inside of his fume hood is a giant alpha emitter now 16-Feb-20 04:44 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/EQyR-UPUYAAATId-FE842.png 16-Feb-20 04:44 PM This is just plain cool 16-Feb-20 04:44 PM From @yuna_digick on Twitter 21-Feb-20 12:49 PM I figure I might as well show off one of the monstrosities we inherited 21-Feb-20 12:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-C79B3.png 21-Feb-20 12:49 PM shiny 21-Feb-20 12:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-9E281.png 21-Feb-20 12:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-6EE76.png 21-Feb-20 12:49 PM note the off-axis tubes of varying lengths at weird angles. 21-Feb-20 12:49 PM the end flanges are 8" CF 21-Feb-20 12:49 PM this was made in 1992 and someone took the old paper drawings to make an almost-but-not-quite accurate CAD model 21-Feb-20 12:52 PM what was that from? :o 21-Feb-20 12:54 PM surface science 21-Feb-20 12:54 PM whatever that means 21-Feb-20 12:55 PM afaict it almost always means 'these flange clusters aren't clustery enough' 21-Feb-20 04:37 PM surface science chambers are cursed lol 21-Feb-20 04:37 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-DB94E.jpg 21-Feb-20 04:37 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-BDBB4.png 21-Feb-20 04:37 PM literally first google result for ‘xps chamber’ 21-Feb-20 04:40 PM that's cheating though 21-Feb-20 04:40 PM they have an STM in the background cluttering it up 21-Feb-20 04:40 PM and that top one is probably fine, the ports I see are pointed at the middle 21-Feb-20 05:38 PM Speaking of STM, picked this up the other week 21-Feb-20 05:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screenshot_20200212-233539_eBay-1DCAF.jpg 21-Feb-20 05:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screenshot_20200212-233703_eBay-31228.jpg 21-Feb-20 07:22 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/MVIMG_20200221_185944-7EDA5.jpg 21-Feb-20 07:22 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/MVIMG_20200221_185933-A1075.jpg 21-Feb-20 07:22 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/MVIMG_20200221_185940-23F13.jpg 21-Feb-20 07:23 PM fix your sig figs 21-Feb-20 07:24 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/MVIMG_20200221_185950-AE636.jpg 21-Feb-20 07:24 PM That text is straight out of the 901P 21-Feb-20 07:24 PM I only added a space and the word torr 21-Feb-20 07:27 PM it should fluctuate about 2% at best 21-Feb-20 07:34 PM It was still going down but i stopped pumping to go home 21-Feb-20 08:35 PM yea the 901p is nice and simple 22-Feb-20 04:18 PM @Metanoic what is that that you picked up? 22-Feb-20 04:23 PM Scanning probe head; looks to be from a scanning tunneling microscope 22-Feb-20 04:23 PM Basically a very sharp probe on a piezo scanning tube/cylinder that can be scanned across a small area of a sample while measuring current flowing across a very small gap between sample and probe tip. The current will vary exponentially with distance from sample, allowing you to "image" the sample at extremely high resolution. 22-Feb-20 04:28 PM nice 22-Feb-20 04:29 PM It was listed as something like "mitotoyu manipulator" or something equally mundane. One of those information asymmetry situations you can't pass up. 22-Feb-20 08:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/MVIMG_20200222_200942-09830.jpg 22-Feb-20 08:36 PM So it turns out that injecting Coldwater through a pore, in this case a needle, into a vacuum chamber, causes ice to form midair 22-Feb-20 08:38 PM @nmz787 what temp? and pressure? 22-Feb-20 08:40 PM The water was room temperature so probably like 20 or 23 Celsius, the pressure was less than one or two torr 22-Feb-20 08:40 PM It was being injected onto a hot plate inside the vacuum chamber, and just like if you threw an ice cube into a frying pan, the ice that formed midair would dance as a solid due to the layer of sublimation 22-Feb-20 08:40 PM But like, ice was forming on the tip of the needle that was penetrating the chamber wall, enough to actually cause the needle to be blocked 22-Feb-20 08:45 PM i'm confused as to why ice would form? 22-Feb-20 08:45 PM instead of vaporizing 22-Feb-20 10:07 PM Evaporation removes heat via the phase change from liquid to gas. The droplet is also well insulated due to the lack of thermal conduction by virtue of the vacuum. 22-Feb-20 10:07 PM I wonder. Is it still the leidenfrost effect if it's a layer of sublimated air cushioning the droplet instead of evaporated air? 22-Feb-20 10:07 PM Another contributing factor is that from a needle tip you're creating a small diameter sphere whose surface area:volume is very conducive to forming ice as you have a large area for evaporation and small internal volume/mass for the evaporation to cool 22-Feb-20 10:07 PM @nmz787 any chance of a video if you're still active on your task? Sounds neat to watch. 23-Feb-20 01:26 AM I've only got s short video of an ice flake dancing on the hotplate... But I can try to setup my camera with a tripod or something in a day or two and catch the injection and flake formation, for sure! 23-Feb-20 01:26 AM Since the injection port is literally just a needle poked through a rubber stopper, with a silicone plug in the luer lock end of the needle... I get a decent amount of air contamination at the same time fouling the vacuum... Leading to some latency for reproducing the effect. (Depending on the bore size of the needle... The smaller needle leaks 10s of millitor every few seconds, while the larger leaks hundreds or many hundreds of millitorr every few seconds) 23-Feb-20 01:26 AM Both injection ports allow the effect to transpire though 23-Feb-20 11:50 AM the flake is in the vacuum and not sublimating immediately? 23-Feb-20 11:59 AM It forms mid-air (err, mid space?) 23-Feb-20 11:59 AM Before hitting the hot plate 23-Feb-20 11:59 AM The water also splatters, and flakes stick to the bell jar surface too 23-Feb-20 11:59 AM I'll get a better video later today, hopefully 23-Feb-20 11:59 AM https://youtu.be/mFenj600lwA 23-Feb-20 04:34 PM So these are leads for glass stems. I thought they were all the same. About 30% were of a shorter length and somebody before I had gotten them had mixed them. I sorted them. By hand. All 25,000 of them. I am now psychologically injured from the experience. But at least I can now sleep knowing I brought order to them. Hahahah 23-Feb-20 04:34 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-634B6.jpg 23-Feb-20 04:34 PM The ones in the red bin are about .150 shorter than the rest in the cups and the box underneath. They were originally packed in brittle plastic tubes that had all broken over time. 23-Feb-20 04:34 PM They have Tungsten seal portions. 23-Feb-20 04:34 PM Btw if anybody needs any pins for sealing to Pyrex or Duran apparatus let me know. I actually am planning on trying to seal ready made pin seals on eBay to see if I there is any side business in that. 23-Feb-20 04:34 PM But if you need some pins for yourself let me know. I can put some in an envelope if you need a few 23-Feb-20 05:35 PM What's a general use case? Feedthroughs for reasonably high current? 23-Feb-20 09:00 PM Yes. Primarily for tubes and feed throughs. 23-Feb-20 09:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-9E16A.jpg 23-Feb-20 09:06 PM @Charles I would buy a couple off of you! 23-Feb-20 09:10 PM I have pre beaded pins too. It’s 7720 nonex glass so you can seal it to Pyrex 23-Feb-20 09:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-20A67.jpg 23-Feb-20 09:40 PM @Charles have you made any KF feedthroughs? They look pretty similar to a KF fitting... I wonder if they'd take the compression of the KF clamp tho 23-Feb-20 09:44 PM oh god no 23-Feb-20 09:44 PM please do not compress glass like that 23-Feb-20 09:53 PM Actually yes I have. It actually does work but it is nothing I would recommend. Far better to have a proper one made from Kovar and pin seal that. 23-Feb-20 10:59 PM oh man that is a tempting offer...does it have an expiration date? not sure how long it will take to get to a point where i can put them to use 24-Feb-20 05:46 AM @nmz787 wow! Fascinating video. It is not what I was imagining - such peculiar behavior! 24-Feb-20 03:01 PM An acquisition from an antique store in Fairbanks, AK a while back: a tiiiiiny uranium glass insulator. While I have created several excellent and completely BS stories as to why this would have existed, I really have no idea why it does. 24-Feb-20 03:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-464C4.jpg 24-Feb-20 03:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-5D8C3.jpg 24-Feb-20 03:04 PM good old preionizing insulator 24-Feb-20 03:04 PM this looks a bit like a thimble to me 24-Feb-20 03:13 PM As in you would have stuck this in very, very old ion chamber? 24-Feb-20 03:18 PM Uranium glass has good properties. Better than pyrex if memory serves when it comes to electrolytic breakdown. 24-Feb-20 03:24 PM That was part of one of my BS justificatins. 24-Feb-20 10:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200224_214856-C9153.jpg 24-Feb-20 10:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200224_214848-5C058.jpg 24-Feb-20 10:49 PM I have made acquisitions 24-Feb-20 10:49 PM And apparently a friend is willing to let me use their massive ultrasonic bath. 24-Feb-20 10:49 PM Though I'm not entirely clear on vacuum chamber cleaning procedure other than "acetone, isopropyl, and tons of kimwipes" 24-Feb-20 10:52 PM nice! 24-Feb-20 10:54 PM bake? 24-Feb-20 10:55 PM I think the ultrasonic bath also bakes? Also friends has a vacuum oven that you can walk in. 24-Feb-20 10:56 PM you have to bake out moisture 24-Feb-20 10:56 PM Ah, yes, that's the strap heaters that you always put on 'em. 24-Feb-20 10:56 PM So everything vaporizes under vacuum, and heating helps that, then it just gets sucked out? 24-Feb-20 10:56 PM Well, there's outgassing 24-Feb-20 10:56 PM Removing any material that would outgas besides water is the goal, I suppose. 24-Feb-20 10:56 PM I really need to read this book I found today, I'll post the title and author in resources, though I kind of assume it's already been posted somewhere. 24-Feb-20 11:49 PM oh gosh nice hardware 25-Feb-20 12:43 AM @Laughing target pressure & gas load & pump? I took a conflat cross with a literal layer of dust and my process was 1. Hot soapy water 2. Rinse a few times with water 3. Isopropanol or acetone wiping 4. Hit -8 without baking, -10 after a few days of ~200C baking. 26-Feb-20 01:28 PM I have been building a collection of coins with the help of an NCGS photographer called the #NukeCoins. This was the most recent acquisition. 26-Feb-20 01:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-91C08.jpg 26-Feb-20 01:28 PM ENTDECKUNG DER RÖNTGEN-STRAHLEN 26-Feb-20 01:28 PM Very nice! 26-Feb-20 01:28 PM I really want one of those neutron activated dimes... 26-Feb-20 01:28 PM of course there is no activity left, but still... 26-Feb-20 01:28 PM very cool collectible 26-Feb-20 01:29 PM I have two 26-Feb-20 01:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-5D1DC.jpg 26-Feb-20 01:30 PM oh dang 26-Feb-20 01:30 PM you would not by any chance be interested in selling one of those? 26-Feb-20 01:31 PM Possibly, but eBay is probably easier. They aren’t hard to get. 26-Feb-20 01:32 PM all I've found so far don't ship to germany 26-Feb-20 01:32 PM nvm found one 26-Feb-20 01:34 PM AHA! Hooray! 26-Feb-20 01:36 PM not having any activity left will not stop me from taking a like day or two worth of spectra 26-Feb-20 01:39 PM Validate those zeroes! 26-Feb-20 01:55 PM Actually, I’m surprised there aren’t any irradiated marks from the olden days of the Deutsches Museum. 26-Feb-20 02:02 PM I'm not sure if there are 26-Feb-20 02:02 PM haven't "properly" been there for years 26-Feb-20 02:02 PM hell, I've worked there for a week and still find new stuff every time I go there 26-Feb-20 02:12 PM not my coin but a friend of mine who lives near Oak Ridge has come across a couple of these coins: https://i.gyazo.com/f93d65837a9b7700e00c185ebce35e35.jpg 26-Feb-20 02:12 PM his dad is a silverbug though and snatches them up before i hear about them though heh 26-Feb-20 04:16 PM Neat! I have been looking for, and completely failing to find, the similar irradiated dimes with holders from the Lawrence Hall of Science. 27-Feb-20 07:42 PM Cold head has been removed so 27-Feb-20 07:42 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-613A9.jpg 27-Feb-20 07:42 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-2861E.jpg 27-Feb-20 07:42 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-03D9D.jpg 27-Feb-20 08:05 PM thats a big turbo 27-Feb-20 08:10 PM Leybold 2200 iPL, iso 250-f. Big. 27-Feb-20 08:10 PM The chamber is custom and the top flange is also iso so if we need more pumping speed we can add another 27-Feb-20 08:54 PM cold head and comically oversized skirt 27-Feb-20 08:54 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screen_Shot_2020-02-27_at_8.54.05_PM-24846.png 28-Feb-20 01:17 AM awesome 28-Feb-20 01:24 AM I don't think I've never seen a coldhead that clean 28-Feb-20 04:43 AM @GigaSquirrel well you shop at the vacuum junk yard, lol 28-Feb-20 04:43 AM ( in a good way) 28-Feb-20 04:47 AM fair 28-Feb-20 07:05 AM It actually came really nicely packaged 28-Feb-20 07:05 AM Vacuum sealed bag with silica in between two pieces of foam perfectly cut out around it, in a crate 28-Feb-20 07:05 AM But also our 20 year old one is as clean with thermal crease on the top so eh it’s not all on being new 28-Feb-20 04:30 PM We recently opened up the source chamber on one of the instruments, so here's the coldhead+shield and skimmer 28-Feb-20 04:30 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200103_172015-2745F.jpg 28-Feb-20 04:30 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200103_172323-6F6F5.jpg 28-Feb-20 04:30 PM And fwiw our ~15 year old coldhead is similarly clean 28-Feb-20 04:34 PM that chamber looks even bigger on the inside 28-Feb-20 04:34 PM also 28-Feb-20 04:34 PM hilarious that you have also mounted your skimmer on a cone 28-Feb-20 04:34 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-9A93E.png 28-Feb-20 04:34 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-263FE.png 28-Feb-20 04:38 PM Yeah, the chamber is legitimately huge. Like, easily 8 feet tall and at least a foot wide 28-Feb-20 04:38 PM And yeah, I dunno why it's on a cone besides that it's commercial skimmer friendly 01-Mar-20 10:14 PM my IKEA hack for storing gases 01-Mar-20 10:14 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/AQ5ZeSf08Z-CBWomg65WNLzWcWu8cj5--Q2NzruEuz-D0BE0.png 01-Mar-20 10:14 PM yes I can build better storage that can take less space but this works right now 01-Mar-20 10:17 PM I do not like the idea of cylinders with unprotected valves beside a desk where things can get knocked off 01-Mar-20 10:18 PM make sense but on that side of desk there is plasma system I think if I knock that off I will have larger problems 01-Mar-20 10:18 PM that does make the point I should make a dolly with usable bench space on top 01-Mar-20 10:29 PM It really wouldn't be larger problems. Those cylinders will go through several walls and kill anything in their path if those valves get sheared. 01-Mar-20 10:30 PM that oxygen will explode probably sooner 01-Mar-20 10:34 PM looks like you could fairly easily stick a properly anchored to the wall set up for those cylinders instead of mesh baskets 01-Mar-20 10:34 PM then just put a tray over top of that to protect the valves 01-Mar-20 10:37 PM That's just all the more reason to not store the gases there... 01-Mar-20 10:37 PM Also not really sure if I buy the idea that there will definitely be a fire if the plasma system gets knocked down, though I don't know exactly what you mean by a plasma system either 01-Mar-20 10:44 PM yes thank you for teaching me gas safety which I clearly mentioned it is a hack 01-Mar-20 10:53 PM Just because you called it a hack doesn't magically make terrible safety practice okay 01-Mar-20 10:53 PM Especially when doing it right would be so easy here 01-Mar-20 10:53 PM You're right next to a wall. You can tie things down. You can put something on top that would catch anything that might fall down. Flammables don't need to be right there. 01-Mar-20 10:53 PM And I don't really care if you do something dangerous that only hurts yourself, but the second you start endangering neighbors and people around you, it's not okay, and this definitely falls into that camp 01-Mar-20 10:58 PM tbf a lot of people use those same cylinders at 15-100 PSi 02-Mar-20 12:45 AM @Mezmorizor well tying them to the wall was only for tipping/earthquake safety, I thought. That seems a bit independent of the valves getting knocked 02-Mar-20 06:20 AM Tipping can knock the valves. ie https://youtu.be/RqMKbu3WUsU?t=58 02-Mar-20 12:41 PM I don't see how chaining to the wall will prevent knocking off valve 02-Mar-20 12:41 PM thus the hack basket for small cylinders make sure you won't tip them over 02-Mar-20 12:47 PM Is the basket fixed to the floor or the wall? 02-Mar-20 12:47 PM The chain prevents the bottle from tipping over. 02-Mar-20 12:51 PM basket surface area is large enough so it doesn't tip over 02-Mar-20 01:01 PM this sounds like a serious injury situation waiting to happen 02-Mar-20 01:35 PM Chain and wall mount loops and screw-locked d rings are cheap at home depot 02-Mar-20 01:44 PM “Just weld all the cylinders together” 02-Mar-20 02:40 PM cylinder caltrops are very stable :D 02-Mar-20 02:49 PM I remember a warning when learning welding safety about not welding anything to the gas tanks. Are humans really that stupid? 02-Mar-20 04:13 PM Found this oddball at a local surplus store 02-Mar-20 04:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200302_160945-C4DF8.jpg 02-Mar-20 05:33 PM Ah! a DOODAD 02-Mar-20 05:33 PM In lieu of anyone else knowing what it is, @sarahdcady on twitter might recognize it 03-Mar-20 08:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-0ED61.jpg 03-Mar-20 08:06 PM heatshrink is good for vacuum right 03-Mar-20 08:06 PM the things you can do with 2200 L/s pumping speed 03-Mar-20 08:09 PM Oversized vacuum pumps are so handy 03-Mar-20 08:15 PM I said 2200 L/s but it's also right beside the cold head so I guess we have some good cryopumping going on too 03-Mar-20 09:22 PM So the heat shrink is in the vacuum side and there is a proper pin seal on them or is the heat shrink the actual seal cause that will not work. Also heatshrink makes a huge gas load and if you bake it, it will melt. Woven glass fiber sleeve is the right way to do it. You can steal it from old fiber optic cable. 03-Mar-20 09:25 PM Won’t be baking that chamber 03-Mar-20 09:34 PM <𝓕ermion#6024> where does the gas load come from? 03-Mar-20 09:34 PM <𝓕ermion#6024> the stuff enclosed by the heat shrink, or the material? 04-Mar-20 08:46 AM @idmb why even use heatshrink? 04-Mar-20 08:49 AM There’s 10 pins within about 1cm 04-Mar-20 08:49 AM So to avoid shorting 04-Mar-20 08:52 AM i would not bother, if you solder them right should be fine, also i like to use crimp contacts as a simple connector on forethought, sometimes you can use the simple ones used in D sub connectors 04-Mar-20 08:52 AM and you are using KF so even with or without the heat shrink 10-7 is no bit issue if you dont have a small diameter to pump and no optics and stuff that will get coated by solvents 04-Mar-20 08:54 AM Oh I have slide on connectors 04-Mar-20 08:54 AM The heat shrink is around those 04-Mar-20 08:54 AM I didn’t solder directly to the pins on the feed through 04-Mar-20 08:56 AM ok i would just leave the sheatshrink you can use some kapton, not the best but better ;), i like to use mostly crimp connections in vacuum they are also mutch more durable 04-Mar-20 08:56 AM They are crimp connections 04-Mar-20 08:56 AM But the wire is like 33awg 04-Mar-20 08:56 AM And we didn’t have crimp connections for that size 04-Mar-20 08:56 AM So they were soldered. 04-Mar-20 08:58 AM oh ok 04-Mar-20 08:58 AM i can recommend using Fluoropolymer Heatshrink like WS1813 for vacuum, but hard to get 04-Mar-20 09:04 AM In general, if it’s not lying around or on McMasterCarr with 1 day shipping we probably won’t use it. 04-Mar-20 09:04 AM Planning is unheard of 04-Mar-20 09:09 AM oh is it at work? where i work it is much more expensive if you make a mistake so waiting a view days is preferred 04-Mar-20 09:12 AM University research lab. Best practices are nice and all but this chamber has 1000s of L/s in pumping speed and in experiment will be at ~1E-4 torr from a helium gas load. 04-Mar-20 09:13 AM oh ok at ~1E-4 it does not really matter 04-Mar-20 09:13 AM sounds like an interesting project 04-Mar-20 09:39 AM What’s the voltage on these? 04-Mar-20 09:42 AM ~1-10 04-Mar-20 09:42 AM With very low current 04-Mar-20 09:42 AM It’s for cryo temp sensors 04-Mar-20 09:42 AM Which do V+/V- & I+/I- measurements and aren’t very sensitive to noise within the scale we care about 04-Mar-20 09:42 AM And then a 0.2W 50 ohm heater 04-Mar-20 10:41 AM Ok cool. I’ve had what I believe are corona effect / arcing problems with HV in a vacuum. 04-Mar-20 11:02 AM We tend to buy the proper stuff for that 04-Mar-20 11:02 AM Except when we use bnc 06-Mar-20 08:03 AM Droplet nozzle and skimmer over the big turbo 06-Mar-20 08:03 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-CF9B6.jpg 06-Mar-20 08:20 AM Pumping behind the skimmer with the gate valve closed sure takes a while 06-Mar-20 08:54 AM damn that looks nice 06-Mar-20 09:07 AM The copper part was made of oxygen free copper, but then shoved in a drawer for a year with no protection. Used to be really really pretty. For science only the inside had to be nice, so we didn’t spend time cleaning the outside. 06-Mar-20 09:39 AM <𝓕ermion#6024> you could probably clean it with flux 06-Mar-20 09:39 AM <𝓕ermion#6024> I use this blue flux for soldering coax. Noticed it brightens up all my OFHC parts nicely... heh 06-Mar-20 09:39 AM <𝓕ermion#6024> might leave schmutz though. Could follow with acetone/IPA/water. 06-Mar-20 09:43 AM blue flux sounds worrysome for me 06-Mar-20 09:43 AM 100% flux I have used ware yellow or clear 06-Mar-20 09:44 AM It was all sonicated in ipa and then acetone 06-Mar-20 09:44 AM I think I know the flux you speak of 06-Mar-20 09:44 AM and that stuff is like nasty stuff 06-Mar-20 09:44 AM it works REALLY GREAT but like 06-Mar-20 09:44 AM soldering with it creates carcinogenic fumes... 06-Mar-20 09:44 AM I can't remember the name but a friend gave me a small glass bottle of it incase I need it for restoring vintage stuff where there is SO MUCH CORROSION I can't get through to pads 06-Mar-20 09:44 AM which has happened a few times for me... needing A LOT of scraping to get down to actual metal 06-Mar-20 09:47 AM the best flux for really nasty corrosion or weird surfaces is zinc chloride in my experience... just will cause minor corrosion on everything in the vicinity if you aren't careful heh 06-Mar-20 09:47 AM hot it will eat through any corrosion though...and eventually your soldering iron tip 06-Mar-20 09:51 AM Hmm I do have zinc chloride infuzed sodlering paste somewhere, it's meant for soldering water pipes. Works well for that tho. 06-Mar-20 09:51 AM And in general all the truly good flux is carcinogenic in some way. 06-Mar-20 09:53 AM None of this sounds nice for UHP helium at cryo temperatures 06-Mar-20 06:03 PM <𝓕ermion#6024> @Conmega what’s funny is that the blue flux is our mild flux. 06-Mar-20 06:03 PM <𝓕ermion#6024> We have some much stronger stuff for soldering stainless steel coax. 06-Mar-20 11:30 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20200306_232947-D73F1.jpg 06-Mar-20 11:30 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20200306_233027-904A1.jpg 06-Mar-20 11:38 PM Annnnd I might have just scratched it slightly with a paper towel wipe off... Then a kimwipe with acetone :( 06-Mar-20 11:38 PM It's still 90-95% as shiny tho... 07-Mar-20 11:26 AM what is that? 07-Mar-20 06:03 PM The sealing edge for the top of my vapor deposition vacuum chamber 07-Mar-20 06:03 PM It began it's life destined to be a sewer pipe 07-Mar-20 10:03 PM i can't believe you deprived it of such a life 08-Mar-20 01:50 AM My vacuum deposition controller is almost ready to connect to my vacuum valve, and attempt some vapor phase chemistry! Mostly just have to make up another cable for the second pneumatic valve, then make sure my pneumatic connections don't leak air, then write a (python) program to sequence the valves according to the vacuum gauge and experimental protocol! 08-Mar-20 01:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200308_014458_exported_8243995098677-F0473.jpg 08-Mar-20 02:29 PM nice! 08-Mar-20 02:29 PM any projects in particular? 08-Mar-20 02:35 PM Coating a nickel nanoimprint lithography"shim" with anti-adhesion monolayer (FDTS) 08-Mar-20 02:39 PM cool 08-Mar-20 02:39 PM what's the black thing on the right below the LCD? and what's the board under the LCD? 08-Mar-20 02:39 PM on the left is that a motor controlled gas valve? 08-Mar-20 02:40 PM Below the LCD is a usb to rs232 converter, since the controller under it is a first-gen raspi 08-Mar-20 02:40 PM A little overkill I know but it was just sitting in a drawer or box for years with no purpose otherwise 08-Mar-20 02:40 PM Its a 12V DC solenoid controlled gas valve 08-Mar-20 02:40 PM https://www.amazon.com/dp/B07QN5LF6G/ 08-Mar-20 02:40 PM These relays https://www.amazon.com/gp/aw/d/B07TXMTPHR 08-Mar-20 02:40 PM Got an I2C interface ADC in the mail so I can hookup the buttons on the LCD screen, since they're connected as a resistor ladder sort of thing (the lcd board was meant for arduinos) 08-Mar-20 02:40 PM Probably going to add some manual slider switches for the valves so I can test things before writing a program to run it all 08-Mar-20 02:47 PM cool 08-Mar-20 02:47 PM thought it was a pi at first then only noticed one USB 08-Mar-20 02:48 PM The reaction has 2 reagents, water and FDTS, and then a 3rd valve will be for isolation from the vacuum pump (assuming this is what I want to do while flushing the chamber with reagent) 08-Mar-20 02:48 PM Yeah I've been connecting to the pi over serial 08-Mar-20 07:37 PM Using vacuum today. 08-Mar-20 07:37 PM Not terribly high vacuum at all. 08-Mar-20 07:37 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-F9B25.jpg 08-Mar-20 07:37 PM De-gassing casting investment. 09-Mar-20 03:43 AM Just gotta cut some sides and a top, and give this thing a whirl! 09-Mar-20 03:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20200309_034233-982D3.jpg 09-Mar-20 03:43 AM (and calibrate the temp sensors using ice water and boiling water... And write the program, and wire in the ADC and vacuum valve open/closed monitor circuits as well as get the code running for that) 09-Mar-20 03:43 AM The ADC stuff seems the lowest priority, after that the temperature sensor calibration... A degree or so off isn't a major issue I think right now 09-Mar-20 06:26 AM I’m a huge fan of the DS18B20 temp probe. 09-Mar-20 06:26 AM Not sure if it covers the range you need. 09-Mar-20 12:44 PM That's what I've got attached 09-Mar-20 12:44 PM They still need calibrated to each other though 09-Mar-20 12:52 PM (maybe they're fake??? Got them from Amazon) 09-Mar-20 01:07 PM If they ware really cheap then they are fake 09-Mar-20 01:07 PM Check the ID (should be unique) of them all 09-Mar-20 01:07 PM The cheapest clones all have the same ID 09-Mar-20 01:22 PM Hmm they worked chained together 09-Mar-20 01:40 PM People are faking them with the same IDs? Grrr...... 09-Mar-20 08:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-FE3DE.jpg 09-Mar-20 08:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-66D32.jpg 09-Mar-20 08:35 PM Looks hot 09-Mar-20 09:23 PM nice! what are you melting? 09-Mar-20 10:36 PM I need to have a small amount of a special alloy made. Primarily nickel with 20% cobalt and a tiny amount of silicon and magnesium. It has not existed in decades and I need it wire form that could then be rolled to various ribbon diameters. Does anybody have any experience in that sort of thing? A company that can do custom alloy to wire in small quantities? 09-Mar-20 11:00 PM Are you in CA? 09-Mar-20 11:06 PM Yes 09-Mar-20 11:06 PM i know a guy with a wire drawing setup...but not sure what sort of scale you are talking 09-Mar-20 11:06 PM his is more on the semi-industrial scale 09-Mar-20 11:07 PM A couple kg would be enough to satisfy demand for many years. The drawing part is not a problem. California fine wire can do it. My problem is getting it made into a wire form they can start from. 09-Mar-20 11:07 PM Also keeping it pure 09-Mar-20 11:10 PM from what i understand of the process the guy i know uses is most of the stock comes in 1/4" bar or round and then gets run through a rolling mill a few times 09-Mar-20 11:10 PM sounds like you do not need help on the wire drawing side of things though so i guess i can't really help 09-Mar-20 11:22 PM Ah, then without further inquiries I may not be able to help. I'll check next time i can hassle some people in Nuclear Engineering. 10-Mar-20 04:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200310_031033-04572.jpg 10-Mar-20 04:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200310_031028-7D9D7.jpg 10-Mar-20 04:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/MVIMG_20200310_0310132-2A1A1.jpg 10-Mar-20 04:06 AM All items hanging off a threaded KF that was epoxied in with hysol 10-Mar-20 04:06 AM Kinda sketchy 10-Mar-20 04:06 AM Ordered a 4" stainless bellows thinking I can use it to disconnect the valving mechanically, and secure it with straps or some bracket directly to the chamber 10-Mar-20 04:06 AM Still need to get another valve in there, for the rough vac line... And considering drilling another hole in the very bottom of the chamber and threading another KF fitting down there to attach the rough line to... Less stuff hanging here then 10-Mar-20 04:06 AM And also, I think it will be better for sucking the gas down the chamber, during the reagent purge cycles 10-Mar-20 04:06 AM I'm also thinking of adding an argon purge inlet, to make sure the chamber is totally clear of the previous reagent gas 10-Mar-20 04:06 AM Tested the setup with water tho tonight, in one of the side "reservoirs"... This thing 10-Mar-20 04:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200310_0311252-05B89.jpg 10-Mar-20 04:06 AM Just a kf elbow, with a blocking plate at the bottom... Filled to the bottom inner edge with distilled water 10-Mar-20 04:06 AM It went from around 200 mtorr to around 9 torr within about 5 or 10 seconds of the vacuum valve being opened 10-Mar-20 04:06 AM The temperature went down nearly 5 degrees C as a result, read at the KF clanp just after the valve 10-Mar-20 04:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200310_0311253-D0D19.jpg 10-Mar-20 04:06 AM Just kinda jammed the ds18b20 in behind the screw 10-Mar-20 04:06 AM Need to add diodes across the power rails on the input to the relay coils, was seeing around 100V spikes with my oscilloscope when I was switching them manually 10-Mar-20 04:06 AM Now I've only got diodes across the relay outputs... Thinking about the solenoid valves... Didn't think about the relay coils :/ 10-Mar-20 04:06 AM Hopefully the 1n4001 is fast enough, I've got some schottky's too, but they're a weird to220 package, while I'd much prefer axial 10-Mar-20 05:25 AM Casting was bronze 10-Mar-20 04:49 PM what are those two things on the KF cross? one is labeled '3' 10-Mar-20 05:00 PM not who you are asking but those are VAT pneumatic valves 10-Mar-20 05:00 PM about $20 on eBay while they last 10-Mar-20 06:53 PM ahh 10-Mar-20 07:26 PM it's crazy that the pneumatic valves are cheaper than the manual ball valves 10-Mar-20 07:43 PM ball valves mostly exist for high conductance 10-Mar-20 07:43 PM cheap pneumatic valves often have terrible conductance 10-Mar-20 09:59 PM throwing together a display for the 901P gauges i have finally https://i.gyazo.com/b38a838272484d52ccf3c3731fdfed95.png 10-Mar-20 09:59 PM bottom left will be a trend indicator and the unit is just going to be whatever the gauge is set for 10-Mar-20 09:59 PM unfortunately i think i need new RS232 transceivers before i can test anything, mine gets boiling hot when i was testing the display without anything hooked up and i think that means they are fakes 10-Mar-20 10:27 PM .-. 10-Mar-20 10:27 PM Yea I just bought Ti transeivers off Arrow I think it was at the time... 10-Mar-20 10:27 PM I don't mess with chinese parts for new designs... 10-Mar-20 10:28 PM @LRM let me know what you get -- i bought some from amazon and they do not work with the 901P -- i assume they're fake 10-Mar-20 10:28 PM I only do for like... one off hacks I build for a project generally 10-Mar-20 10:28 PM Its to avoid frustration and problems like that. I mean some chinese parts are great for cost reduction but you have to carefully choose manufacturer. 10-Mar-20 10:30 PM i got mine on eBay... 5/$2.65 i was pretty sure they would be fakes but was hoping they might be legit heh 10-Mar-20 10:30 PM will probably just order some legit ones from mouser/digikey next time i am ordering stuff 10-Mar-20 10:31 PM ah yea I think I ordered 10 and like I believe I paid that much PER CHIP for the TI chips 10-Mar-20 10:31 PM yeah exactly 10-Mar-20 10:31 PM these might be fun to decap at least 10-Mar-20 10:37 PM i don't mind fakes if they work 11-Mar-20 04:10 AM @samy yep they're pneumatically controlled vacuum valves, earlier today I bought 4 more of the $20 ones with the electrical open/closed feedback switches in them... There are some others on eBay that lack those feedback switches and are $17.50 shipped 11-Mar-20 04:10 AM I've got 2 of the "dumb" feedbackless valves too... But figured for this application it might be smart to ensure the valves were closed before moving on to the next chemical introduction... 12-Mar-20 07:25 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-C0FAB.jpg 12-Mar-20 07:25 PM Never removing that tip detector from my compressor 12-Mar-20 07:25 PM Nobody shall ever tip it 13-Mar-20 03:20 AM lol yea I have a few compressors... it would be mighty difficult to tip... 13-Mar-20 07:13 AM F70L, 100kg 13-Mar-20 07:15 AM <𝓕ermion#6024> what kinda compressor is that? 13-Mar-20 07:15 AM <𝓕ermion#6024> oh it is a pulse tube compressor 13-Mar-20 07:15 AM <𝓕ermion#6024> it's funny I'm so used to only seeing cryomech 13-Mar-20 05:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-A3659.jpg 13-Mar-20 05:59 PM Thankfully the droplet machine from hell was an organ donor 13-Mar-20 06:09 PM (Stole a cryoshield from a recently disassembled toy) 13-Mar-20 08:00 PM what's the copper thing and what's the metal pointy thing? (other than the insinuation in my head) 13-Mar-20 08:35 PM Metal pointy thing is a skimmer with a ~couple of micron sized hole in the tip. Copper is a cryogenic nozzle 13-Mar-20 08:35 PM Cryogenic meaning ~10-20 K here 13-Mar-20 08:35 PM Big picture is that this is the source chamber for a droplet instrument 13-Mar-20 08:50 PM sweet 14-Mar-20 09:09 AM <𝓕ermion#6024> How do you make a few micron sized hole? 14-Mar-20 09:09 AM <𝓕ermion#6024> Does it act like a JT expander? 14-Mar-20 09:23 AM <𝓕ermion#6024> That thing has some pretty beautiful welding 14-Mar-20 09:25 AM This early paper explains it better than I could 14-Mar-20 09:25 AM https://pdfs.semanticscholar.org/45b8/c94745f0de98a449dd126f6cda8b7a43e655.pdf 14-Mar-20 09:25 AM Though I'm not sure if they still make the holes like they did in the late 90s 14-Mar-20 09:40 AM <𝓕ermion#6024> Ah they drew a glass capillary and ground it back. 14-Mar-20 09:40 AM <𝓕ermion#6024> That’s cool. 14-Mar-20 09:41 AM Yeah, I dunno if it's feasible with metals though. I assume it is because I don't know how you would possibly make such a tiny hole otherwise, but ours is definitely full metal 14-Mar-20 10:40 AM Can it just be an aperture? 14-Mar-20 10:40 AM Micron sized metal apertures are pretty easy with a focused ion beam 14-Mar-20 11:01 AM <𝓕ermion#6024> Maybe wire EDM? 14-Mar-20 11:01 AM <𝓕ermion#6024> Like a tap buster but tiny 14-Mar-20 11:34 AM that few micron sized hole is actually 1mm in this case. It's a skimmer from Beam Dynamics http://www.beamdynamicsinc.com/skimmer_specs2.htm 14-Mar-20 11:34 AM and no it must be a skimmer, here is a good source for why: 14-Mar-20 11:34 AM https://sites.google.com/site/evenlavievalve/vacuum-skimmers-etc 14-Mar-20 11:34 AM and yeah that welding was real nice. The guys first time welding copper. The copper is about 2 years old, so not as pretty as when new 14-Mar-20 11:34 AM the "nozzle" for the helium molecular beam is a 5um platinum SEM aperture. We just buy those. 14-Mar-20 12:18 PM What kind of questions are you trying to answer with such research? 14-Mar-20 12:18 PM Or what practical application issues might it help improve or solve roadblocks to? 14-Mar-20 02:47 PM Well which part? Helium droplets are loved because you can get molecules to ground state very easily, my group is mostly interested in studying the “superfluidity” of them 14-Mar-20 03:20 PM They're also very good at isolating ridiculously reactive things. My group makes a living out of that. 14-Mar-20 03:20 PM But they are also of fundamental chemical interest/fundamental interest in general thanks to being very tiny superfluids with some weird properties 14-Mar-20 03:20 PM And the fundamental chemical interest is that you dont necessarily get the gas phase minimum energy structure when you do reactions in them 14-Mar-20 03:44 PM And I guess for a real, practical application of my research, combustion models. Mechanical engineers have these giant models with thousands of reactive intermediates, and the vast majority of the intermediates in these models have never been seen, and their properties are hard to theoretically get right, so these models aren't the most reliable. Our data makes these models slightly less crappy 14-Mar-20 03:44 PM Also astrophysics memes, but that's more fundamental chemical interest in disguise 14-Mar-20 04:00 PM Interesting responses 14-Mar-20 04:00 PM So it's kind of like the selective precision of mass spectrometry, but doing chemistry or physics isolation experiments at the end 14-Mar-20 04:00 PM (re mass spec, Selection in number and type of atoms, anyway) 14-Mar-20 07:25 PM Speaking in terms of my experiments, sort of. The fact that we can use a mass spec as our detector is definitely a pro overall, it's much more sensitive than light detectors could ever hope to be and even with mass selection it can be hard to unambiguously assign peaks to a species thanks to decomposition being so messy, but there are cons there. The biggest being that in traditional spectroscopy your signal IS the transition integrals you get from theory while with our method it's merely proportional to that. That said, mass specs can see densities many orders of magnitude smaller than light based methods, so we can study things that would be thoroughly impossible otherwise, so worth. 14-Mar-20 07:25 PM I'd say the big benefits to helium are A, it's really, really cold so you have narrower peaks thanks to less population in rotational levels 14-Mar-20 07:26 PM I think it's right to say most helium droplet experiments nowadays are chemists "just using them" ? 14-Mar-20 07:28 PM B, it's a less perturbative matrix than other "matrix isolation" techniques which are the main competitors for this kind of highly reactive intermediate spectroscopy. Even compared to para hydrogen which is also very quantum and not particularly perturbative. That said, para hydrogen and the other matrix techniques get data much, much faster and are better choices for actually finding where to look with more sensitive techniques 14-Mar-20 07:28 PM To that point: https://www.ncbi.nlm.nih.gov/pubmed/18629978 14-Mar-20 07:29 PM ...I had a C but I forgot it writing B, rip 14-Mar-20 07:29 PM But to expand on A a bit, I'm speaking about vibrational spectra there, though similar things can be said for electronic spectra and others 14-Mar-20 07:29 PM And I'd say yeah, probably 14-Mar-20 07:29 PM Lemeshko is the only big name I can think of that really, really actually studies the droplets themselves 14-Mar-20 07:29 PM I guess Drabbels is also pretty big and does that 14-Mar-20 07:29 PM And a couple of others 14-Mar-20 07:30 PM we've been trying to 14-Mar-20 07:30 PM Well, that's the thing. It's really, really hard to actually characterize how they work 14-Mar-20 07:30 PM I think I told you before that we have an experiment planned that's more about the emergence of thermalization pathways in droplets as a function of droplet size 14-Mar-20 07:30 PM But who knows if it'll get funded 14-Mar-20 07:30 PM Though I guess you could also say that using them spectroscopically is really, really hard 14-Mar-20 07:30 PM Like, I envy across the hall so much sometimes because their experiment is like 1/3 of the steps 14-Mar-20 07:30 PM For not that much worse spectra 14-Mar-20 07:34 PM In almost all our experiments the difficulty is all in detection 14-Mar-20 07:35 PM Our biggest is light sources and verification that we're actually looking at what we think we're looking at 14-Mar-20 07:35 PM Because all infrared spectroscopy is more or less light source limited 14-Mar-20 07:36 PM We have two separate 1KHz rep rate centrifuges. Nobody liked my idea of getting a 2KHz-capable VMI assembly and doing twice as many experiments on the same droplet machine simultaneously 14-Mar-20 07:38 PM I'm kind of surprised. The densities are so damn low that anything takes forever 14-Mar-20 07:38 PM So doubling that seems very, very worthwhile 14-Mar-20 07:39 PM The other student was combining said 1Khz centrifuge with a 50Hz dye laser for REMPI... So.... 14-Mar-20 07:40 PM God I hope my VUV actually works 14-Mar-20 07:40 PM Because REMPI is a curveball I don't want to add to the experiment 14-Mar-20 07:40 PM Also hope that beam quality isn't super important for that conversion because anything but a parabolic mirror isn't viable for focusing for the conversion, and I've heard that parabolic mirrors are more than a little bit of a pain if beam quality is important 16-Mar-20 09:07 AM I found some deuterium lamps that have numbers like "2647 hours" and "5413 hours" on them. Definitely dead? 16-Mar-20 09:07 AM One more that says "1913 hours" 16-Mar-20 12:07 PM have seen 1k to 2k hours quoted for lifetimes, but depending on your needs maybe they're still useful 16-Mar-20 10:26 PM random old ion gauge controller in ewaste 16-Mar-20 10:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_9964-1EFE0.JPG 16-Mar-20 10:26 PM nixies 16-Mar-20 10:26 PM here's a decent photo of the inside of one of our VMI ToF chambers 16-Mar-20 10:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_9413-C9D9A.JPG 16-Mar-20 10:26 PM for some reason someone decided sheathing the 5kV and 3kV wires together made sense? 17-Mar-20 07:45 AM Well I just got these in the mail: https://www.ebay.com/itm/High-vacuum-traps-and-clamps/202924544023 One of those things I threw the minimum bid on and just kinda forgot about lol. I think I'll be set on traps now though! 17-Mar-20 07:45 AM Although an unfortunate packaging choice was to cover the ports in duct tape... Luckily it hasn't left much residue behind but yea :/ 17-Mar-20 07:45 AM The one NW clamp in this lot of stuff is MASSIVE though 17-Mar-20 09:05 AM Is that... a spring-loaded KF50 clamp? 17-Mar-20 09:39 AM its way bigger than KF50 17-Mar-20 09:39 AM lol 17-Mar-20 09:39 AM I have KF40/50 stuff 17-Mar-20 09:39 AM that thing is like KF80 or whatever is larger than 50 17-Mar-20 09:39 AM I didn't know there was larger than 50 but that thing is BIG 17-Mar-20 09:39 AM Also OTHER new toy arrived 17-Mar-20 09:39 AM https://media.discordapp.net/attachments/529468991652233216/689510180572102668/DSC_3050.JPG 17-Mar-20 10:10 AM I hate the big spring loaded clamps 17-Mar-20 11:01 AM @Conmega nice lot 17-Mar-20 10:24 PM photos are a bit worse than i realized when doing a quick test but in person it looks great. https://i.gyazo.com/612e4e74437db2f278565db6b8380c39.jpg + https://i.gyazo.com/4089b8675501d64eea0fe9eceddad2fc.jpg 17-Mar-20 10:24 PM need to come up with a slightly different setup for the piezo out (forgot it was differential from the absolute pressure) and 3d print a case 20-Mar-20 04:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200320_024422-F8842.jpg 20-Mar-20 04:23 AM Hot glued some sandpaper onto the end of a pencil, and threw that into my drill to try and sand out the scratches in the scroll pump gasket face 20-Mar-20 04:23 AM But it seems the sand paper didn't like the speed or constant rotary motion, and was dulling quite fast 20-Mar-20 04:23 AM The whetstone I cut down with a dremel cutoff wheel was too high grit for this amount of scratching in the gasket face 20-Mar-20 04:23 AM Ended up ordering these diamond coated rotary bits which are 200 grit and seem like pretty much exactly the width of the scroll space 20-Mar-20 04:23 AM https://www.amazon.com/gp/aw/d/B07D9G335H/ 20-Mar-20 04:23 AM Also ordered a set of corundum files/whetstone pieces that range in grit, but again I'll have to manually cut them up 20-Mar-20 04:23 AM And glue them I guess to one of those rotary shanks 20-Mar-20 04:23 AM Hopefully the shanks are long enough! 20-Mar-20 07:32 AM Lol I’ve put sand paper on a drill many times before 20-Mar-20 10:30 AM just make triple sure you have gotten all of the sandpaper grit out of there before those seals go anywhere near it 20-Mar-20 10:30 AM would really suck to do all the work fixing it up for nothing 20-Mar-20 10:50 AM You're supposed to bake the scrolls aren't you? 20-Mar-20 10:50 AM Or rather 20-Mar-20 10:50 AM some undergrads in my lab were repairing one of these 20-Mar-20 10:50 AM and at one point built an oven to bake something 20-Mar-20 11:07 AM Well I do have a bio incubator large enough to hold it, so I can definitely do a long soft bake if needed 26-Mar-20 12:12 PM Back in 2015 I made laser-synthesized nanoparticles by blasting bulk silver in water with a q-switched laser through a galvo scanhead. The colloid solution relied completely on electrostatic repulsion for stability, which only lasted for a few hours. Most of the particles agglomerated and fell to the bottom of test tube. However, 5 years later the solution has still been orange-brown colored, presumably from the more stable particles remaining colloidal. Yesterday I resuspended everything in the tube with an ultrasonic bath and then diluted some of the solution with alcohol and applied to an SEM stub with carbon tape. It was hard to find the nanoparticles (diluted too much?) but I think I found something... 26-Mar-20 12:12 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200326.000051-E8FA6.jpg 26-Mar-20 12:12 PM I think what I'm seeing is the larger agglomerated particles that I resuspended, covered in the much smaller particles that remained stable. But I'm pretty much a n00b with this stuff. 26-Mar-20 12:46 PM Note, my desktop SEM has a max claimed resolution of 25nm, so this is pretty close to the limit of its magnification. 26-Mar-20 02:36 PM Well, did you dilute all the stock solution? 26-Mar-20 02:36 PM I'd try some full strength before doing a few serial dilutions 26-Mar-20 02:38 PM I have like 50mL of the solution, so I can try it again less diluted. Maybe I'll also add it multiple times to the stub, drying in between applications 27-Mar-20 11:23 AM things! 27-Mar-20 11:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200326_195952-4B820.jpg 27-Mar-20 11:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200326_204612-383AD.jpg 27-Mar-20 11:23 AM my variac got a case 27-Mar-20 11:23 AM (not done yet, still waiting for some parts) 27-Mar-20 11:23 AM I abused it 27-Mar-20 11:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200327_164520-67723.jpg 27-Mar-20 11:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200327_180350-14C23.jpg 27-Mar-20 11:23 AM made some things glow with it 27-Mar-20 11:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200327_184707-C95BD.jpg 27-Mar-20 11:23 AM to make them easier to install 27-Mar-20 11:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200327_191126-6ED5C.jpg 27-Mar-20 11:23 AM in this beast of an oven 27-Mar-20 11:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200327_192129-7C89E.jpg 27-Mar-20 11:23 AM to achieve the ideal pizza 27-Mar-20 11:23 AM or something along those lines 27-Mar-20 11:37 AM I love toroidal solenoids 27-Mar-20 11:37 AM The ultimate sneaky “bet you didn’t think this theory would be relevant in real life eh?” 27-Mar-20 11:40 AM XD 27-Mar-20 11:47 AM I was super dissapointed when I learned about tunnel diodes 27-Mar-20 11:47 AM "WOW that's so bizarre, simple, and quantum!" "Oh, they're practically useless." 27-Mar-20 11:47 AM But toroids pop up everywhere 27-Mar-20 11:48 AM ? 27-Mar-20 11:48 AM They are quite useful, we just have a lot of circuits and chips that can do what they did faster/better/more power efficient/etc nowadays 27-Mar-20 11:48 AM thats why they went the way of the dodo 27-Mar-20 11:48 AM jack of 1 trade master of none 27-Mar-20 11:48 AM sounds practically useless to me 27-Mar-20 11:49 AM Fun. I’ve been playing around with an Omega industrial PID controller that I found in some scrapped electronics. 27-Mar-20 11:49 AM The plan was to use it to control heat tape for baking out a HPGe 27-Mar-20 11:50 AM ??? this isn't the 1960s so like not many people know what they are useful for now. But I know they were used EXTENSIVELY in triggering circuitry/edge sharpening/etc 27-Mar-20 11:50 AM but I think they had quite a fair number of neat uses back when other forms of silicon were slow, tunnel diodes got into the multi GHz speeds 27-Mar-20 11:50 AM you can make little oscillators with them too was another one 27-Mar-20 11:51 AM I imagine something like that would be very useful in the oven to... cook your pizza... at a constant temperature. 27-Mar-20 11:51 AM that's 3 I can come up with off the top of my head and I only know what I know from like 5 minutes of google. If you pick up a book published in the 70s you would probably find a whole lot more 27-Mar-20 11:51 AM again they just kinda died out and haven't been produced since the early 80s maybe at the latest? 27-Mar-20 11:51 AM unless there is some government contract where one company still makes them I don't think they have been made in over 40 years... 27-Mar-20 11:51 AM so they are useless because you can't source them really, not because they don't have a bunch of applications 27-Mar-20 11:53 AM Ok perhaps useless is the wrong word then, but still I wish I had discovered them and then found out they were everywhere 27-Mar-20 11:54 AM And again, other things have replaced them. 27-Mar-20 11:54 AM toroids live on 27-Mar-20 11:54 AM Tunnel Diodes are like vacuum tubes. 27-Mar-20 11:54 AM haven't been made in a long while except for maybe some special applications, and its not like they didn't have use, they just have been replaced 27-Mar-20 11:57 AM more like one very specific model of vacuum tube I guess, but sure 27-Mar-20 11:57 AM not useless just not a nice 2020 device 27-Mar-20 12:55 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200327_204942-D4042.jpg 27-Mar-20 12:55 PM spot on 10 amps at 230 V 27-Mar-20 12:55 PM that went better than expected 27-Mar-20 01:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-81F15.png 27-Mar-20 01:08 PM I want to put pizza in it 27-Mar-20 01:10 PM maybe wait a bit until I have installed a controller 27-Mar-20 01:11 PM my parents discovered their oven on broiler can burn bread in 7 seconds 27-Mar-20 01:13 PM XD 27-Mar-20 01:13 PM https://youtu.be/Vt5HepYNpGw 27-Mar-20 01:47 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200327_214237-5EB73.jpg 27-Mar-20 01:47 PM and the controller works as well! 27-Mar-20 01:48 PM @nmz787 the plasma in a grape thing is real cool. Refractive index of a grape makes it pretty close to a resonant cavity for typical microwave ovens 27-Mar-20 01:49 PM Lol, too bad I'm not in a go to the store mood 27-Mar-20 01:56 PM Oooh, you’ve got a ramp/soak controller? Nice. 27-Mar-20 02:01 PM ramp up, soak, but not ramp down 27-Mar-20 02:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-029A1.png 27-Mar-20 02:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-9B1D0.png 27-Mar-20 02:33 PM ding ding ding 27-Mar-20 02:33 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-FFA0F.png 27-Mar-20 02:34 PM How hot does an oven have to be to be able to gently toss a hot dog through it and have it cook? 27-Mar-20 02:34 PM depends on how long it is 27-Mar-20 02:35 PM 0.25m^3 27-Mar-20 02:35 PM that feels like a reasonable size for an oven? 27-Mar-20 02:43 PM oh boi 27-Mar-20 02:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-09ED0.png 27-Mar-20 02:43 PM 0.25m^3 @idmb Depends on what you're doing, but yeah, that's pretty big 27-Mar-20 02:45 PM Also forgive me if I posted this already, just going through my SD card of lab photos now. All the viewports we tried were messing with our polarization.... So we did what any sane person would do 27-Mar-20 02:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_3677_copy-184F3.JPG 27-Mar-20 02:58 PM that's one nice looking thingie 27-Mar-20 03:08 PM which part? 27-Mar-20 03:09 PM yes 27-Mar-20 03:09 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screen_Shot_2020-03-27_at_3.08.26_PM-9AD02.png 27-Mar-20 03:09 PM this is what's directed into the chamber 27-Mar-20 03:09 PM we needed to average polarizations 27-Mar-20 03:09 PM and all our fancy rotation mounts were in use 27-Mar-20 07:34 PM @idmb nice! what optical things are you doing? 27-Mar-20 07:44 PM that's trying to measure how an ensemble of molecules spinning very fast rotates a linearly polarized beam that passes through it 27-Mar-20 10:07 PM @GigaSquirrel how hot does the oven get? 27-Mar-20 11:16 PM It took me a second to realize that this was degrees C not F.... 27-Mar-20 11:16 PM That would cook a pizza pretty darn fast. 27-Mar-20 11:36 PM mmm, blue rare pizza 28-Mar-20 02:23 AM @piGuy I'm stopping at 1200, not sure how much more the kanthal would take 28-Mar-20 04:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200328_120821-C71CB.jpg 28-Mar-20 04:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200328_120807-BB27C.jpg 28-Mar-20 04:22 AM let's try melting some copper! 28-Mar-20 05:02 AM we're at above 1100°C, so it should be molten by now 28-Mar-20 05:02 AM gonna let it get up to its 1200 and keep it there for an hour or so 28-Mar-20 05:02 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200328_125711-4D552.jpg 28-Mar-20 11:12 AM https://twitter.com/GigaBecquerel/status/1243964076599980032 28-Mar-20 11:37 AM nice! what oven is that? 28-Mar-20 11:40 AM semi-diy 28-Mar-20 11:40 AM Nabertherm B180 controller on an oven that originally had 9 kW SiC heaters 28-Mar-20 11:40 AM I rewired it for single phase and 2.5 kW kanthal 28-Mar-20 11:49 AM I just did something similar to this. 28-Mar-20 11:49 AM Melting bronze 28-Mar-20 11:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-F1534.jpg 28-Mar-20 11:49 AM Vacuum investment flasks in the burnout kiln. 28-Mar-20 11:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-AA4F3.jpg 28-Mar-20 11:50 AM nice! 28-Mar-20 11:50 AM Ready to cast 28-Mar-20 11:50 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-84891.jpg 28-Mar-20 11:51 AM ohhh very nice! 28-Mar-20 11:51 AM Pouring.... 28-Mar-20 11:51 AM https://youtu.be/kiMOFHGlbEQ 28-Mar-20 11:53 AM What's the fluffy cruddy looking stuff at the top of that door? 28-Mar-20 11:53 AM It kind of looks like it would fall and contaminate the metal pool 28-Mar-20 11:53 AM I’m not sure, might be flux. 28-Mar-20 11:53 AM Hmm 28-Mar-20 11:53 AM So purposely put there? 28-Mar-20 11:54 AM I’m not the expert on this. First time I did a bronze pour. This is the makerspace’s equipment. 28-Mar-20 12:09 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200328_200630-A702B.jpg 28-Mar-20 12:09 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200328_200639-ADFF2.jpg 28-Mar-20 12:09 PM sooo pretty 28-Mar-20 12:13 PM What metal is that? 28-Mar-20 12:13 PM copper 28-Mar-20 12:15 PM slag/flux on top? 28-Mar-20 12:15 PM yep, I just used borax 30-Mar-20 09:38 AM https://twitter.com/GigaBecquerel/status/1244661369200394240 30-Mar-20 09:42 AM your welds are just the colour of duct tape 30-Mar-20 09:42 AM had me second-guessing 30-Mar-20 09:43 AM XD 30-Mar-20 09:43 AM didn't clean the metal properly 30-Mar-20 09:43 AM and didn't treat the welds afterwards 30-Mar-20 09:43 AM No matter what I do I can't get our mech shop (whom we pay by the hour) to stop cleaning their welds 30-Mar-20 09:43 AM I wonder why XD 30-Mar-20 09:44 AM they don't get paid extra 30-Mar-20 09:44 AM they're just bored 30-Mar-20 09:45 AM yeah but it takes time 31-Mar-20 05:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200331_130141-C9275.jpg 31-Mar-20 05:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200331_130240-5560F.jpg 31-Mar-20 05:27 AM I did not expect it to smell that bad 31-Mar-20 05:27 AM but hey 31-Mar-20 05:27 AM keeps my neighbours inside 31-Mar-20 07:31 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200331_161815-E5C0A.jpg 31-Mar-20 07:31 AM not ideal, but it's holding together 31-Mar-20 07:57 AM My gamma and alpha spectroscopy gear. 31-Mar-20 07:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-7E2BD.jpg 31-Mar-20 07:57 AM I was showing this to someone else online in response to the antimatter video making its rounds. 31-Mar-20 07:59 AM Nice! 31-Mar-20 07:59 AM I have a SpecTech UCS-20 MCA, but I’ve been using my Canberra AIM + ADC with EPICS. 31-Mar-20 07:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-230F9.jpg 31-Mar-20 07:59 AM This was a steal. I saw this in an unidentified misc lot at a medical auction 31-Mar-20 07:59 AM I think we got it for $10 31-Mar-20 07:59 AM It is a well type NaI scint, a lead castle for it, and a SCA / scaler that is very clearly designed for the medical industry. 31-Mar-20 07:59 AM Designed for radioimmunoassay. It uses an XLR for pre-amp and signal power. I’ve never seen that. Again, proprietary medical. 31-Mar-20 07:59 AM It was a misc lot, so we also received a whole bunch of surgical kits to repair hernias. Given how heavy that lead is, we might need them. 31-Mar-20 07:59 AM My plan is to rebuild the preamp so I can use it with my NIM crate. I can use it now, but I have to set it on its side because the base mounted preamp I have will stick out the bottom. 31-Mar-20 07:59 AM My HPGe getting pumped and baked. 31-Mar-20 07:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-95685.jpg 31-Mar-20 08:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200331_170753-9BDF5.jpg 31-Mar-20 08:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200331_171154-C2CB2.jpg 31-Mar-20 08:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200331_171203-97DB0.jpg 31-Mar-20 08:14 AM this went so much better than expected 31-Mar-20 08:16 AM Ooh, what is that part? What metal? 31-Mar-20 08:51 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200331_174749-73D56.jpg 31-Mar-20 08:51 AM it's a replacement nut for our garden table 31-Mar-20 08:51 AM and some unknown Al scrap 31-Mar-20 09:17 AM looks great! 31-Mar-20 09:17 AM also that is a very nice spectroscopy set up...pretty envious of that NaI for $10! 31-Mar-20 09:43 AM Thanks! That was an awesome find. It was a pallet wrapped rack of assorted, uncategorized junk. As soon as I realized there were scints in there, I knew it was worth bidding on. I also got a second well scint, but the crystal was severely cracked with water damage and the PMT had shattered in its housing. 31-Mar-20 09:43 AM Still, that made for an interesting tear down video, and I use the scint and the guts of the PMT to show people how it works. 31-Mar-20 09:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_0012-18B25.jpg 31-Mar-20 09:43 AM Medical instrument makers are weird. 31-Mar-20 09:43 AM That one used a UHF connector for HV to the PMT. 31-Mar-20 09:54 AM And... you never know when a posterior hernia repair kit might come in handy. 31-Mar-20 10:11 AM UHF stuff is used for high voltage all the time, and high voltage stuff is used for UHF/RF stuff all the time 31-Mar-20 10:11 AM the cheapest local source for MHV connectors was a marine supply store 31-Mar-20 10:11 AM for radios 31-Mar-20 10:16 AM Why was MHV being used for radios? 31-Mar-20 10:19 AM I have no idea 31-Mar-20 10:19 AM Maybe they weren't, and they had just bought a ton of miscellaneous connectors thinking they looked good for radio 31-Mar-20 10:22 AM that poor pmt/crystal :v 31-Mar-20 10:31 AM Might have bought MHV as it looks like BNC or as "High Voltage BNC" and Higher = Better 31-Mar-20 10:31 AM And then sold it at 50usd/pcs to Yachers as special high power BNC connectors. 31-Mar-20 10:32 AM And then they get complaints because “the connector broke and I couldn’t remove it” 31-Mar-20 12:53 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200331_1211302-2BB83.jpg 31-Mar-20 12:53 PM bit of a messy pic of my alpha/gamma spectroscopy setup.. currently wrestling with every amp and SCA i have to find the one with the least timing walk for a later coincidence experiment 31-Mar-20 12:57 PM ohh! 31-Mar-20 12:57 PM heh, think we got the same function generator 31-Mar-20 12:57 PM (and alpha spectrometer :P) 31-Mar-20 12:58 PM siglent sdg1025? yeah :D 31-Mar-20 12:58 PM Yeah! 31-Mar-20 12:58 PM cute little thing, got it in exchange against a 100 MHz pulse generator 31-Mar-20 12:58 PM also HP 5554A spotted 31-Mar-20 01:00 PM oh nice; mine was actually an 'oops i accidentally bought two of these here have one' gift 31-Mar-20 01:00 PM along with that panasonic oscilloscope 31-Mar-20 01:00 PM also yep :D the detector in the lead background shield at the bottom is an HP 10615A PMT base with an RCA 8054 and that little .. 40mm? NaI crystal 3d-printer-shimmed onto it 31-Mar-20 01:00 PM going into the Canberra System 35+ MCA, the tennelec SCA, the oscilloscope, and the pulse stretcher -- currently the SCA triggers the scope on the output of the amps/pulse stretcher. i have a bunch of baseline ringing because i think i have all kinds of impedance mismatched weirdness.. lot of this stuff really wants 93 ohm termination 31-Mar-20 01:03 PM sweet 31-Mar-20 01:03 PM 40mm, little, sure 31-Mar-20 01:03 PM So that's why there's 93ohm coax being made! 31-Mar-20 01:03 PM I really like that MCA, looks so sciency ❤️ 31-Mar-20 01:03 PM And also why I have 10meters of it somewhere 31-Mar-20 01:03 PM 93 ohm coax has the lowest capacitance per foot afaik 31-Mar-20 01:04 PM Makes sense, as there's a larger distance between the center conductor and shield. 31-Mar-20 01:04 PM and is really fast 31-Mar-20 01:04 PM It's also good for weird matching sections. 31-Mar-20 01:04 PM Ain't that speed more about the dielectric used? 31-Mar-20 01:04 PM no Idea tbh 31-Mar-20 01:05 PM with foam being 0.86-0.88 vf and solid PE being 0.66? 31-Mar-20 01:05 PM but I know rg62 has 0.85 31-Mar-20 01:05 PM Thought it was dielectric related 31-Mar-20 01:05 PM the MCA is my favorite thing.. i'm so happy it works, and that i finally got raw data readout into a computer. rip snortin' 100 MHz Wilkinson ADC, can measure the amplitude jitter in my siglent's pulse function with it.. heh 31-Mar-20 01:05 PM If it has foam dielectric. But dunno if solid dielectric rg62 is made. 31-Mar-20 01:06 PM but rg62 is rg62? They should have no difference between each other and if so they should get another name? 31-Mar-20 01:06 PM Only if it is "MIL-C RG-62" 31-Mar-20 01:06 PM Wouldn’t that be nice 31-Mar-20 01:06 PM not "RG-62" or "RG-62 type" 31-Mar-20 01:06 PM As there is really not any standards for "RG-something"-coax anymore 31-Mar-20 01:06 PM MIL-C refers to the old military standards that spawned the RG- cables. 31-Mar-20 01:06 PM For example there's tons of absolute garbage quality "RG-58" out there 31-Mar-20 01:06 PM And in any case one should use the datasheet from the particular manufacturer who makes the coax you are using. 31-Mar-20 01:09 PM hm 31-Mar-20 01:09 PM As there IS variation between manufacturers. 31-Mar-20 01:09 PM then what are the standards for 31-Mar-20 01:09 PM Approximate mechanical dimensions 31-Mar-20 01:09 PM And it's only "standard" if it's MIL-C 31-Mar-20 01:09 PM Or should be anyway 31-Mar-20 01:09 PM bleh 31-Mar-20 01:09 PM As you can print whatever you want on it. 31-Mar-20 01:10 PM For example there's tons of absolute garbage quality "RG-58" out there I’ve got two “rg-58” jumpers, once’s 6 feet and ones 20. The loss through the 6 foot one is significantly higher. 31-Mar-20 01:10 PM So RG-58 connectors usually fit the RG-58 you have 31-Mar-20 01:10 PM @Addison-110m Is the worse one just twin lead in round plastic? 31-Mar-20 01:10 PM --> #off-topic-thats-sometimes-on-topic 31-Mar-20 01:10 PM Like some of the cheap "RG-58" BNC patch cables made for CCTV applications are? 31-Mar-20 03:17 PM Just bought this RF auto matcher and what looks to be capacitively or inductively coupled bell jar chamber 31-Mar-20 03:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/158569306674353959128304093265-C72CB.jpg 31-Mar-20 03:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/15856930831839072676017594034442-89146.jpg 31-Mar-20 03:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/15856930931195710857280340518676-1EE19.jpg 31-Mar-20 03:17 PM Finally got the manual from the company after 10 days of emailing and calling them. It's in Japanese. Best way to read seemed to be displaying on my desk screen and using Google Translate in camera mode. 31-Mar-20 03:19 PM Wow the internals of that are beautiful 31-Mar-20 03:19 PM if they had done the wiring nicer it would be a top 10 for me 31-Mar-20 03:19 PM but alas rainbow bundles zip tied are too easy 31-Mar-20 03:21 PM It runs 100VAC tho... I have a few spares on my FIB power cabinet, and a variac 31-Mar-20 03:21 PM Idk if I wanna plug plasma RF stuff into my FIB power circuit tho 31-Mar-20 03:21 PM The generator takes 220 I think 31-Mar-20 03:21 PM Sooo, if anyone has recommendations for power level distribution, some sort of existing surplus item that are plentiful but I don't know search keywords? 31-Mar-20 03:21 PM I.e. a nice big transformer with multiple taps, plugs, a rack mount size, etc... 31-Mar-20 03:21 PM Gotta get me a server rack now! 31-Mar-20 03:25 PM Variac should do fine if you have a spare. 31-Mar-20 03:25 PM Hopefully I can get that chamber to glow with minimal work 31-Mar-20 03:25 PM Plug and chug after the power is sorted out 01-Apr-20 10:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200401_193837-99695.jpg 01-Apr-20 10:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200401_194142-9F991.jpg 01-Apr-20 10:49 AM attempt #2 looking better 01-Apr-20 10:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200401_194841-D45EA.jpg 01-Apr-20 10:49 AM also, moon 01-Apr-20 11:05 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200401_200236-8E956.jpg 01-Apr-20 11:05 AM it's got some inclusions, but this time it's shiny! 01-Apr-20 04:29 PM https://photos.app.goo.gl/Muo4j6LBEG7uaunV7 01-Apr-20 04:29 PM https://photos.app.goo.gl/AzQcT6EqziPvC9u47 01-Apr-20 04:29 PM Finally buttoned it up and am letting it run in after a partial rebuild. Nice and smooth and quiet <3 01-Apr-20 04:29 PM That pressure is like very shortly after power on and full open ballast. 01-Apr-20 04:29 PM Will get an ultimate pressure reading after its been running for awhile. 01-Apr-20 04:32 PM nice! what pump? what's the driving board 01-Apr-20 04:35 PM Leybold D2A The controller board is for the vacuum gauge. Its the board I designed... I need to get back to polishing up the code and interface for that and actually start selling them... 01-Apr-20 04:35 PM I also need to write the code to test the ADC for the Activeline gauge connection I added. 01-Apr-20 04:40 PM Nice! I also found getting to 10-2 pretty much right after turning on the rough pump with the gauge connected directly 01-Apr-20 08:15 PM Cool immediate 6x10-3 with closing of the ballast than after some time it got down to 2x10-3 01-Apr-20 08:15 PM I'd call that happy 01-Apr-20 08:21 PM sounds like it's working as it should 01-Apr-20 08:21 PM :p 01-Apr-20 08:47 PM Yup, again wasn't a full rebuild, just a 100~ dollar partial rebuild. So quite happy. 01-Apr-20 11:52 PM Very nice! 02-Apr-20 04:15 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200402_131241-FDD4A.jpg 02-Apr-20 04:15 AM fixed the hole with high temp plaster 02-Apr-20 04:15 AM now I have to wait for a loooong time 02-Apr-20 04:15 AM two days! 02-Apr-20 09:45 AM I was going to say.... the bottom of your furnace didn’t look too happy. 02-Apr-20 10:01 PM https://media.discordapp.net/attachments/529468991652233216/695493304891998268/DSC_3113.JPG 02-Apr-20 10:01 PM Woot, made a disk for the 4145B and it comes up and seems to pass self test. 02-Apr-20 10:01 PM Also the LCD replacement for the vector screen is REALLY nice. 02-Apr-20 10:01 PM I have a bid in on some of the weird EXPENSIVE triax cables I need for this thing... 02-Apr-20 10:01 PM Also made an offer on whats hopefully the test fixture and modules for it 02-Apr-20 10:12 PM I also "need" a triax... Amazon has some for what seemed to be an OK price for new 02-Apr-20 10:12 PM "need" as in, I've had this electrometer for a few years and never used it 02-Apr-20 10:33 PM lol amazon? 02-Apr-20 10:33 PM I don't see any on amazon at all 02-Apr-20 10:33 PM and most of these cables are like... 100+ a pop new... 02-Apr-20 10:33 PM even used on ebay so far I've only seen about 30-40 bucks a pop for sane lengths... 02-Apr-20 10:33 PM like 3ft+ 03-Apr-20 05:01 AM doing a slow bakeout on the oven 03-Apr-20 05:01 AM 100°C per hour up to 1200 03-Apr-20 05:01 AM that should dry and sinter the plaster properly 03-Apr-20 03:53 PM @Conmega https://www.amazon.com/gp/aw/d/B005T903IQ/ 03-Apr-20 03:53 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/1585954439272706819923489593734-A5635.jpg 03-Apr-20 03:53 PM Yeah 3ft... The price is definitely such that I haven't impulse bought it 03-Apr-20 05:19 PM I think I found one on eBay for a lot less.... I was considering using a Keithley electrometer. 03-Apr-20 05:54 PM oh those pamonas, yea those are cool but also not what I want... I want end to end triaxial for using the official HP test fixture OR making my own... Having a consistent impedance on the cable would be nice too. Although I am not sure how impedance plays out with this equipment yet. 03-Apr-20 09:58 PM Cable impedance isn't much to consider with these cables if you're using a 4145, your driven guard only has a bandwidth of << a few MHz and the analyzer a settling time of ~10ms IIRC. RF- uses of triax almost never have guards; low leakage guard buffers almost always have crap bandwidths. Envious of the LCD btw, looks way better than the washed out old crt's! The measurement box is btw very nice (source, I have one), but it really doesn't contain much, doesn't have too much extra room and is only really suitable for prepackaged devices. If you get it cheap AND along with several connection plates it's still worth it. If you're however planning to do any proper probing or use additional signal/power feeds in the future it's better to just make yourself from the get-go. 03-Apr-20 10:17 PM Yea, I am keeping an eye out on eBay for the measurement box and the case of accessory inserts for less than 200~ bucks or so... But yea I saw photos its pretty empty just connections. And thanks for the confirmation. That's what I assumed from my understanding of things. I just don't like to accept my own assumptions before I have a confirmation from someone else :) 03-Apr-20 10:17 PM But yea these triax cables I have seen in tons of impedances. 50/78/100/124 ohm respectively to name a few... I have a bid out on some 50 ohm cables because well 50 ohms is pretty standard for other stuff too and so should prove useful for any other possible future stuff I may use the cables with. 03-Apr-20 10:48 PM Yeah, the mil-1553 and broadcast- people really use some screwed up signalling at times. I've mostly been making my own cables, used to use some cheap PE-foam broadcast triax from belden, and as long as there was no vibration or movement on the cable it was fine. Rather big and bulky however, and then I found a whole coil of partially lubricated teflon insulated cable in the uni e-waste. Muuuuch better to work with, kind of nice to know you can move your cable without having to shunt it or wait for it to settle for ages. 03-Apr-20 10:50 PM heh yea no kidding... 03-Apr-20 11:04 PM What are you planning to use the SCPA for? Homegrown film and maybe transistor characterization, or more analog electronics? 03-Apr-20 11:14 PM homebrew transistors/chips but I also repair vintage computers and sometimes I am stuck with a house numbered transistor or something that I have no idea what the original spec was... so it'll be a useful tool for characterizing old parts. 03-Apr-20 11:32 PM I see! Quite similar to my intended use then, sadly haven't gotten mine operational yet however. An 4145A in my case with a dead 5 1⁄4-inch drive that seized up, a dead power supply and damage on most of the SMU-boards. Should get back on it someday soon though, would be real nice to have for an upcoming NbN- related project. 04-Apr-20 12:01 AM ah... if its that badly damaged... I'd just consider getting another... 4145A/Bs are like... <300 dollars a pop all day long... Now if you want a 4155/56? prepare to burn a credit card... 04-Apr-20 12:01 AM Ultimately if you get another and you have the damaged 4145 you at-least have a parts unit 04-Apr-20 12:30 AM Very true, they are rather cheap. Though prices have gone up quite a bit over the past few years. 04-Apr-20 12:33 AM really? I thought they had gone down a bit, or at-least gotten more common on the second hand market... the 4145s anyway... those were quite desirable for awhile but I think most places are moving to 4155s and such as they can since its probably got slightly better support 04-Apr-20 01:25 AM A couple years ago you could easily get a 4145B for under 150$, I vaguely remember also seeing a really busted up 4155 at ~800$. Every time I've looked back they've gone up. I think there was maybe a surplus of them because most listings just wouldn't sell for months and nobody in the DIY-community used them. I think neither of those are as true cases today, quite a lot of electronics youtubers have at least offhand showed them off in the last year or two. 04-Apr-20 01:26 AM hrm interesting 04-Apr-20 01:29 AM I have only been interested in the DIY semiconductor scene for a bit over a year now, but it does seem like it's still in it's infancy and growing quite fast. People like us are the first ones to grab these instruments, so maybe a correlation? 04-Apr-20 01:35 AM Nah we are far from the first to grab this equipment... Remember there are still plenty of fabs and research places running this old equipment... 04-Apr-20 01:35 AM It works... It still works very well. 04-Apr-20 01:35 AM I have a friend who maintains a fab line for like postage stamp sized 2K oled screens with built in controllers... 04-Apr-20 01:35 AM And well... thats like a 1980s fab line with newer optics. 04-Apr-20 04:01 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200404_124952-23A94.jpg 04-Apr-20 04:01 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200404_125015-D52EF.jpg 04-Apr-20 04:01 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200404_125900-97466.jpg 04-Apr-20 04:01 AM non ideal sprue placement, but it might work 04-Apr-20 04:24 AM :) 04-Apr-20 08:13 AM That’s a lot of work casting and then machining the faces. Even at that size, I see plenty of KF adapters on eBay for not that much money. Any reason why you are casting this? 04-Apr-20 08:14 AM I just assumed it was a "for fun to see what I can do with my casting methods" type thing... 04-Apr-20 08:14 AM ^ this 04-Apr-20 08:15 AM I mean I don't plan to make chips/transistors at home because I think it will be cheaper or easier than... I dunno... buying them? 04-Apr-20 08:15 AM Well OK, have fun.... 04-Apr-20 08:15 AM thanks, I am 04-Apr-20 08:15 AM Yea I can't wait to see how that turns out 04-Apr-20 08:16 AM I'm bored and want to practice casting, but I don't need anything at the moment where casing would help in any way 04-Apr-20 08:16 AM and the adapters were the first thing that came to mind 04-Apr-20 08:16 AM Ok, I can relate to that. 04-Apr-20 08:16 AM you can ALWAYS use KF adapters... 04-Apr-20 08:16 AM right 04-Apr-20 08:16 AM I know I need more 04-Apr-20 08:16 AM go make your own 04-Apr-20 08:16 AM lol 04-Apr-20 08:17 AM I also thought about ordering some clay and glazing 04-Apr-20 08:17 AM mmmmmm glazing 04-Apr-20 08:17 AM oh wait different glazing :) 04-Apr-20 08:18 AM see if I can make some insulators and fuse some metal to the glazing 04-Apr-20 08:18 AM that would be cool 04-Apr-20 08:18 AM different kind of glazing for stuff from a different kind of oven 04-Apr-20 08:18 AM hehehe 04-Apr-20 08:18 AM that would be really cool, making my own high voltage feedthroughs 04-Apr-20 08:18 AM those things are just not available on ebay.de 04-Apr-20 08:18 AM and shipping from the usa kills most deals 04-Apr-20 08:20 AM yea.. thats something that would be worth the time and effort considering the new prices and rarity of them on ebay for cheap 04-Apr-20 08:21 AM but I have exactly zero knowledge about pottery, glazing and metal to glass seals 04-Apr-20 08:21 AM magic 04-Apr-20 08:21 AM I'm not even sure if glazing is done with glass 04-Apr-20 08:22 AM don't believe so, just ceramics? 04-Apr-20 08:22 AM at-least I would think so 04-Apr-20 08:22 AM see 04-Apr-20 08:22 AM goddamnit 04-Apr-20 08:22 AM for some stupid reason the german language uses the same exact word for "clay" and "sound" 04-Apr-20 08:23 AM .-. 04-Apr-20 08:24 AM and if I look for metal to clay / pottery connections all I find is stuff on the sound of instruments made from metal, how they play together XD 04-Apr-20 08:24 AM you just gotta love this language 04-Apr-20 08:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-A960F.png 04-Apr-20 08:27 AM Yea I just can't even 04-Apr-20 08:27 AM lol 04-Apr-20 08:27 AM but also... so like 04-Apr-20 08:27 AM for vacuum tubes for example 04-Apr-20 08:27 AM squeezing the glass down around the metal is enough... 04-Apr-20 08:27 AM its the other way around that's fun... 04-Apr-20 08:27 AM the wiki on glass to metal seals seems like a decent starting point? 04-Apr-20 08:27 AM https://en.wikipedia.org/wiki/Glass-to-metal_seal 04-Apr-20 08:27 AM I assume you've probably been there before though... 04-Apr-20 08:27 AM it talks about different metals and such 04-Apr-20 08:30 AM that looks really decent actually 04-Apr-20 08:30 AM thanks ^^ 04-Apr-20 08:30 AM now I actually have to put thought into the stuff I'm doing 04-Apr-20 08:30 AM man what have we come to 04-Apr-20 08:31 AM heh 04-Apr-20 08:31 AM your telling me as I sit here and bash my head against VHDL 04-Apr-20 08:31 AM god hardware design languages just... ugh 04-Apr-20 08:31 AM yeah no I'm staying tf away from software 04-Apr-20 08:31 AM mind bending after years of just... normal scripting/coding 04-Apr-20 08:31 AM heh... "coding" yea I mean kinda... its describing hardware... kinda... 04-Apr-20 08:33 AM fpga stuff? 04-Apr-20 08:33 AM yea 04-Apr-20 08:33 AM but vhdl is also used to describe... silicon... 04-Apr-20 08:33 AM I mean like FPGAs just use less of the language basically 04-Apr-20 08:33 AM since certain logic states and things you don't have to worry about since well its physically impossible in how the FPGA is laid out 04-Apr-20 08:33 AM but in designing real hardware... well yea theres more than '1' '0' and Z 04-Apr-20 08:42 AM Describing Si as in... making a layout? 04-Apr-20 08:42 AM I think I'm looking at ICs too much like tiny PCBs 04-Apr-20 08:42 AM well so yes you CAN lay them out by hand... and really things like say... generics... adders... etc... are designed by hand 04-Apr-20 08:42 AM but no... so like 04-Apr-20 08:42 AM in the vhdl library ieee.std_logic_1164 it describes your standard logic... like lets say you want to and two bits together... 04-Apr-20 08:42 AM in a silicon compiler (called something I am drawing a blank on right now) it knows if you want an and gate to lay out a block with transistors all in the way you need 04-Apr-20 08:42 AM (you also generally describe VDD/VSS on the module with that logic within so it knows also to hook all that up too) but yea... 04-Apr-20 08:42 AM its basically an auto place and route... sometimes for more complex designs they will go in and do manual tape-up to like... get timing stuff better 04-Apr-20 08:42 AM but generally thats done by compiler tweaks now I think 04-Apr-20 08:42 AM RISCV for example... 04-Apr-20 08:42 AM dear god... 04-Apr-20 08:42 AM they generated that from a java based language... all the way to silicon... 04-Apr-20 08:42 AM on silicon it just looks like a massive blob... 04-Apr-20 08:42 AM but it is far from laying things out on silicon by hand anymore... 04-Apr-20 08:46 AM oh, that's pretty cool! 04-Apr-20 08:46 AM I always wondered how they do the really complex stuff like CPUs 04-Apr-20 08:48 AM https://abopen.com/app/uploads/2018/05/onchip-sifive-openv.jpg 04-Apr-20 08:48 AM so like you can see the sram blocks... for like caches... 04-Apr-20 08:48 AM but the rest is autoplaced bloby stuff 04-Apr-20 08:48 AM blueish white noise .jpg 04-Apr-20 08:48 AM yea... in most other processors historically its more... units... 04-Apr-20 08:48 AM like one team designs a unit then they all get placed and routed together 04-Apr-20 08:48 AM so its more... squares... 04-Apr-20 08:49 AM that's what I'm used to 04-Apr-20 08:49 AM https://live.staticflickr.com/4529/38525119911_7ea9430630_b.jpg 04-Apr-20 08:49 AM P3 die for example 04-Apr-20 08:49 AM and the "just throw it in there" solution is easier to make or does it offer other advantages? 04-Apr-20 08:50 AM well... the auto-place-route stuff means you just write code(tm) and out comes physical hardware... 04-Apr-20 08:50 AM obviously the other way you need people with lots of different disciplines involved 04-Apr-20 08:51 AM so it's easier 04-Apr-20 08:51 AM is there any difference in the final performance? 04-Apr-20 08:51 AM yes obviously, now which is better... depends(tm) 04-Apr-20 08:51 AM like... I mean theoretically the computer can route things better than humans... but obviously that is not true always... 04-Apr-20 08:55 AM first thing that comes to mind is physical time the signal needs from one blob to another 04-Apr-20 08:55 AM but I'm not sure if that even plays a role here 04-Apr-20 08:56 AM oh absolutely... timing analysis of EVERY signal is done 04-Apr-20 08:56 AM your slowest signal is your fastest possible clock more or less... 04-Apr-20 08:56 AM but yea... LOTS of time and effort goes into characterizing a chip... pre silicon... AND post silicon... 04-Apr-20 08:58 AM so it's all just black magic 04-Apr-20 08:58 AM as far as I know so far lol 04-Apr-20 08:58 AM its turtles all the way down... 04-Apr-20 10:42 AM what is SCPA? 04-Apr-20 10:42 AM nice cats @GigaSquirrel! 04-Apr-20 10:42 AM also nice casts 04-Apr-20 10:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200404_195808-06EBD.jpg 04-Apr-20 10:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200404_195815-2B18A.jpg 04-Apr-20 10:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200404_195821-B69ED.jpg 04-Apr-20 12:09 PM Fwiw, analog cells are still load out by hand for silicon design 04-Apr-20 12:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200404_203433-B133B.jpg 04-Apr-20 12:41 PM Do you have your own lathe in your home machine shop, @GigaSquirrel ? Or am I thinking of someone else? 04-Apr-20 12:41 PM That looks nice. 04-Apr-20 12:42 PM Yep, I do! 04-Apr-20 12:42 PM Especially since you’re just pouring it. We’ve been doing vacuum investment casting for jewelry stuff. 04-Apr-20 12:42 PM What kind? 04-Apr-20 12:42 PM We have a Clausing and a LeBlond at the makerspace. 04-Apr-20 12:42 PM Both manual. No CNC lathes. 04-Apr-20 12:42 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-23CAD.jpg 04-Apr-20 12:42 PM Was playing around today with an industrial CNC controller. Got a thermocouple for it. 04-Apr-20 12:42 PM My plan is to hook it up to a solid state relay to control heat tape for baking out stuff. 04-Apr-20 01:03 PM lol are you casting your own kf reducer ? that's cool 04-Apr-20 01:13 PM @GigaSquirrel in case the kf adapter fails, that mushroom looking piece should be useful as art at least :p 04-Apr-20 01:14 PM Looks terrible and doesn't work 04-Apr-20 01:14 PM => It's art! 04-Apr-20 01:32 PM Totally sell it at some music festival 04-Apr-20 01:40 PM @GigaSquirrel Al? 04-Apr-20 01:40 PM Yep, aluminium 04-Apr-20 01:53 PM sweet, did you just use random aluminum you had laying around or do you get some sort of specific stock to use? 04-Apr-20 02:11 PM Nah, just some round stock I had here 04-Apr-20 02:11 PM unoknown alloy from the scrapyard 04-Apr-20 02:15 PM cool 04-Apr-20 02:15 PM attempting to print a mold and cast a high temp gasket today for rotary pump, will see how that goes 05-Apr-20 07:32 PM @samy, 3D printed mold? 05-Apr-20 07:52 PM @piGuy yeah, nylon 06-Apr-20 08:04 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200406_170136-EF73B.jpg 06-Apr-20 08:04 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200406_170151-942B1.jpg 06-Apr-20 08:04 AM fresh off the lathe 06-Apr-20 08:04 AM with all the virtual leaks 06-Apr-20 08:04 AM but I have som suspicions what caused that, and I'm already working on a solution 06-Apr-20 08:07 AM so that's just cast but you surfaced the ends? 06-Apr-20 08:09 AM yep 06-Apr-20 08:09 AM I'm pretty sure the mold got too cold on this one, as well as too much gas dissolved in the Al 06-Apr-20 08:10 AM IF you were acually trying to make a bunch, I wonder if making a jig to clean it up would be faster/easier than perfecting your casting process 06-Apr-20 08:10 AM A bunch being... like 30? 06-Apr-20 08:10 AM What are the heating elements made from? 06-Apr-20 08:10 AM if I was trying to make a bunch I'd get a bigger oven that can fit more than two molds inside 06-Apr-20 08:10 AM No-name kanthal from banggood @Addison-110m 06-Apr-20 08:11 AM Cool 06-Apr-20 08:11 AM IDK if a bigger oven would be worth it for the 30 mark! 06-Apr-20 08:13 AM I should make some friends with a bigger oven 06-Apr-20 08:13 AM How long did the mold take to make? 06-Apr-20 08:14 AM ~1 Hr print, ~30 mins for casting, 5 hrs for crying and heating 06-Apr-20 08:14 AM lol 06-Apr-20 08:14 AM *drying 06-Apr-20 08:14 AM also some crying if it cracks 06-Apr-20 08:15 AM Cool! What I like about this DIY one is you can make custom length parts 06-Apr-20 08:16 AM weird-angle pieces 06-Apr-20 08:20 AM a slanted cone 06-Apr-20 08:20 AM I bought a 45 degree KF50 elbow thinking it would be useful while I was trying to jam pipes/hose into already existing infrastructure. It wasn't, but it was fun to keep trying it and have no success. 06-Apr-20 08:21 AM Now imagine if you needed a 43.2° Elbow 06-Apr-20 08:49 AM @GigaSquirrel what kind of lathe? 06-Apr-20 08:56 AM A terrible one 06-Apr-20 08:56 AM emco compact 5 06-Apr-20 08:57 AM oh that's cute 06-Apr-20 08:58 AM but terrible 06-Apr-20 08:58 AM nothing is hardened 06-Apr-20 08:58 AM I think at that size 06-Apr-20 08:58 AM that's not really the main problem 06-Apr-20 08:59 AM all the moving parts are on non hardened trapezoidal screw threads, held on by zinc nuts 06-Apr-20 10:47 AM Better than a lathe PS:One dumped many years ago. I think people said it was made out of compressed glitter. I remember people hitting the casting with a hammer and breaking off pieces in chunks. 06-Apr-20 10:48 AM I know someone who made a CNC mill made out of 8020 filled with chunks of granite (counter tops) and epoxy. That's kinda like glitter? 06-Apr-20 10:49 AM Sometimes equipment gets creatively dismantled. I remember a broken vacuum former. We took out our aggression on it with a plasma cutter. 08-Apr-20 10:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200408_190609-C5D69.jpg 08-Apr-20 10:14 AM I did a thing 08-Apr-20 10:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200408_191304-D6EBC.jpg 08-Apr-20 10:14 AM things might be getting out of hand 08-Apr-20 11:05 AM nice 08-Apr-20 02:14 PM One.. two... Three... Four... Five! Five radiation detectors! Ah ah ah aaah! 08-Apr-20 03:45 PM Any time I read “I did a thing” I hear it in Jeremy Clarkson’s voice 08-Apr-20 03:45 PM Nice collection of Ludlum units. All different or the same? What about detectors? 08-Apr-20 03:47 PM one model three, rest model 12 08-Apr-20 03:47 PM and detectors 08-Apr-20 03:47 PM well 08-Apr-20 03:47 PM waddaya want 08-Apr-20 03:47 PM 'cause I've got everything 08-Apr-20 03:48 PM I just have a single 3 with a 44-9 I primarily use to check to see if tungsten is thoriated. 08-Apr-20 03:48 PM that thing on the second shelf has the same tube as the 44-9, but is tungsten shielded, making it highly directional 08-Apr-20 03:48 PM and heavy 08-Apr-20 03:49 PM Cool. 08-Apr-20 03:49 PM eberline... HP-210T iirc? 08-Apr-20 03:50 PM Sounds about right 08-Apr-20 03:50 PM Ive used a few of them 08-Apr-20 03:50 PM I really like them 08-Apr-20 03:50 PM Yea... time to go home. I am feeling less critical need every day! Hahahaha 08-Apr-20 03:50 PM was my general purpose one until I got that contamat 08-Apr-20 03:51 PM The what? 08-Apr-20 03:51 PM the non-ludlum on that shelf 08-Apr-20 03:51 PM Ah 08-Apr-20 03:51 PM big proportional detector that uses lighter gas 08-Apr-20 03:51 PM and is selectable alpha or beta/gamma 08-Apr-20 03:53 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-D9E69.jpg 08-Apr-20 03:53 PM Something like this sort’ve ? 08-Apr-20 03:59 PM ohh that looks fun 08-Apr-20 03:59 PM no, mine has the same refill port as a lighter 08-Apr-20 03:59 PM That sounds way more convenient 08-Apr-20 04:00 PM it's really convenient 08-Apr-20 04:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200409_005942-A442B.jpg 08-Apr-20 04:00 PM ignore the yellow tape, I may or may not have had a misshap with the foil 08-Apr-20 04:01 PM That’s be so much easier. The one I showed you is currently on a shelf in a basement because that’s not a standard screw thread I think. 08-Apr-20 04:02 PM the thread on the bottle or what? 08-Apr-20 04:02 PM Right 08-Apr-20 04:02 PM That and it’s not really worth the time to get it working 08-Apr-20 04:02 PM Which I really resent 08-Apr-20 04:03 PM but throwing a new bottle holder in there should be doable 08-Apr-20 04:03 PM take apart a benzomatic or similar 08-Apr-20 04:04 PM Yeah, probably would work 08-Apr-20 04:07 PM might be a nice project in the mean time while you're not operating a freaking nuclear reactor 08-Apr-20 04:07 PM Well I won’t be doing that for a while 08-Apr-20 04:08 PM ah, right 08-Apr-20 04:08 PM the whole pandemic thing and whatnot 08-Apr-20 04:09 PM And some other stuff. But it’s there and I’m very much not. 08-Apr-20 04:09 PM Unfortunately 08-Apr-20 04:10 PM naw, too bad 08-Apr-20 04:12 PM Next year is going to be fun from a standpoint of getting everyone back up and going again 08-Apr-20 04:13 PM or at least trying to 08-Apr-20 04:13 PM Hm? 08-Apr-20 04:14 PM I don't think everything will (be able to) return back to normal 08-Apr-20 04:14 PM (if you're talking about restarting everything after covid, if not I must have missed something) 08-Apr-20 04:14 PM trump got asked an hour ago if he would pardon tiger king 08-Apr-20 04:14 PM in case you were at all wondering how the whole pandemic response thing is going 08-Apr-20 04:15 PM I’d agree with that, but whatever approximation of normal is possible then 08-Apr-20 04:16 PM fair 08-Apr-20 04:16 PM just think of all the Ge(Li)s that will die now 08-Apr-20 04:24 PM Are there any left? 08-Apr-20 04:26 PM sure are 08-Apr-20 04:27 PM I guess I can believe it, as surprising as it feels 08-Apr-20 04:27 PM New hardware is really expensive 08-Apr-20 04:27 PM some of them were as good as a good hpge, and most facilities try to never Change a running system 08-Apr-20 04:27 PM sure, they're definitely a rarity nowadays 08-Apr-20 04:30 PM I feel like it’s a fairly reasonable case to make to let someone go in once every week or so in order to keep a very expensive to replace piece of equipment from being ruined 08-Apr-20 04:32 PM let's hope so 08-Apr-20 04:33 PM Those, maybe NMR magnets 08-Apr-20 04:34 PM oh, right 08-Apr-20 04:43 PM Yeah, but I’d imagine the nitrogen and helium suppliers are still going though 08-Apr-20 10:54 PM Collected pollen dust off of my grill before I fired it up for dinner. 08-Apr-20 10:54 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200409.000061-677BA.jpg 08-Apr-20 10:54 PM I don't have a lyophilizer, so they collapsed and got all wrinkly in the SEM. 08-Apr-20 10:54 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200409.000055-B2329.jpg 08-Apr-20 10:54 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200409.000062-C3DEE.jpg 09-Apr-20 12:57 AM @piGuy hmm, I have a TON of fir tree pollen on my truck... I should try doing the same 09-Apr-20 12:57 AM Did you just use some double sided carbon tape? 09-Apr-20 12:57 AM Your background looks a bit smoother than my carbon tape appears 09-Apr-20 02:02 AM spicy peppercorns 09-Apr-20 02:02 AM very nice pics! 09-Apr-20 02:02 AM Now make them go away 09-Apr-20 07:11 AM @nmz787 Yes I just put carbon tape on a stub and used a q-tip to pick up the pollen and apply it to the tape. 09-Apr-20 04:49 PM I think I'm getting close to the stated resolution of my SEM (25nm). This is an image of commercial silver nanoparticles. 09-Apr-20 04:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200409.000072-2B344.jpg 09-Apr-20 05:59 PM how high can your accel voltage go, 30 kV? 09-Apr-20 09:51 PM 15kV is the max 12-Apr-20 11:39 PM Some improvement in iridescent chocolate 12-Apr-20 11:39 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/irichoc200412-8154F.gif 12-Apr-20 11:53 PM Is that from a reusable mold?? 13-Apr-20 01:10 AM Nice! 13-Apr-20 01:10 AM Do tell more! 13-Apr-20 01:11 AM no mold yet 13-Apr-20 01:11 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_9220-F7238.JPG 13-Apr-20 01:11 AM that's from melting chocolate chips, trying to get them reasonably soft/liquidy without burning them, put them into a glass vial thing (not sure what it's called) and just laser cut some acrylic as a stamp, superglued diffraction grating to the bottom of the acrylic and pressed it against the chocolate with good pressure, left it in fridge 13-Apr-20 01:11 AM i've been trying various things and that's worked best so far, but goal is really to have some custom shapes and i'm not sure how often i can reuse the grating. i clean it with a little 99% isopropyl after each time. really want to mold the grating into something else that i can reuse more easily 13-Apr-20 09:54 AM You could maybe use stainless with carefully-manipulated machining marks to make a grating-like effect? 13-Apr-20 09:54 AM That would be much more reusable than a presumably aluminum-coated grating? 13-Apr-20 10:06 AM carbide drag engraver maybe? 13-Apr-20 10:06 AM or a fly cutter...have gotten diffraction grating like finishes using those 13-Apr-20 12:24 PM really? interesting...it's capable of creating grates with super tiny widths? 13-Apr-20 12:30 PM Well your "goal" is to make a surface that gives little rainbows when it's hit by normal incoherent white light, right? 13-Apr-20 12:30 PM To do that you don't need a full-on diffraction grating 13-Apr-20 12:30 PM just a few mm^2 of ~um-scale parallel lines will have that effect 13-Apr-20 12:30 PM the larger the area & the more uniformly-spaced / parallel the lines are, the stronger the interference effect will be and the rainbows will be better 13-Apr-20 12:30 PM tighter line spacing will give better contrast as you'll have less reflections and more interference per unit area 13-Apr-20 12:56 PM @samy how "super tiny" are we talking? i grabbed a couple scraps and threw them under the scope to take some quick photos for you 13-Apr-20 12:56 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200413_125152-331B4.jpg 13-Apr-20 12:56 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200413_125230-D4021.jpg 13-Apr-20 12:56 PM was not trying for anything in particular with those when i cut them as they are just scrap pieces with fly cut surfaces but that might give you an idea of what you can do 13-Apr-20 12:56 PM tossed a mm ruler in there for a sense of scale 13-Apr-20 12:56 PM that is a single point HSS tool in a fly cutter on aluminum 13-Apr-20 12:59 PM ahh nice! 13-Apr-20 01:00 PM light conditions are not great today or i would snap a quick video of the surfaces...in a decent bit of sun you get a nice rainbow effect on them 13-Apr-20 01:16 PM Hard to tell but is that ~100 lines/mm? in the second image 13-Apr-20 01:18 PM not sure what the feed rate was on that and i did not try to count the number of lines 13-Apr-20 01:18 PM it has been in my scrap bin for awhile...some of the ridges in areas were totally squashed 13-Apr-20 06:20 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200413_181113-F0BFB.jpg 13-Apr-20 06:20 PM 99mTorr!!! 13-Apr-20 06:20 PM (well ok, 98) 14-Apr-20 07:21 AM I’ve been bored, so that means reorganizing the kitchen. 14-Apr-20 07:21 AM And I finally got around to doing an autopsy on my (cheap) espresso machine. 14-Apr-20 07:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-94A0C.jpg 14-Apr-20 07:21 AM I was expecting the heater or thermal switch would be dead. 14-Apr-20 07:21 AM And was pleasantly surprised that instead, the problem was the front panel rocker switch. 14-Apr-20 07:21 AM I’ve found an exact replacement. In the mean time, I gave it a good cleaning and am reassembling it. I guess one can use it for now by starting it like a car... by twisting the wires together. 14-Apr-20 09:33 AM Now I’m in the realm of chemistry. There’s a massive amount of scale in it. 14-Apr-20 09:33 AM We don’t have any white vinegar, but I looked through my photo chemicals and found a gallon of glacial acetic acid and am diluting it and running it through.... 14-Apr-20 09:33 AM The kitchen reeks of vinegar. I’m leaving some in it to soak for a while now and will run it again. 14-Apr-20 09:41 AM citric acid works too 14-Apr-20 10:10 AM Switches are typically what die in coffee related equipment. My friend was a coffee house manager and asked me to come look at his equipment. All had bad rocker switches. Made adaptors and changed them all for Japanese industrial grade rocker switches. Also on the grinders put On Off (On) momentary switches and they were so much happier. 14-Apr-20 10:10 AM I’m sorry. Edit. I changed to toggle switches 14-Apr-20 01:02 PM I was surprised. I figured I’d find the thermostat or heater had an open circuit. Instead, those were fine. It was the stupid switch. 14-Apr-20 01:02 PM This is a lousy machine. I know someone with a real espresso machine who retrofitted a PID to it. 16-Apr-20 11:36 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-9FE50.jpg 16-Apr-20 11:36 AM I have a set of 8 of these. Really small shot glasses. 16-Apr-20 11:36 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-3F1A9.jpg 16-Apr-20 11:36 AM And a set of 6 of these. Looks almost like a kid’s tea set. Sure, let the kids play with uranium.... 16-Apr-20 11:39 AM I LOVE THOSE SHOT GLASSES 16-Apr-20 11:39 AM so smol 16-Apr-20 03:35 PM Thanks! They're putting the micro in microsievert! 16-Apr-20 04:54 PM no stamp/pressure this time but instead cooled inside vacuum chamber 16-Apr-20 04:54 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/irichoc200413-62073.gif 16-Apr-20 05:26 PM @samy wait you didn't stamp the chocolate? 16-Apr-20 05:26 PM not this time 16-Apr-20 05:26 PM How is it diffractive? 16-Apr-20 05:27 PM it sat on the diffraction grating 16-Apr-20 05:27 PM Oh, well that's a stamp of sorts 16-Apr-20 05:27 PM Sounds similar to how my buddy has taken replicas of nanostamps 16-Apr-20 05:27 PM Dropping plastic pellets on a hot wafer and letting cool, then peeling off 16-Apr-20 05:34 PM my first attempt was done similarly, but i got very little diffraction from it - this time i used vacuum + made it thicker by surrounding it. Stamp (essentially injection molding) worked but was difficult to remove and broke apart 16-Apr-20 05:36 PM Ahh 16-Apr-20 05:36 PM Diy electroforming can be pretty successful 16-Apr-20 05:36 PM I recommend using nickel sulfamate recipe 16-Apr-20 05:36 PM Least stresses internally 16-Apr-20 05:41 PM what part would be electroformed? 16-Apr-20 05:41 PM are you saying to create a metal mold via electroforming? 16-Apr-20 05:44 PM Yea 16-Apr-20 05:44 PM Sputter or evap some metal onto your grating, as a seed layer 16-Apr-20 05:44 PM Then electroform a thick layer onto that 16-Apr-20 05:44 PM Electroless deposition might also work for the seed layer 16-Apr-20 05:47 PM ahh interesting 16-Apr-20 05:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/MVIMG_20191216_232736-AF5B4.jpg 16-Apr-20 05:49 PM That's how that was made 16-Apr-20 05:52 PM what is that? 16-Apr-20 06:06 PM Nickel electroform of some text with ~130nm linewidths on the characters 16-Apr-20 06:23 PM wow 16-Apr-20 06:26 PM Better shot 16-Apr-20 06:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191103_210523-52507.jpg 16-Apr-20 06:26 PM Stamped out with UV cured resin, then re-electroformed 16-Apr-20 06:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191030_010405-581B7.jpg 17-Apr-20 11:40 AM ooh nice 20-Apr-20 09:13 AM Finally got the first set of custom machined porous glass emitters for the AIS-ILIS1 ionic liquid electrospray thruster. Very happy with how they came out, one step closer to some very advanced micro ion thrusters! 20-Apr-20 09:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200420_120705-09D20.jpg 20-Apr-20 09:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200420_120708-F6F98.jpg 20-Apr-20 09:45 AM Neat! 20-Apr-20 10:02 AM With these in, I can get the rest of the thruster manufactured now. Just gotta get the housing 3d printed, extractors laser cut, fuel it in vacuum, and slap it together. I'm still really struggling with the electronics, but it's getting a lot closer to realization now. 20-Apr-20 10:04 AM Oooooooooo... Hahahah. Fun. 20-Apr-20 12:32 PM Do you have a good idea on how you will fill them? I have heard it's a nightmare 20-Apr-20 01:37 PM I've heard it's pretty easy lol. There are better ways than others. Obviously the best way is degassing the fuel in high vacuum then wetting the emitter and reservoir, but I've also heard you can just drop the fuel over the porous surface with a syringe in a pinch too 20-Apr-20 01:37 PM I plan on making a vacuum fueling station where I have a set amount in some tray, degas it at high vacuum, then have a servo actuator drop the emitter and reservoir into the degassed pool 20-Apr-20 01:37 PM Ideally you don't want any air or water vapor so you don't burp up fuel and cause arcing when turning on the voltage. Also there is an optimum amount for the reservoir. Too filled and it can cause bridging, but that may not be an issue in my setup since spacing is larger than conventional micromachined structures 20-Apr-20 01:37 PM But there will be a lot of trial and error lol 20-Apr-20 01:42 PM I remember the guys from Busek talking about it and it seemed so completely mind boggling 20-Apr-20 01:42 PM and finicky 20-Apr-20 01:43 PM Busek never did ILIS, at least as far as I am aware they only did colloidal, where they used active pressurized feeding 20-Apr-20 01:43 PM It's possible they have dabbled with it though 20-Apr-20 01:44 PM Yeah you are right. 20-Apr-20 01:46 PM The killer for ILIS right now is lifetime, and I don't think anyone has run macro-scale ILIS longer than a few hours. Accion has a lifetime of like 800 hours now, but still working out extending the life. Extended reservoir capacity for this type hasn't been explored yet either, and at least Accion has never published anything on how they are feeding their really big arrays 20-Apr-20 01:46 PM Of course I still need to get the stupid electronics working lol 20-Apr-20 01:47 PM Story of my life in our current development... 20-Apr-20 01:48 PM Lol honestly I am finding electronics the most costly and complex part of thruster design and testing 20-Apr-20 01:50 PM For DIY/one man show I am not surprised. For professional I think the tradeoff with assembly/inspection/testing is different. 20-Apr-20 01:54 PM Yeah, especially if you are pumping out a lot of thrusters. Doesn't Enpulsion have some of the highest EP production? Or at least it seems like Enpulsion has the most EP thrusters built, shipped, and tested lol 20-Apr-20 01:55 PM We do produce a lot. Probably only second to SpaceX. 20-Apr-20 01:55 PM Do you have trouble as an individual about getting the components you wantÉ 20-Apr-20 01:55 PM ? 20-Apr-20 01:55 PM Find that a lot of the big EEE people don't want to sell to smaller organizations. 20-Apr-20 02:01 PM Yeah, that's really impressive, you guys got my respect lol. Enpulsion is probably my favorite out there for micropropulsion. I honestly haven't had many issues getting components. Really the biggest limit is cost and what I can do on my budget, but I design around what can be manufactured and obtained at a reasonable cost for me. Obviously for example like my iodine thrusters using some fancy custom molybdenum storage tank would be ideal, but I'm going with 3d printed high temp plastics instead lol. Other challenges include designing around as little custom machining as possible in general. The one component I am having trouble finding though are suitable pulse caps for my PPTs. Other than that though I can find what I need for electronics. 20-Apr-20 02:01 PM Well, actually the big roadblock right now is finding switching for the ILIS1. There isn't much available for the voltage level, power, and size I need 20-Apr-20 02:05 PM Switching HV is a major challenge. 20-Apr-20 02:05 PM That and connectors 20-Apr-20 02:05 PM But I guess you go for all soldered so that doesn't apply too much for you. 20-Apr-20 02:07 PM Yeah, I try to design small enough with everything integrated that it all connects together or is soldered at the board. Switching HV is easy when you don't need to worry about size lol, I'm used to switching tens to hundreds of kv very fast for large pulsed power systems, but even a few kv at micropropulsion scale is really demanding 20-Apr-20 02:07 PM I can imagine FEEP in particular is pretty difficult considering you run some of the highest voltages for EP lol 20-Apr-20 02:10 PM Yeah I used to do Hall thrusters and now I can't believe what you can get away with when you stay below 1kV. 20-Apr-20 02:12 PM Yeah, Hall is surprisingly low voltage compared to lots of other stuff. I think Hall and FEEP are probably the most challenging at my level, I won't be touching those for a while. Got my hands full enough already, but I've put those two off for good reasons lol. 20-Apr-20 02:13 PM I think you could do Hall easy if you had the pumping speed. Manufacturing is really easy, the only hard part is the hollow cathode. And even then you can start with oversize thermionic emitters 20-Apr-20 02:15 PM Yeah hall won't be terribly difficult, but I think RF plasma and gridded ion are easier enough to tackle first, and I think I can do them cheaper. I definitely plan on starting with thermionic emitters at least. FEEP though is a major pain lol 20-Apr-20 02:18 PM Do you have the RF source already or do you plan to design one? 20-Apr-20 02:18 PM A very small self heated hollow cathode is something I could see a few people be really interested in. I tried it a bit at the end of the PhD but it is a real challenge in design and manufacturing. 20-Apr-20 02:21 PM I'm going to have to design one lol, but there are plenty of plans and circuits for stuff like 13.56MHz class e amplifiers that don't look too bad to do. Heated hollow cathodes require a low work function coating though right? Like LaB6? That's the killer for me lol. I am familiar with hollow cathodes ebeam sources for high power pulsed ebeam generation, where they are run literally cold with just a bare hollow metal cathode, but that requires pulsed power systems beyond what is probably reasonable for a nanosat. You also don't need 100s of amps to kA level ebeams for neutralizers either lol, which these types generate 20-Apr-20 02:25 PM I found out you can get surprisingly cheap LaB6 from china. 20-Apr-20 02:25 PM I forgot you work on accelerators. Those numbers always blow my mind 20-Apr-20 02:26 PM Still have to deal with atmospheric poisoning with LaB6, my setup isn't good enough for that lol 20-Apr-20 02:26 PM There is stuff like RF hollow cathodes though right? Could always try possibly playing with that 20-Apr-20 02:27 PM Nah LaB6 is pretty bulletproof when cold 20-Apr-20 02:28 PM Maybe that's just for LaB6 accelerator dispenser cathodes then, we can't have them exposed to atmosphere for more than a few minutes otherwise they will start to be poisoned 20-Apr-20 02:28 PM it's not like BaO that needs 99.999% pure Xenon and all the other crazyness 20-Apr-20 02:28 PM I have never been a fan of RF cathodes. They often suck more power than the thruster itself. 20-Apr-20 02:29 PM How does LaB6 hold up to iodine though? 20-Apr-20 02:29 PM That's the million dollars question 20-Apr-20 02:29 PM I don't know if anyone has published anything about it 20-Apr-20 02:29 PM but I would bet not at all 20-Apr-20 02:30 PM Wait really? Actually, that makes sense, everyone can just afford to run xenon through their cathodes lol even with iodine main propellant 20-Apr-20 02:30 PM I can't imagine it would do to well with iodine though anyway 20-Apr-20 02:31 PM Yeah but it kind of kills the point of an iodine thruster if you need two tanks and propellant managmement systems 20-Apr-20 02:31 PM Yeah lol 20-Apr-20 02:32 PM Nobody has shown good iodine hollow cathodes as far as I know. Alledgedly Busek has a solution for the demo mission they are supposed to fly but it has been pushed down so much that I don't know what to believe 20-Apr-20 02:34 PM Supposedly ThrustMe system is done without a neutralizer with additional pulsed grids that allows ions to always pass and gate electron emission from the discharge chamber. Have you heard anything or talked to them before? I've seen Buseks proposal, thought that was flying soon. How far back has it been pushed? Any reason? I'm surprised there are so few iodine thruster tests. At least for me, its the only viable way to make a conventional higher power gas fueled ion or plasma thruster lol. Even water requires pressurization to an extent and some custom tank solutions that would be more costly than practical for me. 20-Apr-20 02:34 PM Then there is t4i making RF Helicon iodine as well, but RF plasma have much less issues since you can run any gas through them and they will work lol 20-Apr-20 02:37 PM Yeah the thrustMe stuff is a cool idea. Same RF supply for ionization and grids. The numbers they showed last were not great in terms of performance tho. I know them a little bit. The engineering team is friendly but their CEO (used to be a PI in a big lab) is a bit on her high horses all the time. 20-Apr-20 02:37 PM Buseks stuff has been supposed to fly soon for years now. My feeling is that they don't have a cathode or they haven't solved all material compatiblity issues. 20-Apr-20 02:37 PM Also health and safety on iodine is a bit iffy in a professional setting 20-Apr-20 02:39 PM I'd play with the ThrustMe idea myself but they would probably sue me lol due to it being patented 20-Apr-20 02:39 PM Maybe, especially now that you are incorporated 20-Apr-20 02:39 PM let's say that wouldn't be out of character :p 20-Apr-20 02:39 PM Yeah, I also worry about iodine. I will only be testing tiny amounts for very short runs, open doors and fans blowing air through, probably need exhaust traps but still 20-Apr-20 02:40 PM the rest of the community is a lot more chill than them 20-Apr-20 02:40 PM Oh fun, ThrustMe is one of those places lol 20-Apr-20 02:40 PM Probably shouldn't tag them and poke them then if I get an iodine thruster working lol 20-Apr-20 02:40 PM Then again, it's still tempting... 20-Apr-20 02:41 PM They are not all like that. There is a guy who is finishing his PhD in partnership with them on Iodine modelling 20-Apr-20 02:41 PM https://twitter.com/plasmarmuse 20-Apr-20 02:41 PM He is fun 20-Apr-20 02:42 PM Oh wow, already following him lol 20-Apr-20 02:43 PM Alright need to go to bed, it's getting late here. 20-Apr-20 02:43 PM See you around 20-Apr-20 02:44 PM Alright ttyl! 20-Apr-20 03:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200421_002227-C8AAC.jpg 20-Apr-20 03:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200421_002759-A1BBF.jpg 20-Apr-20 03:35 PM had a bit of deposition on my viewport 20-Apr-20 03:35 PM but, since it's all (mostly) copper some ferric chloride did the job 20-Apr-20 03:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200421_002931-3EDE1.jpg 20-Apr-20 03:35 PM got rid of everything but a ~1 cm² rainbow right in the middle where that spot is 20-Apr-20 03:35 PM I suppose that's permanent damage, but it's really just barely visible 21-Apr-20 10:47 AM https://www.youtube.com/watch?v=gxKf4i23HA4 I'm having way too much fun with my "ion source" 21-Apr-20 11:48 AM lol that's exactly what my mass spec looks like when the voltages are slightly wrong 21-Apr-20 04:33 PM what kind of mass spec @idmb 21-Apr-20 05:21 PM time of flight velocity map imaging 26-Apr-20 08:54 PM Application for the Dead Gauges Society 26-Apr-20 08:54 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200426_222039-562A1.jpg 26-Apr-20 08:54 PM Detail 26-Apr-20 08:54 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200426_223753-3E178.jpg 26-Apr-20 09:10 PM is that one of those hornets? 26-Apr-20 09:10 PM oh yeah it says so 26-Apr-20 09:10 PM 100% of the ones I have encountered have been iffy 26-Apr-20 10:03 PM All of them seem to cook the caps in them. Thus the name of Dead Gauges Society" 26-Apr-20 10:10 PM oh 27-Apr-20 10:52 AM @niflheim nice build! what is your full setup there? 27-Apr-20 10:52 AM think i'm done with this project for now - iridescent tempered chocolate 27-Apr-20 10:52 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/irichoc-tempered-502B2.gif 27-Apr-20 11:32 AM Varian SD-200 backing pump with forced air cooling, self-assembled 13X zeolite foreline trap with 220C PTC elements, Edwards EXT-255H turbopump with EXDC160 controller and self-assembled display (obscured by baffle, glows blue), cheap Supco gauge to tell me when to turn on the turbopump, Hornet IGM-400 ionization gauge, pneumatic valve for isolating the turbopump while cleaving off vacuum or gas-filled tubes. 27-Apr-20 11:32 AM Hmm I should probably move the Supco gauge to the exhaust side of the turbopump now that I have a proper one. 27-Apr-20 11:32 AM Ultimate vacuum attained overnight was about 5e-6 torr, which on further research may not be grease-limited. Will have to see what it looks like when parts for redoing the upper section arrive. 27-Apr-20 01:21 PM At -6 scale now your gas loads are probably pretty big unless you bake. Any aluminum or brass or unpasivated stainless can hold lots and lots of water vapor. Baking is now essential on things that can be baked. 27-Apr-20 01:28 PM I totally disagree, poor kf connections are likely to blame 27-Apr-20 01:28 PM that sort of pressure with that pump on that volume is gonna be a leak 27-Apr-20 01:52 PM I suspect the KF connections. A few of the KF-16 ones lack centering rings (waiting for China). Good enough to pump down vapor lamps. Not good enough for HV. There could also still be small amounts of iodine vapor deposited onto the walls. 27-Apr-20 01:52 PM Could perhaps think about better cold traps for that, nearer to the tube. 27-Apr-20 01:52 PM After finishing these lamps, baking will also be needed to remove the aforementioned vapors. 27-Apr-20 01:52 PM Could also be the Supco gauge. Some reviewers complained of leaks. Clearly nothing large enough to prevent reaching adequate foreline vacuum, but perhaps a different matter on the chamber side? 27-Apr-20 02:05 PM A few of the KF-16 ones lack centering rings You just... jammed an oring in there and squeezed? O.o 27-Apr-20 02:05 PM Not quite 27-Apr-20 02:07 PM What's going on here? 27-Apr-20 02:07 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-EB638.png 27-Apr-20 02:07 PM There is still a sort of washer to prevent it from collapsing into the channel and leaking. And some wire to prevent flattening. But rather hacky. Not a proper one. 27-Apr-20 02:07 PM That's the Supco gauge lol 27-Apr-20 02:07 PM I think it should be moved to the foreline now. 27-Apr-20 02:07 PM The connector, is that threaded with teflon or what? 27-Apr-20 02:07 PM Dow Corning high vac grease. 27-Apr-20 02:07 PM I'm more thinking of leaks within the gauge itself at internal sealing faces. 27-Apr-20 02:26 PM Ordered a few parts to move the Supco gauge to the foreline side. 28-Apr-20 07:48 AM Ohhhh.... Did not know about KF fittings being used. Yeah.... that’s the lowest you are gonna get. Also Dow Corning vacuum grease is gonna limit you as well. 28-Apr-20 08:26 AM I've gone down to e-8 with kf and dc high vac grease 28-Apr-20 08:26 AM it's just important to do proper leak testing, as KF can sit slightly bad and cause a minute leak 28-Apr-20 08:26 AM also wiping flanges and o-rings with IPA before installing does wonders 28-Apr-20 08:52 AM Yeah, if it has pumped for a week that's a real leak. Not virtual, and not offgassing. Or your turbo is the worst turbo ever 28-Apr-20 09:02 AM yeah, sure, long pumping and baking is required for everything below e-6 ^^ 28-Apr-20 10:02 AM 1E-7 is pretty easily hit with tons of water on the walls 28-Apr-20 10:02 AM Like if you just bolted a 6" CF turbo to a 6" CF cross with all the sides but one having just been soaked in water for a week, and a cold cathode gauge on top... You'd hit -7 in a day or two. 28-Apr-20 04:05 PM Based on this discussion, I'm pretty sure it's the o-rings, and possibly also the roughing gauge (which is being moved). The valve is rated to at least 1e-8 and is running toward the higher end of its pneumatic actuation pressure so it isn't likely to be a problem. I could switch to Apiezon probably. I can't really switch from KF, though. The turbo itself is KF. I did see some Helicoflex metal o-rings that may fit some of the joints. I did not see any aluminum or other knife-edge KF retrofitting gaskets (supposedly exist but seemingly rare). 28-Apr-20 04:05 PM I could also probably switch to liquid metal based sealant, but the elastomers will still be limiting without metal sealing rings. 28-Apr-20 04:05 PM I have a lot of galinstan and only used about half the ingredients I have to make it, so blending these alloys isn't an issue. A little goes a long way. 28-Apr-20 04:05 PM Turbo is rated to 1e-10 or so 28-Apr-20 04:05 PM Runs to full rated velocity according to the output from the controller, though the last 10-20% can take hours to attain 28-Apr-20 04:05 PM Popular model here actually 28-Apr-20 04:05 PM Thanks for the tip on the o-ring seating and grease also. I don't think I was very careful about that initially. System will probably be due for cleaning and reassembly after I am done messing with iodine vapor. No point baking before finishing that project. 28-Apr-20 04:05 PM Supposedly the 185nm mercury vapor lamp line is pretty good at knocking water off the walls 28-Apr-20 04:05 PM I don't have one installed though. Hard to hit all surfaces also. 28-Apr-20 04:05 PM I wonder whether copper gaskets and galinstan could work with KF flanges and normal KF centering rings. 28-Apr-20 04:05 PM No knife edge, would rely on the liquid metal within the planar capillary space between the gasket and the flange to seal. Also would want to use antimony-free galinstan, or perhaps even just indium-tin under pressure. 28-Apr-20 04:05 PM Problem is some degree of reactivity compared to grease 28-Apr-20 04:05 PM Apiezon probably more sensible 28-Apr-20 04:05 PM Permeability varies, currently using Viton almost everywhere. Neoprene in a few temporary joints while waiting for Chinese parts though.... 28-Apr-20 04:05 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/1588115837949-2E50D.png 28-Apr-20 04:19 PM on the wondering about KF abuse...would a fairly thick indium washer work? probably would be able to crush it down to seal with the KF clamps... 28-Apr-20 04:19 PM there are metal seals for kf 28-Apr-20 04:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/ab2c8b7d06a3b1c708bf4012ebfef85e81cf372b-73AC2.png 28-Apr-20 04:19 PM Yes, I mentioned that but have had a hard time finding them. 28-Apr-20 04:19 PM Yes exactly that kind! 28-Apr-20 04:20 PM https://www.novotek.de/Kleinflanschbauteile-KF/Dichtungsbauteile/Metalldichtring-Aluminium/ They sell them for acceptable prices, maybe you can order from them 28-Apr-20 04:20 PM Hence this led me to wonder about just stacking 1-2 similar-sized OFC CF gaskets and filling the seam against the flange with indium or galinstan 28-Apr-20 04:20 PM http://www.vacom-shop.de/epages/VacomShop.sf/de_DE/?ObjectPath=/Shops/Store.VacomShop/Categories/0000000001/0000000009/0000000086/0000000093 Same here, but way more expensive 28-Apr-20 04:21 PM Ah interesting checking 28-Apr-20 04:21 PM Huh these are much cheaper than I expected 28-Apr-20 04:21 PM Yeah at that point it wouldn't even matter if they were single use 28-Apr-20 04:21 PM Can these be used without grease if the mounting force is high enough? Obviously galinstan will destroy aluminum, though indium-tin shouldn't. 28-Apr-20 04:23 PM they're made to be used without grase, that's kinda the whole point of them, to get a metal to metal seal ^^ 28-Apr-20 04:23 PM Excellent-- checking assumptions 28-Apr-20 04:23 PM just keep in mind that you also need special clamps and that they don't work on Al parts, only stainless 28-Apr-20 04:23 PM My stuff is all stainless, though high pressure clamps will likely be needed 28-Apr-20 04:23 PM Ran into something similar making a hydrothermal reactor out of a tri-clamp spool and Tuf-Steel gaskets a while ago. Needed high pressure clamps. 28-Apr-20 04:24 PM The only reason I can imagine wanting to use metal seals for KF would be for high temperatures... 28-Apr-20 04:25 PM Avoiding grease vapors. 28-Apr-20 04:25 PM why grease? 28-Apr-20 04:25 PM you never grease KF 28-Apr-20 04:25 PM ... what 28-Apr-20 04:25 PM wait 28-Apr-20 04:25 PM you thought you had to grease the KF o-rings? 28-Apr-20 04:25 PM You do if you're using an ancient o-ring 28-Apr-20 04:25 PM Erm yeah 28-Apr-20 04:25 PM Well then 28-Apr-20 04:26 PM it's super common to see people do it but please don't 28-Apr-20 04:26 PM I thought you wanted to go like ultra high vacuum on an existing system 28-Apr-20 04:26 PM but no 28-Apr-20 04:26 PM ... then what is high vac grease even for...? 28-Apr-20 04:26 PM valves, things that move 28-Apr-20 04:26 PM making stains 28-Apr-20 04:26 PM just... greasing stuff 28-Apr-20 04:26 PM x___x 28-Apr-20 04:26 PM optical grease, in a pinch 28-Apr-20 04:26 PM Glad this subject came up ^^ 28-Apr-20 04:26 PM it can be useful on big bell jar seals 28-Apr-20 04:26 PM lolll 28-Apr-20 04:27 PM not just in a pinch, it works actually pretty well as optical grase 28-Apr-20 04:27 PM Interesting-- I heard of using it for improvising PMT coupling 28-Apr-20 04:27 PM https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=12861 28-Apr-20 04:27 PM I serves as hazing for interns when you ask them to remove 10 years old grease 28-Apr-20 04:27 PM For best performance, a very thin coating of vacuum grease should be applied to any O-ring used in a KF system. 28-Apr-20 04:27 PM Yes actually my giant 160L chamber uses it for the bell jar seal, but that's barely high vacuum 28-Apr-20 04:27 PM That's what I had read -____- 28-Apr-20 04:28 PM what 28-Apr-20 04:28 PM That's why I did it 28-Apr-20 04:28 PM You don't have to but you also don't have to not. 28-Apr-20 04:28 PM that's the first time I've heard of that 28-Apr-20 04:28 PM I've always used kf without grease and got down to specs 28-Apr-20 04:28 PM i think thorlabs is the only place i've heard that 28-Apr-20 04:29 PM Given you hit 1e-8, I hit 1e-6, and the grease vapor pressure is something*1e-7, I'm going to assume your method is better 28-Apr-20 04:29 PM I have never used any and gotten to 1e-7 mbar 28-Apr-20 04:29 PM a good wipe down of all sealing surfaces and replacing old hard o-rings 28-Apr-20 04:30 PM I use grease when my O rings aren't looking like new. (I throw them away if they're cracking ) 28-Apr-20 04:31 PM a good wipe down of all sealing surfaces and replacing old hard o-rings ^ This 28-Apr-20 04:31 PM Yeah new green Viton o-rings are usually $1/each or less from China in these sizes, so replacement of old ones isn't a problem if it's the limiting factor 28-Apr-20 04:31 PM Is that the best kind from a permeability standpoint? 28-Apr-20 04:32 PM I have all mixed o-rings, most unknown materials because I got them used 28-Apr-20 04:32 PM just clean everything with IPA 28-Apr-20 04:32 PM Given a turbo rated to 1e-10, metal to metal seals may still be better, but from this discussion the grease and temporary seals with questionable o rings likely matter most 28-Apr-20 04:32 PM Ah ok cool 28-Apr-20 04:33 PM yeah e-8 is like the absolute bottom for kf with regular o-rings 28-Apr-20 04:33 PM also, go for CF at those pressures 28-Apr-20 04:33 PM metal kf seals exist, but they're uncommon, cf is made for those low pressures 28-Apr-20 04:36 PM replacement of old ones is limiting when you want it right now 28-Apr-20 04:36 PM I've thrown away literally thousands of O-rings people decades ago thought would make sense to hoard in a cupboard. even in their sealed bags, they've ruined themselves with age 28-Apr-20 04:41 PM Hmm yes. CF looks much more costly compared to just upgrading KF seals. Prefer to be able to use existing parts to extent feasible. 28-Apr-20 04:41 PM I think this entire setup was less than $1k 28-Apr-20 04:41 PM If I can get this to drop a couple more orders of magnitude, then it may make sense to build a Ti sublimation pump, hot Ti powder getter, etc. and segregate them off in a low-lying branch of tubing without line of sight to the main chamber connection to keep the flakes away from the turbo intake. 28-Apr-20 04:41 PM Proper ion pumps probably beyond my machining resources currently, but that should at least count for something. 28-Apr-20 04:41 PM At what point does restriction of the turbo intake become limiting? DN-100 ISO-K flange components were costly enough that I immediately restricted the intake to KF-40, but I'm not sure how much that impacts ultimate vacuum 29-Apr-20 09:47 AM Things I have noticed over the years..... new clean stainless KF fittings with new proper o rings and clean new centering rings will perform as stated. Ones that have had years of use and grease smeared on them with questionable mating surfaces (as most of the ones all of us get off eBay and wherever or china) generally cannot break through the adsorbed gas barrier even with whatever baking your o rings will allow. Once you start using grease on one, forever will you continue using grease on it. This has been my experience over the last 20 years. I keep a box of stainless ones and good clean New o rings if I need something really clean. Otherwise I relegate KF stuff to foreline and other non critical things such as vacuum tube exhaust and furnaces where it really does not matter much. I know according to the data sheets they should be good down to the lower scales but my experience is that if you are looking to reliably get about the -6 scale just go over to Copper seal flanges or ISO. It’s a lot easier. 29-Apr-20 10:58 AM Conflat flanges with re-used copper gaskets sometimes work better than KF, even. 29-Apr-20 03:39 PM Interesting-- I had suspected the grease might not be removable in practice. Why is ISO preferable? I thought ISO flanges also used ordinary elastomeric seals. 29-Apr-20 03:39 PM Likewise the indicative ratings appear equivalent https://www.evpvacuum.com/newsview-255-447-Difference_between_CF_KF_and_ISO_Flanges.html 29-Apr-20 03:39 PM This also makes me wonder-- my turbo intake connection is DN-100 ISO-K. Doesn't that imply limitation to ISO/KF performance regardless of anything else connected to it? I haven't seen metal ISO-K gaskets in that size, though I wouldn't be surprised if they existed.... 29-Apr-20 03:53 PM The metal KF/ISO gaskets are for temperature purposes. Ratings on vacuum equipment are essentially saying "this seal leaks/offgasses at a rate inconsequential for anything above this," but leaks are additive. It's not at all uncommon to have every device conflat except the expensive ones like gate valves and turbos - that way there's no knife edge to damage. Pumping speed goes with the area of the pump, which scales faster than the leak rate across the perimeter. In molecular flow regime (HV/UHV) having a leak right beside your pump is very different than all the way at the other side of the chamber, if they sell it with ISO and list performance better than ISO spec they're confident the pump can handle that leak with negligible impact. 29-Apr-20 04:09 PM Leak rates are also lower. It is not solely a temperature issue-- I have at least managed to establish that. https://www.idealvac.com/EVAC-Aluminum-Metal-Knife-Edge-Seal-NW40-KF40-for-UHV-Seal-PN-NW-40-MS-A/pp/P103402 29-Apr-20 04:09 PM I neglected the matter of the seal being millimeters from the intake, though-- that's a good point. Nearly half the particles should immediately fly into the turbo intake. And if it is the only such connection, then all such leaked particles should largely just keep bouncing around the vicinity of the turbo intake regardless. Sooner or later most will fall in. 29-Apr-20 04:09 PM Ah these must be the associated high pressure clamps as well https://www.idealvac.com/EVAC-Metal-Seal/pl/2-90-1290-1082 29-Apr-20 04:16 PM What's the leak rate of a standard KF40 connection? 29-Apr-20 04:16 PM Their PDF says two orders of magnitude higher, neat. So you're right, they do work well into UHV 29-Apr-20 04:25 PM https://www.idealvac.com/Swagelok-VT-7-OR-128-Ultra-Torr-Vacuum-Fitting-Replacement-O-Ring/pp/P1010663 About 100x 29-Apr-20 04:25 PM Ah yeah 29-Apr-20 04:25 PM Was trying to find measurements by the same people to compare 29-Apr-20 04:25 PM It should still depend on circumference, but no two KF seals vary by a factor of 100x in circumference, so there must still be 1-2 orders of magnitude advantage. 29-Apr-20 04:25 PM This actually looks like over 400x 29-Apr-20 04:25 PM Plus greater temperature dependence, as you mentioned 29-Apr-20 04:25 PM Not sure whether their elastomer o-rings are genuinely better or if that is just marketing. If they are better than the Chinese ones, then the difference should be even larger than 400x between aluminum vs. Chinese o-rings. 29-Apr-20 04:25 PM Trade off is less reconfigurable, higher costs, etc. 29-Apr-20 04:25 PM Also less availability 29-Apr-20 04:45 PM I would also question the reproducibility of the aluminum gaskets. 29-Apr-20 04:50 PM Yes, less reconfigurable 29-Apr-20 05:09 PM Those chain clamps are available on ebay from china for less price 30-Apr-20 03:01 PM since my lab power supply really doesn't like the emi from my fusor I'm building a controll box for everything. Regulates the high voltage Power supply, chamber pressure, ion source and has a few interlocks for the high voltage as well as a power supply for my pirani 30-Apr-20 03:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200430_214638-0047D.jpg 30-Apr-20 03:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200430_234727-2873E.jpg 30-Apr-20 03:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200430_234938-D1096.jpg 30-Apr-20 03:01 PM and it has a 6 meter cable remote because r² 30-Apr-20 03:01 PM it's still missing a bit of relay logic and some opamp stuff for pressure regulation 30-Apr-20 03:01 PM goal is to build it as stupid as possible to prevent further emi issues 30-Apr-20 03:01 PM and yes, everything will get proper lables once it's done 01-May-20 09:25 PM ultrasonic soldering test: indium onto borosilicate 01-May-20 09:25 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/1588393505342-DAA1B.png 01-May-20 09:25 PM the bit on the right was left over from an earlier attempt with an ordinary iron and indium solder-- ultrasonic really does make a difference. 01-May-20 09:25 PM this is using the dedicated ultrasonic iron I just completed. for solder baths, immersing an ordinary ultrasonication horn into the bath is already sufficient seemingly. 01-May-20 09:25 PM https://www.japanunix.com/en/method/ultrasonic/ explanation of principle 01-May-20 09:25 PM supposedly it may also work on aluminum, titanium, tungsten, molybdenum, etc, though in some cases different alloys may be needed. more testing to follow. 01-May-20 09:25 PM interestingly, the tip of the iron does not need to actually touch the part. the energy is conveyed through the solder pool around the tip. 01-May-20 09:25 PM no flux is used. 01-May-20 10:46 PM I remember is some old literature titanium being spun/rubbed into glass or ceramic for bonding. They did not elaborate and referred to another article for details I could never find. 02-May-20 02:19 AM I discovered on more testing that titanium can be ultrasonically soldered with... um... Muggy Weld 02-May-20 02:19 AM Aluminum works great with it as well 02-May-20 02:19 AM Tungsten seemed to only work with nickel-copper solder (Bridgit brand, which I normally use on stainless steel) 02-May-20 02:19 AM Sn97-Ag3 worked best on stainless, just like with flux 02-May-20 02:19 AM On ceramics, indium alloys seemed best. Smoother surfaces were also easiest. 02-May-20 02:19 AM Aluminum also worked ok with zinc-based solder 02-May-20 02:19 AM It needs a lot of external heating as usual though, just like pieces of copper usually do. Thermal conductivity is too high for the iron to keep up. 02-May-20 02:19 AM In general all of these seemed easiest on a hot plate 02-May-20 02:19 AM During various failed experimental runs with alloys that turned out not to work well, I noticed the part surface was extremely reflective in the path of the tip, so coupling for oxide removal does seem to be working properly 02-May-20 02:19 AM Forgot to try molybdenum. I only have one decent moly plate and don't want to use it for testing, but I think I have some wire somewhere as well. 02-May-20 02:32 AM You should be able to wet tungsten and tantalum with indium 02-May-20 02:32 AM Muggy Weld 1 is Sn(40-49)-Zn(27-32)-Cd(19-33), which explains why it worked on aluminum and titanium. 02-May-20 02:32 AM Indium costs quite a lot more than Bridgit lol 02-May-20 02:33 AM for sure, just mentioning it. Stainless/indium doesn't work well usually 02-May-20 02:33 AM I have a large thin tantalum crucible dish somewhere that I could maybe test on. 02-May-20 02:33 AM Just have tons of indium at work 02-May-20 02:33 AM Indium worked badly on stainless yes. 02-May-20 02:33 AM It worked sort of ok on tungsten but I was surprised how well Bridgit tin-nickel-copper worked 02-May-20 02:33 AM Nickel copper alloys often used to braze tungsten though 02-May-20 02:33 AM Just very weird that I couldn't make it work with any flux I have, including the sketchy HF containing kind 02-May-20 02:33 AM Only ultrasonic 02-May-20 03:16 AM On further testing, molybdenum behaves very similarly to tungsten and gives excellent results with tin-copper-nickel solder, while nothing on hand seems to stick to tantalum except indium (which spreads over the surface in a manner similar to how it behaves on glasses and ceramics, with no obvious intermetallics) 02-May-20 03:40 AM yeah you shouldn't get intermetallics with In/Ta or In/W 02-May-20 03:40 AM In/Al can happen, In also sucks cobalt 02-May-20 03:40 AM and possibly nickel IIRC 02-May-20 05:51 AM Huh interesting. Should work for cobalt cemented carbide then. 07-May-20 02:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200507_231435-472B2.jpg 07-May-20 02:15 PM while cleaning my workshop I sorted through my vacuum stuff and realized that the turbo on my fusor is kind of wasted, both because I need nowhere near that low pressure and high pumping speed just resultry in more wasted deuterium 07-May-20 02:15 PM so I could move the drag pump onto that and use the turbo for a bigger chamber, the two iso-k 250 blind flanges would be pretty nice for that 07-May-20 02:15 PM but a chamber / piece of pipe with dn 250 flanges is very expensive 07-May-20 02:15 PM there's a piece of "pipe" with 155 mm length for 220 bucks on ebay 07-May-20 02:18 PM there's an ISO tee for 150 07-May-20 02:19 PM but is it iso 250? 07-May-20 02:19 PM I have lots of iso 100 and 63 stuff here 07-May-20 02:20 PM can't you adapt easily? 07-May-20 02:20 PM that would kind of defeat the purpose 07-May-20 02:20 PM I am imagening a iso 250 chamber with dn 100 ports for pump, viewport etc 07-May-20 02:21 PM I misread, I thought you were saying you needed dn250 and complaining about it being iso250 - I don't use DN names 07-May-20 02:23 PM Put a couple of meters of KF40 flexible hose between the pump and the chamber to cut down on the pumping speed? 07-May-20 02:23 PM And get a pumping station as a bonus? 07-May-20 02:30 PM I've got a throtteling valve already, but ideally I'd like to separate the fusor from the turbo, use the fusor standalone and the turbo with a big chamber for experiments 07-May-20 03:11 PM Whats the diff between iso and dn?? 07-May-20 03:13 PM iso is the standard and dn is just the short for "diameter", mixed that up a bit 07-May-20 03:14 PM OH. that's what dn means 07-May-20 03:15 PM durchmesser nennweite diameter nominal size 07-May-20 03:15 PM I am now realizing it might just be diameter nominal and not the german variant 07-May-20 03:22 PM All I know is when someone says "DN100" there is no certainty as to what flange they are talking about 07-May-20 04:35 PM man I had almost forgotten how much fun this pump is 07-May-20 05:17 PM Iso250 stainless flange for welding is like $150 07-May-20 05:17 PM I wonder if that's something a lathe could make easily 07-May-20 05:18 PM it's really easy to make on a lathe 07-May-20 05:18 PM issue is 07-May-20 05:18 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200508_021931-162DC.jpg 07-May-20 06:22 PM if you're not going UHV you can use aluminum on a simple cnc router 07-May-20 10:10 PM https://youtu.be/703_IgTRRxY here is a video showing a little bit of the process for making one off small tubes. Just playing around with the idea of making a comprehensive video. This is just a sort of trial run. I did not bother even cleaning up. It’s an unlisted video so please just keep it to interested people here as I do not want the audiofool crazies messaging me at all hours wanting better tone. Etc etc. let me know what you think. 07-May-20 10:40 PM I had another section going over the exhaust methods but the sound was bad and I figured that should be it’s own thing. In it I broke down the cathodes and RF bombarded. 07-May-20 10:40 PM So I will do that at another time. 08-May-20 03:29 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-2B749.png 08-May-20 03:29 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-64DC2.png 08-May-20 03:29 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-B76D3.png 08-May-20 03:29 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-77689.png 08-May-20 03:29 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-75E81.png 08-May-20 03:29 AM this is still the funniest pumping principle imo 08-May-20 04:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200508_131117-D3436.jpg 08-May-20 04:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200508_133651-98BB0.jpg 08-May-20 04:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200508_133902-EA43D.jpg 08-May-20 04:58 AM All cleaned and back together 08-May-20 05:06 AM wow this thing is silent 08-May-20 05:47 AM Using the drag pump for the fusor sounds more suitable definitely. 08-May-20 05:47 AM Ah nice. Yeah these probably don't even care if the system vents to atmosphere. 08-May-20 07:55 AM why are there so many cryopumps on ebay 08-May-20 07:55 AM but virtually no compressors for them? 08-May-20 08:00 AM that is indeed a very good question 08-May-20 08:01 AM And everything is in America... 08-May-20 08:20 AM Because the pumps get scrapped as they are a nice big lump of metals. 08-May-20 08:20 AM The guy with the bins and flatbed pickup grabs that cause it looks like money, but the actual pump he is not sure what to do with. 08-May-20 08:20 AM Oh and also, and probably most likely many big labs have compressors that drive multiple cryos 08-May-20 08:20 AM The compressor might just look like a roll around air conditioner in the corner when his eye is drawn to all the stainless steel goodness of the pump. 08-May-20 10:06 AM :p 08-May-20 10:39 AM isn't it because they use harsh gasses and the vacuum-side gets mildly damaged ? 08-May-20 10:39 AM @GigaSquirrel can you post a zip with the photos/videos of that? I want to share with someone 08-May-20 10:49 AM sure gimme a sec 08-May-20 10:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Drag_Pics-CCE75.zip 08-May-20 10:49 AM there 'ya go 08-May-20 11:08 AM thanks! 08-May-20 11:08 AM do they make ISO-250F drag pumps? 08-May-20 11:08 AM doesn't look like it. Would be sweet 08-May-20 11:09 AM heh, would be fun 08-May-20 12:27 PM It's interesting that my helium compressor is quite a bit smaller than the cryopump, yet has enough capacity to supply more than 3 cryopumps of the same size 08-May-20 12:27 PM The compressor is heavy though, like ~80 kg iirc. Luckily it is on wheels 08-May-20 12:33 PM you got the one that didn't get delivered to me, right? 08-May-20 12:33 PM Yeah, it still had your name on it 08-May-20 12:33 PM ahahaha 08-May-20 12:33 PM now that's a new kind of doxxing 08-May-20 12:34 PM Well it was two layers of paper, everything was double wrapped. Judging from the thickness of the original packaging, I suspect it would not arrive in Germany in one piece 08-May-20 12:34 PM The weight of the compressor was enough to crack one pallet under it 08-May-20 12:35 PM yeah the seller didn't strike me as someone who knows what this is or how to ship it 08-May-20 12:43 PM in the mood for more turbo stuff 08-May-20 12:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200508_212119-B3E96.jpg 08-May-20 12:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200508_212139-EA665.jpg 08-May-20 12:43 PM let's see if this thing is somehow salvageable 08-May-20 12:44 PM Snip off the blade on the opposite side 08-May-20 12:44 PM And pray 08-May-20 12:44 PM Hopefully the stators are not too damaged? Does it turn at all? 08-May-20 12:45 PM it spins absolutely freely 08-May-20 12:45 PM that will be the solution if I can't remove that stage somehow (I don't think I can) 08-May-20 12:45 PM but first I want to take it apart and check for more damage 08-May-20 12:45 PM who knows 08-May-20 12:46 PM At least that means the bearings is not shredded 08-May-20 12:46 PM So your drag pump also has this type of arrangement right? It goes down and up and down? 08-May-20 12:46 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-42EC8.png 08-May-20 12:46 PM That picture is the drag stage of an Edwards EXT255Hi 08-May-20 12:48 PM I have no idea what that diagram is supposed to be showing 08-May-20 12:48 PM It's so cluttered, especially with the hashing 08-May-20 12:48 PM aye 08-May-20 12:49 PM Arrows show the gas flow direction. It's a very compact pump, and they didn't do a good job with hashing to make it clear. 08-May-20 12:49 PM They should've adopted the same hashing pattern for things that turns, and another for things that are stationary, after that apply color to different parts 08-May-20 12:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200508_215624-89B8A.jpg 08-May-20 12:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200508_215751-2F1EB.jpg 08-May-20 12:58 PM all looks to be in perfect condition 08-May-20 12:58 PM so now im wondering 08-May-20 12:58 PM how did that vane fall off 08-May-20 12:58 PM And where is it now? 08-May-20 12:58 PM No debris, no shrapnel? 08-May-20 12:59 PM got it without it 08-May-20 12:59 PM nothing 08-May-20 12:59 PM no metal powder, no scratches in stator or rotor 08-May-20 12:59 PM it must have popped off away from the assembly 08-May-20 12:59 PM ...somehow 08-May-20 01:04 PM Then you don't have to take it apart any further from this point. 08-May-20 01:04 PM I know, I wasn't going to ^^ 08-May-20 01:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200508_220523-29A77.jpg 08-May-20 01:04 PM that black line under the last holweck stage is the only sign of dirt / use I can find 08-May-20 01:05 PM I eventually need to get back to fixing my EXT70. 08-May-20 01:06 PM I wonder how much pumping speed it has lost just from one missing blade 08-May-20 01:06 PM Or two actually 08-May-20 01:17 PM @GigaSquirrel the pics you posted above the turbo are a drag pump? 08-May-20 01:18 PM the small one are drag, the recent bigger one is turbo 08-May-20 01:18 PM (with a drag stage or two) 08-May-20 01:19 PM the graphic design on that "Turbo-V 300HT" label in blue is really aesthetically pleasing 08-May-20 02:21 PM https://www.youtube.com/watch?v=PErii9C2Jkk 08-May-20 02:23 PM Your people? 08-May-20 02:24 PM https://knowyourmeme.com/memes/the-song-of-my-people 08-May-20 02:27 PM the leybold 1000C is like an octave lower and five times as loud (not that the video makes gauging that part easy) 08-May-20 02:27 PM never ran one without it being bolted to like 200kg minimum though 08-May-20 02:50 PM oh wow 08-May-20 02:50 PM it's now 40 minutes after turning it off and I can still hear it spin 08-May-20 02:55 PM good bearings and your attempts to hold it stable are good enough I guess! 08-May-20 02:57 PM Yep 08-May-20 03:48 PM 1h20 08-May-20 03:48 PM that's a bit... excessive 08-May-20 03:49 PM Hmm, I'm curious how long my Leybold T1600 will spin if I can somehow disable the automatic braking 08-May-20 04:09 PM you could probably do a rough etimate based on power consumption while running (to find friction) and mass of the rotors + initial inertia 08-May-20 04:14 PM I don't know the rotational inertia of the rotors or their mass 08-May-20 04:14 PM But the pump weighs 40 kg, so they're not light 08-May-20 11:25 PM We have RF gain 08-May-20 11:25 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-3ECF8.jpg 08-May-20 11:25 PM 14.31818 MHz is the highest fundamental crystal I have. This is the first time I have tried my little triodes at RF 08-May-20 11:25 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-18DE4.jpg 08-May-20 11:25 PM This one is made of commercially made parts from sylvania. I have a design of my own made with my own parts as shown in the you tube video. Those work in this circuit too. 08-May-20 11:25 PM I think the old saying at bell labs as they designed the transistor was what’s the proof of gain? Does it oscillate? Then it has gain. mu of these tubes are in the mid 30’s 09-May-20 05:49 AM Nice! 09-May-20 10:32 AM Also here's what a velocity map imaging time of flight spectrometer looks like in simulation: 09-May-20 10:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-20EEA.png 09-May-20 10:32 AM where the three electrodes are just something like this with clips connected to an SHV feedthrough: 09-May-20 10:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-13991.png 09-May-20 10:32 AM spacing insulators of MACOR 09-May-20 12:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_213158-49D99.jpg 09-May-20 12:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_204656-8E01A.jpg 09-May-20 12:43 PM more turbo repair stuff! 09-May-20 12:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_134436-A697E.jpg 09-May-20 12:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_134455-155A9.jpg 09-May-20 12:43 PM this rotor needs to be replaced 09-May-20 12:56 PM Can't it be cleaned? 09-May-20 01:22 PM nah that's corrosion 09-May-20 01:33 PM something something chemicals 09-May-20 01:51 PM something something ballance 09-May-20 02:45 PM @samy Thank you for sharing the diffraction grating chocolate on twitter. I'm happy to get to share that with others. 09-May-20 02:46 PM cool, thanks for sharing! 09-May-20 02:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_222133-725B3.jpg 09-May-20 02:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_222144-49A84.jpg 09-May-20 02:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_223358-BBD09.jpg 09-May-20 02:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_225957-74CE9.jpg 09-May-20 02:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_223608-5E7D1.jpg 09-May-20 02:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_233325-61BE6.jpg 09-May-20 02:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_234016-EEE73.jpg 09-May-20 02:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_235110-65CE6.jpg 09-May-20 02:50 PM was way more of a struggle than yesterday, but it's all together 09-May-20 02:56 PM I've enjoyed watching the project as it developed. It's the kind of thin film coating/interference work my dad loved. 09-May-20 03:56 PM @samy your tweet really blew up :) 09-May-20 04:08 PM @nmz787 haha that was a surprise 09-May-20 04:08 PM @GigaSquirrel nice!! all blades are in tact there, is that the same or different pump? or am i looking at the other side of it? 09-May-20 04:08 PM @funranium oh cool - what kind of work did he do? any areas there that got you really interested when younger? 09-May-20 04:13 PM in this one all blades are intact, but the original rotor was corroded as hell 09-May-20 04:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200510_002033-FB42D.jpg 09-May-20 04:13 PM the one in red is the turbo I repaired yesterday, left to it is the drag I did yesterday, right is the turbo I did today 09-May-20 04:13 PM I just started with the big turbo behind it, but that's not gonna be as quick and easy 09-May-20 04:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200510_004714-ABAF2.jpg 09-May-20 04:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200510_005319-34F3C.jpg 09-May-20 04:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200510_005928-409EE.jpg 09-May-20 04:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200510_005939-0F58D.jpg 09-May-20 04:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200510_010005-37F34.jpg 09-May-20 04:27 PM are all those are from that junkyard you visit? 09-May-20 04:27 PM quite a variety of turbos there 09-May-20 04:28 PM the drag, turbos with white caps and the small one are 09-May-20 04:28 PM they're just a part of what we got from there 09-May-20 04:28 PM I only took what I have controllers fore, the rest is at my ex'es place 09-May-20 04:29 PM that is quite a score 09-May-20 04:29 PM oh yes 09-May-20 04:29 PM now that I have a lot of free time I can finally work on them 09-May-20 04:30 PM get the controllers sorted and you can use one (or more...) as basically a disposable turbo heh 09-May-20 04:32 PM that's what the drag is for 09-May-20 04:32 PM doesn't mind being vented to atmosphere 09-May-20 04:32 PM I also have a tiny oildiff with silicone oil that can be vented 09-May-20 04:32 PM I really don't want to crash a turbo 09-May-20 04:32 PM even if it was disposable it still is really dangerous 09-May-20 06:11 PM @samy When he was younger he was a process and coating engineer at Monolithic Memories and then Harris. Ended in sales for semiconductor chemicals at Canon. If he hadn't slipped a rare bottle of photoresist under the table as a "sample" to two researchers, the Cosmic Background Observer never would have happened. 09-May-20 06:48 PM Hahahaha 09-May-20 06:48 PM I love stories like that. Corporate management mentality back then totally hurt research. Nowadays it’s venture capitalist mentality hurting research. 09-May-20 10:47 PM haha so cool 09-May-20 11:05 PM And really, the lesson he taught me better than any other is that no matter what scientific or technical field you’re working in, you never get to do that to the exclusion of people and personalities. Which is part of how I ended up in safety and found joy in it. 09-May-20 11:26 PM that's really admirable, and i've really appreciated your help with previous safety questions i've had! 09-May-20 11:26 PM i love to play in some unsafe areas but don't have any training...and want to practice reasonable safety measures but stubborn enough to continue if i'm not really sure if the measures i've taken are actually reasonable :\ 09-May-20 11:26 PM so real knowledge is super valuable to me there 10-May-20 04:02 PM Too bad this is only the controller. No sensors. 10-May-20 04:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200510_191516-A929B.jpg 10-May-20 04:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200510_191506-B9F07.jpg 10-May-20 07:41 PM what are you going to do with it? 11-May-20 10:37 AM I only took what I have controllers fore, the rest is at my ex'es place @GigaSquirrel How about the others? Do they use Induction Motors? I am currently working on a turbo controller which may be usable for your turbos as well, given that it is universal enough to drive an old lathe's induction motor as well Which controller did you use to spin your Varian TV-300? I wonder whether it fits my TV-301 Navigator as well. I'm curious how fast it does spinup and what voltage and frequency profile it uses. 11-May-20 10:39 AM for the varian I was lucky enough to get the controller with it, a turbo-V 300 c.u. 11-May-20 10:39 AM tmps are a totally mixed bag, some are 1, 3 or even 4 phase bldc, some with hall feedback, some with emf feedback 11-May-20 10:39 AM spinup is usually in 1-3 minutes, depending on size, seems pretty linear to me 11-May-20 10:39 AM voltage is usually pretty high, 50-100V 11-May-20 10:39 AM my varian wants 90V, my small balzers 70, the turbovac 150 ~80V iirc 11-May-20 10:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200511_193617-C2173.jpg 11-May-20 10:54 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200511_194533-00E8F.jpg 11-May-20 10:54 AM who in their right mind heat shrinks a rotor 11-May-20 12:21 PM for the varian I was lucky enough to get the controller with it, a turbo-V 300 c.u. @GigaSquirrel well that one doesn't seem to be compatible with my two TV-301. But I still assume that they have very similar motors, given that both speed and voltage are identical. As I am building my own controller I am interested in your controller's sine filter (a network of three inductors and three capacitors), i.e. inductor core type (iron/ferrite) and the capacitance of the capacitors. Could you please take a picture of the controller's PCB? tmps are a totally mixed bag, some are 1, 3 or even 4 phase bldc, some with hall feedback, some with emf feedback @GigaSquirrel I'm very confident that the "3 phase bldc emf feedback" actually use asynchronous induction motors just like your Varian TV-300 does. I can help you to spin them if you like. I guess I could also help getting a turbo with hall sensors to spin, but I haven't done such yet 11-May-20 12:26 PM yep, I just realized the pump is not bldc with permanent magnets but induction 11-May-20 12:26 PM I can take my driver apart tomorrow if you're interested, I haven't looked in it yet 11-May-20 12:26 PM I have drivers for everything but the 4 ph balzers, I'm building a driver for that as an excuse to get comfortable with stm32 11-May-20 12:26 PM But thanks for the offer 11-May-20 12:34 PM I'm going to use an stm32 as well, as many of them have a specialized timer that has 3-phase complimentary output and deadtime insertion all included. Did that in software using an AtMega, but I am looking forwared to get things improoved by having more MCU to work with. Personally I prefer my STM32's with CubeMX and Makefile. Adding a make target for the programmer makes things better I can take my driver apart tomorrow if you're interested, I haven't looked in it yet @GigaSquirrel That'd be awesome! 12-May-20 07:31 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200512_162904-4022A.jpg 12-May-20 07:31 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200512_162917-D6FB8.jpg 12-May-20 07:31 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200512_162939-F10EF.jpg 12-May-20 07:31 AM @analogmultiplizierer there's no filter to speak of 12-May-20 07:55 AM I hate this pump 12-May-20 07:55 AM from the bottom of my heart 12-May-20 07:55 AM not only is the rotor heat shrunk on the shaft, but also the bearings are pressed onto it 12-May-20 07:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200512_161218-6D74A.jpg 12-May-20 07:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200512_161235-4D7FE.jpg 12-May-20 07:55 AM and they're some weird custom ones with grease ports in the shielding 12-May-20 07:55 AM this pump is absolutely not made to be serviced 12-May-20 07:55 AM you have to dismantle it completely to change bearings, ruining any chance of keeping the original balance 12-May-20 08:14 AM Edwards EXT70 pumps supposedly have the magnetic rings with same polarity facing each other. I’m pretty terrified about fitting that back together. 12-May-20 08:14 AM my balzers pump has a magnetic bearing 12-May-20 08:14 AM that requires quite some force to reassemble 12-May-20 08:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200509_230756-1FCA6.jpg 12-May-20 01:29 PM @analogmultiplizierer there's no filter to speak of @GigaSquirrel I'll assume it's fine to run my turbos without any filtering. I can't imagine any noteworthy issues inside thje induction motor anyways Thank you really much for the pictures! 12-May-20 02:11 PM none of my turbos sound very sine, if you get what I mean 12-May-20 02:11 PM I'm giving away my oildiff to a friend of mine and I just want to show everyone how tiny and cute those things can be 12-May-20 02:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-A0A4D.png 12-May-20 02:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-64899.png 12-May-20 02:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-36F60.png 12-May-20 02:14 PM wow such a small package, very cool 12-May-20 02:14 PM it's 220 W peak and rated at 40 l/s 12-May-20 02:41 PM wow that’s sweet 12-May-20 09:48 PM I have one half that size around here somewhere. 13-May-20 01:10 AM whaaaat 13-May-20 01:10 AM I'd love to see pics of that! 13-May-20 08:01 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-7FF5D.png 13-May-20 08:01 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-8BB1E.png 13-May-20 08:01 AM built a puller for the leybold turbovac 150 / 360 13-May-20 08:01 AM not the prettiest, but it works 13-May-20 08:02 AM I think it's beautiful 13-May-20 08:02 AM thanks 13-May-20 08:03 AM it's got curves in all the right places 13-May-20 08:03 AM XD 13-May-20 08:03 AM I've come to passionately hate that series of pump 13-May-20 08:03 AM 150, 151, 360, 361 13-May-20 08:03 AM definitely not made to be serviced 13-May-20 08:04 AM I've got several balzer/pfeiffers to tackle in the coming weeks, not looking forward to the little ones 13-May-20 08:05 AM I've done a small balzers (TPH062) a few days ago, that was pretty nice 13-May-20 08:05 AM only stator reassembly is a bit finniky 13-May-20 08:05 AM yea I thought I recognized that photo, got two of those to do 13-May-20 08:06 AM what issues do they have or is it just a bearing change? 13-May-20 08:06 AM or it may be the 060 13-May-20 08:06 AM yea 060's 13-May-20 08:06 AM one just needs the connector replaced (afaik) and the other is a bearing 13-May-20 08:08 AM if they're like the 062 (which I'm gonna assume) that will be easy 13-May-20 08:08 AM only the bottom bearing is a real bearing, top is maglev 13-May-20 08:08 AM yea they look identical aside from some port locations 13-May-20 08:08 AM undo a few screws and it basically falls out, no need to unpack the stator etc 13-May-20 08:08 AM connector will be a bit annoying to solder as it's all a bit small, but far from impossible 13-May-20 08:09 AM for the replacement connector I got the solder infused style where I just gotta hit it and shove 'er in so that should help with the sanity 13-May-20 08:09 AM the pins are basically just already occupied with solder is all 13-May-20 08:10 AM ah sweet 13-May-20 08:11 AM that "invention" strikes me very much as the original engineers being like "fuuuuuuck this" while still in R&D 13-May-20 08:11 AM if you need reference pics of anything, I've got a second almost complete but disasselbled tph062 here 13-May-20 08:14 AM hopefully I'll get to them soon, they've all been sitting around for a couple months now =\ 13-May-20 08:17 AM heh, yeah, mine have been lying around for over a year 13-May-20 08:17 AM but the current situation gives me a lot of free time and motivation to work on stuff 13-May-20 08:27 AM whoops 13-May-20 08:27 AM my turbovac 360 just came 13-May-20 08:27 AM and it's got about 10° of rotational freedom 13-May-20 08:34 AM Yea sounds like your current tasks are well suited given the situation - I mean acquiring pumps for cheap and flipping them (not sure if you planned on it, but I just assume) 13-May-20 08:34 AM I snagged most of my pumps for cheap off ePay with that intention as you rarely see a pump + cable + controller anywhere, and I don't mind making some proper cables 13-May-20 08:43 AM not sure about selling them tbh 13-May-20 08:43 AM sure, would be a nice source of income 13-May-20 08:43 AM but they're not exactly safe are they 13-May-20 08:43 AM "rotor spins freely, but it might need new bearings" 13-May-20 08:46 AM lol 13-May-20 08:46 AM ebay? 13-May-20 08:48 AM yep 13-May-20 08:48 AM now if only I had some sort of device to get the rotor off of there... 13-May-20 08:48 AM sellers are cocksuckers more often than not, IMO. "works great, tested, as-is" uhhhuh, makes sense to be as-is, eh? 13-May-20 08:48 AM well, I'm not gonna complain on a 50€ pump 13-May-20 08:49 AM yea for that situation I'd say you know what you're likely getting though 13-May-20 08:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200513_175428-FFE49.jpg 13-May-20 08:55 AM mmmm, powdered donut 13-May-20 08:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200513_175643-8C761.jpg 13-May-20 08:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200513_175740-955CC.jpg 13-May-20 08:59 AM what even is that stuff 13-May-20 08:59 AM man I'm looking forward to my ultrasonic cleaner 13-May-20 09:12 AM I will try to dig out that little diffusion pump. It’s a 1” inlet and like a tiny 3/8” outlet. Like 50 or 70 watts and the cooling is just a 1/4” copper wrapped around a couple times and brazed in place. It was an actual product from a company and I have seen perhaps 3 over my years. Cute little guy. 13-May-20 09:12 AM I had hopes of making copies one day but never for around to it. 13-May-20 09:12 AM Would be the perfect pump along with one of the current cheap two stage direct drive pumps out there to build little fusors or evacuate a single tube or small laser, etc... 13-May-20 09:26 AM none of my turbos sound very sine, if you get what I mean @GigaSquirrel I sure do. Sine Filters can be used to reduce EMI. Afaik filtering may also be used to reduce wear/friction on the motor caused by eddy currents from the pwm waveform. I don't think that the latter is noteworthy as the motors windings have significant inductance 13-May-20 10:23 AM @GigaSquirrel I know what that stuff is. It's what killed the bearing, that's what it is. 13-May-20 10:24 AM is it gritty? 13-May-20 10:24 AM not at all 13-May-20 10:24 AM really fluffy 13-May-20 10:24 AM perhaps an o-ring or other rubber? 13-May-20 10:24 AM a friend suggested the bearing died, heated up and that's the ash of the grease 13-May-20 10:25 AM sounds plausible 13-May-20 10:25 AM have you tested the windings yet? sane resistance? (my concern is heat that close to them) 13-May-20 10:27 AM I've just connected them up to my driver and they sing the leybold startup melody and the rotor starts spinning 13-May-20 10:27 AM so then yes, yes you have, lol 13-May-20 10:28 AM yeah 13-May-20 10:28 AM the driver has lots of safety features 13-May-20 10:28 AM so I'm not worried it kills anything (including itself) when testing 13-May-20 11:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200513_201042-2E235.jpg 13-May-20 11:18 AM she cleans up well 13-May-20 11:18 AM also beware the ultrasonic bath on stuff like this, you CAN damage with it and thin coatings (e.g. probably your blades) can easily be fouled up especially if they're brittle (which they likely are) 13-May-20 11:18 AM I speak from experience in flaking off a coating from the impellers on the first pump I rebuilt 13-May-20 11:21 AM heh, I'll watch out for that 13-May-20 11:21 AM may be that the rotor doesn't need any cleaning 13-May-20 11:21 AM but the stators definitely do 13-May-20 11:22 AM always bath your most delicate parts first so you don't have muck in solution that impinges on surfaces 13-May-20 11:22 AM an active filtration system (e.g. not cheap china/amazon baths which are essentially sinks with transducers attached to the bottom) will help lots if you're dealing with delicate things 13-May-20 11:22 AM and aluminum in particular I've found will react with cleaning solutions while being bathed that it otherwise wouldn't react with 13-May-20 11:25 AM why is everything related to vacuum always trying to kill itself 13-May-20 11:28 AM Similar to ultrasonic soldering hmm. Aluminum can be soldered much more easily with ultrasonic tools. 13-May-20 11:30 AM no need for ultrasonic there, 150 Hz works just fine 13-May-20 11:30 AM that's at least the frequency I tig it at 13-May-20 11:33 AM AC TIG welder, very nice. 13-May-20 11:33 AM I tried DCEN but definitely no luck with that. Granted, no helium or wide bore gas shield cup. DCEP is supposed to work well for smaller pieces but only low current is feasible against the tungsten. May try to hack something together from that old buzzbox sometime. 13-May-20 12:18 PM All of these reasons are why I avoid turbos. Just too much trouble. 13-May-20 12:19 PM no need for He 13-May-20 12:19 PM I've got 200 amps maps and straight argon, never had any issues 13-May-20 12:24 PM Helium isn't needed for AC TIG. It's sometimes suggested for DCEN TIG on thick aluminum. DCEP TIG uses straight argon as well. 13-May-20 12:24 PM DCEN is fundamentally difficult because of the polarity relative to the oxide layer. 13-May-20 12:24 PM DCEP tends to melt the tungsten beyond pretty limited current 13-May-20 12:24 PM AC is much better, machine just costs 3x more money 13-May-20 01:13 PM got my machine for ~600 13-May-20 01:13 PM was well worth it 13-May-20 03:04 PM I think I paid around that for my drytel 30 13-May-20 03:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200514_003654-CD8DA.jpg 13-May-20 03:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200514_003521-41022.jpg 13-May-20 03:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200514_004116-AB775.jpg 13-May-20 03:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200514_004225-C3C14.jpg 13-May-20 03:50 PM so it turns out turbos can take quite the punch 13-May-20 03:50 PM because this one ripped apart the bearings cage 13-May-20 04:04 PM gnarly 13-May-20 04:09 PM but no visible damage to the rotor or stator 13-May-20 06:50 PM That’s comparable to mine, although mine did have broken magnets. 13-May-20 09:15 PM Found it. Isn’t it cute. 13-May-20 09:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-5A66B.jpg 13-May-20 09:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-FBACC.jpg 13-May-20 09:15 PM And it actually works too. I think it’s a 30 ml charge 13-May-20 09:15 PM Two jets. 13-May-20 09:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-33F60.jpg 13-May-20 09:15 PM and while im out here. 13-May-20 09:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-72947.jpg 13-May-20 09:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-A06F9.jpg 13-May-20 09:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-E56C1.jpg 13-May-20 09:15 PM One of my RF induction heater generators 13-May-20 09:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-0960A.jpg 13-May-20 09:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-C3429.jpg 13-May-20 09:15 PM If anybody can find a data sheet for this I would be shocked! I have been looking for years. 13-May-20 09:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-7B31F.jpg 13-May-20 09:15 PM That 50 amp RF ammeter is in the tank circuit. 13-May-20 09:15 PM Not the output coil! 13-May-20 09:15 PM I rarely have it above 20 for the little tubes I make. And I have a big step down coil on the output so it’s very lightly loaded for what I do. RCA used these direct out to the multi turn loading coils in house so it was 8000 pk to pk out on a work coil at some tens of amps. That’s guts right there! 14-May-20 01:47 AM that's some pretty neat stuff you've got there! 14-May-20 01:47 AM and man, that diffpump is soooo cute! ❤️ 14-May-20 03:29 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-A7E95.png 14-May-20 03:29 AM ultrasonicator arrived! 14-May-20 03:29 AM time to completley ruin my stators 14-May-20 06:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-BFCD6.png 14-May-20 06:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-A70BC.png 14-May-20 06:25 PM What are you cleaning them with? 14-May-20 06:25 PM What’s with the aluminum foil? 14-May-20 08:25 PM Looks like realizing the sonicator will eat it 14-May-20 08:32 PM The ultrasonic cleaner will create tiny cavitation bubbles on top of the foil and puncture/erode it. A uniform distribution of erosion is a good sign that the cleaner is working as intended 14-May-20 10:33 PM TIL! 15-May-20 12:44 AM I'm cleaning them in a solution of this 15-May-20 12:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/frosch-orangen-universalreiniger--10001991-08DCC.png 15-May-20 12:44 AM just some general purpose household cleaner 16-May-20 07:37 AM Are you rinsing and sonicating with acetone afterwards? 16-May-20 07:37 AM Is there a risk of leaving detergent residue on the parts? 16-May-20 07:46 AM I'm rinsing them in deionized water afterwards 16-May-20 09:09 AM I’m running out of DI water! Yesterday I cleaned parts in degreaser and tap water then hot tap water rinse then a rinse in denatured alcohol. I am guessing these tubes will not look very good. Everything reactive should cook out but the refractory remains will be ugly. 18-May-20 04:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200518_123055-7BE38.jpg 18-May-20 04:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200518_124407-341F8.jpg 18-May-20 04:24 AM Penning gauge in use 18-May-20 07:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200518_160201-F502B.jpg 18-May-20 07:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200518_160221-D0CF6.jpg 18-May-20 07:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200518_160720-FD94E.jpg 18-May-20 07:27 AM the little drag that could 18-May-20 07:27 AM e-5 mbar at like 7l/s without baking 18-May-20 10:00 AM coool :D 18-May-20 10:17 AM now I know both gauge and pump work 18-May-20 10:17 AM pump will go on the fusor, gauge will go on my big new chamber 18-May-20 10:17 AM once I care to drill into it to weld new flanges 18-May-20 11:33 AM Nice, the penning/pirani combi agrees with the pirani down to the last significant digit 18-May-20 01:32 PM Below a pirani gauge measurements it’s not really absolute anyways. You are looking at relative change. 18-May-20 01:37 PM https://www.youtube.com/watch?v=D7pnOSliTm0 testing the diffraction of sound waves through a single slit, specifically listening for the interference pattern as well as the dispersion of frequencies which is pretty "visible" 18-May-20 01:37 PM sorry for the annoying pitch, wanted shorter wavelengths so that the setup didn't have to be too large 18-May-20 01:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200518_225808-13178.jpg 18-May-20 01:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200518_225815-BB980.jpg 18-May-20 01:59 PM chamber to be with turbo to be 18-May-20 01:59 PM if the seller would finally deliver the bearings for my tmp... 18-May-20 02:54 PM @samy i didn't notice a change in the frequencies, where was I supposed to be looking? 18-May-20 02:54 PM Was looking mostly at the two central nodes 18-May-20 04:42 PM @nmz787 the frequencies themselves won't shift, but rather disperse over space (I was only playing two as you can see and are at the same amplitude when centered) 18-May-20 04:42 PM of course there are a ton of reflections and this was done inside so you still see the other one, but you can visibly see the interference pattern created, and can also tell that it's frequency dependent 18-May-20 04:43 PM Ah, I thought those two peaks were from interference 18-May-20 04:43 PM ahh 18-May-20 04:43 PM Will watch again 21-May-20 11:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200521_205226-94F17.jpg 21-May-20 11:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200521_205235-CCF37.jpg 21-May-20 11:53 AM making my own iso-250 rings because no way in hell I'm paying 60€ per 21-May-20 11:53 AM rings are just nbr, but that's good enough as a start 21-May-20 11:53 AM still need the rings that controll distance between the flanges, the material for those is still in the mail 21-May-20 12:08 PM Depending how well you support stuff / torque stuff off the side of the flange, you'll want to do a pretty good job making the centering ring and not having over or undersized o-rings. 21-May-20 12:29 PM yep 21-May-20 12:29 PM I mean I'll do my best regardless 21-May-20 12:35 PM Make your own as in, you have a long string of NBR and you're cutting and fusing the ends to make a ring from the string? 21-May-20 12:37 PM I bought fittng o-rings and am making the metal ring for them 21-May-20 08:54 PM Your throughput is going to be awfully low with that plastic cap in there! . Looks pretty good. 21-May-20 10:03 PM https://youtu.be/OSpGuzMxiwI Here is a clip I just shot of RF heating aluminum clad anode material. 22-May-20 01:14 AM Nicely not-melted 22-May-20 09:17 AM I have shrink wrapped a tube before while messing around with the RF generator and not paying attention. Especially soft glass tubes. They will fold up nicely on themselves! 26-May-20 09:54 AM turns out glass to metal (Boro to W) seals aren't as hard as I thought 26-May-20 09:54 AM I haven't done a leaktest, but the discharge color doesn't change with He or IPA on the seal 26-May-20 10:36 AM Well done 26-May-20 12:47 PM Thanks 26-May-20 12:49 PM What color is the metal in the seal area? Is it Pyrex or Duran? Thin wires seal pretty easily. For sealed off tubes however you need a proper diffuse layer of oxide. Red to gold for tungsten or it will seep. Not full on leak, but gat will slowly migrate through. 26-May-20 12:50 PM wire is black with a hint of red 26-May-20 12:50 PM If you want some Nonex 7720 to bead the leads first I can send you some, or if you want some pre beaded leads I can send you some as well. 26-May-20 12:50 PM but I think my wire has some coating on it as it's already black to begin with 26-May-20 12:51 PM Black to red means it was not held at temperature long enough. It may turn more red over the course of a day or so. If it goes all red the. You have it 26-May-20 12:51 PM the glass is just "Borisilicate", no Idea what exactly, it's cheap stuff from ebay 26-May-20 12:52 PM Oh.. easy.... degrease the wire then dip in a mix of ammonia (household stuff is fine) and a bit of hydrogen peroxide and agitate. 26-May-20 12:52 PM This will break down that layer 26-May-20 12:52 PM Pretty quickly 26-May-20 12:52 PM Then if you want to get fancy fire it in hydrogen or just plain burn it in a hydrogen flame. 26-May-20 12:52 PM Or clean with fine sand paper. 26-May-20 12:53 PM cool, thanks for the tips! 26-May-20 12:53 PM Not done yet 26-May-20 12:54 PM I'll try etching it tomorrow, I don't have a hydrogen setup 26-May-20 12:54 PM It’s critical to produce a clean oxide layer of fine grained yellow 26-May-20 12:54 PM So get the wire red hot in the area you want it to seal then pull the flame away. This will build up an oxide layer 26-May-20 12:55 PM I did that 26-May-20 12:55 PM It will start blue, then on subsequent heats go yellow. 26-May-20 12:55 PM Ok. When sealing make sure you heat after you press. Gotta get the glass back up to flow temp. Usually requires an additional final press due to droop from the reheat. This gives time for the glass to@wet the oxide and let it diffuse. 26-May-20 12:57 PM hmm, yes 26-May-20 12:57 PM so many things I gotta try tomorrow 26-May-20 12:57 PM oh, also 26-May-20 12:57 PM do you think it would be possible to do bigger parts in the oven? 26-May-20 12:57 PM A bit dark but intentional. It allows a re heat if required 26-May-20 12:57 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-F4C2A.jpg 26-May-20 12:58 PM neat! 26-May-20 12:58 PM Hard glass and tungsten require temperatures approaching bright orange heat. 26-May-20 12:59 PM my oven goes up to 1300 °C 26-May-20 01:00 PM Straw color. This is a good seal but a little thin on the oxide. 26-May-20 01:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-17BE7.jpg 26-May-20 01:00 PM This is the perfect color you are looking for 26-May-20 01:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-BC905.jpg 26-May-20 01:02 PM cool, I'll look out for that 26-May-20 01:02 PM it also just occured to me that my flame might have been a bit reducing 26-May-20 01:02 PM Here is an example where the larger thermal mass of the lead wires pulled out heat where the spud wires did not take as much and the lead wires are darker as they had less diffusion time. 26-May-20 01:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-26DD3.jpg 26-May-20 01:02 PM Pyrex or Duran will want a neutral flame. 7720 will want a slightly reducing flame. 26-May-20 01:05 PM hmm 26-May-20 01:05 PM also, anything to watch out for when it comes to thicker electrodes? 26-May-20 01:05 PM still got a couple 3.2 mm tungsten rods that were a misorder for my welder 26-May-20 01:07 PM Over 1 mm and you really should use an intermediate glass. 7720 or 3320 uranium. 26-May-20 01:07 PM I can send you some 26-May-20 01:07 PM I have more than I will ever need of it 26-May-20 01:07 PM Also if you want some proper welded leads I can send you some of them too 26-May-20 01:07 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-C0392.jpg 26-May-20 01:11 PM I'd be more than happy to get some! 26-May-20 01:11 PM you don't happen to live in the eu, do you? 26-May-20 01:15 PM No but how much can a snail mail envelope be? 26-May-20 01:15 PM DM me your mail address and I will look into it 26-May-20 10:06 PM I am in awe of your superpowers. 28-May-20 05:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200528_103944-C9E4B.jpg 28-May-20 05:23 AM I finally got a real feedthrough 28-May-20 05:23 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200528_141416-90569.jpg 28-May-20 05:59 AM Have you been able to measure neutron yields yet? 28-May-20 06:13 AM the very first runs were ~e4 n/s, but I could not go full 30 kV then and did no baking / conditioning 28-May-20 06:14 AM And that was from bubble dosimeters? Or some other calibrated neutron detector? 28-May-20 06:15 AM it will take some time until I can get this run going, as I still need to build a real holder for the chamber, a new ion source and a lot of shielding 28-May-20 06:15 AM I have one He3 counter that was calibrated to a known AmBe source and I just assumed efficiency was similar for dd neutrons 28-May-20 06:15 AM sure, not ideal, but close enough 28-May-20 06:16 AM How many milliamps will you have at 30 kV? 28-May-20 06:16 AM my hvps does 100 mA, but I didn't go above 20 yet, as I still had a glass window 28-May-20 06:16 AM no window now, so I can just let it burn, maybe actively cool the chamber 28-May-20 06:17 AM Oh wow, a big supply... Might need a cooled grid at full power? 28-May-20 06:18 AM yep that's also one of my worries 28-May-20 06:18 AM we'll see 28-May-20 06:18 AM Best of luck! Hopefully I'll get a decently big supply somehow 28-May-20 06:18 AM They're pricey, and most are of the wrong polarity 28-May-20 06:19 AM the thing is robust af, it's pumped by a drag pump so even if something fails badly and vents to atmosphere there's not much lost 28-May-20 06:19 AM Good luck on your supply hunt! 28-May-20 06:19 AM I paid a pretty penny for mine, but it was well worth it 28-May-20 06:19 AM (sure, 50 or sth kV would be nice, but you can't have everything) 28-May-20 06:21 AM Well I really don't have too much money to spend on it. But I've got a chamber, HV feedthrough and high vacuum pumps ready for a fusor 28-May-20 06:21 AM Probably will hook up the diffusion pump 28-May-20 06:22 AM yeah, a turbo feels like a bit of a waste 28-May-20 06:22 AM both on deuterium as well as just the system in general 28-May-20 06:22 AM the drag does 7 l/s, with the valve on it maybe 5 28-May-20 06:22 AM so Deuterium use will be basically zero XD 28-May-20 06:23 AM Are you getting lecture bottles of D2 from eBay? 28-May-20 06:24 AM you can just order Minicans from linde 28-May-20 06:25 AM 12 stp liters for 80 euros? 28-May-20 06:25 AM That's pretty steep 28-May-20 06:27 AM no idea what the regular price is tbh 28-May-20 06:27 AM I did contact Isowater hoping to get some cheap D2O, and they sent over 15 pages of end use agreement including clauses such as that I promise it won't be used for nuclear explosive development 28-May-20 06:27 AM but it's the easiest way and I really didn't want to start with electrolysis etc 28-May-20 06:27 AM yeah it's dual use so it'll always be fun 28-May-20 06:28 AM https://www.ebay.com/itm/Deuterium-Gas-99-999-pure-99-7-enriched/183919316591 28-May-20 06:28 AM Does not ship to Germany 28-May-20 06:28 AM and I really don't want to have to deal with getting dual use stuff over the boarder 28-May-20 06:33 AM $1 per stp liter is pretty much the standard price 28-May-20 06:34 AM wellp 28-May-20 06:34 AM I got two cans without paying anything, thanks to some friends 28-May-20 06:34 AM that should las me some time 28-May-20 06:34 AM next stel will be trying to get the He3 out of my dead detectors 28-May-20 06:35 AM I'm also looking at prices for xenon and krypton, and oh my are they pricey 28-May-20 06:36 AM oh yes 28-May-20 06:36 AM Not as expensive as high purity D2 (shipping costs a lot) 28-May-20 06:37 AM in minicans Xe is ~80€/sl 28-May-20 06:39 AM You know you'll be paying dear when all major suppliers require you to call for a quote 28-May-20 06:39 AM https://www.ebay.com/itm//312610262440 28-May-20 06:39 AM I still hate myself for giving away my bottle of P10 counting gas 28-May-20 06:39 AM but I did not know any better back then 28-May-20 06:42 AM You can mix that yourself for pretty cheap, and you can play around with the proportions 28-May-20 06:42 AM I know 28-May-20 06:42 AM but it was a 10 l bottle with still like 180 bar left 28-May-20 06:42 AM just would have been nice to have around 28-May-20 06:42 AM atm I'm doing most with straight argon or propane 28-May-20 02:08 PM Xe price also fluctuates a lot 30-May-20 02:13 PM the next turbo is up and running! 30-May-20 02:13 PM turbovac 360 30-May-20 02:13 PM I cannot say how much I hate those pumps 30-May-20 02:13 PM I literally can not, thanks to @Dyno 06-Jun-20 02:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200606_104350-C1E89.jpg 06-Jun-20 02:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200606_105403-BE5CD.jpg 06-Jun-20 02:22 AM Tungsten evap coils! 06-Jun-20 02:22 AM now I can build my aluminium vape 06-Jun-20 03:22 AM Finally you can tell all your friends that you vape, and you'll be "cool" 06-Jun-20 03:23 AM https://giphy.com/gifs/swag-80s-sunglasses-62PP2yEIAZF6g 06-Jun-20 04:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200606_131149-733EF.jpg 06-Jun-20 04:22 AM the two screws represent copper standoffs between which the evap coils will sit the stalk on the left represents a rotary feedthrough as mechanical shutter now I have to make that feedthrough and wait for the copper 06-Jun-20 04:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200606_131921-4E1EA.jpg 06-Jun-20 04:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200606_132004-0FCE1.jpg 06-Jun-20 06:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/JPEG_20200606_151943-949EA.jpg 06-Jun-20 06:21 AM Quick and dirty 488nm raman spectrometer 06-Jun-20 06:24 AM Hey I've seen this before 06-Jun-20 06:24 AM :P 06-Jun-20 06:24 AM Doing any analysis with it or just for fun? 06-Jun-20 06:27 AM just was bored with a friend, we are building a better one with a 532nm DPSS with intracavity etalon 06-Jun-20 06:27 AM this one was build in approx 2h so this has only a resolution of 30cm^-1 06-Jun-20 06:29 AM heh, neat 06-Jun-20 06:31 AM he will use the new one for chemical analysis, in the nect days i will get my Renishaw Raman for my SEM 06-Jun-20 08:08 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-76B7C.png 06-Jun-20 08:08 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-FAC4F.png 06-Jun-20 08:08 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-E95BC.png 06-Jun-20 08:08 AM simple rotary feedthrough, now I have to wait for a shaft seal 06-Jun-20 11:30 AM you're using an actual rotation bearing! 06-Jun-20 11:30 AM we normally just squeeze some o rings and call it a day 06-Jun-20 11:32 AM drastic idea 06-Jun-20 11:34 AM we normally just squeeze some o rings and call it a day @idmb Same for me, usually 06-Jun-20 11:34 AM But I ordered way too many of these bearings for something else and now I gotta use them 06-Jun-20 11:36 AM ah ok 06-Jun-20 08:04 PM Newly assembled 0-1.2kv power supply and a photodiode to de cap and mess around with 06-Jun-20 08:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-3F366.jpg 06-Jun-20 08:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-8FA37.jpg 08-Jun-20 04:16 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200608_123220-70022.jpg 08-Jun-20 04:16 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200608_123702-7D46C.jpg 08-Jun-20 04:16 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200608_130758-CB437.jpg 08-Jun-20 04:23 AM Now I need a shaft seal for the shutter and we're all done! 08-Jun-20 07:13 AM Getting close! Will be evaporating soon. 08-Jun-20 07:15 AM not too son 08-Jun-20 08:31 AM i have some evap boats, tungsten and molybdenum 08-Jun-20 08:31 AM or will you use crucibles? 08-Jun-20 08:37 AM I don't have stuff that exotic that I need a crucible for 08-Jun-20 08:37 AM I can do Al as is, but need boats for Cu and Gd 08-Jun-20 08:37 AM you wanna get rid of some boats? 08-Jun-20 08:37 AM also I could not find crucibles that small, the coils have an ID of ~1 cm 08-Jun-20 08:52 AM oh, interesting 08-Jun-20 08:52 AM apparently you can also use a W basket for copper 08-Jun-20 08:52 AM according to this: https://www.tedpella.com/company_html/Vacuum-Deposition-Techniques-and-Tables.htm 08-Jun-20 08:52 AM I know phosphor bronze wets W, but I wasn't aware that pure Cu works as well 08-Jun-20 09:10 AM Exciting stuff 08-Jun-20 09:20 AM eh good enough 08-Jun-20 09:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-B5333.png 08-Jun-20 09:41 AM yeah I’ve used Cu in W baskets a few times never had an issue 08-Jun-20 09:47 AM awesome, good to know! 08-Jun-20 09:47 AM any ideas on the ratio, eg. how much copper can wet what W surface? 08-Jun-20 10:53 AM I think you dont need any basket, simple evaporator can be just done by wrapping gold wire around the "heater wire" itself :-). 08-Jun-20 10:55 AM but I have baskets 08-Jun-20 10:55 AM like 50 of those 08-Jun-20 10:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200606_105403-0B61D.jpg 08-Jun-20 10:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200606_105529-B52FA.jpg 08-Jun-20 02:08 PM I didn’t delve into wetting/adhesion when I did it, but I’d say put 2 x 1/8” copper pellets in that basket and you’d be fine. 08-Jun-20 03:59 PM Why would wetting be needed? For thermal transfer?? 08-Jun-20 03:59 PM mostly for keeping it in there 08-Jun-20 03:59 PM otherwhise it would just drop out 08-Jun-20 04:37 PM A basket like that will hold copper pellets no issue 08-Jun-20 04:37 PM I’ve never needed to worry about wetting the W basket in practice 08-Jun-20 10:31 PM Oh, so wetting is for baskets , but not needed for boats? 09-Jun-20 01:08 AM Oh, interesting @mike crb 09-Jun-20 01:08 AM then what happens if your material melts? 09-Jun-20 06:18 AM Oh it still wets the basket, but like in the figure you posted; even just at the melting point where you have the highest contact angles, the surface tension will still hold the copper in the basket. 09-Jun-20 06:18 AM most metal-metal systems I imagine would wet a tungsten basket well enough to not drip molten metal out the bottom, if its a small basket 09-Jun-20 06:34 AM oh neat 12-Jun-20 05:29 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200612_141441-D5E8E.jpg 12-Jun-20 05:29 AM big flange 12-Jun-20 05:29 AM now it needs manymany smaller flanges 12-Jun-20 06:00 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200612_145918-3C946.jpg 12-Jun-20 06:34 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200612_150720-6F6CC.jpg 12-Jun-20 06:34 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200612_150732-34107.jpg 12-Jun-20 06:34 AM Looks good. I hope we will see better welds and alignment than this. 12-Jun-20 06:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200612_155830-4913E.jpg 12-Jun-20 07:53 AM Did you do anything to prevent porous welds? 12-Jun-20 08:02 AM cleaned it well 12-Jun-20 08:02 AM but that's it 12-Jun-20 08:03 AM which solvent? 12-Jun-20 08:03 AM Ballistol Bremsenreiniger 12-Jun-20 10:04 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200612_183128-22AE7.jpg 12-Jun-20 10:04 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200612_183143-F5CD9.jpg 12-Jun-20 10:04 AM wow it's bigger than expected 12-Jun-20 10:08 AM 3 clamps scares me a little lol 12-Jun-20 10:20 AM yeah also the fact that it's just standing on the turbo, not screwed onto anything XD 12-Jun-20 11:05 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200612_194744-95FFC.jpg 12-Jun-20 11:05 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200612_200207-259A7.jpg 12-Jun-20 11:05 AM man that's always so satisfying 12-Jun-20 11:43 AM wow that's huge 12-Jun-20 11:45 AM https://www.youtube.com/watch?v=JFlbAn8K5HI 12-Jun-20 01:19 PM oh and also this happened today 12-Jun-20 01:19 PM I got a waver heater for way to cheap 12-Jun-20 01:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200612_153844-B2065.jpg 12-Jun-20 01:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200612_153848-ADFFD.jpg 12-Jun-20 01:19 PM the heater and heat shield are pure tantalum! 12-Jun-20 01:19 PM I'll leave the heater in one piece, maybe build a cup warmer out of it 12-Jun-20 01:19 PM but I can make so many evap boats out of the heat shield 12-Jun-20 01:19 PM almost 400 g Ta in 0.1 mm thick sheet 12-Jun-20 07:53 PM I see sugaring on the outside of your welds. No purge gas back there? 12-Jun-20 07:53 PM Though the part that counts looks good. 12-Jun-20 07:53 PM I’ve got to try what you’re doing with the phosphoric acid. 12-Jun-20 08:15 PM I would love to be able to measure the leak rate of your "dirty" welds vs what our shop does. I'm pretty sure our guys overdo it :/ 12-Jun-20 08:15 PM (at $30/hour) 13-Jun-20 01:08 AM Don't worry I will leak test the whole chamber 13-Jun-20 02:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200613_114206-0D30D.jpg 13-Jun-20 04:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200613_134057-09DF7.jpg 13-Jun-20 05:02 AM I got a waver heater for way to cheap @GigaSquirrel Have fun with it - but keep the possible contermination in mind. Feel free to return the favor if you ever want to get rid of anything I can use. You don't happen to have any ISO-K 400 or PVD magnetron stuff to give away :P? The thermocouple(s) is/are type C (alloy 426 & 405), the feedthroughs can be found here: https://www.ebay.de/itm/ISO-CF-16-DN-Hochvakuum-Durchfuhrung-fur-Temperaturmessung-Thermoelement/153963605027?hash=item23d8f22c23:g:P7oAAOSw2PVe3S85 13-Jun-20 05:03 AM wait, don't tell me I got the heater from you 13-Jun-20 05:03 AM My biggest stuff is iso 250, and that already cost me a pretty penny 13-Jun-20 05:07 AM Yeah - that was mine. A friend (Chris) offered it in the finger-TG-group : ) 13-Jun-20 05:07 AM Yeah that's where I got it from 13-Jun-20 05:07 AM man the world is tiny 13-Jun-20 05:07 AM you say possible contamination, what did you use this thing with? 13-Jun-20 05:07 AM I checked it for radiological contamination, but I can hardly do anything else 13-Jun-20 05:09 AM i got it myself only via a few detours and it was not possible to tell me exactly which substances came into contact with it. i only know that it comes from an MBE system. 13-Jun-20 05:11 AM oh, interesting 13-Jun-20 05:11 AM so arsenic would be worst case 13-Jun-20 05:11 AM but it's well embedded in there 13-Jun-20 06:12 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200613_151155-A4891.jpg 13-Jun-20 03:21 PM A friend's new toy: 13-Jun-20 03:21 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200613_1719412-6B87C.jpg 13-Jun-20 03:22 PM ohh, cool! 13-Jun-20 03:39 PM nice! what components? 13-Jun-20 10:41 PM It’s a cryocooler. 13-Jun-20 10:41 PM We are hoping to use it to make our own LN2 plant. 13-Jun-20 10:41 PM Also looking into the possibility of using it to cool a HPGe without LN2. 13-Jun-20 10:41 PM These things vibrate quite a bit. 14-Jun-20 12:32 AM for the pulsed power folks: I retail therapy'd a slightly used but very pretty R.E Beverly trigatron https://twitter.com/profanegeometry/status/1272004230815952896?s=19 14-Jun-20 01:22 AM Ahh, so cool! 14-Jun-20 01:22 AM also, apparently not a regular spark Plug? 14-Jun-20 01:22 AM does it have to be pressurized? 14-Jun-20 05:12 AM I rewound the transformer for my evap setup 14-Jun-20 05:12 AM and man that was worth it 14-Jun-20 05:12 AM I think I set my tantalum on fire 14-Jun-20 09:14 AM Ouch! 14-Jun-20 09:14 AM I thought the lifetime of those filaments depends on the pressure you're running them at 14-Jun-20 09:47 AM yep 14-Jun-20 09:47 AM that was just a test in air to see if its enough current 14-Jun-20 09:57 AM @rdpierce do you know the models? i've been looking at various cryopumps/heads, curious what people are using 14-Jun-20 09:58 AM Apparently these sell in excess of $20k 14-Jun-20 09:58 AM They are heavily scavenged from Telco equipment on eBay. 14-Jun-20 09:58 AM The only reason we got that one was because it was custom made for a pharma customer application. 14-Jun-20 10:00 AM but thanks to a few big youtubers they got so expensive you can't really pay them anymore 14-Jun-20 10:00 AM So the manufacturer had it on a shelf and couldn't sell it otherwise 14-Jun-20 10:00 AM We are running it at partial power because we want to add better cooling to the heat sink. We're not sure if it will liquify air or not. 14-Jun-20 10:01 AM yeah, been trying to get my hands on the Supercondcutor base stations to pull one out 14-Jun-20 10:01 AM Good luck, they're unobtainium. 14-Jun-20 10:02 AM i see them on ebay every once in a while, just a little more than i'd like to spend 14-Jun-20 10:02 AM Of course we don't want to liquify air.... 14-Jun-20 10:02 AM Sorry, unobtainium at most hobbyists' budgets. 14-Jun-20 10:02 AM They also vibrate like crazy. It's awful. 14-Jun-20 10:02 AM I'm not sure we could use it for HPGe now that I think about it due to microphonics. 14-Jun-20 10:05 AM they should not vibrate (much) 14-Jun-20 10:05 AM either the counterweight is missing or too much amplitude or wrong frequency 14-Jun-20 10:05 AM the counterweight on top looks like it should be screwed into something on the outside, acting as a spring 14-Jun-20 10:05 AM hmm or not 14-Jun-20 10:10 AM If you grab that thing with your hand, the unit tries to shake the planet apart 14-Jun-20 10:10 AM It is damping vibration. 14-Jun-20 10:10 AM But the floor still shakes, and it sets up standing waves across the room. 14-Jun-20 10:10 AM so maybe wrong frequency? 14-Jun-20 10:10 AM does it say anything about that? 14-Jun-20 10:31 AM Our brand new sumitomo cold heads also vibrate a ton. Compressor too. 14-Jun-20 10:32 AM huh. 14-Jun-20 05:36 PM @rdpierce Is that a stirling cryocooler? 14-Jun-20 07:59 PM I’m not sure if it’s Stirling, but it’s definitely a cryocooler. 14-Jun-20 08:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200615_052153-D9DA3.jpg 14-Jun-20 08:28 PM Added a piezo focus to my microscope setup, still a prototype obviously but works really well 14-Jun-20 08:28 PM https://home.strw.leidenuniv.nl/~pbosch/focus.mov layers on this chip are ~1um 14-Jun-20 09:12 PM lol ETA 1 hour to download 14-Jun-20 09:12 PM perhaps use avidemux and recompress as h264? 15-Jun-20 04:19 AM Could do that 15-Jun-20 04:19 AM Firefox seemed happy to stream it 15-Jun-20 09:05 AM just chrome I guess 15-Jun-20 09:05 AM in the future though, avidemux runs really quick for simple transcodes 15-Jun-20 11:00 AM I'll try, reason for not transcoding was twitters codec messing it up completely 16-Jun-20 11:41 PM When you need LN2 pump and none is around? Design it and 3D print it! https://www.youtube.com/watch?v=IAB2zf_LNVM 16-Jun-20 11:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/result_v2-A403D.jpg 17-Jun-20 04:51 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200617_134546-00463.jpg 17-Jun-20 04:51 AM @bkralik cool pump, looks (and sounds) like a centrifugal design? 17-Jun-20 05:37 AM @GigaSquirrel Yes, just really simple centrifugal pump - I like KISS approach :-). Sound is mainly caused by crappy chinese bearing not being happy at 77 K. Hopefully better bearing (degreased with acetone and lubircated by graphite powder) will make it smoother... 17-Jun-20 05:41 AM cool! 17-Jun-20 05:41 AM I'm a bit surprised the plastic is holding up, is it just PLA? 17-Jun-20 05:51 AM PETG, printed on standard Prusa. However I think even PLA would be OK... 18-Jun-20 01:04 PM @GigaSquirrel ooh, modular feedthroughs? 18-Jun-20 01:04 PM well, weld / solder in 18-Jun-20 01:08 PM oic! cute kit 18-Jun-20 01:09 PM ohh yes 18-Jun-20 01:09 PM and now I will never use them because I will always have the thought that I can use them for sth better in the future in the Back of my head 18-Jun-20 01:52 PM Don’t be like us 18-Jun-20 01:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-D98BD.jpg 18-Jun-20 02:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-A7D9E.jpg 18-Jun-20 02:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-B0B7B.jpg 18-Jun-20 02:17 PM So long 18-Jun-20 02:30 PM Nice one. 18-Jun-20 02:30 PM On work I found a KF flange. 18-Jun-20 02:30 PM But not the normal type. It was more like ISO-KF 100/150. 18-Jun-20 06:57 PM Does anybody in the California/Nevada area have any need for pyrex/Duran tubing? I am basically being forced to take quite a bit more than I will need. Various diameters up to I think 41 mm and maybe even some larger. Like a pallets worth of boxes. Also quite a bit of schott AR glass in various sizes as well. Let me know. 19-Jun-20 02:28 PM How to mount a pulsed valve in high vacuum when you’re not allowed to mount anything to the walls or flanges... 19-Jun-20 02:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-FAF8E.jpg 19-Jun-20 03:07 PM nice! 19-Jun-20 03:07 PM @Charles what is pyrex tubing typically for, vacuum/chemical glass apparatuses? 19-Jun-20 03:29 PM Yes 19-Jun-20 04:31 PM Equivalent to Duran. 33 glass 20-Jun-20 05:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_8352-A222A.jpg 20-Jun-20 05:59 PM Just picked up the last remnants of RCH labs from my friend. Lots of 40MM AR Glass and quite a bit of pyrex in larger sizes. Also a bunch of KF fittings and a turbo and controller. When I get home later tonight I will try to do a look through but a lot of this stuff is just way too much for me to ever ise in my lifetime. 20-Jun-20 05:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_8355-FC79C.jpg 20-Jun-20 05:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_8354-977D3.jpg 21-Jun-20 02:21 AM Wow! 21-Jun-20 02:21 AM Really nice catch! 23-Jun-20 03:10 AM speaking of glass 23-Jun-20 03:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200623_115417-25EB5.jpg 23-Jun-20 03:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200623_115835-2233F.jpg 23-Jun-20 03:10 AM got my first piece of quartz today 23-Jun-20 03:10 AM it's weird heating anything up to that temperature and seeing that it doesn't change at all 23-Jun-20 05:19 PM Yeah. White hot and just barley soft 23-Jun-20 09:13 PM What type of torch? 24-Jun-20 12:44 AM oxy propane 24-Jun-20 06:57 AM Fun. 24-Jun-20 06:57 AM I acquired an oxyacetylene rig recently. I haven’t used it yet because I need to get larger tanks. I got it before considering the CFH rating on my brazing torch tip and realizing I couldn’t safely use it due to the 1/7 rule. (But by larger, I just mean upgrading from an MC to a B.) 26-Jun-20 05:42 AM https://youtu.be/ur0siqJzOKs 26-Jun-20 05:42 AM please excuse the crappy autofocus ^-^ 26-Jun-20 10:39 AM A couple years of shielding accumulation from researchers deciding “Maybe P-32 work isn’t worth the pain.” 26-Jun-20 10:39 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-CD8DD.jpg 26-Jun-20 10:40 AM Oh wow 26-Jun-20 10:40 AM That one on the upper right looks heavier than just 32P 26-Jun-20 10:41 AM they'd be great as showcases for collectors 26-Jun-20 10:49 AM Assuming there isn't any contamination you could easily offload most of the box style ones with hinged lids very little trouble by selling them to people with exotic pets (display enclosures)... 26-Jun-20 10:49 AM Those look very well made 26-Jun-20 10:52 AM This is really the EH&S “PLEASE DON’T BUY ANY MORE. WE’LL GIVE IT TO YOU FOR FREE.” showroom for researchers. 26-Jun-20 11:09 AM I'd love to grab a pallet 26-Jun-20 11:20 AM You have this irritating ocean and most of two continents in the way. 26-Jun-20 11:24 AM which is a good thing in this case, as I want a pallet, but definitely do no need it 26-Jun-20 01:13 PM Heh 26-Jun-20 01:13 PM Nothing like buying a pallet of crap for 35eur at a surplus auction. 26-Jun-20 01:14 PM you know it 26-Jun-20 01:14 PM I've done it. 26-Jun-20 01:15 PM hehe 26-Jun-20 06:31 PM This just arrived in the mail 26-Jun-20 06:31 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-A5267.jpg 26-Jun-20 07:03 PM If those just had P-32 in them, then they are probably benign by now and ready to receive any collectibles one would wish to keep in them. So tempting as I am In Fresno, but I am currently trying to dump stuff myself preparing to list my house when I am done building the new one. 26-Jun-20 07:03 PM P-32 is down in the background noise by what, 100 days? 27-Jun-20 01:23 AM very cool pic! 27-Jun-20 01:23 AM P-32 is down in the background noise by what, 100 days? @Charles depends on initial Activity 27-Jun-20 06:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200627_150516-7661E.jpg 27-Jun-20 06:21 AM woo, more quartz! 27-Jun-20 06:29 AM @Addison-110m I’m so glad to see it went to a good home. 27-Jun-20 10:34 AM I have some quartz furnace boats coming today. I am going to try a very dangerous thing actually. Totally goggles and a respirator affair. Going to attempt to make batalum alloy. 27-Jun-20 10:44 AM what alloy? 27-Jun-20 10:58 AM oh, some getter thingie 27-Jun-20 11:24 AM Yeah 27-Jun-20 02:21 PM First attempt was not successful. I believe the barium reacted with gasses trapped in the aluminum. In reading some old literature I see now that they melted the aluminum in the traditional open crucible manner. I am guessing they degased the aluminum then added the barium to the melted aluminum to protect it from atmospheric gasses until it had a chance to alloy. 27-Jun-20 02:21 PM Then probably removed the oxides from the barium as slag. 28-Jun-20 06:01 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200628_143818-63F43.jpg 28-Jun-20 06:01 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200628_143928-3936D.jpg 28-Jun-20 06:01 AM kf adapter for the big tube 28-Jun-20 06:01 AM only missing the bottom part for compression 28-Jun-20 06:42 AM Oooh pretty. The tube can withstand atmospheric pressure with a vacuum applied? 28-Jun-20 06:44 AM it should 28-Jun-20 08:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200628_171858-62CC7.jpg 28-Jun-20 08:20 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200628_171919-D7647.jpg 28-Jun-20 08:29 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-56079.png 28-Jun-20 08:29 AM looks like it's holding 28-Jun-20 09:17 AM nice blast shield 28-Jun-20 09:18 AM yeah I really don't want any glass shrapnell here 28-Jun-20 05:47 PM Minimum thickness for under 2” cylindrical glass at atmospheric pressure is only .010” thick. Generally light bulbs are about .015 thick minimum. That tubing should have absolutely no problem. 28-Jun-20 05:47 PM Guards however are good for the ape like creatures (us) who accidentally break things. 28-Jun-20 05:47 PM Oh. Attempt 2 at making BaAl4 alloy failed as well. Was using a torch for heat. Not consistent enough. Also molten pool was not deep enough to get the barium submerged before reaction with air took place. 05-Jul-20 05:36 AM I hate this 05-Jul-20 05:36 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/EcKXUBrXgAIE56Q-727C4.png 05-Jul-20 09:16 AM Does it not fit? 05-Jul-20 09:16 AM Looks like if you clamped it it would fit 05-Jul-20 09:43 AM Hmm. "Kontaminiert"... 05-Jul-20 10:15 AM it does not fit 05-Jul-20 10:15 AM and if I clamp it it would break off the exhause filter 05-Jul-20 10:19 AM I think connecting the exhaut filter over a right-angle piece could help 05-Jul-20 11:22 AM Have you tried to quantify the contamination? 05-Jul-20 11:22 AM That sticker looks... Ominous.... 05-Jul-20 12:41 PM Ummmmmm.... not gonna lie I would be just a touch worried bout that too. It could totally be nothing and just be contaminated from the standpoint of what they were doing with it and perfectly useable for your needs, or..... yeah could be nasty stuff you don’t want. 05-Jul-20 12:42 PM don't worry, I put that sticker on there ^^ 05-Jul-20 12:42 PM technically it has pumped tritium before 05-Jul-20 12:42 PM even if it was just a few ~10^8 atoms 05-Jul-20 12:46 PM Ok. Meh then. Well you might have to do some concoction of fittings but since it’s gonna be on the outlet then no big deal. 05-Jul-20 08:41 PM Shoot, even if you were just using tritium in the same room it will happily concentrate in the pump oil. Very, very annoying from the decon POV. 06-Jul-20 01:23 AM hehe, yep 06-Jul-20 01:23 AM I once did decon at a cyclotron facility that used a tritium beam 06-Jul-20 01:23 AM and getter pumps in the vacuum system 06-Jul-20 01:23 AM here we've got a legal limit on the activity of nuclear waste per barrel 06-Jul-20 01:23 AM ...I have no idea what their solution was in the end 06-Jul-20 10:26 AM The usual answer? Tag those pumps as Internally Contaminated - Rad Area Use Only and then sample them on a regular basis as canaries in the coal mine for what you've lost control of but didn't notice. And then use them for as long as possible before throwing them away as bulk rad waste. And that's today's "Tricks of the Trade" from Phil! 07-Jul-20 10:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-92A67.jpg 07-Jul-20 10:38 AM weird to be actually able to see our RGA now 07-Jul-20 10:42 AM neat! 07-Jul-20 02:30 PM Cool! 08-Jul-20 07:11 AM Neat picture. You know I have always thought this vacuum stuff might have a side business as visual effects for movies. 2009 Star Trek used the Livermore lab fusion ignition labs as the set for the warp core and it looked totally believable 08-Jul-20 07:11 AM Correction... not 2009. It was into darkness. As you were. Hahaha 08-Jul-20 11:30 AM That was a fun time at Livermore. I'm informed things were much better controlled that it was during the TRON filming. 08-Jul-20 02:34 PM New alpha spectrometer board arrived 08-Jul-20 02:34 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_0845-F2A41.jpg 08-Jul-20 02:42 PM yay! 09-Jul-20 07:00 AM Sweet 10-Jul-20 07:39 AM nice! sharing a schematic? 10-Jul-20 07:45 AM https://discordapp.com/channels/513115950501855256/597334400618725385/710505215941541888 10-Jul-20 10:48 AM PMT cable too short for the rackmount supply to go in my rack, had to improvise 10-Jul-20 10:48 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-F75FC.jpg 10-Jul-20 11:43 AM hope the EMI pickup (if any) isn't too bad next to that mcp preamp 10-Jul-20 11:45 AM that's actually a high voltage gate 10-Jul-20 11:45 AM we don't read off the MCP, there's a phosphor screen + camera + PMT 10-Jul-20 11:45 AM On the other system the wires all ended up individually wrapped in aluminum foil, and that worked 10-Jul-20 11:52 AM ooh gotcha 10-Jul-20 11:55 AM the gate is so we can do mass-selective imaging with the ToF without overloading the MCP 11-Jul-20 04:36 PM Getting ready to clean and assemble. My game plan is once-over with acetone then isopropyl. Lint free cloths, brushes all with gloves on. It’s a bit of a stab in the dark, would love to hear others’ techniques. Noting I don’t have an ultrasonic bath. Throw spears and ideas 11-Jul-20 04:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-AD732.jpg 11-Jul-20 05:07 PM Target pressure? Pump? Gas load? 11-Jul-20 05:07 PM For dirty stuff, I cleaned with boiling water and soap, rinsed thoroughly, then isopropanol. Baked for a while out of vacuum with heat gun, unsure if that helps at all but it dries it quick. Used Kim wipes with nitrile gloves of course. With a turbo above 1E-7 is trivial, even just water would work. 11-Jul-20 06:26 PM acetone + iso does work well for hydrocarbony residues, though i keep the former well away from any elastomer seals. blowing dry/canned (without bitterant!!) air works well for getting kimwipe lint off of stuff that really needs it (viewports, e.g.), but, yeah, that all should work fine 11-Jul-20 06:32 PM I would recommend a bulb blower for getting rid of lint. This is probably just me being paranoid, but I'd much rather just blow air to clean anything sensitive over fluoroethanes. 11-Jul-20 06:38 PM fair 11-Jul-20 09:14 PM Thanks all! Hoping to get to 1E-8, you can see the TMH260 pump sitting on the side there. I actually think my roughing pump might be the limfac... It’s a ducks for cover Chinese dual vane hvac. I’ve got a decent MDC filter for the roughing line though... ‍♂️ 12-Jul-20 01:42 AM We usually clean our SS stuff with sodium hydroxide solution, then thorough rinse in demineralised water (it's not that hard to have small demi-station at home), then thorough rinse in IPA. Sodium hydroxide is really effective against hydrocarbons because it "reacts" with them, not only dissolves them as IPA/Acetone... 12-Jul-20 08:00 AM What concentration sodium hydroxide do you use? 12-Jul-20 08:02 AM Honestly so long as you wipe the dust away I think you’ll hit 1E-8 within a week, no other work needed. 12-Jul-20 10:51 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-0D475.jpg 12-Jul-20 10:51 AM If you don’t come out of this quarantine with a set of 3D printed bagpipes, you didn’t ever lack the time, you lacked the discipline. These are the stocks (chanter, two tenor drones, bass drone, blow stick) that fit into the bag. The prints took forever at 100% infill, PLA, with 0.14 mm layers. 12-Jul-20 11:02 AM I can hear them now. When I was a kid every year our Boy Scout troop would direct the parking and sell programs to the local Highland games. It would take a week to get the bagpipes out of my head! 12-Jul-20 11:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200613_172511-4D098.jpg 12-Jul-20 11:13 AM So my friend found an Easy Bake Oven at a garage sale. It's got a control for cooking time, and another one for kV, not sure what that is, maybe it's like temperature? 12-Jul-20 11:14 AM That didn’t actually come from a yard sale did it 12-Jul-20 11:15 AM No.... In all seriousness, he has a non-profit and has proper registration for the x-ray gear he has, and this will be registered with the IL EPA. 12-Jul-20 11:15 AM set it to 2 kV and put a magnetron in there 12-Jul-20 11:15 AM Darn, wanted to know what sorta yard sales I should be looking for 12-Jul-20 11:15 AM Because last I checked Virginia has a kinda wild exemption for home use for X-ray machines 12-Jul-20 11:18 AM He tried hacking together a digital imaging setup. The item would sit on top of an image intensifier screen. In the bottom, he has a Raspberry Pi camera, with a sheet of lead glass to attempt to protect it from rad damage. 12-Jul-20 11:18 AM Oh interesting 12-Jul-20 11:19 AM Results were pretty bad considering this is supposedly a microfocus source designed for high res imaging. 12-Jul-20 11:19 AM I think it's more a problem of the optical setup. Supposedly he acquired chemistry, film, and a film processor, and he's able to see the bond wires inside ICs. 12-Jul-20 11:19 AM He also has a second 100 kV cabinet, but that's at a different location and I haven't seen it yet. I believe he intends to use this for reverse engineering electronics. 12-Jul-20 11:19 AM If there was a way to get a decent resolution digital sensor inside this, he'd like to make a rotating stage and do CT. 12-Jul-20 11:25 AM Can he simply use a mirror to put the camera out of direct line of sight of the x-rays? Is it okay to put a small hole in the door for the imager to look at a mirror angled at 45 degrees? 12-Jul-20 11:25 AM Film is hard to beat in terms of resolution though, and you need a proper DR panel (pixel resolution on the order of hundreds of microns) to do actual CT of tiny stuff 12-Jul-20 11:27 AM Ehhh.... He is trying to be legit. That means a state inspector will need to examine this, and it would be hard to explain that kind of hacking. 12-Jul-20 11:27 AM The state inspector already came out to inspect his pXRF. 12-Jul-20 11:28 AM I'd just buy some automatic film processing machine then 12-Jul-20 11:28 AM He has one. 12-Jul-20 11:29 AM Then it should be really fast to go through a stack of films and digitize those to make really, really good CT scans 12-Jul-20 11:30 AM Wasn’t there a design for something similar in that paper @GigaSquirrel pulled a preamplifier design out of? 12-Jul-20 11:30 AM He can also track down the Hamamatsu DR panel that were inside some models of these faxitron machines 12-Jul-20 11:30 AM the stuff I got my preamp from just moved a single diode around 12-Jul-20 11:30 AM Probably need to pay like $1500+, if he's lucky 12-Jul-20 11:30 AM https://nucwiki.org/wiki/index.php/Faxitron 12-Jul-20 11:30 AM Unfortunately they are made for really low x-ray voltages, only up to 35 kVp, because they are meant for biopsies 12-Jul-20 11:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/xc_13062020_2343-49--1-1ED05.png 12-Jul-20 11:33 AM This is with the pi camera? 12-Jul-20 11:33 AM Hacked digital imaging of my Saturn V LVDC board. 12-Jul-20 11:33 AM Yes, Pi camera. Using a Medlink green ISO 400 screen. 12-Jul-20 11:33 AM They come in pairs to expose both sides of the film. We just used one of them. 12-Jul-20 11:35 AM What's the exposure time, tube voltage and current? 12-Jul-20 11:35 AM 50 kV. Current cannot be set. This runs continuously. He is trying to do a long exposure wth high gain on the Pi camera. 12-Jul-20 11:35 AM He got good results with film, so I think the tube focus is fine. I think this may have something to do with photographing the image intensifier screen, instead of using it with film like it was intended. 12-Jul-20 11:35 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_0568-EB704.jpg 12-Jul-20 11:35 AM That's the item being imaged. 12-Jul-20 11:35 AM This board is covered in conformal coating, so I can’t buzz it with a multimeter easily. 12-Jul-20 11:35 AM Of course it’s dual sided so it’s going to be difficult separating out the layers. 12-Jul-20 11:43 AM Hmm, I'd love to see an image of that taken with film 12-Jul-20 11:43 AM And higher voltage, if possible 12-Jul-20 11:44 AM He has a 100 kV unit. 12-Jul-20 11:45 AM https://www.ebay.com/itm/CROSSHAIR-WIRE-FINE-TUNGSTEN-WIRE-FOR-SCOPES-AND-TRANSITS-0125mm-0005/324155185878?hash=item4b79279ad6:g:v-wAAMXQ2UVQ9N2j 12-Jul-20 11:45 AM These super thin tungsten wires would be great for an image quality indicator (IQI) 12-Jul-20 11:45 AM Wires this thin is certainly a bit ambitious for a faxitron, but one can dream 12-Jul-20 11:45 AM But thicker stuff do exist of course 12-Jul-20 11:47 AM What’s the size of typical IC bond wires? 12-Jul-20 11:47 AM He says he can see those. 12-Jul-20 11:48 AM I think there's a large variation, from tens to hundreds of microns 12-Jul-20 11:48 AM Depending on designed current load...etc. 12-Jul-20 11:48 AM But a dedicated IQI will allow you to remove effects from scattering...etc. and assess which is the limiting factor for resolution in the system 12-Jul-20 01:08 PM I am curious if anyone has manuals for this unit. MicroFocus Imaging, MICRO 50. 12-Jul-20 01:38 PM @rdpierce I've seen the McCallum factory in Scotland! Their CNC setup is impressive. 12-Jul-20 02:20 PM Oh cool! I have a McCallum practice chanter, and am probably going to buy a McCallum chanter for these pipes. 12-Jul-20 02:20 PM (The chanter is too finicky to attempt to 3D print, at least in FDM. Also, chanters have conical bores. The bores in the drones are cylindrical, which means I can use a reamer to get them to exact dimensions and smooth. That’s not an easy option for a conical bore.) 15-Jul-20 08:15 AM Ohh I got a bit of RF gear today 15-Jul-20 08:15 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200715_153959-E127E.jpg 15-Jul-20 08:15 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200715_154706-81EEE.jpg 15-Jul-20 08:15 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200715_163739-AAB1F.jpg 15-Jul-20 08:15 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200715_164202-51CE3.jpg 15-Jul-20 09:38 AM now that I look at it it looks more like ccp not icp 15-Jul-20 11:18 AM Nice 15-Jul-20 11:18 AM But it is actually icp, right? 15-Jul-20 11:18 AM I really need to get off mu butt and weld up a chamber to hook my rf generator and tuner to 15-Jul-20 11:33 AM icp or ccp, the fact that it goes to the grounded side of the chamber suggests to me that it's ccp, just shortened the coil down to 2 windings that should definitely get it to icp 15-Jul-20 11:42 AM aaaand I can't match that 15-Jul-20 12:22 PM I've seen some weird coil geometry for ICP. 15-Jul-20 12:22 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200715_142538-52959.jpg 15-Jul-20 12:22 PM Two independent coils. 15-Jul-20 12:29 PM I'm sure there's some extra weird stuff you can do for icp 15-Jul-20 04:32 PM Well this is the last place I expected to see a heathkit anything though I guess I should have known better 15-Jul-20 06:53 PM This watch is ridiculous and dumb and I love it. 15-Jul-20 06:53 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-346D7.jpg 15-Jul-20 07:29 PM Radiation, Chemical, and Biological Defense Troops of the USSR? 15-Jul-20 08:57 PM @GigaSquirrel what do you mean goes to ground, I thought the coil does all the work 16-Jul-20 12:56 AM @GigaSquirrel what do you mean goes to ground, I thought the coil does all the work @nmz787 That the plasma is not just near the coil, but between the coil and the grounded metal parts of the "chamber" 16-Jul-20 12:56 AM I see that, figured you had some bias drawing it out 16-Jul-20 12:56 AM But like, if the RF gen is only hooked to the coil.... I'm not getting the circuit topology 16-Jul-20 12:57 AM generator => amplifier => matcher => coil 16-Jul-20 12:57 AM and the matcher should take out all DC bias 16-Jul-20 12:58 AM Ok, so where's the body connection coming into this? 16-Jul-20 12:58 AM If you just have all the chassis's connected then that seems bad news 16-Jul-20 12:58 AM Something is leaking major would be my guess 16-Jul-20 01:00 AM the rf stuff is all single ended coax with a grounded shield, the metal vacuum parts are grounded 16-Jul-20 01:00 AM maybe I should use the coil balanced 16-Jul-20 01:00 AM that would technically be the right way, but yesterday was really just playing around 16-Jul-20 07:47 AM yep, that definitely was not ICP yesterday 16-Jul-20 07:47 AM got that today 16-Jul-20 07:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/S2350001-9268F.JPG 16-Jul-20 07:47 AM gets pretty bright 16-Jul-20 07:47 AM and has a lot of UV 16-Jul-20 07:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/S2350006-200DA.JPG 16-Jul-20 07:47 AM https://www.youtube.com/watch?v=x0dnrWm4og8 16-Jul-20 07:53 AM What frequency is that running at? 16-Jul-20 07:54 AM 13.56 MHz 16-Jul-20 07:54 AM it's surprising how little RF this radiates off, my scope is a meter or so away and I can't see it at all 16-Jul-20 07:58 AM Yeah I’m kinda surprised too given I’ve loaded up weird things and had them radiate pretty well (like that bucket) 16-Jul-20 07:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-94015.jpg 16-Jul-20 07:58 AM Then again balanced vs unbalanced connnection I guess 16-Jul-20 07:59 AM and I'm very sure that this is close to the worst antenna I could design 16-Jul-20 07:59 AM at the best matching I can achieve the VSWR is still > 3 16-Jul-20 08:00 AM Yikes 16-Jul-20 08:02 AM MISMATCH TOLERANCE: 100% of rated power without foldback. Will operate without damage or oscillation with any magnitude and phase of source and load impedance. 16-Jul-20 08:02 AM goddamn it I love this amplifier 16-Jul-20 08:02 AM Damn 16-Jul-20 08:02 AM That’s impressive 16-Jul-20 08:03 AM http://www.testequipmenthq.com/datasheets/AMPLIFIER%20RESEARCH-75A250-Datasheet.pdf 16-Jul-20 08:05 AM Makes me wonder what the finals are actually rated for. Probably a lot more than 100W 16-Jul-20 08:05 AM finals? 16-Jul-20 08:06 AM Final amplifier transistors 16-Jul-20 08:06 AM ah 16-Jul-20 08:06 AM same, but I'm not too keen on opening it tbh 16-Jul-20 08:06 AM Yeah, if it works I don’t see why you’d want to 16-Jul-20 08:07 AM curiosity 16-Jul-20 08:07 AM True 16-Jul-20 08:07 AM Though glancing at the data sheet it does specify a maximum of 2:1 VSWR on the output 16-Jul-20 08:11 AM I interpreted that as: if the load is a perfect 50 ohm resistive vswr will be 2:1 at worst 16-Jul-20 08:11 AM but I don't have a 50 ohm load or vswr bridge to test 16-Jul-20 09:34 AM Yeah I read it as that’s the maximum you should put on it but I’m not certain either 16-Jul-20 10:14 AM I mean it survived worse 16-Jul-20 10:15 AM Yeah, and running at reduced power will certainly be good for that 16-Jul-20 01:24 PM No spring no problem? 16-Jul-20 01:24 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-25983.jpg 16-Jul-20 01:30 PM Rubber for extra safety 18-Jul-20 03:21 AM A bit of (bio?) chemistry to mix things up 18-Jul-20 03:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-10297.png 18-Jul-20 03:21 AM I'll be gone for two weeks and don't want the cucumbers from my garden to go bad, so I pickeled them! 21-Jul-20 01:58 PM I’ve discovered I don’t understand shielding 21-Jul-20 01:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-22D66.jpg 21-Jul-20 01:58 PM But this works great 22-Jul-20 03:00 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_112536-88E4F.jpg 22-Jul-20 03:00 AM funny methane 22-Jul-20 03:00 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_115310-C0367.jpg 22-Jul-20 03:00 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_115325-38B6C.jpg 22-Jul-20 03:00 AM magnet 22-Jul-20 03:00 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_115516-7684D.jpg 22-Jul-20 03:00 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_115524-83781.jpg 22-Jul-20 03:00 AM vacuum \o/ 22-Jul-20 05:29 AM NMR? 22-Jul-20 05:36 AM fticrms 22-Jul-20 05:36 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_133816-4C7E6.jpg 22-Jul-20 05:36 AM cold, cheap 22-Jul-20 05:36 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_143128-86895.jpg 22-Jul-20 05:36 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_143135-07CC8.jpg 22-Jul-20 05:36 AM cold, not cheap 22-Jul-20 05:57 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_145204-674CE.jpg 22-Jul-20 05:57 AM this cursed high vacuum to air vent Adapter 22-Jul-20 07:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_152927-73232.jpg 22-Jul-20 07:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_153002-3E4F7.jpg 22-Jul-20 07:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200722_153013-2E03C.jpg 22-Jul-20 07:10 AM ln2 filling adapter with integrated cooling for the User 22-Jul-20 07:10 AM I have no idea what the guy building this was thinking... 22-Jul-20 07:32 AM Is that a glass or plastic volumetric bottle in that kludge? 22-Jul-20 07:41 AM yes, plastic 22-Jul-20 07:41 AM the ln2 sprays out both sides 22-Jul-20 07:41 AM why? 22-Jul-20 07:41 AM I don't know 22-Jul-20 08:18 AM Is that an fticrms? 22-Jul-20 08:18 AM Oh, I should read down 22-Jul-20 08:18 AM What a cool instrument regardless 22-Jul-20 08:37 AM it is 22-Jul-20 08:37 AM and yes, very cool 22-Jul-20 08:37 AM liquid helium cool 22-Jul-20 08:37 AM tomorrow they'll swap the cold head and refill LHe 22-Jul-20 10:40 AM was nice of them to let you snap some photos 22-Jul-20 11:01 AM well I'm (a bit more than) friends with the dude running the experiments on there, sooo... ^^ 22-Jul-20 11:01 AM I hope the Bruker maintenance guy doesn't stop me from taking Pics 22-Jul-20 01:30 PM I doubt he will. Those are commercial and pretty standard nowadays. Plus AFAIK most of the real secret sauce tech is patented so you couldn't make a competitor without paying Bruker anyway. Though it wouldn't be the first time I've underestimated the greediness of instrument manufacturers. 23-Jul-20 05:32 AM I like this lab 23-Jul-20 05:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200723_142914-9928B.jpg 23-Jul-20 05:32 AM where e-8 mbar is considered bad 23-Jul-20 07:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200723_154149-1B528.jpg 23-Jul-20 07:06 AM cool stuff 23-Jul-20 07:30 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200723_162954-26B32.jpg 23-Jul-20 07:48 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200723_164623_493-8FCB6.jpg 23-Jul-20 12:58 PM https://twitter.com/GigaBecquerel/status/1286388174906961923?s=19 23-Jul-20 05:03 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-2E048.jpg 23-Jul-20 05:03 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-8BCE9.jpg 23-Jul-20 05:03 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-56A0F.jpg 23-Jul-20 05:03 PM huge chunks of free-floating acrylic + messy wires + a terminal block = good for 1E-8 right? 23-Jul-20 05:38 PM what could go wrong? 23-Jul-20 05:38 PM lol 23-Jul-20 05:56 PM Probably yeah tbh 24-Jul-20 11:31 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200724_132659-5AEAF.jpg 24-Jul-20 11:31 AM My new friend. From Russia with love. 24-Jul-20 11:37 AM the working principle of these things will always be an enigma to me 24-Jul-20 11:41 AM Sorry if I'm being overly cryptic here. 24-Jul-20 11:58 AM I like Turing stuff, I have this tea towel up on my wall: https://www.fitzwilliammuseumshop.co.uk/product/alan-turings-zeta-function-machine-tea-towel/ 24-Jul-20 01:29 PM Turing’s methods of breaking Enigma wouldn’t stand a chance against Fialka. 24-Jul-20 01:29 PM 10 electrical rotors, each stepping in alternate directions. 24-Jul-20 01:29 PM The stepping is highly irregular. 24-Jul-20 01:29 PM The “steckerboard” is not reciprocal. So if A on the keyboard / lamps maps to B on the rotors, B doesn’t have to map to A. 24-Jul-20 01:29 PM The later wheels had interchangeable cores. So 10 rotors, 10 cores that can be swapped between then, and flipped in one of two orientations, and rotated in one of 30 orientations. 24-Jul-20 01:29 PM And the reflector used one output to cause the input to pass unencrypted to the output. So a letter can encrypt to itself, meaning that there’s no way to rule out mismatched cribs. 25-Jul-20 06:34 AM Well, I’m making a lot of progress with the Fialka. The electronics and the tape punch seem very happy. I was able to un-stick the print head. (The units supposedly got an individual hammer blow to the print mechanism. It broke off one of the print head lifter arms, but the other seems fine.) 25-Jul-20 05:37 PM The LEDs strobe at a rate that my camera scans 25-Jul-20 05:37 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/video0-22782.mov 25-Jul-20 05:51 PM anyways 25-Jul-20 05:51 PM as somewhat visible in the top-right 25-Jul-20 05:51 PM the reservoir on my chiller has imploded 25-Jul-20 06:44 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-F870F.jpg 25-Jul-20 06:44 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-4A92D.jpg 28-Jul-20 01:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/video0-29619.mov 28-Jul-20 01:28 PM Testing pulsed nozzles 30-Jul-20 10:08 AM @𝓕ermion here are our through-walls 30-Jul-20 10:08 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-15B41.jpg 30-Jul-20 10:08 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-E990D.jpg 30-Jul-20 11:37 AM <𝓕ermion#6024> hehe well done. 30-Jul-20 11:37 AM <𝓕ermion#6024> @idmb what do you think of the polyscience heat exchanger? 30-Jul-20 11:37 AM <𝓕ermion#6024> I just bought one for my pulse tube 30-Jul-20 11:40 AM wait, you're not just running it off the sink? 30-Jul-20 11:40 AM I mean I liked it until the reservoir imploded last week 30-Jul-20 11:43 AM <𝓕ermion#6024> lol 30-Jul-20 11:46 AM It seems to do everything well though 30-Jul-20 11:46 AM temps are stable even with the massive heat load 06-Aug-20 09:02 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200806_175838-A2587.jpg 06-Aug-20 09:02 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200806_173954-2B25A.jpg 06-Aug-20 09:02 AM evap coater is looking good, now we wait and let it pump 06-Aug-20 09:02 AM first test will be Al on a microscope slide 06-Aug-20 09:02 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200806_180653-C1712.jpg 06-Aug-20 09:02 AM yay! 06-Aug-20 09:10 AM Awesome!! 06-Aug-20 10:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200806_192004-74C2B.jpg 06-Aug-20 10:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200806_192037-201F6.jpg 06-Aug-20 10:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200806_192050-D5933.jpg 06-Aug-20 10:21 AM looks like copper doesn't wet the tungsten as well 06-Aug-20 10:21 AM but man this is too much fun :D 06-Aug-20 10:22 AM Wow that’s so cool 06-Aug-20 10:24 AM It's so much fun to watch 06-Aug-20 10:24 AM goes brighter and brighter and brighter and suddenly in a fraction of a second it goes dark because the glass is no longer transparen 06-Aug-20 10:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200806_192541-9E181.jpg 06-Aug-20 10:24 AM you can see the green transparency where the copper is just thin enough 06-Aug-20 10:27 AM I assume the next step is pocket mirrors made of random exotic metals to be sold on Etsy? 06-Aug-20 10:29 AM hmm I like the idea 06-Aug-20 10:29 AM only three in stock get them while they're still not: Sodium pocket mirrors! 06-Aug-20 10:29 AM now I only need a way to measure thickness 06-Aug-20 10:29 AM only 06-Aug-20 10:34 AM Wow, talk about a mirror that would be bad luck to break 06-Aug-20 10:40 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DiligentRashGiantschnauzer-size_restricted-23259.gif 06-Aug-20 11:01 AM No, you need to sell pocket mirrors in the shape of various anime characters... Nothing exotic, just acrylic cut on a laser cutter and coated 06-Aug-20 11:01 AM There's a lot more anime fans than exotic metal fans, I'm sure 06-Aug-20 11:05 AM why not both? 07-Aug-20 06:31 AM @GigaSquirrel try cleaning the tungsten baskets in just store bought ammonia then drip in some hydrogen peroxide and agitate. It will remove all of the oxide in a minute or two. Be sure to rinse it very well in hot water afterwards. The tungsten should be brite and clean afterwards and will allow more stuff to wet to it. 07-Aug-20 06:31 AM Oxides coming off will be in the form of black bits. Moly can be cleaned in the same way but the oxide is removed as a brown cloud that passes into the solution. 07-Aug-20 06:59 AM Wow, very nice job on the evap coater Giga! What are you using for the power supply? Re-wrapped MOT and a variac? 07-Aug-20 07:02 AM @Charles good point, thanks! 07-Aug-20 07:02 AM @Conmega thanks <3 It's a rewound ring core transformer and variac 07-Aug-20 07:04 AM sweet 07-Aug-20 07:04 AM Honestly I like your setup of a basic ISO chamber with some passthroughs on one side and a window, though I'd personally prefer the window to be protected somehow... So it doesn't have to be cleaned as often as the inside of the chamber. Also remember one trick people do is wrap some aluminum foil around the inside walls of the chamber to prevent needing to clean the walls as often :) 07-Aug-20 07:04 AM Suppose I can show my latest project, now that I have power back on and I got these boards in the other day. 07-Aug-20 07:04 AM https://twitter.com/ConnorKrukosky/status/1291586429244575744 07-Aug-20 07:07 AM I have not measured current and voltage yet, don't have a current clamp 07-Aug-20 07:07 AM Assembling these was fun lots of itty parts 07-Aug-20 07:07 AM ah, you can "make" your own current clamp :) hehe 07-Aug-20 07:07 AM I think you can wrap some wire around and do some maths 07-Aug-20 07:08 AM the Al foil is a good point 07-Aug-20 07:08 AM also yes :D 07-Aug-20 07:12 AM What are those boards? 07-Aug-20 07:12 AM Some FPGA thing? 07-Aug-20 07:48 AM looks like pcie to m.2 adapter? 07-Aug-20 07:48 AM not sure what the Power delivery is for... 07-Aug-20 09:51 AM So the FPGA is in an M.2 formfactor, good for a PCIe endpoint device. But not good for a root complex... so you need to go the other way. If you have 12V in off the molex M.2 needs 3.3V and so does a PCIe card, So two 3.3V regulators. The other thing needed is PCIe generally has a topology where there is one ref clock sent to host and end point devices... So the other blob of parts is the 100Mhz ref clock and clock splitter/redriver. 07-Aug-20 06:56 PM Huh, I thought people stopped making FPGA coin stuff since the ASICs came out years ago and blew them away in terms of performance 07-Aug-20 07:04 PM nope, tons of development in that space still 08-Aug-20 05:27 AM There's always some new coin with some new algo 08-Aug-20 09:09 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-97EEF.png 08-Aug-20 09:09 AM I love FeCl3 08-Aug-20 09:11 AM lol 08-Aug-20 02:50 PM https://www.youtube.com/watch?v=h1gCu_vdn9w& 08-Aug-20 02:50 PM slow evaporation also works pretty well 08-Aug-20 03:26 PM nice! 08-Aug-20 03:26 PM what voltage/current to the Al & pressure? 08-Aug-20 03:27 PM I have not measured voltage and current yet, should do that tomorrow 08-Aug-20 03:27 PM around 300-500W 08-Aug-20 03:27 PM pressure is upper e-4 range, didn't bother with baking or longer pumping, I basically started the evap as soon as the turbo hit speed 09-Aug-20 04:07 AM https://gigabecquerel.wordpress.com/2020/08/09/thermal-evaporator-setup/ 09-Aug-20 04:30 PM @GigaSquirrel i don't understand your reasoning about semiconductors being diodes thus sputtering is bad 09-Aug-20 05:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-C6B41.jpg 09-Aug-20 05:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-2A365.jpg 09-Aug-20 05:00 PM My next 3D printing project. Anyone care to take a guess? 09-Aug-20 05:26 PM @nmz787 I could be misunderstanding what he wrote but I think the key part of it is "semiconductor detectors" where they could get charge build up from the sputtering that could cause them to self destruct? 09-Aug-20 05:36 PM Ah 09-Aug-20 10:33 PM exactly! 10-Aug-20 09:06 AM @rdpierce Head of a BB-8? 10-Aug-20 09:06 AM Yassssss! 10-Aug-20 09:06 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-02C45.jpg 10-Aug-20 10:38 AM I "finished" mine pretty much exactly 4 years ago to the day 10-Aug-20 10:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20160814_201808-97934.jpg 10-Aug-20 10:38 AM Please do be careful of the panel gaps! 10-Aug-20 10:38 AM Hard to make them fit well especially if you want animatronic side panels 10-Aug-20 10:38 AM Something I didn't end up putting in just because the gaps are so big 10-Aug-20 10:38 AM This was made with the first delta printer I built, evidently it's not very good compared to today's standards 10-Aug-20 10:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-72CA2.png 10-Aug-20 10:38 AM Sad thing is I've never been able to take it out and play with it, had to hop on a plane 3 days after this was finished and I've never been back 10-Aug-20 12:06 PM Funny you should post that last pic.... 10-Aug-20 12:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-3C5F6.jpg 10-Aug-20 12:06 PM That’s what I’m printing right now. 10-Aug-20 12:06 PM There’s been a lot of changes in the BB-8 Builders Club. 10-Aug-20 12:06 PM Am I correct in assuming there is some kind of molded plastic sphere under that? 10-Aug-20 12:43 PM No, it's pretty much all 3D printed. A cheese wheel design 10-Aug-20 12:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-96E39.png 10-Aug-20 12:43 PM I chose motors that were too small for the flywheel unfortunately 10-Aug-20 12:43 PM Really need the torque to kick the whole thing around 10-Aug-20 12:43 PM So it doesn't steer very well 10-Aug-20 12:43 PM I initially chose ABS because of strength, and then actually moved on to PETG because it holds dimension tolerance so much better 10-Aug-20 03:28 PM PLA here. 10-Aug-20 03:28 PM There’s an injection molded skeleton I am strongly considering. 10-Aug-20 03:28 PM For a moment there, I figured you were going to tell me the internal was a molded acrylic sphere. 10-Aug-20 03:36 PM No, those are overpriced and way too weak 10-Aug-20 03:36 PM Also couldn't find anyone who makes something like that back home 10-Aug-20 03:42 PM What’s overpriced / too weak? Molded sphere? Or the injection molded frame? 10-Aug-20 03:46 PM Molded acrylic sphere 10-Aug-20 03:46 PM At least that was the case 4 years ago, not sure if there is a better supplier nowadays 10-Aug-20 05:02 PM No, there’s exactly one vendor for the right sized sphere. 10-Aug-20 05:02 PM But the BB-8 community went in a different direction years ago. 10-Aug-20 05:02 PM An internal skeleton is what most people use. 10-Aug-20 05:02 PM You can 3D print it. 10-Aug-20 05:02 PM But that’s a lot of printing. One of the major builders did an injection molding run. 10-Aug-20 05:20 PM I didn't keep a detailed record of how much I spent, but printing and designing everything by myself, the filaments probably cost ~$100 in total, including failed parts 10-Aug-20 05:20 PM And that shell is super tough 10-Aug-20 05:20 PM All the printing took a month and a half, with significant downtime due to a cloggy hotend 10-Aug-20 05:24 PM I believe the current design used is different. 13-Aug-20 12:13 PM Behold, the box that decides whether our equipment lives or dies 13-Aug-20 12:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-CC9D1.jpg 13-Aug-20 12:14 PM oh my 13-Aug-20 12:14 PM what does it do? 13-Aug-20 12:21 PM Turns on and off turbopumps, closes pneumatic valves, reads analog pressure gauges, reads status of random binary indicators 13-Aug-20 12:21 PM ohh 13-Aug-20 12:21 PM may its decisions always be in your favor 13-Aug-20 08:31 PM Nice. 14-Aug-20 02:25 AM contains NI USB-6001! 14-Aug-20 06:36 AM That’s so a decade from now when someone is scrapping it, they salvage the expensive bit 14-Aug-20 10:36 PM This is something a summer student in our lab has made: 14-Aug-20 10:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screen_Shot_2020-07-27_at_8.59.00_AM-718F0.png 14-Aug-20 10:36 PM Those are optical fibers, this is just one of the early prototypes 14-Aug-20 10:36 PM the idea is to create a very fine intensity mask to block our laser 14-Aug-20 10:36 PM which we do after a diffraction grating / lens combo, where the laser pulses are separated spatially by wavelength/frequency 14-Aug-20 10:36 PM the line of fibers can be slid in and out, to give variable combs / notches in the spectrum of the pulse, which then turns into temporal oscillations / notches 15-Aug-20 02:31 AM Looks like lasercut plywood 15-Aug-20 06:52 AM That one is ! 15-Aug-20 06:52 AM New models are acrylic with channels to separate one end to make them easier to adjust 15-Aug-20 04:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200815_161141-6AD37.jpg 15-Aug-20 04:11 PM Top gun was on IGP only for a month or two, with no rough or turbo backing. 15-Aug-20 04:11 PM This is after maybe 5 minutes of turbo at full speed. 15-Aug-20 04:11 PM 1.6E-6 torr 15-Aug-20 04:14 PM 5 minutes after spinup? that's pretty slow isn't it 15-Aug-20 04:14 PM 1.8E-7 torr up top 15-Aug-20 04:14 PM Seems good to me anyway 15-Aug-20 04:14 PM Well those 5 minutes the PC was off, so who knows then 15-Aug-20 04:15 PM It's good 15-Aug-20 04:15 PM turbos are really excellent 15-Aug-20 04:15 PM The IGP current came down from 1mA to 300uA within a minute if anyone knows how to calc from that 15-Aug-20 04:15 PM At 148uA now another 5 minutes later 15-Aug-20 04:15 PM Imaging beam quality 15-Aug-20 04:15 PM It's (or will be) 100F outside today but my garage is probably only in the 80s now 15-Aug-20 04:15 PM RP came on with stuttering for only a second or two 15-Aug-20 04:15 PM In colder months it has trouble and I've needed to preheat it with a non-computer controlled power cable, otherwise the software goes into some fault mode 16-Aug-20 11:33 AM Tested some new inserts on the lathe and made a case for my new scintillator 16-Aug-20 11:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/P1030827-B2F80.JPG 16-Aug-20 11:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/P1030829-0E7E1.JPG 16-Aug-20 11:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/P1030834-CDCB1.JPG 16-Aug-20 11:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/P1030842-AB7D2.JPG 16-Aug-20 11:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/P1030838-C4DA3.JPG 16-Aug-20 11:33 AM it's an Al cap with 0.5 mm wall thickness on the front, glued into an SS pipe with black epoxy 16-Aug-20 11:33 AM this paint is so incredibly strong, it's amazing 16-Aug-20 11:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/P1030843-842C9.JPG 16-Aug-20 11:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/P1030844-563A9.JPG 16-Aug-20 11:33 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/P1030845-3FF29.JPG 16-Aug-20 09:54 PM which epoxy is that? 16-Aug-20 10:36 PM Uhu endfest 300 16-Aug-20 10:36 PM It's some industrial epoxy glue I've had great results with 17-Aug-20 01:24 AM and with that paint it's pretty much 100% light tight 17-Aug-20 01:24 AM can't wait for it to cure so I can machine the rest and finish this probe 17-Aug-20 01:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/P1030846-33DC3.JPG 17-Aug-20 01:24 AM having a reflector on the unused photocathode area and around the pmt should give 0.1 to 0.2% improvement in Resolution 17-Aug-20 06:27 AM It looks beautiful. But why use epoxy rather than thread it? 17-Aug-20 11:32 AM Thanks 17-Aug-20 11:32 AM it's glued because my lathe can't do threads 17-Aug-20 01:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-2D574.png 17-Aug-20 01:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-02927.png 17-Aug-20 01:04 PM don't want to lose any of the precious photons 17-Aug-20 01:04 PM I'll clean up the cap tomorrow and turn an endcap 17-Aug-20 08:10 PM new parts for project arrived.. 1000 1mm steel loose balls 17-Aug-20 08:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_1856-041C9.jpg 18-Aug-20 07:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-D5196.png 18-Aug-20 07:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-61858.png 18-Aug-20 07:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-EE433.png 18-Aug-20 07:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-AA620.png 18-Aug-20 07:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-99F8C.png 18-Aug-20 07:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-C2725.png 18-Aug-20 07:07 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-EB074.png 18-Aug-20 07:07 AM I'm properly proud of this thing 18-Aug-20 07:21 AM that looks awesome ^^ 18-Aug-20 07:23 AM thanks ❤️ 18-Aug-20 03:39 PM You should be proud. Wow. 18-Aug-20 09:50 PM nice job! 18-Aug-20 10:58 PM Thanks ^^ 19-Aug-20 02:24 PM want that new mcp pretty badly 19-Aug-20 02:24 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-344CF.png 19-Aug-20 02:25 PM but hey, at least it looks pretty 19-Aug-20 02:27 PM fixed 19-Aug-20 02:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-E9613.png 19-Aug-20 02:54 PM Is that just a dark run? 19-Aug-20 02:57 PM No, that's nitrogen being broke apart by the femto pulse. It's supposed to look like this, but it's slightly off-centre so not quite as nice 19-Aug-20 02:57 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-61F6D.png 19-Aug-20 02:57 PM But the middle of this detector is super (relatively) dead 19-Aug-20 03:06 PM Oh. Thats almost as bad as that being a dark run 20-Aug-20 06:32 PM Waiting on a 5/16-24 tap/drill to arrive to finish this off but I finally got tired of waiting to find a decent 4.5" conflat eBay buy. Decided to make this aluminum 4.5" conflat to KF40 flange and just use an o-ring instead of a copper gasket to at least be able to use my turbo a bit instead of having it waiting for an eBay score. 20-Aug-20 06:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200820_002309-3AED8.jpg 20-Aug-20 08:05 PM Fingers crossed for 1E-9! 23-Aug-20 08:42 AM I’m wondering if there are engineering diagrams of dimensions of vacuum flanges online somewhere convenient. Preferably fully dimensioned diagrams from which one could machine something. 23-Aug-20 08:42 AM Or 3D CAD models. 23-Aug-20 08:42 AM I’ve seen plenty of partially dimensioned drawings. 23-Aug-20 08:48 AM You mean basically just PDFs of standard parts ready to hand to someone with a manual mill/lathe? 23-Aug-20 08:54 AM I’m wondering if there are engineering diagrams of dimensions of vacuum flanges online somewhere convenient. Preferably fully dimensioned diagrams from which one could machine something. @rdpierce https://www.novotek-vacuum.com/ They have STEP files for almost all their products 23-Aug-20 09:03 AM Perfect! 23-Aug-20 09:13 AM If that's all you want, KJL has most too. 23-Aug-20 09:44 AM Yep Lesker has a CAD library that is very handy, haven't used novotek's site before but looks like they have similar stuff. Lesker has alllllll the different flange types that you can think of basically. 24-Aug-20 10:42 AM Spirit used STEP's from some company to model his system for mechanical fit. 25-Aug-20 11:44 AM Pump city 25-Aug-20 11:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-387B1.jpg 26-Aug-20 11:48 AM https://twitter.com/peterbjornx/status/1298693250006556672 26-Aug-20 11:48 AM Quick writeup of my microscope project, longer blog post coming soon (tm)(anywhere from tomorrow to half a year or so depending on adhd...) 26-Aug-20 11:53 AM oof twitter is not a nice medium to read stuff like that on, neat project and good results though! 26-Aug-20 11:55 AM you can always reply asking thread reader app to unroll 26-Aug-20 12:01 PM I'd need a twitter account for that 26-Aug-20 12:01 PM I'm sure the UI is fine if you're used to it 26-Aug-20 12:02 PM https://threadreaderapp.com/thread/1298693250006556672 31-Aug-20 01:31 PM https://twitter.com/peterbjornx/status/1300528433445965826 Demo of piezo based fine focus on my microscope 01-Sep-20 07:32 AM Cool 03-Sep-20 12:34 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200903_003209-C6FBD.jpg 03-Sep-20 12:34 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200903_003416-8A78B.jpg 03-Sep-20 12:34 AM Glass pipette coated with graphene for grounding 03-Sep-20 12:34 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200902_013823-40F6D.jpg 03-Sep-20 12:34 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200902_172111-A75B9.jpg 03-Sep-20 12:48 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200903_004807-D68FC.jpg 03-Sep-20 12:48 AM 278nm diameter on that tip 03-Sep-20 01:59 AM https://youtu.be/O5JvPfzl8RQ 03-Sep-20 02:26 AM Tilted back to 0, corrected stig on my faraday cup, cutting again higher up the tip 03-Sep-20 02:26 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200903_022656-54857.jpg 03-Sep-20 02:26 AM Didn't even need to tilt this time to check the inner diameter 03-Sep-20 09:44 AM pumpedipump 04-Sep-20 08:17 AM I just got: a thingy! 04-Sep-20 08:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200904_161703-8BAD9.jpg 04-Sep-20 02:22 PM Thing get! 04-Sep-20 05:29 PM What even is that other than cool looking 05-Sep-20 06:52 AM Its a sample plate for a mass spectrometer. You plop your samples in the little circles, the golden thingy moves the plate around in the XY axis and then the little circles get hit by a laser 05-Sep-20 06:49 PM Noice I never thought to take pics of the mass specs at the lab I work lol 05-Sep-20 06:49 PM Should do that sometime 09-Sep-20 11:25 AM @mike crb various viewports made with glue 09-Sep-20 11:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-98B87.jpg 09-Sep-20 11:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-C67AB.jpg 09-Sep-20 11:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-E8FB9.jpg 09-Sep-20 11:25 AM Epoxy + o ring + epoxy + glass is funny 09-Sep-20 11:28 AM Looks like it'll work for me! 09-Sep-20 11:28 AM it probably doesnt have to be a weld flange then right? can I get away with cutting a flange off of a cross? 09-Sep-20 11:37 AM Oh yeah for sure 09-Sep-20 11:37 AM I just don't see why you'd ruin a cross that way when a weld flange is like $10 09-Sep-20 12:42 PM have no kf40 parts, this cross will only be used for this project, and I need two viewports so overall cost I figured would be lower than 2 weld flanges, clamps, etc 09-Sep-20 12:50 PM Then sure! Cut should be at least half-decent I think though. 09-Sep-20 11:02 PM glueport 13-Sep-20 02:18 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Eh0c-bsVgAAPsKv-B5FA7.png 13-Sep-20 02:18 PM i need to make a 13.25" window for this 13-Sep-20 02:18 PM i was thinking about getting a rotatable flange and replacing the inner disk with some glass 13-Sep-20 02:20 PM Whatcha makin? 13-Sep-20 02:20 PM i don't really know i just have these parts and want to make them functional 13-Sep-20 02:20 PM Lmao relatable 13-Sep-20 02:27 PM @adammunich you can just use a piece of acrylic if you don't have a plan 13-Sep-20 02:28 PM my worry is i'd shatter something and break the $5k pumps 13-Sep-20 02:29 PM acrylic is strong 13-Sep-20 02:30 PM i really haven't much clue what I am doing 13-Sep-20 02:30 PM I don't even know if the 400Lps pump or 15lps pump is appropriate 13-Sep-20 02:30 PM Depends on what you're trying to do. 13-Sep-20 02:30 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-02B38.png 13-Sep-20 02:31 PM ++ acrylic. I can get mine down to ^-5 Torr without much worry. If you're dealing with KF & orings acrylic is probably fine 13-Sep-20 02:31 PM I prefer the o-ring seals to the CF seals anyway 13-Sep-20 02:31 PM Cheaper 13-Sep-20 02:31 PM You can use an O-ring on CF flanges too. 13-Sep-20 02:32 PM that was my plan for the big window, to find some viton oring or whatever which will fit inside a 13.25" rotatable 13-Sep-20 02:32 PM which has an 11.5" inner diameter 13-Sep-20 02:32 PM then, reverse mount the rotatable flange so the lip squishes the plate onto the flat bit of the mating flange 13-Sep-20 02:32 PM the other half of the chamber has a 12" flange, it seems like 12" to 8" zero length reducers are gonna burn a fine hole in my pocket 13-Sep-20 02:32 PM best quote so far was $500 lol 13-Sep-20 02:35 PM 12" is huge 13-Sep-20 02:35 PM yeah, 8" seems more useful for messing around 13-Sep-20 02:35 PM 8" reducers from there, are not so expensive 13-Sep-20 02:36 PM 10" is just enough nicerly bigger than 8" that you can easily fit your hands in inside if you're working on it 13-Sep-20 02:36 PM but yeah 8" is super popular. 13-Sep-20 02:36 PM there's three 6" ports on the chamber so getting inside is ok 13-Sep-20 02:36 PM i woul LOVE a 13.25" door with a view port but it seems that the semiconductor business is not that cool 13-Sep-20 02:37 PM I think you'd be fine with just a 13.25" 1" thick piece of acrylic with the bolt holes, no o ring groove or anything, and a thick flat o ring in the copper gasket slot 13-Sep-20 02:39 PM the 13.25" ebay flange I am looking at is only $130 so I am ok with that, my life experience with PMMA tells me that putting bolts in it directly is recipe for cracks over time 13-Sep-20 02:40 PM There shouldn't be that much stress on the bolts 13-Sep-20 02:40 PM They're mostly to hold it in place / stop someone from lifting one side. The vacuum force on a flange that size is HUGE. 13-Sep-20 02:41 PM 1.2kN! 13-Sep-20 02:41 PM i also have this, but haven't even looked at it closely yet. I buried it in the shrubs at the farm for now. they seem to have done something similar where a flange compresses a disk against a gasket seal. 13-Sep-20 02:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/TjLu0Fe5e_3OVRpw7gj7Kkd5d5Uk0RhpnoTdKP_RCv-0C352.png 13-Sep-20 02:43 PM gross lol 13-Sep-20 02:43 PM although I am not sure if that is /actually/ rated for vacuum pressure, it has gloves so maybe only mild vacuum 13-Sep-20 02:43 PM some ANSI stuff over on the right though 13-Sep-20 02:44 PM some ANSI stuff over on the right though @idmb that was a water UV irradiator, i saved that from the scrapyard also 13-Sep-20 02:44 PM maybe against my better judgement lol 13-Sep-20 02:46 PM @idmb @adammunich for the acrylic a one inch thick plate covering a 13.25" area would only have -0.106mm deflection in the center...if the calculator + specs for acrylic i have been using for things is somewhat accurate 13-Sep-20 02:47 PM that sounds reasonable 13-Sep-20 02:47 PM 1" would definitely be safe for that size...could probably get away with 0.75" 13-Sep-20 02:47 PM how well does your calculator account for what happens if someone accidentally drops something heavy directly in the middle of it? 13-Sep-20 02:47 PM hah 13-Sep-20 02:47 PM they would have to toss a football, the port will be vertical like a television 13-Sep-20 02:47 PM so you can get your fill of ion sparkles and x-rays if you're reckless 13-Sep-20 02:48 PM 13-Sep-20 02:48 PM acrylic is surprisingly forgiving in my experience too 13-Sep-20 02:48 PM no commercial breaks 13-Sep-20 02:50 PM I went with 1" for ISO 250 because Sanatron sells them at slightly under 1" 13-Sep-20 02:50 PM maybe PMMA is better from a cost perspective, but, glass seems like it would be easier to clean if I accidentally sputter stuff onto it 13-Sep-20 02:50 PM one of the experiments I want to try is coating plastic optics with rhodium 13-Sep-20 02:50 PM I think it will solve reliability issues I have been having with our AR headsets 13-Sep-20 02:51 PM you can put a thinner sheet of acrylic on the inside and just scrap that when it gets too coated 13-Sep-20 02:51 PM oh that's a good idea, i was thinking aluminum foil but I like that 13-Sep-20 02:51 PM 30 bolts to swap it though lol 13-Sep-20 02:52 PM haha yeah gotta put all the bolts in 13-Sep-20 02:52 PM every last one.... 13-Sep-20 02:52 PM or buy a ridiculous 13" VAT gate valve 13-Sep-20 02:53 PM You probably only need four bolts 13-Sep-20 02:53 PM if you're using an O-ring 13-Sep-20 02:53 PM i threw together a hacky aluminum evaporative coater and just use ferric chloride and a q tip to clean the aluminum off when it turns the acrylic into a mirror...do not think that would work for rhodium but maybe? 13-Sep-20 02:53 PM i regret not getting that when I had the chance 13-Sep-20 02:53 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/XsiCq-GbZRjLqGKMxKtr7EsGcGfnlqGQEM2aVsZXHD-1D904.png 13-Sep-20 02:53 PM the massive number of bolts on CF flanges is to crush the copper gasket just perfectly 13-Sep-20 02:53 PM the massive number of bolts on CF flanges is to crush the copper gasket just perfectly @idmb yeah with a viton gasket I can probably use 1/2 the number or fewer 13-Sep-20 02:54 PM I think you can probably use just four 13-Sep-20 02:54 PM I halved the number on my ISO-250 flange and it's above a bit more than 5k of stuff 13-Sep-20 02:55 PM i threw together a hacky aluminum evaporative coater and just use ferric chloride and a q tip to clean the aluminum off when it turns the acrylic into a mirror...do not think that would work for rhodium but maybe? @LRM the purpose of rhodium would be to make it hard to remove from the plastic, would need aqua regia or something 13-Sep-20 02:55 PM i've been having issues with sweat melting off the beamsplitter coatings 13-Sep-20 02:55 PM sounds like a perfect place for disposable coverings on the window then 13-Sep-20 02:57 PM i think actually, I could make some thin plastic sheet that can be rolled up and installed behind the window through the 6" quick access doors 13-Sep-20 02:57 PM like 0.5mm sheet or whatever 15-Sep-20 06:13 AM Been collecting fittings/hoses/gauges/etc for a while and was about to start machining and welding a chamber when I saw this... snagged it instead for a respectable price. needs some work but I'm pretty stoked 15-Sep-20 06:13 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/0PfALX0b0J5erRnLaY_zfUo3B-1GnON54KqRz67fhN-158AD.png 15-Sep-20 07:49 AM That is pretty nice looking 15-Sep-20 07:49 AM Is it aluminum? Weird colour 15-Sep-20 07:58 AM Chamber appears to be stainless. the lower portion is some kind of sheet metal jacket which attaches to a cooling fan (back left), I'm assuming that's just some kind of mild steel that's been sandblasted or painted or something 15-Sep-20 07:58 AM and those big figure-8 things... i dunno what they are made from. some kind of casting. But it turns out they encase magnets: top and bottom halves have different polarity and the inside has a wire cage structure. pretty sure it's some kind of "diy" ionization vacuum gauge 15-Sep-20 07:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/xpLSKDc6P9AauwTB3KLXzAOG42GYi0XuzVd2HLDQe8-598C7.png 15-Sep-20 08:07 AM Any idea where it’s from? 15-Sep-20 08:07 AM Magnets like that are used on electron guns 15-Sep-20 08:11 AM no idea unfortunately, came from a surplus liquidator. has a big "General Electric" label on the cooling jacket but otherwise no indication where. Think it was used for for PVD... the lower section has feedthroughs which held a filament, and you can see some discoloration on the bottom of the chamber. Also some water cooling channels at the top (i think) amongst the other feed throughs 15-Sep-20 08:11 AM there's a "figure 8" magnetic assembly on both sides of the chamber which is a bit odd 15-Sep-20 08:11 AM The metal wire connects the wire cages on both side together. the perpendicular black assembly unde the wire is the filament holder/feedthrough, and the rest are copper feeds or water cooling lines. dunno, weird 15-Sep-20 08:11 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/GZ2QUuca0Xw1pV5hpM9e9vYKo1tSmNNUkpqE_iG2eU-CFC7F.png 15-Sep-20 06:28 PM @polyfractal Ooh, a good old 60's vintage e-beam deposition chamber! Used to own one from varian myself. Watercooling and hv feedthroughs for gun, separate hv feed for the bottom ion pump(s) with the big magnet and multiple cf valves for attaching sorbtion pumps to the chamber. Did you get a bell jar for it? Lovely general purpose chambers if you have enough multipin feedthroughs. 15-Sep-20 06:33 PM @hanstj oh, neat! I considered ion pumps at first but then got confused and doubted since they didn't look quite like I expected... although might just be missing components. Wonder if I could refurb them to continue working as ion pumps I guess all the e-beam parts would be sitting above the filament area, maybe on those three standoffs? No bell jar unfortunately, I was going to use a big plate of aluminum to top it off. 15-Sep-20 06:33 PM although I do have a large SS chamber for vacuum degassing silicones and such, which is the right diameter... i wonder if that would work as a bell jar hmm 15-Sep-20 06:38 PM I mean you could make a pretty simple adapter from aluminum 15-Sep-20 06:38 PM and then if you waterjet out the middle, you'd save a ton of aluminum 15-Sep-20 06:39 PM They'd probably still work as ion pumps as long as the plates aren't corroded. Yes and no. Those standoffs may have been used, but in my experience they have been used to attach a wafer carousel or holder, the gun itself was often attached to a rotary/linear feedthrough. Too bad, but yeah, a flat alu block is way easier to clean than a glass bell jar. Safer too! 15-Sep-20 06:39 PM Haven't seen an air cooling skirt on an entire chamber before, that's kinda neat 15-Sep-20 06:40 PM yeah thought that was a neat/odd feature, i've only seen water cooling coils before 15-Sep-20 06:40 PM nifty! not sure i'm motivated/knowledgeable enough to refurb it back into an e-beam system... although that'd be pretty cool. maybe someday 15-Sep-20 06:45 PM Yeah, those guns are kind of rare online and hard to get right diy, but the flange count on thesr chambers is just excellent 15-Sep-20 06:46 PM all those conflats are gonna put me in the poorhouse i was originally stockpiling for a KF-based system heh 15-Sep-20 06:47 PM Do you have a lathe? 15-Sep-20 06:47 PM cnc and manual mill, but no lathe (working, anyhow... it's in pieces. long story ) 15-Sep-20 06:47 PM Conflat only needs to be done properly for UHV stuff. 15-Sep-20 06:47 PM You can just do a basic groove + o-ring if you're not going wayyyy down 15-Sep-20 06:48 PM ah interesting 15-Sep-20 06:48 PM So even a wimpy cnc can cut suitable aluminum flanges 15-Sep-20 06:48 PM that makes my wallet much happier, good to know! 15-Sep-20 06:48 PM so don't even bother with the knife-edge bit, just a normal oring groove? 15-Sep-20 06:48 PM You can just do a basic groove + o-ring if you're not going wayyyy down Durp you said that 15-Sep-20 06:51 PM Basically. Knife edge lets you use the "proper" CF o-rings easily 15-Sep-20 06:52 PM cool! might whip some up this weekend... have a few empty flanges I need to block off, and a few to adapt to parts I already have 15-Sep-20 06:52 PM @hanstj the grids seem to be in pretty good shape still. Going to pull them out completely to get a better look once I start cleaning everything 15-Sep-20 06:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/MRuQqGFTe3Nh75m96WE8RjOPO1VVYrTS_ERM9O7b9_-9D83E.png 15-Sep-20 06:59 PM CF rubber gasket sits just behind the knife edge 15-Sep-20 06:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-26EEE.jpg 15-Sep-20 06:59 PM This flange just seals to a flat surface 15-Sep-20 06:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-D294F.jpg 15-Sep-20 07:04 PM awesome... not sure why that didn't occurr to me before guess I was just assuming conflat had to be done the "proper way" to work 15-Sep-20 07:04 PM conflat has to be done the proper way for the benefits of conflat to shine 15-Sep-20 07:04 PM But most of us use it for no good reason 15-Sep-20 07:07 PM hehe yep 15-Sep-20 07:07 PM cool! i think i'm just about ready to start cleaning and assembling everything in that case, can whip up blanks and adapters as needed 15-Sep-20 07:09 PM Having suitable gaskets is more important than the quality of your blank imo 15-Sep-20 07:14 PM ah that was something i was wondering about... should i splash out for properly vacuum baked viton from a vacuum supply house, or can i get away with some generic viton from mcmaster and and maybe throw it in the furnace for a few hours to evaporate out the worst of the contaminants? 15-Sep-20 07:15 PM you can just use the viton from mcmaster as-is, for most stuff. 15-Sep-20 07:20 PM But if you start getting into the territory where you want to use an ion pump then stuff like that won't work 15-Sep-20 07:21 PM yah makes sense. i think i'm a ways away from that point right now. main goal is to play with some thermal evaporation to start, which seems about the simplest project to start getting used to vacuum operations 16-Sep-20 04:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-4AC6E.jpg 16-Sep-20 04:11 PM My Fialka restoration is running up against a mechanical problem. The lever that resets the keyboard doesn’t seem to be moving enough to properly latch the “trigger” mechanism. Either that or there’s a higher order issue with velocity / acceleration. 17-Sep-20 08:21 AM got a nice valve 17-Sep-20 08:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-05086.jpg 17-Sep-20 08:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-ED072.gif 17-Sep-20 08:21 AM Have a couple of those! They're nice, work great for UHV, unless you overtighten them then they become HV valves 17-Sep-20 08:21 AM but the seal is replacable, but academics don't repair 17-Sep-20 08:22 AM yes 17-Sep-20 08:23 AM we have three small adjustable wrenches 17-Sep-20 08:23 AM but only one opens wide enough to turn those 17-Sep-20 08:23 AM idk why. 17-Sep-20 08:24 AM they also go for xhv 17-Sep-20 08:24 AM but I never damaged one of them 17-Sep-20 08:24 AM maybe I'm to weak 17-Sep-20 08:25 AM they'll only do XHV if you have UHV on the other side, right? 17-Sep-20 08:25 AM too soft 17-Sep-20 08:25 AM yes 17-Sep-20 08:25 AM or I dunno 17-Sep-20 08:25 AM Regular gate valve ratings are based on what pressure they seal the ensemble to if the valve is in the open state 17-Sep-20 08:25 AM so a UHV gate valve is needed if you want both chambers at UHV 17-Sep-20 08:26 AM pinched copper tubes seal against normal dirty atmosphere 17-Sep-20 08:26 AM but for XHV youre pumping of course 17-Sep-20 08:27 AM but if you only want the one on the "closed" side at UHV, from VAT you can use most of their regular HV valves. the internal mechanism doesn't improve with UHV, only the sealing to atmosphere on the mechanism side 17-Sep-20 08:28 AM yes 17-Sep-20 08:28 AM SMH at how terrible the datasheets and webpages are at conveying this 17-Sep-20 08:30 AM yeah those bad datasheets everywhere! 17-Sep-20 08:33 AM You buy the valve and ask for a CAD model and it takes 6 weeks 17-Sep-20 08:33 AM for the CAD model? 17-Sep-20 08:34 AM yeah 17-Sep-20 08:37 AM nasty 17-Sep-20 02:19 PM What could go wrong ? 17-Sep-20 02:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-F048A.jpg 17-Sep-20 02:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-77214.jpg 17-Sep-20 02:20 PM How do I delete other people's posts 17-Sep-20 02:24 PM It works 17-Sep-20 02:24 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-9D966.jpg 17-Sep-20 04:00 PM Adapt improvise overcome 17-Sep-20 04:06 PM explode 20-Sep-20 07:35 AM today is a good day 20-Sep-20 07:35 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200920_163455-1EE20.jpg 20-Sep-20 08:26 AM Oh my 20-Sep-20 08:26 AM It even came with the skirt 20-Sep-20 08:28 AM it came with everything 20-Sep-20 08:30 AM No cryoshield for the second stage 20-Sep-20 08:30 AM And the helium filter thing in the compressor might need replacing 20-Sep-20 08:32 AM fair 20-Sep-20 08:32 AM but I also have another adsorber 20-Sep-20 08:52 AM it's not disgusting looking either 20-Sep-20 08:52 AM so that's a plus 20-Sep-20 09:14 AM water cooling definitely had a leak 20-Sep-20 09:15 AM Internally or just at that fitting? 20-Sep-20 09:15 AM but all the components are lifted above the floor, so they didn't get wet 20-Sep-20 09:15 AM fitting 20-Sep-20 09:16 AM What model is the cold head? 20-Sep-20 09:16 AM leibold rdg 510 20-Sep-20 09:16 AM rgd? 20-Sep-20 09:30 AM nice, the leybold ones were the most expensive we looked into 20-Sep-20 09:30 AM they're used in some windmills or something 20-Sep-20 09:31 AM oh lol 20-Sep-20 09:49 AM for superconductors in windgenerators? 20-Sep-20 09:50 AM I guess. I remember I was researching cold head options and there was a big leybold PDF with applications and one was in the back of a big windmill 20-Sep-20 09:52 AM ah ok, saw that in journals with research papers, would be awesome if it's already used in production systems 20-Sep-20 09:52 AM but stirling cooled HTS stripline filters were used for 199x GSM BTSes, right 20-Sep-20 10:31 AM @N00N yup, I have one of those filters! 20-Sep-20 10:31 AM It's a thallium based superconductor 20-Sep-20 10:59 AM from STI right? 20-Sep-20 12:09 PM HDD shutter lol 20-Sep-20 12:09 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-CAB19.jpg 20-Sep-20 12:09 PM It’s rare these tables are visible 20-Sep-20 12:09 PM pokes one mirror 20-Sep-20 12:09 PM https://i.pinimg.com/originals/23/1d/56/231d56851e5c4a884b6d6eb254f2cf10.gif 20-Sep-20 12:12 PM it actually matters a lot more in my setup than theirs 20-Sep-20 12:12 PM the ultrafast beams take a long time to warm up the optics 20-Sep-20 12:12 PM so if you adjust a mirror, even if you move it back you have to wait for it to settle, for like an hour 20-Sep-20 12:12 PM Theirs is just a bunch of modular things 20-Sep-20 12:12 PM with fibers in between 20-Sep-20 12:12 PM so if you mess up one part, it doesn't affect later stuff because you just fix what you broke back to the fiber 20-Sep-20 12:13 PM Yeah, those things look like a mess but they're not QUITE that bad. It's just a bunch of set ups more or less 20-Sep-20 12:13 PM With each set up not too bad 20-Sep-20 01:49 PM There is a table colloquially known as "the Rubidium setup" covers three separate 4'x8' optical tables and is more densely packed with optics than the one you put up @idmb. It takes the better part of a month to align and hit thermal stability. The various shutdowns due to COVID and fires have not made that lab happy. 20-Sep-20 02:02 PM the rubidium setup here is across the hall 20-Sep-20 02:02 PM takes a month plus of baking for their purposes 20-Sep-20 02:02 PM Rb eats viewports, too. After about 4-6 years of use. Reported both here & queensland 20-Sep-20 03:30 PM When I want to impress upon coworkers the challenges of laser safety when I feel their respect is, perhaps. not high enough I take them to this lab and say "One of the five beams stats HERE. Trace it across the entire table. Go!" 20-Sep-20 03:32 PM and then you have this 20-Sep-20 03:32 PM https://www.youtube.com/watch?v=Q8zC3-ZQFJI 20-Sep-20 03:40 PM Yes. When snarky students share that with me, I usually tell them that this certainly seems to be what they're trying to build every time and they should stop it. 20-Sep-20 03:41 PM looks at her project list 20-Sep-20 03:41 PM finds 2 projects involving lasers 20-Sep-20 03:41 PM looks at self 20-Sep-20 03:45 PM How well does that work with students from that lab? 20-Sep-20 05:00 PM This was 20cm off focus and still burned 20-Sep-20 05:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-EB2CB.jpg 20-Sep-20 05:10 PM There is usually some mild shame, I remind them that the covers aren't just there to keep their optics clean and to please use them. 20-Sep-20 05:17 PM The sides or the top? Our tops are clear... 20-Sep-20 08:02 PM from STI right? @N00N yes 20-Sep-20 11:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200919_124124-892C1.jpg 20-Sep-20 11:00 PM I'm stumped, what do you think it is 20-Sep-20 11:00 PM Flange says Varian 20-Sep-20 11:14 PM Ion pump? 20-Sep-20 11:16 PM Hm 20-Sep-20 11:17 PM Doesn't seem to come with a magnet, I guess that plate is the mounting bracket for the magnet? 20-Sep-20 11:17 PM There is an internal cylinder inside the cylinder 20-Sep-20 11:17 PM It would look something like this 20-Sep-20 11:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-DFCF1.png 20-Sep-20 11:17 PM Yeah makes sense for an ion pump 20-Sep-20 11:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Diagram-of-how-a-diode-sputter-ion-pump-op-219DF.png 20-Sep-20 11:18 PM That looks correct, so it is missing speaker magnet 20-Sep-20 11:18 PM Probably not strong enough 20-Sep-20 11:18 PM Magnet strength and size needs to be within a certain range 20-Sep-20 11:19 PM Missing its giant neodymium ring magnet then 20-Sep-20 11:22 PM Well you want the ions to travel in an gyrating orbit of the right size to actually be implanted into the titanium walls. You can tune this with how much voltage you apply to the anode, but I think actually for such a small pump it's not that worthwhile 20-Sep-20 11:22 PM It's most likely meant for instruments or detectors, and so the pumping speed is extremely slow 20-Sep-20 11:22 PM Probably 2 L/s tops 20-Sep-20 11:22 PM Under optimal conditions, with fresh Ti wall 20-Sep-20 11:22 PM And of course only useful in UHV 20-Sep-20 11:23 PM So, electrical feedthru it is then 20-Sep-20 11:23 PM Or, maybe some instrumentation pump 20-Sep-20 11:29 PM I think with a conflat turbo and lots of pumping time on a clean system without virtual leaks, you can get deep into 1e-7 to 1e-8 Torr. I can't think of many application for hobbyists at home that would need a vacuum level beyond that for an extended amount of time 21-Sep-20 07:06 AM Tiny ion pump. Varian made them by the bucketloads. The magnet is just missing. They were slip on style magnets so this pump body could be baked. Also you would need a power supply. This one is a tiny maintenance pump. 21-Sep-20 08:37 AM we just moved a 2'x2'x1' ion pump 21-Sep-20 11:08 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200914_110801641-43A85.jpg 21-Sep-20 11:08 AM How bad an idea is a KF40 acrylic viewport? 21-Sep-20 11:10 AM If it's thick enough, 0.01% bad 21-Sep-20 11:10 AM If you're gonna blast it with a high power UV laser... 21-Sep-20 11:10 AM If you completely mess up the dimensions, the clamp could stress it quite badly & you'd be better off just using a little bit of tape / letting the vacuum hold it in place 21-Sep-20 11:11 AM No cracks so far but tightening the clamp was definitely a bit stressful 21-Sep-20 11:12 AM why bother tightening it? 21-Sep-20 11:12 AM just close it enough it won't pop off 21-Sep-20 11:14 AM Yeah I left it at the point where I could squeeze the clamp together and get the wing nut past the other arm of the clamp. Just was a moment there where you really don't know if it will crack suddenly 21-Sep-20 11:16 AM How thick is the thin part? 21-Sep-20 11:19 AM The sheet I cut the round out of is 1/4" which in acrylic land is around 0.220in. The flange has identical dimensions to a standard KF40 blank so around 0.12in on the outer edge for the thinnest spot? 21-Sep-20 11:19 AM Centering ring cut would be the next thinnest area but that has the full thickness of the acrylic sheet to work with so probably around that same thickness there 21-Sep-20 11:20 AM thinner than I'd go but most definitely fine imo 23-Sep-20 09:11 AM well, the He compressor is in a fun condition 23-Sep-20 09:11 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200923_180408-4B79A.jpg 23-Sep-20 09:11 AM not as bad as it looks because all parts are lifted off the bottom but still 23-Sep-20 09:11 AM need to remove everything and repaint the base 23-Sep-20 09:23 AM Heck 23-Sep-20 09:34 AM You'll know more about that single compressor unit than you wish when your done :') 23-Sep-20 09:39 AM Yep 23-Sep-20 10:07 AM Someday...I still need to get a helium tank to try refilling my He compressor 23-Sep-20 10:07 AM Any luck getting yours to run so far or was it in too much of a mess to try it? 23-Sep-20 10:08 AM I don't have watercooling set up yet, but the friend I got it from tested it and said it works 23-Sep-20 10:08 AM Ahh mine is air cooled, forgot water cooling was used on a lot 23-Sep-20 10:09 AM most even 23-Sep-20 10:09 AM like 5L/min 23-Sep-20 10:09 AM for testing you can sink-cool though? 23-Sep-20 10:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200923_190948-7CDFA.jpg 23-Sep-20 10:10 AM I have absolutely no idea how much that is in real units 23-Sep-20 10:10 AM bit late for that now, it's already mostly disassembled 23-Sep-20 10:11 AM That is a water hungry system 23-Sep-20 10:11 AM Oh wait that is 1gpm at 80F 23-Sep-20 10:12 AM gotta remove ~1.8 kW 23-Sep-20 10:12 AM it's about 1/5th what a regular faucet can do 23-Sep-20 10:12 AM I wonder how much it actually needs at regular tap temperatures 23-Sep-20 10:12 AM Sounds like you will want to have a water outlet temperature sensor interlock though... 23-Sep-20 10:13 AM they usually do internally 23-Sep-20 10:13 AM Doesn't look like much is left inside it 23-Sep-20 10:13 AM I think my pump has warning at 60C, shutoff at 70C, damage at 120C? 23-Sep-20 10:13 AM measuring the actual component that matters, not the water 23-Sep-20 10:41 AM well that was fun 23-Sep-20 10:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/P1030894-20620.JPG 24-Sep-20 06:45 PM Well that’s not wasted water. You are supposed to use a chiller/recirculator 25-Sep-20 03:35 PM Well now I need a Nim rack 25-Sep-20 03:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200925_153437-BF0B3.jpg 25-Sep-20 03:36 PM Nice! I own a 659 and a 556, which I use for my HPGe and NaI’s, respectively. 25-Sep-20 03:36 PM I’ve tried to use an Ortec LN2 alarm module but run into problems. 25-Sep-20 03:36 PM Tried to get it to work with the bias inhibit on my 659 with no luck. 25-Sep-20 03:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-6AEFE.jpg 25-Sep-20 03:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-CBDCD.jpg 25-Sep-20 03:36 PM This 3D print had me very nervous. First attempt came loose from the bed. Hence the massive brim. 25-Sep-20 03:38 PM Is that BigBB? 25-Sep-20 03:39 PM BB-8. 25-Sep-20 03:39 PM That's a very big BB, glad it came out alright 25-Sep-20 03:40 PM The print is only 3mm thick, designed to fit on an injection molded sphere skeleton that holds the drive unit and the magnet mast for the head. 25-Sep-20 03:40 PM That is one of 8 triangle pieces. I also need to get 6 circular dishes printed, but they’re 3 mm as well, can’t really be printed in 2 pieces, so I’m working with a friend who has a larger 3D printer. 27-Sep-20 10:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200927_134340-8B828.jpg 27-Sep-20 10:49 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20200927_184846-FA2CA.jpg 27-Sep-20 10:49 AM cleaned and repainted the compressor base 27-Sep-20 10:55 AM Pretty 27-Sep-20 10:59 AM thanks ^^ 27-Sep-20 11:04 AM Looks nice, what happened on the left cylinder with that spot of black paint ? 27-Sep-20 11:08 AM had a bit of rust on it 27-Sep-20 01:02 PM Wow. Nice. 27-Sep-20 01:03 PM can't wait to actually try this thing 27-Sep-20 01:23 PM How much power does the compressor take? And how old is the absorber? 27-Sep-20 01:23 PM 1.7 kW and no information 27-Sep-20 01:23 PM I have another adsorber with just as little info, but I'm thinking about just cutting one open and replacing the carbon inside 27-Sep-20 01:25 PM A painful part about a absorber swap is the helium recharge... 27-Sep-20 01:25 PM I'll have to do that anyways, it's at ~2/3 of the recommended minimum charge 27-Sep-20 01:26 PM Let me know how it goes! 27-Sep-20 01:26 PM I might need to do it soon too, especially if I get that huge cryocooler from the Leybold cryopump 27-Sep-20 01:27 PM still have to figure out how I'll do that, since the fill port is actually on the high side 27-Sep-20 01:28 PM I think some specialized tools are required 27-Sep-20 01:28 PM http://www.clarkind.com/?product_cat=maintenance 27-Sep-20 01:28 PM I also have to build the watercooling loop 27-Sep-20 01:28 PM the fill port is just some SAE fitting 27-Sep-20 01:28 PM I also have some adapters for aeroquip, so maybe I can bodge Something for that 27-Sep-20 01:28 PM haven't put much thought into it yet 27-Sep-20 01:30 PM Huh what's the best way to adapt between different sizes of Aeroquip fittings? I may need to go from 1/2" to 3/4" 27-Sep-20 01:30 PM I was thinking this, but got a ridiculous quote: http://www.clarkind.com/?product=helium-bulkhead-union 27-Sep-20 01:31 PM Welder or adapter 27-Sep-20 01:31 PM $480 for one 27-Sep-20 01:31 PM If there's a cheap adaptor from Aeroquip helium fittings to something SAE, that'd be great 27-Sep-20 01:31 PM Which looks like basically what they're selling... 27-Sep-20 01:34 PM @GigaSquirrel for your water cooling needs I wonder if you could get away with an automotive radiator and fan given the sort of generous 80F max outlet temperature requirement. 27-Sep-20 01:34 PM That's what I'm using on mine 27-Sep-20 01:34 PM that's my plan ^^ 27-Sep-20 01:34 PM since this thing will be running in my basement I'm aiming for a rad that fits in my window 27-Sep-20 01:35 PM An air conditioner radiator is actually good enough on mine 27-Sep-20 01:35 PM also all the associated hardware + helium costs seem to be the downfall of most people's cryocooler dreams 27-Sep-20 01:35 PM https://hosewarehouse.com/products/5400-S2-12-Eaton-5400-Series-Low-Air-Inclusion-Refrigerant-Male-No-Adapter-Quick-Disconnect-Neoprene-Seal-with-Guardian-Seal-Plating https://hosewarehouse.com/products/5400-s2-8-eaton-5400-series-low-air-inclusion-refrigerant-male-no-adapter-quick-disconnect-neoprene-seal-with-guardian-seal-plating 27-Sep-20 01:35 PM I already have everything, I was just missing the compressor (and stuff for watercooling) 27-Sep-20 01:35 PM Heres the fittings by themselves $28 and $16 27-Sep-20 01:35 PM Oh you already have the stuff to connect up to do the filling and everything? 27-Sep-20 01:36 PM I'm positive you could do better than 480 27-Sep-20 01:36 PM Woops 27-Sep-20 01:36 PM Huh dyno doesn't censor the s-word anymore? 27-Sep-20 01:36 PM The gas regulator I already have wont work with helium so I have to get another one before also getting a helium cylinder 27-Sep-20 01:37 PM Oh you already have the stuff to connect up to do the filling and everything? @LRM I have enough adapters and stuff to fill it, I just haven't figured out how yet 27-Sep-20 01:37 PM oh interesting 27-Sep-20 01:37 PM I got a warning and there's a deletion message in the log, but it still stands there 27-Sep-20 01:37 PM huh 27-Sep-20 01:38 PM I think only you can see the deleted messages 27-Sep-20 01:38 PM @Beach&BoardFan Anyway thanks so much 27-Sep-20 01:38 PM yeah dyno is acting a bit weird atm 27-Sep-20 01:38 PM O was my links deleted? 27-Sep-20 01:39 PM You're good, I was a bit too enthusiastic when expressing my gratitude 27-Sep-20 01:55 PM I think I'm just going to get the adaptors to SAE AN/JIC fittings, they might come in handy in the future for absorber swap as well. Can get it done for ~$100 total probably 27-Sep-20 01:55 PM The one thing I'm not sure is how good SAE fittings are in sealing in helium 27-Sep-20 01:55 PM It seems these flare fittings are only used in charge lines 27-Sep-20 01:55 PM I haven't tried brazing in a long time, and don't have the equipment to do it 27-Sep-20 03:38 PM Good thread sealer 27-Sep-20 03:43 PM I was always advised not to use teflon tape on AN fittings, but then again I was not working with helium. I'll probably go with some paste thread sealant and still torque the AN fitting to their original spec 27-Sep-20 04:07 PM Yea if it has a flange dont, but any thread thats not brass, go for it 27-Sep-20 04:15 PM The reason given to me for not using teflon tape on aluminum AN fittings was that any lubricating material applied to the AN fitting could deform/damage the flared metal-to-metal seal 27-Sep-20 04:15 PM When you apply the correct amount of torque on the fitting 27-Sep-20 04:35 PM I've always had good luck with AN, and JIC fittings, swagelocks compression fittings are really the only thing I ever had problems with. I wouldnt worry too much using those fittings for helium, no matter what you do, you're going to have loss through diffusion. 28-Sep-20 01:03 PM @Applied_Ion I took your advice to use the larger, 400LPS pump for the 14" vacuum chamber, so I got this for the 1 meter vacuum chamber instead, it's 2200LPS I think. 28-Sep-20 01:03 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200928_125511-4C9ED.jpg 28-Sep-20 01:07 PM Nice! That's a massive turbo lol. Where did you get it? Do you know if it was pulled functioning? 28-Sep-20 01:45 PM @adammunich that's a funky looking carseat you got there for that toddler 28-Sep-20 01:59 PM that turbo would make a good emote 28-Sep-20 01:59 PM gah, nobody takes photos of them head-on 28-Sep-20 02:30 PM @Applied_Ion I got it from some person named Leo in San Jose, according to him it was rebuilt but never used for a job 28-Sep-20 02:31 PM $$$ 28-Sep-20 02:31 PM good luck with it 28-Sep-20 02:31 PM did it come with a controller? 28-Sep-20 02:31 PM It looks like it has its controller too but I don't have any documentation so that's probably the next step 28-Sep-20 02:31 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/received_749592485633515-853D5.jpeg 28-Sep-20 02:31 PM It looks suspiciously similar to this one so that might be a good start 28-Sep-20 02:31 PM Apparently the red jacket is a bake out heater 28-Sep-20 02:35 PM Yeah, that's a beast of a turbo. If it works you will pump down whatever you want in no time lol 28-Sep-20 02:35 PM I'll find out soon enough it only wants 208 single phase which I can cobble together with my auto transformer 28-Sep-20 02:35 PM But only 400 w seems strange to request 208 for that 28-Sep-20 02:37 PM that's often just cause the pump isn't popular enough to make a north american model 28-Sep-20 02:37 PM leybold do it too. 28-Sep-20 02:39 PM @adammunich What are you using as it's backing pump? 28-Sep-20 02:40 PM I have a 2 stage edwards that might work 28-Sep-20 02:40 PM It weighs some ungodly amount of kg 28-Sep-20 02:40 PM Oh it better be to back that monster of a turbo 28-Sep-20 02:40 PM I need to learn how to weld and get a fork lift at this rate 28-Sep-20 02:41 PM is the pfeiffer sealed against oil? 28-Sep-20 02:42 PM Wow these use ball bearings with circulating oil as coolant 28-Sep-20 02:42 PM Would be interesting to see how they're sealed 28-Sep-20 02:58 PM I think I found the manual https://www.ajvs.com/library/Pfeiffer_Vacuum_TPH_2201_Manual.pdf 28-Sep-20 02:58 PM pumping explosive gas qualifies as "improper use" 28-Sep-20 02:58 PM It looks like they use lubricating oil 28-Sep-20 03:02 PM Yeah you might need to check the roughing requirements. Bigger main pumps require bigger backing pumps 28-Sep-20 03:02 PM That would need a serious pump. 400 L/s turbo isn't bad to back. 2000 though is another story lol 28-Sep-20 03:03 PM "In event of sudden standstill, torques greater than 8960 Nm can arise" lol dayum 28-Sep-20 03:03 PM @adammunich The TPU 2200 uses a carboxylic polyester oil, that's what it says on the MSDS 28-Sep-20 03:03 PM Well bolt it down securely that's for sure 28-Sep-20 03:07 PM I am missing the "power pack unit" TPS600, i wonder what it does 28-Sep-20 03:07 PM my guess is it's a pfc 28-Sep-20 03:07 PM https://www.provac.com/products/pfeiffer-tps-600-turbo-pump-controllers only has 3 wires 28-Sep-20 03:07 PM oh it might literally just be a DC SMPS 28-Sep-20 03:07 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/s-l1600-3189C.png 28-Sep-20 03:11 PM Yep 28-Sep-20 03:11 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-75A28.png 28-Sep-20 03:11 PM well that's easy enough, this one wants 140VDC 28-Sep-20 03:12 PM But you have the actual controller right? TC 600? 28-Sep-20 03:12 PM yeah that is bolted on 28-Sep-20 03:12 PM i will need to figure out what pin is +, - and protective earth but the capacitors inside should tell me that 28-Sep-20 03:13 PM Pins should be numbered 28-Sep-20 03:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-0C924.png 28-Sep-20 03:16 PM hot damn 28-Sep-20 03:24 PM looks like it has no oil presently 28-Sep-20 03:24 PM Oil is not too expensive compared to the price of the pump 28-Sep-20 03:25 PM yeah but we're talking $600 of fomblin lol 28-Sep-20 03:25 PM https://www.ajvs.com/new/product_info.php?products_id=7246 28-Sep-20 03:25 PM This will last you a few oil changes for the turbo 28-Sep-20 03:26 PM That's not too unreasonable 28-Sep-20 03:26 PM Lots of warnings to not transport it filled with oil, probably assuming UPS drivers will make a mess 28-Sep-20 03:27 PM Don't fill this thing with fomblin... The oil is mostly there for heat transfer and fomblin is not designed for high speed bearings experiencing high load 28-Sep-20 03:27 PM Unless you're talking about your Edwards foreline pump 28-Sep-20 03:28 PM It says it is compatible but my desire to spend $600 on a chemical company is not 28-Sep-20 03:28 PM Unless you're talking about your Edwards foreline pump @Mason_Yu i filled that with cheap oil and it seems to be doing ok 28-Sep-20 03:28 PM Where does it say it's compatible with fomblin? 28-Sep-20 03:29 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screen_Shot_2020-09-28_at_3.29.19_PM-03CFA.png 28-Sep-20 03:29 PM I'm pretty sure fomblin is a PEP though and I am not a fan of PEPs, i will not buy a PEP even if the manual says to 28-Sep-20 03:30 PM Oh I see, well that's very pricey 28-Sep-20 03:30 PM Is your pump specially designed for use with the "F3" oil? 28-Sep-20 03:30 PM I could imagine that they might not have the same kind of bearings 28-Sep-20 03:33 PM It says f3 on a sticker, but it's not entirely clear if it means only f3 28-Sep-20 03:34 PM Hmm, I think from the wording of that excerpt you sent, it's very possible the bearings are not compatible with the TL 011 hydrocarbon oil 28-Sep-20 03:34 PM And that f3 oil might be some specially formulated magic elixir too, it's so expensive 28-Sep-20 03:34 PM It's like more than five times the price of regular fomblin 28-Sep-20 03:40 PM If it's a PEP, I don't want it and I'll have to dig into an alternative. 28-Sep-20 03:40 PM California already has so many problems with persistent pollution I don't want to be a contributor to it 28-Sep-20 03:40 PM You can still measure trichlorethylene come out of the ground in mountain view and Palo Alto 50 years later 28-Sep-20 03:57 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screenshot_20200928-155619_Drive-5913D.jpg 28-Sep-20 03:57 PM Oh lovely, toxic when cooked 28-Sep-20 03:57 PM So I wonder what the difference is between the F3 and TL pumps 28-Sep-20 03:58 PM Most likely bearing seal 28-Sep-20 03:58 PM you don't need much of a forevacuum pump for these turbos? 28-Sep-20 03:59 PM Oh you do 28-Sep-20 03:59 PM pressure x pumping speed = pressure x pumping speed 28-Sep-20 03:59 PM Especially ones like this without a drag stage 28-Sep-20 03:59 PM The minimum foreline pressure must be maintained for the turbo, and some foreline pumps don't work very well near the limit of their pressure rating 28-Sep-20 03:59 PM Most likely bearing seal @Mason_Yu that could either be easy or hard to modify depending on how it was done 28-Sep-20 04:00 PM Compression ratio of the turbo may not be high enough if you have a small foreline pump 28-Sep-20 04:00 PM Yeah there is a super wide range of fomblin oil grades, we don't know what grade this stuff is, and from that it's hard to find alternatives, especially if you add the requirement of it not being a persistent pollutant 28-Sep-20 04:01 PM it only needs 0.1 mbar? 28-Sep-20 04:01 PM I understand where you're coming from, but there are fomblin reclaiming services @adammunich 28-Sep-20 04:02 PM I wonder how clean those companies are with operations... I've seen enough industries to know that don't ask don't tell is typically the policy. 28-Sep-20 04:03 PM dinky RV12 maintaining 5E-2 torr = ~0.2 torr L / s -> 1E-4 torr in the chamber with that turbo 28-Sep-20 04:05 PM I also wonder what the difference is between F3 and regular PFPE oil, I have a suspicion that there's actually not that much difference and the people buying these pumps are being milked by the company. 28-Sep-20 04:08 PM @adammunich what edwards forevacuum pump do you have? 28-Sep-20 04:08 PM I don't remember I'll have to look it up when I get home. 28-Sep-20 04:08 PM It was also a Craigslist pump lol 28-Sep-20 04:08 PM what do you actually want to do with this chamber / pump? 28-Sep-20 04:09 PM I don't really know yet 28-Sep-20 04:09 PM I just have most of the parts now 28-Sep-20 04:09 PM The parts seem more useful together than separate 28-Sep-20 04:10 PM but just cause it's a big chamber doesn't mean you need a big pump 28-Sep-20 04:10 PM our biggest chamber has our smallest pump 28-Sep-20 04:10 PM It's true but I got a deal on this pump lol 28-Sep-20 04:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/eco-06-6-pfpe-vacuum-pump-oil-1_540x-F371A.jpg 28-Sep-20 04:12 PM @idmb So compression ratio of a turbopump is a function of the foreline pressure, yes, mass flow rate is always conserved, but with a higher foreline pressure the compression ratio would decrease quickly, and the pumping speed of the turbo pump would decrease quickly as well 28-Sep-20 04:12 PM "Eco" branding on a PEP, ugh... 28-Sep-20 04:12 PM https://groups.spa.umn.edu/zudovlab/manuals/vacuum/turbo_pump_operation.pdf 28-Sep-20 04:12 PM This is the key paragraph 28-Sep-20 04:12 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-6CC6A.png 28-Sep-20 04:13 PM I don't actually intend to use this pump right now or maybe even for a year or more, but it was an offer I couldn't refuse so I'll hold onto it for when the time comes 28-Sep-20 04:14 PM @idmb I'd like to use a big pump (my turbo has a ISO200 inlet) on a big chamber simply because it feels like a waste of pumping speed if I hook it up to a reducer right away 28-Sep-20 04:14 PM I know whatever I put in the chamber might not need that much pumping speed, but a big chamber also means reducer is not necessary, one less thing to worry about 28-Sep-20 04:16 PM it's gonna depend on the pump a lot 28-Sep-20 04:16 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-46106.png 28-Sep-20 04:17 PM Yeah, and Adam's pump doesn't have a drag stage to provide a flat out multiplication in compression ratio, which is why I think a bigger foreline pump is required 28-Sep-20 04:17 PM To consistently operate the pump in the constant pumping speed regime 28-Sep-20 04:17 PM Gonna pop the turbopump tech note from Varian in #resources 28-Sep-20 04:19 PM I guess required is the word 28-Sep-20 04:19 PM you'll lose a bunch of pumping speed, but... you won't care unless you're forcing a gas load to match it in the first place 28-Sep-20 04:21 PM Well if you don't have a big gas load then yes, you don't need a big foreline pump, nor do you need a big turbo 28-Sep-20 04:21 PM *absolutely massive gas load 28-Sep-20 04:22 PM You'd be surprised how much a few virtual leaks can contribute... Also differential pumping is a thing 28-Sep-20 04:22 PM I got my big turbo for differential pumping 28-Sep-20 04:22 PM On an admittedly tiny tube... 28-Sep-20 04:22 PM that's often when tiny turbos are most useful 28-Sep-20 04:24 PM Hmm? How is a tiny turbo more useful when you want to have as big of a gas load as possible? 28-Sep-20 04:24 PM differential pumping usually has a pretty small gas load on each stage 28-Sep-20 04:24 PM But then you have small apertures 28-Sep-20 04:24 PM Big aperture = big beam = more good 28-Sep-20 04:25 PM most setups will have subsequently smaller pumps 28-Sep-20 04:25 PM from source to target 28-Sep-20 04:26 PM That's not how they do it where I work... By far the biggest pumps (3x roots blower) are near the target, and near the source (which is itself at a significant pressure ~0.1 mBar) there are three 1600 L/s turbos, plus a range of smaller ones right after the beam is expanded 28-Sep-20 04:26 PM The problem is the beam is diverging after the source 28-Sep-20 04:26 PM So you want big apertures in differential pumping stages near the source, and smaller and smaller ones as you pinch the beam down to the target 28-Sep-20 04:26 PM Should be true for electron and ion beams 28-Sep-20 04:26 PM And well big apertures simply doesn't work in transitional flow regime 28-Sep-20 04:26 PM But in molecular flow, with a fairly long tube aperture, it's justifiable and the gas load increase from increasing aperture size can be compensated for by using big turbos 28-Sep-20 04:42 PM @adammunich If you really want to replace your bearing, you should ask these guys: https://alpinebearing.com/search-results/?fwp_bearing_type=turbo-pump 28-Sep-20 04:42 PM This is not all of the bearings they stock, and there are quite a few in there that are in the TPH line and use the Pfeiffer's TL 011 oil 28-Sep-20 04:42 PM https://alpinebearing.com/ball-bearings/alp103tph/ 28-Sep-20 04:42 PM Looks like they are all hybrid ceramic bearings in this line 28-Sep-20 04:42 PM It would not be a simple job to replace the bearing though, especially when the rotors are difficult to access in your pump's configuration 28-Sep-20 05:17 PM This really big chamber I have is probably not going to be the easiest to seal so the high pumping speed I bet will help 28-Sep-20 05:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/received_847698929096272-D2C78.jpeg 28-Sep-20 05:17 PM I mean I don't even know if it will actually seal yet 28-Sep-20 05:17 PM And for all I know it will collapse if I try to Pump It down 28-Sep-20 05:17 PM But it doesn't look like it's any less well-built than propane tanks so... 29-Sep-20 06:58 AM I mostly have no idea what I'm doing with lasers, but have been playing with laser-induced copper deposition lately using those cheapo "20W" 450nm diode lasers. Tried to replicate three different papers, with varying levels of success https://youtu.be/w3jV58_Vv24 - First uses a standard electroplating solution (but no electricity)... the laser induces localized heating which shifts the rest potential, which causes a voltage difference and a small electrolytic cell to form. This makes a copper film "electroplate" itself, depositing under the laser and etching everywhere else. Fun paper from the 80s, looks like IBM did a lot of followup work in this area for "microcircuit repair" and small feature metallization. Not very practical though so never really caught on - Second was laser-assisted plating of stainless. Sorta worked, sorta not. Jury's out on this one - Third is the best imo: special electrolyte solution lets laser irradiation locally precipitate copper ions directly onto glass. Pretty wild seeing metal directly deposited onto glass. Should, theoretically, work for any surface since it's a precipitation reaction unrelated to the glass itself. It's similar to autocatalytic reactions, but doesn't require a catalyst or sensitization of the substrate 29-Sep-20 06:58 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/gear-612AA.jpg 29-Sep-20 07:02 AM cooool! 29-Sep-20 07:09 AM I was pretty happy it worked out, wasn't expecting much given the low output of the laser 29-Sep-20 11:01 AM @polyfractal very cool, did you try etching or cleaning the halo around the last attempt? 29-Sep-20 11:01 AM I love the simple ingredient list 29-Sep-20 11:01 AM Do you think 405nm would work? 29-Sep-20 11:02 AM yeah that light yellow haze/halo around it wipes right off, i think it's reaction byproducts and probably some precipitated copper, but not well adhered 29-Sep-20 11:03 AM That's awesome 29-Sep-20 11:03 AM 405nm would probably work, but i'm far from a laser expert. Think it mostly boils down to having enough power, and not being blocked by the glass. unlike the first two papers which had to absorb on the metal, this just needs to make the solution hot right at the interface 29-Sep-20 11:05 AM You come off to me as a chemist 29-Sep-20 11:05 AM I'm over here like, seriously, glycerin OR EDTA??? 29-Sep-20 11:05 AM And you're just totally nonchalant 29-Sep-20 11:05 AM EDTA sounds cleaner at first thought 29-Sep-20 11:14 AM So if it's just localized electrolysis for the first two you should be able to do this with any metal that has a reasonable reduction potential yeah? 29-Sep-20 11:23 AM Not enough people do stuff with the temperature part of nernst-planck and its really cool to see it applied (especially in such a practical way). 29-Sep-20 11:23 AM I've been obsessed with this one, where they use the temp effect on flux to map temperature at nanoscale https://pubs.acs.org/doi/10.1021/acsnano.0c02798 29-Sep-20 11:23 AM but not something I'll be able to replicate at home lol 29-Sep-20 11:30 AM Doesn't seem impossible 29-Sep-20 11:30 AM Getting nanopipettes that small seems like the challenge 29-Sep-20 11:30 AM The pipettes I imaged a few weeks ago were at smallest like 250nm ish 29-Sep-20 11:32 AM well not with what I have currently lol 29-Sep-20 11:32 AM what are you using for pulling them? 29-Sep-20 11:32 AM just a normal laser puller? 29-Sep-20 11:37 AM @nmz787 haha, well to be fair I found a paper where they used glycerol (and other "polyol"s) so I had some help coming up with that 29-Sep-20 11:37 AM @mike crb I think so yeah! literature mentioned that it's been done with nickel, gold and a few other metals I forget. also interesting is with different electrolytes you get the reversed effect, etching under the laser and deposition elsewhere 29-Sep-20 11:37 AM woah that nanopipette thing looks neat 29-Sep-20 11:42 AM Very neat stuff, saw a talk by the same author recently. He has been using nanopipettes for 3d-printing of metals, and has gotten like 10 nm wide features. He's done some crazy work in that field 29-Sep-20 12:02 PM that's bananas 29-Sep-20 12:46 PM @mike crb I think it's a sutter instruments p97 29-Sep-20 12:46 PM No laser 29-Sep-20 12:46 PM Just dry air into a small area and a hot wire, some spring tensioners 29-Sep-20 12:51 PM oh gotcha. 250 nm really isn't too bad a lot of the SICM labs that I know aren't too terribly much smaller than that. Think most are using np's around 150 nm, except for some specialized work 29-Sep-20 01:51 PM i went down the rabbit hole reading about SICM. i wanna make one now 29-Sep-20 01:51 PM honestly looks like a pretty straightforward device... hardest thing is the positioning stage really (piezos or voice coils or similar) 29-Sep-20 01:51 PM i suppose measuring picoamps could be tricky too, at least for me 29-Sep-20 02:56 PM So far measuring picoamps hasn't been that crazy other than little tweaks here and there 29-Sep-20 02:56 PM LMP7721 has a good example schematic for their demo board 29-Sep-20 06:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200929_180438-85E7F.jpg 29-Sep-20 06:10 PM 3 cheers for static friction 29-Sep-20 06:33 PM @adammunich what edwards forevacuum pump do you have? @idmb So it actually doesn't have a sticker anymore 29-Sep-20 06:33 PM I have no idea 29-Sep-20 06:33 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200929_183251-00C64.jpg 29-Sep-20 06:36 PM hmm that looks quite small 29-Sep-20 06:37 PM It's /very/ heavy 29-Sep-20 06:37 PM How do the dimensions compare to an Edwards E2M2 ? 29-Sep-20 06:38 PM I'll have to check 29-Sep-20 06:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20200929_183719-F2F3F.jpg 29-Sep-20 06:38 PM So it turns out one of these gate valves is exactly the right one for mega turbo! 12" LF 29-Sep-20 06:38 PM 18.2kg 29-Sep-20 06:38 PM E1M5 is 16.8kg 29-Sep-20 07:44 PM Sort of looks like https://www.idealvac.com/Leybold-D4-D4A-Trivac-Rotary-Vane-Dual-Stage-Mechanical-Vacuum-Pump-Rebuilt-Refurbished/pp/P10356 29-Sep-20 07:44 PM https://images.app.goo.gl/Ay41Gc4q614nBC199 29-Sep-20 07:44 PM Other side looks quite similar 29-Sep-20 07:44 PM Even the handle 29-Sep-20 07:48 PM Missing the side port thing 29-Sep-20 07:48 PM oil monitor? 29-Sep-20 07:48 PM nvm 29-Sep-20 07:48 PM that's totally it 29-Sep-20 07:48 PM ultimate pressure of 1x10-4 Torr 29-Sep-20 07:48 PM If it works well that would be a nice pump. 29-Sep-20 08:41 PM Oh that might be it actually 29-Sep-20 08:41 PM Yeah that's it 29-Sep-20 08:41 PM This pump aerosolizes a lot of oil you need an output filter 29-Sep-20 09:29 PM Yeah, at the lab I sometimes work at they just had some foil cupping some paper towels 29-Sep-20 09:29 PM Mostly only vaporizes it when pumping a lot of air 29-Sep-20 09:29 PM Once at vac they seemed fine 29-Sep-20 09:39 PM we have it running to an exhaust 29-Sep-20 09:48 PM When I was using it (or a very similar model) I was lucky to be next to a fume hood, and I did end up turning that on after a while 29-Sep-20 09:48 PM In my garage I have my main pump connected to an exhaust that goes out through the wall 29-Sep-20 11:22 PM Just use a plastic bottle with holes in bottom and some old shirt stuffed inside 29-Sep-20 11:23 PM oh man 30-Sep-20 04:50 AM @nmz787 oh cool, thanks for the LMP7721 tip! did your lab build a SICM? 30-Sep-20 10:30 AM Not exactly, but I guess sort of. We're going after using nanopores for sample analysis... Kind of inverse SICM 30-Sep-20 10:31 AM yeah sicm with nanopipettes falls in nanopore category 30-Sep-20 10:31 AM just like... nanopores with spatial resolution 30-Sep-20 10:31 AM Currently debugging the firmware and software to get data streaming working without any data loss 30-Sep-20 10:31 AM Using a teensy 4.1 and ethernet, was trying Python for the software but now I'm not sure if it is performant enough 30-Sep-20 10:47 AM ah nifty. cool i might bug you with questions in the future as i turns out, someone down the road was selling a pipette puller, and i already have the materials on hand for a nm-scale linear stage for an optics project (linear servos with 10nm encoders, and piezo focusing element)... bolting a micropipette to it seemed reasonably doable if i can sort out the amplifier bit 30-Sep-20 10:54 AM @polyfractal if you need more reading for SICM look at Pat Unwin's papers. Probably the best in the world currently at it. https://www.annualreviews.org/doi/pdf/10.1146/annurev-anchem-062011-143203 also this is a good review especially for different kinds of feedback loops 30-Sep-20 10:54 AM Plus some of the technical info is kind of kept secret in a lot of papers, but you can base a lot of it on AFM, because theyre essentially the same 30-Sep-20 10:54 AM Except in SICM your feedback loop that keeps the pipette right above the surface is based on ion current instead of beam deflection 30-Sep-20 11:24 AM woo thanks for the review @mike crb! will give that a thorough reading, and look up Pat's papers 30-Sep-20 11:24 AM i imagine the devil is in the details, but fundamentally it all seems pretty straightforward. i imagine, after working out the cartesian mechanism, most of it boils down to low noise amplifier and enough filtering/smoothing to deal with the remaining noise, without smoothing it so much you mash the tip into the sample 30-Sep-20 11:32 AM yep, also it helps to have some modeling to get an idea of how your approach curves should look, based on the width of your pipette tip. if you ever want modeling stuff done let me know I can do some 30-Sep-20 11:35 AM awesome, thanks! one thing i was curious about: it should work with larger pipette tips right? Obviously worse resolution and probably behaves a bit different, but the overall procedure should still work 30-Sep-20 11:35 AM larger meaning like microns, rather than nanometers 30-Sep-20 11:59 AM I think so, you probably lose a LOT of info tho 30-Sep-20 11:59 AM @polyfractal how much are they asking for the puller? 30-Sep-20 12:06 PM $150 USD. it's an older manual vertical model, but has a modification to allow two-stage pulls 30-Sep-20 12:07 PM Oh that sounds quite reasonable 30-Sep-20 12:07 PM Did they know if it worked recently? 30-Sep-20 12:08 PM yeah supposedly it's in working order, decomissioned from the nearby university 30-Sep-20 12:08 PM I think the main thing is to have a dessicant in line with the air, assuming it has that 30-Sep-20 12:08 PM (seller had a bunch of electrophysiology gear for sale, think it was someone associated with the uni liquidating older equipment) 30-Sep-20 12:08 PM Just to keep things like the cooling rates consistent 30-Sep-20 12:08 PM What state are you in? 30-Sep-20 12:09 PM Vermont, not very often that i find things locally 30-Sep-20 12:09 PM noted on dessicant, thanks! 30-Sep-20 12:09 PM Ah, hehe, other side of the country from me 30-Sep-20 12:09 PM Someone in here recommended this, which I bought too 30-Sep-20 12:09 PM https://www.amazon.com/gp/aw/d/B0178G62PA 30-Sep-20 12:09 PM It's about the same size as the unit on the sutter instruments puller I've used a few times 30-Sep-20 12:14 PM ah nice, that's smart using RO equipment. cheap and common fittings 30-Sep-20 12:14 PM never pulled pipettes myself, but folks in my old lab did for patch recordings. sounds like quite the art to getting good pipettes 30-Sep-20 12:29 PM Once it's tuned, it's pretty mindless 30-Sep-20 12:29 PM At least for the one I used 30-Sep-20 12:30 PM yes it will still work with larger pipette, but resolution will go down (res ~1.5X pip opening), you're still blocking ion flow to pipette electrode though so it will still work 30-Sep-20 12:30 PM We never touched the settings except like once in 7 years or something, when the heater wire needed replaced 30-Sep-20 02:08 PM hah, well, perk of ordering something locally i guess. they just dropped it off instead of mailing it seems to function, solenoid works and filament heats up. no air cooling though, but I think i can rig something up easily enough using my shop air and a solenoid switch to activate it on the end of the pull 30-Sep-20 03:16 PM i see a lot of papers use KCl for the electrolyte...I'm assuming any Cl- containing electrolyte would work (for the Ag/AgCl electrodes)? 30-Sep-20 03:27 PM Yeh 30-Sep-20 03:27 PM KCl also generally the best for any aqueous echem though, and I think it has the least ion rectification too 30-Sep-20 03:27 PM Same size, electromobility 30-Sep-20 03:27 PM https://www.nature.com/articles/srep04005 modified nanopipette, but still some interesting stuff here about KCl rectification 30-Sep-20 03:27 PM @nmz787 you might be interested in that paper too, a ton of good references in the introduction for rectification across nanopores 30-Sep-20 03:27 PM We should probably move this to off topic lol 30-Sep-20 05:13 PM ++ 03-Oct-20 11:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201003_230230-72535.jpg 03-Oct-20 11:04 PM Inside Pfeiffer turbo driver 03-Oct-20 11:04 PM Uses strange german 4 pin connector 03-Oct-20 11:08 PM looks comparable to the leybold one I took apart recently 03-Oct-20 11:08 PM and by that I mean "stuffed full of stuff with some hefty heatsinking" 03-Oct-20 11:08 PM So why don't any of these have variable speed control 03-Oct-20 11:08 PM Everyone just uses a throttle valve instead 03-Oct-20 11:13 PM For... what? 03-Oct-20 11:15 PM Variable pumping speed 03-Oct-20 11:17 PM You... You always want more pumping speed... 03-Oct-20 11:17 PM That's like rule #1 in most circles 04-Oct-20 12:08 AM Not if you're trying to achieve a particular vapor pressure like in CVD? 04-Oct-20 12:12 AM yeah, it does make sense to have controllable pumping speed 04-Oct-20 12:12 AM but a turbos pumping speed doesn't rely on rotational speed, but on the area 04-Oct-20 12:12 AM the speed is only there to get the blades over the average velocity of the molecules to be pumped 04-Oct-20 12:12 AM and a throttle valve alters the area 04-Oct-20 12:14 AM I see 04-Oct-20 12:14 AM I'm happy to report, big chungus is operational 04-Oct-20 12:14 AM It starts after about 20 seconds of BIST 04-Oct-20 12:15 AM the video is just a songle frame and no sound 04-Oct-20 12:16 AM Hmmmmm 04-Oct-20 12:16 AM also running a tmp in air doesn't tell you anything about its functionality, you'll have to run it in vacuum to reach full speed 04-Oct-20 12:18 AM Judging by how well it's spinning I anticipate no problems 04-Oct-20 12:19 AM it's a good sign, yes 04-Oct-20 12:22 AM https://youtu.be/lNdxuBv-fUE 04-Oct-20 12:23 AM now the video works 04-Oct-20 12:23 AM yep, looks good 04-Oct-20 12:25 AM Next step here I guess is to fix the chungus LF valve for it 04-Oct-20 12:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201004_002519-4E9F4.jpg 04-Oct-20 12:25 AM I started on that today 04-Oct-20 12:26 AM oh that's always fun 04-Oct-20 12:28 AM This one hasn't been as bad as the conflat valve 04-Oct-20 12:28 AM It looks like it's mostly going to be a job for steel wool 04-Oct-20 12:40 AM a hard scotch brite pad might be less trouble to clean up when youre done than steel wool if you can get away with something a bit less aggressive 04-Oct-20 12:40 AM congrats on the turbo! 04-Oct-20 12:41 AM Yeah steel is already getting everywhere lol 04-Oct-20 12:42 AM I always end up with steel wool splinters for a week or so after from all the bits that somehow evade cleaning 04-Oct-20 12:42 AM Plastic bag + magnet is your new best friend if that valve is nonmagnetic 04-Oct-20 12:43 AM It's 304SS I think so yeah a magnet should work very well 04-Oct-20 12:43 AM This one should be simpler to fix I can just use some aggressive sanding since there's no knife edge like the other one, this should be easy 04-Oct-20 12:43 AM Although I think I did manage to get that one totally repaired, all I need are some retaining rings and I can put it back together 04-Oct-20 12:43 AM I'm waiting for my other flange to arrive so that I can put in the McMaster carr order for gasket and borosilicate window 04-Oct-20 12:43 AM It looks like they have borosilicate windows and gaskets that are exactly 10 in 04-Oct-20 12:43 AM So if the flange that I ordered was actually dimensioned properly it should just be a drop in solution for a viewport 04-Oct-20 12:43 AM After that I think all that's left are some gaskets and an 8" CF to LF160 adapter 04-Oct-20 12:43 AM (For the Alcatel 5400 turbo) 04-Oct-20 12:43 AM This vacuum stuff is really expensive but at least it doesn't go obsolete 04-Oct-20 05:37 AM Hey everyone ! Just wanted to share my sputtering setup, it's my first vacuum involved project, the learning curve is steep and still is but it has been great fun ! It's nowhere near as well made nor as cool as what I often see on this Discord but I am proud of it anyway 04-Oct-20 05:37 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Front-83B25.jpg 04-Oct-20 05:37 AM Here is the front with control panel and access to every command to the machine (most of them can be automated for repeatability) 04-Oct-20 05:37 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Bottom-C3D8C.jpg 04-Oct-20 05:37 AM The bottom side with the turbomolecular pump bus supply, mecanical pump, and HV supply 04-Oct-20 05:37 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Top-695CD.jpg 04-Oct-20 05:37 AM And top side with the turbomolecular pump, custom made controller, HV PSU, raspberry pi for automation, both pressure sensors, and the main custom made controller 04-Oct-20 05:37 AM Currently I am working on the last of the troubleshooting, improving and verifying every safety aspects, verifying grounding, and looking into why my bus capacitors are being charged without being connected.. spooky, then I hope some sputtering action will take place ! 04-Oct-20 07:09 AM Wow, that looks really well done! 04-Oct-20 07:09 AM now we want to see it glow and do its thing :P 04-Oct-20 07:11 AM That looks very neat! 04-Oct-20 07:11 AM And yeah, show us when you're finished! ^^ 04-Oct-20 07:18 AM Looks awesome! Not totally sure about the capacitors, but I've noticed some HV capacitors will just slowly fill up on their own, that's why you usually put like a 1M ohm resistor across the terminals to bleed them to zero 04-Oct-20 07:26 AM Thanks! Will do! 04-Oct-20 07:26 AM @ericdalgetty you are right it's probably what is happening, I have a 1,5Mohm resistor between the terminals though but it still charges to about 50V, capacitors are about 2uF total so I am expecting 15s to full discharge, but it is possible that they charge faster than they discharge and the resistor is too large (maybe broken?) 04-Oct-20 07:26 AM Also I need to shield more of the communications and power cables as everything is so close together 04-Oct-20 07:34 AM What is the max voltage you would like them to charge to? I would choose the smallest resistor that won't get hot in operation 04-Oct-20 07:54 AM Around 1kV, 1.5Mohm is probably too high of a value, although I will need a resistor that can withstand both the voltage and power 04-Oct-20 08:24 AM @adammunich you'd almost always use a leak valve to hit a targer pressure, because then you get to control what gas you're pumping in? I guess a throttle valve lets you lower your consumption, but realistically I imagine industry settings would tend to just pick the appropriate size turbo for their process ? I've never seen a throttle valve in academia. 04-Oct-20 08:24 AM @Epilogis that project looks very neat and tidy 04-Oct-20 09:27 AM Thanks a lot! 04-Oct-20 12:16 PM @idmb from all the semiconductor crap that I dug through, throttle valves apparently are the way people do things. They are mostly butterfly valves. 04-Oct-20 12:16 PM @Epilogis that's such a beautiful set-up good job. Make sure you put a plastic liner inside your bell jar or it's going to become opaque very soon. 04-Oct-20 12:16 PM For setups like this you can also use a small turbo-drag pump which has a slower pumping speed but won't fail catastrophically if you let in air. 04-Oct-20 12:31 PM @adammunich Thanks! interesting but wouldn't a plastic liner outgass a lot ? or is there a special material I could use ? I will remember the turbo-drag pump if the one I own experience rapid unexpected disassembly ty! 04-Oct-20 12:31 PM For the pressure your working at it'll be fine I think. you could also spray with polyurethane which would be easy to clean off and recoat later 04-Oct-20 12:31 PM Or PVA which is easier to solubilize 04-Oct-20 12:33 PM Spirit was super into pure drag pumps for the safety factor 04-Oct-20 12:36 PM The Alcatel 5010 can run full speed in air 04-Oct-20 12:37 PM This? https://www.idealvac.com/files/manualsII/Alcatel_MDP-5010_Turbo_Drag_Pump_Manual.pdf sounds like it overheats?... 04-Oct-20 12:37 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screen_Shot_2020-10-04_at_12.37.04_PM-9D61F.png 04-Oct-20 12:37 PM wild lol 04-Oct-20 12:37 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screen_Shot_2020-10-04_at_12.38.00_PM-702C7.png 04-Oct-20 12:38 PM Yes it will get hot but not crack its blades off 04-Oct-20 12:38 PM It's the perfect bell jar pump for students and newbies 04-Oct-20 12:38 PM wow the installation diagrams are nice 04-Oct-20 12:38 PM page 15/16 04-Oct-20 12:41 PM I have one that's 50,000 hours old and still works great 04-Oct-20 12:44 PM Heavy cycling is a lot harder on them than what we do 04-Oct-20 12:44 PM ours are basically on 24/7, the chinese one (kyky) has had two failures in 10 years (controller once, pump another time), the pfieffer has had one failure, and the edwards is still ticking 04-Oct-20 12:45 PM Okay thanks! I'll try to coat the bell jar and have a look at that drag pump 04-Oct-20 12:45 PM Yeah that's why for all my big turbos I have a gate valve I don't want to have to spin it up and spin it down a lot 04-Oct-20 12:45 PM Real talk - they live longer than grant cycles and in this world that's all that matters -_- 04-Oct-20 12:46 PM @Epilogis I think your pump's going to be fine as long as you don't break your bell jar 04-Oct-20 12:46 PM What I would be more concerned about is that jar doesn't have plexiglass around it 04-Oct-20 12:46 PM In the chance that it does break let me tell you you don't want to be around an explosion when there's glass flying 04-Oct-20 12:46 PM safety good 04-Oct-20 12:47 PM Even 1/8" polycarbonate will save you a trip to the ER 04-Oct-20 12:48 PM Indeed safety good, good thing there are plexiglass panels everywhere now due to covid 04-Oct-20 12:48 PM Or maybe acrylic I wonder 04-Oct-20 12:48 PM Acrylic would work but it has to be much thicker 04-Oct-20 12:49 PM Realistically even a plastic bag would do a lot for safety. Not enough, but a lot... Kinda like a whipple shield 04-Oct-20 12:49 PM plexiglass is acrylic? 04-Oct-20 12:50 PM plexiglass is acrylic? @idmb depends on who you talk to but, in this case you should probably use polycarbonate 04-Oct-20 12:50 PM When my friends and I do theatrical explosions the first thing we do is knock out all the glass windows before hand 04-Oct-20 12:51 PM I thought plexiglass was specifically acrylic though 04-Oct-20 12:51 PM but anyways yeah 04-Oct-20 12:51 PM It's a marketing term that people have chosen to interpret to be anything clear nowadays lol 05-Oct-20 11:21 AM yeah technically acrylic == pmma == plexiglass, and polycarbonate == lexan 05-Oct-20 11:21 AM easiest thing to do is get some of that safety film for glass and wrap the bell jar. keeps the shards in place if there is an implosion/explosion 05-Oct-20 11:21 AM in other news, a wild crate appears! 05-Oct-20 11:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/QqspK8iDGxWUH0y_Oyz0rvAVCsbdZ0IdzGr49JGbUe-CDB1F.png 05-Oct-20 11:21 AM vacuum tube furnace 05-Oct-20 11:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Ab_VciLLkWfbRKTbYBoL8SjSE8PGNFt8e_OwMoPtGY-B8DCD.png 05-Oct-20 11:21 AM they shipped with the tube in place, so it quite predictably shattered into a bunch of pieces. but there's was a spare in a well packaged cardboard tube so I think i'm ok. will wire it up and check out all the electronics this weekend, but physically the rest of it survived the journey well 05-Oct-20 11:29 AM Oh man that's awesome! 05-Oct-20 11:30 AM i'm super stoked! think it was a university liquidation and picked it up at a great price. honestly even if all the vacuum components don't work it was still a good price for the furnace itself. although I'm hopeful that's not the case 05-Oct-20 11:31 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-BB47E.png 05-Oct-20 11:31 AM OH MY GOD THAT'S WHAT THE RUBBER THINGS ARE FOR 05-Oct-20 11:31 AM we have a huge pile of them 05-Oct-20 11:31 AM but nobody has installed them on anything 05-Oct-20 11:32 AM Hah 05-Oct-20 11:32 AM what's this thing? 05-Oct-20 11:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-72AB0.png 05-Oct-20 11:44 AM Woah @polyfractal 05-Oct-20 11:44 AM That's quite a score 05-Oct-20 11:46 AM @idmb a compressed air tank, as it turns out. I originally thought it was a squirrel cage blower or something, but it's a 150psi tank. the air line goes to the control box, so I'm assuming there's some kind of pneumatic solenoid in there or something... havent' had a chance to pop it open to check 05-Oct-20 11:46 AM odd.. 05-Oct-20 11:46 AM yeah definitely 05-Oct-20 11:46 AM control box 05-Oct-20 11:46 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/OJGiQufKumfRwqogVPs4LFZv_akK7F51gYoULQ0YEU-4336F.png 05-Oct-20 11:46 AM i dunno why you'd need an air tank right on the machine, since most compressors have their own tank... 05-Oct-20 12:28 PM same reason you put a capacitor on a circuit board 05-Oct-20 09:17 PM What’s the Max temp in the furnace? 06-Oct-20 04:38 AM not entirely sure, it appears to be customized from the base model. the specs on the base are 1400C, but this has one is 8kW instead of 6kW. It also has a slightly large tube than stock, so the extra power might just be compensating for that. so probably 1400C, maybe a bit higher. 06-Oct-20 04:38 AM with full vacuum I think it derates to ~1200C, need a partial pressure to hit 1400 iirc 06-Oct-20 01:38 PM Yay, 13.25" flange that isn't stolen by FedEx 06-Oct-20 01:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201006_133507-A666D.jpg 06-Oct-20 01:40 PM congrats 07-Oct-20 12:45 AM what flange is that? Looks like the Ring of rotateable CF 07-Oct-20 12:59 AM It's a weld on 13.25CF to 10" pipe 07-Oct-20 12:59 AM The inner lip is 9.75" 07-Oct-20 12:59 AM I found a 10" glass disk and suitable o ring for it 07-Oct-20 12:59 AM So it will become a viewport soon 07-Oct-20 12:59 AM Ring of rotatable CF is what I first ordered but it got lost, and now FedEx says they never received my claim filling (bologna). 07-Oct-20 12:59 AM But I think I'll be pretty happy with this flange also 07-Oct-20 01:03 AM oh so this is the bottom side 07-Oct-20 01:03 AM and the curtting edge is on the other side 07-Oct-20 01:03 AM Yeah the pipe-side 07-Oct-20 01:03 AM I see 07-Oct-20 01:04 AM I still don't know how to retain the glass disk 07-Oct-20 01:04 AM The vacuum should do it of course but something to keep it there when there's no vacuum would be nice 07-Oct-20 01:04 AM Maybe silicone 07-Oct-20 01:05 AM silicone will not work 07-Oct-20 01:05 AM all the outgassing 07-Oct-20 01:05 AM CF viewports are metal to glass seals 07-Oct-20 01:05 AM iso / kf usually has an o-ring or two 07-Oct-20 01:05 AM most are held in by the o-ring 07-Oct-20 01:06 AM There would be a viton gasket between the silicone and the chamber. Silicone would just be for mechanically holding the glass so it doesn't fall out 07-Oct-20 01:17 AM What about drilling and tapping few holes on the outer surface and 3d printing some nice clamps? 07-Oct-20 01:38 AM Stainless steel tends to be a drag to tap into the threads almost always gall up 07-Oct-20 01:38 AM I was thinking about maybe laser cutting some kind of retainer over the existing holes might work, though 07-Oct-20 05:43 AM https://cdn.discordapp.com/attachments/713449275425554444/763380686651523122/IMG_20201007_144031.jpg Whoop whoop I got mail 07-Oct-20 05:43 AM now I gotta figure out if it works with regular quarzes 07-Oct-20 06:18 AM hopefully you can get it too, tho the actual qcm crystals/electrodes run fairly cheap (<$50) and have a decent lifetime so if you do have to use them I doubt you’d run through them that quickly 07-Oct-20 06:18 AM @nmz787 posted something a while back about open source qcm 07-Oct-20 06:20 AM oh, got a source for the crystals? 07-Oct-20 06:20 AM issue is that I'll need fairly thick films, 1-20 µm range 07-Oct-20 06:20 AM and I fear that they might mess up the crystal faster 07-Oct-20 08:26 AM torr-seal is the proper vacuum epoxy 07-Oct-20 08:26 AM for something that massive / with actual foces if your chamber isn't level and it's tilting away... I wouldn't use it though 07-Oct-20 10:12 AM @GigaSquirrel https://openqcm.com 07-Oct-20 10:12 AM that's what I used 07-Oct-20 10:12 AM their shop also provides those quartz disks 07-Oct-20 10:12 AM maybe not the cheapest source but they deliver small quantities 07-Oct-20 10:12 AM https://store.openqcm.com 07-Oct-20 10:17 AM torr-seal is the proper vacuum epoxy @idmb I was thinking epoxy is going to be too rigid as the o ring will have some flex to it 07-Oct-20 10:17 AM oh, got a source for the crystals? @GigaSquirrel why not just cut open a 32.768khz quartz can they are basically the same thing 07-Oct-20 10:19 AM @adammunich Can you get away with tack welding some threaded rod to the outer face and holding the glass in with that? 07-Oct-20 10:19 AM ah his qcm controller needs a clock quartz? 07-Oct-20 10:19 AM but clock quartzes are fork shaped, how does that work? 07-Oct-20 10:20 AM Another option if the metal is above the glass enough to would be to cut some grooves on the ID and fit a wire retainer into those 07-Oct-20 10:21 AM ah his qcm controller needs a clock quartz? @N00N not all quartzes are, the larger cans are often disks 07-Oct-20 10:21 AM yeah 07-Oct-20 10:21 AM I only know those 5MHz and 10MHz disks 07-Oct-20 10:21 AM for the 'standard' controllers 07-Oct-20 10:22 AM Those are also less than $1. since a crystal oscillator is basically the same thing as a thickness guage I bet it would work fabulously well 07-Oct-20 10:22 AM yeah 07-Oct-20 10:22 AM I opened a couple of those cans 07-Oct-20 10:22 AM but ended up using larger standard disks 07-Oct-20 10:22 AM since inside cheap XOs the electrodes have shtty surfaces 07-Oct-20 10:22 AM screen printed 07-Oct-20 10:22 AM the qcm ones are Cr/Au 07-Oct-20 10:22 AM the standard ones 07-Oct-20 10:22 AM expensive XOs also have good electrodes but they're not cheaper than QCM disks 07-Oct-20 10:22 AM + it's easy to destroy them if you open the can ... 07-Oct-20 10:22 AM and always wear goggles 07-Oct-20 10:22 AM but you could ofcourse remove the crppy screen printed electrodes and PVD good ones on it 07-Oct-20 10:22 AM tried that but wasn't worth it (for me) 07-Oct-20 10:22 AM @GigaSquirrel if you need only one for testing (preventing mis-buy a pack of 10) - could send ya 07-Oct-20 11:15 AM @GigaSquirrel why not just cut open a 32.768khz quartz can they are basically the same thing @adammunich because it needs a certain frequency and area as well methinks 07-Oct-20 11:15 AM @GigaSquirrel if you need only one for testing (preventing mis-buy a pack of 10) - could send ya @N00N That would be awesome! 07-Oct-20 11:15 AM No idea what freq my thingie wants tho 07-Oct-20 11:36 AM @GigaSquirrel the site @N00N posted is cheaper but if you need single this is the site I was thinking of https://qcm-sensors.com/product/8-mm-qcm-crystal/ 07-Oct-20 11:36 AM Probably 5 or 10 MHz that seems standard 07-Oct-20 11:36 AM Should have a range it measures over 07-Oct-20 11:36 AM And then just need one within that range 07-Oct-20 11:38 AM 80 bucks shipping to germany 07-Oct-20 11:40 AM oof 07-Oct-20 11:40 AM yeah 07-Oct-20 11:40 AM before I order anything I first want to figure out what I even need 07-Oct-20 11:41 AM Can you send a picture of the back of the device 07-Oct-20 11:41 AM literally just a bnc, power cord and fuse 07-Oct-20 11:41 AM no text or anything 07-Oct-20 11:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-FC4E8.png 07-Oct-20 11:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-8D25B.png 07-Oct-20 11:44 AM Seems it goes with their E5100 sputter coater 07-Oct-20 11:45 AM looks like it 07-Oct-20 11:48 AM no documents easily available on either lol. Can you find the frequency of the reference crystal? 07-Oct-20 11:50 AM that was 9.something MHz 07-Oct-20 11:50 AM oh nvm 5.5 MHz 07-Oct-20 12:34 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201007_212158-58654.jpg 07-Oct-20 12:34 PM also there's this that apparently goes on there 07-Oct-20 12:36 PM Do you have the crystal holder? 07-Oct-20 12:37 PM nope 07-Oct-20 12:39 PM Hm apparently the diameter of the recessed slot in the holder determines it, so for a 12.5 mm it is 5 MHz and for 14 mm it’s 6 MHz... so without that idk what to say. Could probably get away with either 07-Oct-20 12:43 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201007_214043-4B5C6.jpg 07-Oct-20 12:43 PM let's see if I can find info on that controller 07-Oct-20 12:43 PM oh it's just a counter 07-Oct-20 12:44 PM Do you have any friends with a profilimeter lol? 07-Oct-20 12:44 PM because I think either way, even if you had the right crystal you would still have to measure the film after deposition to calibrate density settings for your material. 07-Oct-20 12:46 PM I have a few with a surface roughness gauge if that helps? 07-Oct-20 12:47 PM Just have to deposit a very thick film hahaha 07-Oct-20 12:47 PM oh you mean deposit, measure actual thickness and then calibrate the thing by applying a factor to the density setting? 07-Oct-20 12:48 PM Yeah. So even on more recent ones you still have to do this. The SQM 160 that I’m familiar with just called this a tooling factor and was it’s own input, but on this one you’d just apply it to your density value that you used during you test deposition 07-Oct-20 12:49 PM what kind of error can I expect when I don't do that? 07-Oct-20 12:49 PM my current application needs a 14 µm Al film, won't matter much if I have 10 or 20% error 07-Oct-20 12:51 PM I think the factor when I’ve set it up was around 1.4 (instrument specific). So maybe a bit outside of your error range but not too much? 07-Oct-20 12:51 PM General rule that I’ve always been told for spin coat or deposition stuff is never trust qcm or resist thickness curve and always just do a step measurement 07-Oct-20 12:53 PM hmm ok 07-Oct-20 01:04 PM oh the guy I got it from might have one used crystal left over 07-Oct-20 01:19 PM nice! 07-Oct-20 01:47 PM oh the guy I got it from might have one used crystal left over @GigaSquirrel oh really? 07-Oct-20 01:48 PM and he's very willing to ship ot to me so I can compare it to off the shelf crystals for frquency generation 07-Oct-20 01:48 PM which will help him in the long term as well 07-Oct-20 01:49 PM Well i heard that the guy has an unlimited source for his own deporate monitor crystals 07-Oct-20 01:50 PM well then I bet he wouldn't mind one less 07-Oct-20 01:50 PM They are different types 10MHz 07-Oct-20 01:50 PM so he won't be able to use that leftover one anyways 07-Oct-20 01:50 PM But yeah i think the "guy" will send you the used one. 07-Oct-20 01:50 PM Or he will drop it from the roof 07-Oct-20 01:51 PM Thanks ❤️ 07-Oct-20 01:51 PM (for not dropping them, that is) 07-Oct-20 01:51 PM would make a terrible frisbee anyways 07-Oct-20 04:25 PM If shipping wouldn't be obviously insane, you could send a sample to me and I could just cut and image the side profile in my FIB 07-Oct-20 08:23 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201007_202045-66940.jpg 07-Oct-20 08:23 PM I swallowed my pride and bought someone's left over fomblin 07-Oct-20 08:23 PM So now the question is which one is closer to the mysterious F3, they unfortunately don't publish viscosity of F3 08-Oct-20 03:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201008_151156-2CB0D.jpg 08-Oct-20 03:13 PM Perfect fit, but the glass is damaged, will replace it. I guess McMaster shouldn't pack steel bolts in the same box, whoops. 08-Oct-20 03:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201008_151151-D7A92.jpg 08-Oct-20 03:13 PM It extends a little bit far, some kind of spacer/protection ring might be a good idea 08-Oct-20 03:19 PM I don't see any damage in your pics 08-Oct-20 03:21 PM hard to photograph but there is a gouge in the glass 08-Oct-20 03:21 PM probably not a good idea to heat pressurized, tempered glass with a surface defect 08-Oct-20 08:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201008_153040-9350F.jpg 08-Oct-20 08:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201008_154246-F8234.jpg 08-Oct-20 08:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201008_154411-5F7B7.jpg 08-Oct-20 08:52 PM The mechanism on this VAT valve is pretty neat. The ball bearings rest into dents when the valve is unsealed. When the valve is sealed, they roll out of the dents and widen the mechanism to push against the opposing valve body and seal the viton gasket. This is actuated by the same lever that raises the valve plate, at the end of its travel it causes the circular part to rotate and seal. 09-Oct-20 11:17 AM well the thickness monitor reacts to the outside world when connected to a 6 MHz crystal 09-Oct-20 11:17 AM but I have no way to determine how far its off 09-Oct-20 11:51 AM hmm maybe some sort of optical method? Do an optically thin deposition and measure transmittance? 09-Oct-20 11:53 AM I've just asked a friend with a surface roughness gauge what resolution he can achieve 09-Oct-20 11:53 AM one of those thingies that drag a needle over the sample, iirc well below µm resolution 09-Oct-20 11:53 AM ok so a profilimeter essentially 09-Oct-20 11:53 AM if it’s below um then you should be fine just do a thicker deposition 09-Oct-20 11:53 AM I’d say just try a 14 um deposition since that’s what you’re going for anyways 09-Oct-20 11:54 AM good point 09-Oct-20 11:54 AM and then just mask with thermal tape 09-Oct-20 11:55 AM gotta see if I can zero that much mass 09-Oct-20 11:55 AM if not I'll use a shutter few mm away from the crystal, should be fine enough of an edge 09-Oct-20 11:55 AM eh, just checked my numbers, I meant 1.4 µm 09-Oct-20 11:55 AM <1.5 µm eq. Si 09-Oct-20 11:55 AM that sound be ~1.5 µm Al 09-Oct-20 12:10 PM Beam doping cells! 09-Oct-20 12:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-E7D92.jpg 09-Oct-20 12:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-9114F.jpg 09-Oct-20 12:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-44A45.jpg 09-Oct-20 12:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image3-A29EA.jpg 09-Oct-20 12:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image4-4B3C9.jpg 09-Oct-20 12:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image5-48B00.jpg 09-Oct-20 12:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image6-C6EE3.jpg 09-Oct-20 12:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image7-E7F16.jpg 09-Oct-20 12:10 PM Made to be super simple to make because shop was sooooo slow 09-Oct-20 12:11 PM what's beam doping? Like ion implantation? 09-Oct-20 12:11 PM Which of course makes the design more complicated and worse 09-Oct-20 12:11 PM Uh, you have a beam of droplets going through and by having a pressure of your dopant gas in the cell, the droplets collect some of the dopant 09-Oct-20 12:12 PM Made to be simple but the design is more complicated? How complicated can it get? 09-Oct-20 12:12 PM oh, nothing semiconductor related? 09-Oct-20 12:14 PM Well it’s a bunch of waterjet pieces that bolt together 09-Oct-20 12:14 PM Rather than machined parts 09-Oct-20 12:14 PM What's the droplet and the dopant? 09-Oct-20 12:15 PM If you look at how the posts attach to the flange you’ll see it’s super simple to make but super over complicated mechanically 09-Oct-20 12:15 PM Helium droplets 09-Oct-20 12:15 PM Dopant = any gas you want to dope droplets with 09-Oct-20 12:15 PM Ah, and you spin these gas molecules inside the helium droplet 09-Oct-20 12:15 PM right, I forgot you did the nanodroplet stuff and had my mind set on semiconductor doping 09-Oct-20 12:16 PM Surprisingly simple way to dope it, I would've thought you need to do this before/in your nozzle 09-Oct-20 12:16 PM There are many ways 09-Oct-20 12:16 PM This way gives a nice control over how many dopants per molecule 09-Oct-20 12:16 PM Without the risk of freezing stuff in your nozzle 09-Oct-20 12:17 PM Speaking of nice machining: 09-Oct-20 12:17 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201007_194703-C2DFD.png 09-Oct-20 12:17 PM This is probably one of the most complicated piece of CNC machining I've ever held 09-Oct-20 12:18 PM Now that I’ve tested it goes together, I have to clean it though 09-Oct-20 12:18 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201007_201803-591FC.png 09-Oct-20 12:18 PM Is that just a fancy heat sink? 09-Oct-20 12:19 PM A heat sink plus holder for the stirling cooler compressor, plus a lot of other things 09-Oct-20 12:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201007_213156-4F6A8.png 09-Oct-20 12:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201007_224343-85850.png 09-Oct-20 12:19 PM The entire body is machined from two billets 09-Oct-20 12:19 PM Even the board holder is really complicated 09-Oct-20 12:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201007_220632-47704.png 09-Oct-20 12:19 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201008_192436-784F3.jpg 09-Oct-20 12:21 PM Nice 09-Oct-20 12:21 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201008_190713-3B8AB.jpg 09-Oct-20 12:21 PM There are 4 ADCs on this digitizer board, but after cooling down the detector, there's no real activity on the FPGA 09-Oct-20 12:21 PM It has a small ATMega on the back side, and high speed serial communication interface chips 09-Oct-20 12:21 PM All milspec connectors on this thing, pretty much every connector except the Deutsch has epoxy potting on the back 09-Oct-20 12:21 PM A pain to RE and trace 09-Oct-20 12:21 PM Probably will ditch this digitizer board and go with a Red Pitaya or perhaps another Zynq based solution 09-Oct-20 12:21 PM I don't know how/if I can dump the flash on the MCU, and it certainly seems it needs an external controller to talk to it before it starts biasing the detector and tell the FPGA and ADC to go to work 09-Oct-20 12:21 PM Looks like this was made in late 2005/early 2006. Certainly spared absolutely no expense anywhere on this thing 09-Oct-20 12:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201009_143542-57E60.jpg 09-Oct-20 12:36 PM Big aperture on the cryostat 09-Oct-20 06:57 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201009_185613-F9352.jpg 09-Oct-20 06:57 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201009_185602-3A1D9.jpg 09-Oct-20 06:57 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201009_185549-AF2FE.jpg 09-Oct-20 06:57 PM x y z & theta, with high current, thermocouple, and liquid feed throughs 09-Oct-20 06:59 PM You afraid that there's gona be a ketchup shortage? 09-Oct-20 06:59 PM Also, the shiny manipulator(?) looks very nice 09-Oct-20 07:01 PM You afraid that there's gona be a ketchup shortage? @rfs it was $1 per 8 at the grocery store lol 09-Oct-20 07:03 PM That looks similar to the one I said we have but won’t use because it’s too fancy to be useful 09-Oct-20 07:04 PM lol 09-Oct-20 07:05 PM I don't actually know how to use the ln2 feed throughs, I guess I can have my cryo cooler make ln2 and pump it through 09-Oct-20 07:14 PM I ordered some ferro-titanium for this anode I’m making. I want to cold-work it into a 6mm flat disc. I wasn’t expecting it to be this stunning though. 09-Oct-20 07:14 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-782EC.jpg 09-Oct-20 07:26 PM titanium oxidation is beautiful 09-Oct-20 07:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/EXm5ZFpWkAY9JxV-F677A.png 09-Oct-20 07:26 PM if you mask certain regions you can paint with it haha 09-Oct-20 09:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201009_212733-BDAC0.jpg 09-Oct-20 09:28 PM The gasket on the pipe feed through must not be replaceable huh 09-Oct-20 09:28 PM At least not copper, maybe you could get a rubber one to stretch enough 09-Oct-20 09:31 PM which? 09-Oct-20 09:33 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201009_212733-1C531.jpg 09-Oct-20 09:33 PM Seems like a really dumb manufacturing choice 09-Oct-20 09:34 PM the stuff on the right is attached to the flange on the left? 09-Oct-20 09:34 PM Yea 09-Oct-20 09:34 PM isn't it a spiralled pair of tubes ? 09-Oct-20 09:34 PM do you think it's welded in place? 09-Oct-20 09:34 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201009_213335-44F80.jpg 09-Oct-20 09:34 PM Not welded but attached to this 09-Oct-20 09:34 PM Only a rubber gasket could make it over that 09-Oct-20 09:35 PM Huh, so is that a liquid nitrogen reervoir? 09-Oct-20 09:35 PM Yeah it appears so 09-Oct-20 09:35 PM the flange doesn't look conflat though 09-Oct-20 09:35 PM so it's probably rubber anyways? 09-Oct-20 09:36 PM It's conflat, I only noticed after I removed it. I reseated it in the same place, presumably it's still sealed... 09-Oct-20 09:38 PM Ha. They can sometimes seal ok again, if it wasn't overtightened it will almost definitely seal a second time 09-Oct-20 09:38 PM after a couple times though they won't seal any decent amount though. 09-Oct-20 09:39 PM I should probably just get a rubber seal for it 09-Oct-20 09:39 PM It needs to be flexible though to fit over that chamber, not sure viton will work. 09-Oct-20 09:39 PM Yeah no, that would be a 50% stretch. Hm. 09-Oct-20 09:50 PM I suspect indium wire would work really well here 09-Oct-20 09:50 PM Wrap loops where the gasket used to be and have it fill the gap, it's much more malleable than copper 09-Oct-20 09:58 PM more malleable to a fault 09-Oct-20 09:58 PM easy to compress so much that you're metal to metal with no seal 09-Oct-20 10:10 PM In that case you could put it over the existing copper and seal it up that way 09-Oct-20 10:10 PM Although at that point you can just use tin/lead solder 09-Oct-20 10:26 PM Hm, that actually sounds very reasonable I'll try that 09-Oct-20 11:09 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201009_230754-73818.jpg 09-Oct-20 11:09 PM Now there's a lot of soft metal to bite into :-) 09-Oct-20 11:33 PM Tightening those screws was very satisfying I think this might be a viable way to reuse your gaskets 09-Oct-20 11:33 PM Although at this point I am certainly in the camp of, use viton gaskets where possible and throw a bigger pump at it all. 10-Oct-20 12:23 AM apparently digikey has QCM crystals for afforable money 10-Oct-20 12:23 AM https://www.digikey.com/en/products/filter/specialized-sensors/561?s=N4IgTCBcDaIIoGECyACAzgUwHZoPYCcQBdAXyA 10-Oct-20 01:36 AM @GigaSquirrel this one is literally an oscillator without the can lol https://www.digikey.com/en/products/detail/ndk-america-inc/PSA-SL-3001T-30-834MHZ/4141866 10-Oct-20 04:57 AM Wow looks like they have all the major brand design/frequency combos right too 12-Oct-20 07:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-02ADF.jpg 12-Oct-20 07:21 AM After wire brushing and sand blasting.... 12-Oct-20 07:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-9C078.jpg 12-Oct-20 07:21 AM Pretty powder. Red, because it goes faster. 12-Oct-20 07:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-2E6DC.jpg 12-Oct-20 07:21 AM Baking time.... 12-Oct-20 07:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-E7AFA.jpg 12-Oct-20 07:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-F6880.jpg 12-Oct-20 07:21 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-B9A66.jpg 12-Oct-20 07:21 AM Looks better than new. 12-Oct-20 07:29 AM on dang that looks like proper production quality 12-Oct-20 07:58 AM Thanks! 12-Oct-20 07:58 AM I’m planning on finishing the rest today. And studying linear algebra while they cook in the oven. 12-Oct-20 01:25 PM scooter? 12-Oct-20 04:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201012_160443-05A96.jpg 12-Oct-20 04:06 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201012_160455-14EF6.jpg 12-Oct-20 04:06 PM Wine boxes are so useful 12-Oct-20 07:36 PM Sweet 12-Oct-20 09:18 PM @adammunich nope, it’s an aircraft tug. 12-Oct-20 09:18 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-AA4C2.jpg 12-Oct-20 09:18 PM Doing smoke chrome for the body. 12-Oct-20 09:18 PM A big tire sits in the rectangular hole bolted to the axle. The gas engine goes in the upper left hole. There’s a very simple clutch, just a belt with an idler that can be tensioned, under this. The transmission bolts to the hole in the lower center, which lets you select forward, reverse, or neutral. The transmission drives a chain which drives the tire. The piece of bent sheet metal is the chain guard. The right arm that grips the aircraft wheel is permanently locked in place. The left arm is not attached, and is the rightmost part on the table. I had to rebuild the hinge on it by welding a tubular sleeve in place. 13-Oct-20 06:59 PM Sweet. In my new neighborhood they use golf carts as tugs. It’s a residential air park so planes and vehicles can share the road. The streets are very very wide. 13-Oct-20 08:48 PM Anyone here familiar with AVR assembly? I dumped the eeprom and flash on the ATmega163L MCU on the FLIR camera, but for sure there is a huge learning curve on AVR assembly and making sense of what's going on. The chip right now is doing nothing, I think it must enable clock on the FPGA for things to start happening. The eeprom is pretty much empty and probably contains some calibration values only. Here are the raw binaries 13-Oct-20 08:48 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/eeprom-C2B59.bin 13-Oct-20 08:48 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/flash-EFEAC.bin 13-Oct-20 08:48 PM All I want to know is that what will make it step out of what appears to be an infinite loop, whether it'd be an external serial command, or simply from one of the pins being pulled low or high 13-Oct-20 09:48 PM Look for jumps 13-Oct-20 09:48 PM Is this one of those FPga that has built-in memory or is there like an external flash chip that sends a byte stream to it 13-Oct-20 09:48 PM It's a Virtex XCV150 13-Oct-20 09:48 PM The INIT pin is pulled high, but nothing is happening on the FPGA itself 13-Oct-20 09:48 PM Probably missing clock enable? 13-Oct-20 09:49 PM What I'm saying is that some fpgas are not non-volatile and you have to load in everything at boot 13-Oct-20 09:50 PM IdaPRO seems to support AVR disassembly 13-Oct-20 09:50 PM This also just came up https://onlinedisassembler.com/odaweb/ 13-Oct-20 09:51 PM I'm using Ghidra, I can already see some things after initial disassembly, but things are not clear... For example: 13-Oct-20 09:51 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-5FF2F.png 13-Oct-20 09:51 PM Well presumably it's out of reset 13-Oct-20 09:51 PM That's usually reserved for basic configuration, like clocks and GPIO states 13-Oct-20 09:53 PM Zero filling the RAM and stuff too 13-Oct-20 09:53 PM @adammunich That's what I'm after, to see if the FPGA has actually been configured or not. This thing can run on 1-4 ADCs, I presume the MCU must configure it via serial somehow, but it's doing nothing 13-Oct-20 09:53 PM Except giving out a 4 Hz square wave on one of the timers 13-Oct-20 09:54 PM Well if you are configuring the fpga from the microcontroller there should be a big block of something in there that's not disassembleable 13-Oct-20 09:54 PM Something that's not AVR 13-Oct-20 09:55 PM @Mason_Yu post the next screenshot, or copy the annotated output to pastebin for us to see 13-Oct-20 09:55 PM It could be setting up input capture on one of the pins 13-Oct-20 09:55 PM Which is hooked to an interrupt service routine 13-Oct-20 09:55 PM Have you looked up those register names? 13-Oct-20 09:55 PM UCSR1C appears to be UART settings 13-Oct-20 09:55 PM I'd figure out the associated pin and connect a terminal session up to it 13-Oct-20 09:55 PM I'm guessing the Zlo and Zhi are registers that those functions are using as global variables 13-Oct-20 10:02 PM Yep, you're right, those are registers for UART communication according to the memory I/O map, but I suspect either this is nothing that out of the ordinary and it's just a usual routine to set up the MCU when powered on, or it's basically waiting for serial command input into those registers 13-Oct-20 10:02 PM There's a lot there in flash.bin, I don't know how to paste all the decompiled code from Ghidra onto pastebin 13-Oct-20 10:02 PM One thing I noticed also is that interrupt 1 is pulled high, and it seems to be setting a flag of some sort? 13-Oct-20 10:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-87178.png 13-Oct-20 10:02 PM If you have Ghidra also, decompiling is a one click affair, and there are definitely some blocks of code that seems pretty interesting. @adammunich There are large blocks of code in there that's not AVR, it might be FPGA configuration, but there's no way to understand that 13-Oct-20 10:27 PM Here are the two functions within reset that seems interesting, it seems to be checking the values in the UART registers against some pattern in a while true loop 13-Oct-20 10:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-BCAF8.png 13-Oct-20 10:27 PM There's this too, right before the end of reset, calling a lot of stuff, some of which has code that can't be decompiled, this might be setting up the FPGA? https://pastebin.pl/view/63285833 13-Oct-20 10:36 PM Hard to tell exactly what it's doing and where it's getting stuck 13-Oct-20 10:48 PM Upon further inspection, I think it is indeed waiting for UART data, probably to know the camera window size and location definition, the number of outputs to use on the ROIC, and then it will generate a bitstream and program the FPGA 13-Oct-20 11:05 PM if you can figure out what the stdlib functions like snprinf look like that can unlock some ideas 13-Oct-20 11:05 PM also, does this bin have debug symbols? maybe you can attach openocd and step through it 13-Oct-20 11:12 PM It's tough since the memory I/O addresses are not exactly the same as that listed in the datasheet, it looks like AVR does some sort of memory block offset, like what's shown here: https://www.youtube.com/watch?v=D0VKuZuuvW8&ab_channel=LiveOverflow 13-Oct-20 11:12 PM AVR memories are strange 13-Oct-20 11:12 PM I don't think there is any debug symbols... but I'm a noob with Ghidra so it might not have loaded it properly 13-Oct-20 11:13 PM i'm pretty amazed they left the flash unlocked you may still be able to step through it with the debugger 13-Oct-20 11:15 PM Yeah... Trying to find some emulator that will do it without having to go and send serial commands to the chip itself then guess what it is doing. They probably do have a programming lock on the flash, but that doesn't stop me from dumping it 13-Oct-20 11:15 PM There are a few options but most of them take assembled source code. simacr doesn't but ATmega 163 is not supported natively 13-Oct-20 11:16 PM see if theres some way to use GDB with a disassembler 13-Oct-20 11:18 PM I think the most valuable resource on avr specific emulators is that they know these weird memory address offsets and so on that's specific to an AVR chip, that's really a problem when trying to make sense of this 13-Oct-20 11:18 PM I'm not sure if GDB can be made to take that into account 13-Oct-20 11:21 PM ask sudo-discuss https://sudoroom.org/lists/listinfo/sudo-discuss 13-Oct-20 11:29 PM https://www.systutorials.com/docs/linux/man/1-avr-gdb/ 14-Oct-20 02:02 AM The first UART functions with loops appear to be checking for the null string terminator, i.e. and end of line 14-Oct-20 02:02 AM It's Little odd it's not a newline or carriage return, but the UART hardware might be taking care of the terminator 14-Oct-20 02:02 AM I'd look later in the code, to look for buffer processing stuff 14-Oct-20 07:43 AM It's Little odd it's not a newline or carriage return, but the UART hardware might be taking care of the terminator @nmz787 I don't get that. The UART hardware basically only shifts data from the RX pin into a shift register and shifts out data to the TX pin. If a newline is received, only a newline will apear in the uart data register. So I don't see any way in which the UART hardware would do something about a terminator character 14-Oct-20 11:22 AM Eh, hardware can have all sorts of features... I just haven't looked at that peripheral in detail so was just speaking off the cuff. In retrospect there probably just isn't newlines and the data expected has some other delimiter/boundaries 14-Oct-20 01:58 PM There's no end of line or any terminator character handling on the hardware of this chip. Just simple 10-bit shift register with an I/O data register. I was super confused by the decompiler until I realized Ghidra is using the wrong memory map for its AVR decompiler... It's not entirely wrong but wrong to some extent, the memory offset might be messing it up. By referencing the I/O memory map in the datasheet, I was able to find functions that sets the baud rate and so on 14-Oct-20 01:58 PM Still a lot of work that needs to be done though 14-Oct-20 02:09 PM Just going through and making sure every I/O address is referenced correctly, and then trace the functions under reset until I get somewhere. There is a very complicated function that might be main(). I also found the pins that must be programming the FPGA from the chip, and registers related to those pins would be interesting to look at 14-Oct-20 05:32 PM Is there any non-volatile storage on board in addition to that flashchip and aver? 14-Oct-20 05:32 PM And the FPGA's datasheet should reveal the methods it can use to ingest the bitstream on startup. 14-Oct-20 09:13 PM Yes, there is actually a serial PROM for the FPGA, however, I think the MCU still has to command program and initiation of the serial configuration sequence. By probing the configuration mode pins, I know the FPGA will configure itself using master serial mode, which means it will read in the configuration data from the PROM when commanded to do so. The sequence is shown in this flow chart: 14-Oct-20 09:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-985C9.png 14-Oct-20 09:13 PM The program pin is an input that initiates the configuration sequence when pulled low: 14-Oct-20 09:13 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-DC173.png 14-Oct-20 09:13 PM But I'm not seeing it being pulled low 14-Oct-20 09:28 PM The datasheet for the FPGA indicates that in master-serial mode, there is a pin CF that can be used to program the FPGA. This seems to be only possible with a JTAG config command though 14-Oct-20 09:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-1F5FA.png 14-Oct-20 09:28 PM So I guess the FPGA must have self-configured when it powers up, unless the rise time on the power supply is not fast enough 14-Oct-20 10:32 PM Nope, the power supply actually doesn't have a fast enough risetime, 6 ms compared to the 200 us requirement, it should not have gone through power on reset properly, yet I do see data being sent to the FPGA from the PROM... 14-Oct-20 10:32 PM There is a 20 ms delay after power on before a 50 ms burst of data is sent to the FPGA, and I think that means the FPGA is configured. 15-Oct-20 01:58 PM Since @GigaSquirrel brought it up a while back, what is wrong with this picture? 15-Oct-20 01:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-EF8CE.jpg 15-Oct-20 02:02 PM no hole in the bottom? 15-Oct-20 02:02 PM nowhere close to the shower that is, so this would spread whatever you're trying to wash off on the floor 15-Oct-20 02:05 PM But that'd at least be less emergency than before? However that reminds me of a restroom in a newly built public building which was built with the floor's drain being the most elevated part of the floor facepalm 15-Oct-20 02:05 PM same goes for those ledges on the wall 15-Oct-20 02:14 PM any hints @funranium ? ^^ 15-Oct-20 02:14 PM because I don't really remember what you think I brought up 15-Oct-20 02:18 PM a very unlikely answer to @funranium 's question could be that there is no mirror on the wall with the sink. It'd be very useful for an injured person to be able to inspect him/herself 15-Oct-20 03:02 PM No hole in the bottom isn't actually an issue. You have to remodel the building if it actually gets used, but bean counters have shown that it's generally cheaper than installing the proper water tanks you'd need. I don't have great depth perception to see, but I'm guessing it's the obvious and that the eyewash station is blocking you from doing the appropriate cleansing in the shower 15-Oct-20 03:02 PM At least all the ones I've seen have the safety shower to the side of the eyewash rather than what we have here 15-Oct-20 03:02 PM Also something seems like it might be off with the eyewash valve, but not sure there 15-Oct-20 03:08 PM No drain is the winner. Just a guaranteed flood if you ever use the eyewash or emergency shower. 15-Oct-20 03:08 PM Well, don't tell my school that because they definitely chose to go with the remodeling choice for the new teaching labs...and they're like 3 years old and they've already had to do it 15-Oct-20 03:08 PM So I don't really believe their decision, but they did it 15-Oct-20 03:08 PM They also had an incident in organic lab 5 years ago 15-Oct-20 03:40 PM get one of those toy sandboxes and fill with cat litter i guess 15-Oct-20 04:18 PM yay 15-Oct-20 05:27 PM oh 15-Oct-20 05:27 PM @funranium none of them here have drains 15-Oct-20 06:22 PM The eyewash station, in theory, has a drain. In practice, very little of that water goes into the "sink". I totally recommend everyone take one for a spin now just for the experience. Bring a mop and bucket so that the janitorial people don't hate you. 15-Oct-20 06:57 PM There used to be a power bar under ours 15-Oct-20 06:57 PM Fixed that. 15-Oct-20 06:58 PM .... ...your university needs a lot of help 15-Oct-20 07:01 PM Still haven’t got a response from the safety people 15-Oct-20 07:01 PM I would have thought any question like that would be high priority because they’d have to assume no response = we we’ll do it without a response? 15-Oct-20 07:05 PM All but one eyewash I'm by with any regularity is in an actual sink 15-Oct-20 07:05 PM Though yeah, I'm pretty sure the no drain is just a mistake. A safety shower will flood the literal entire building 15-Oct-20 07:07 PM I know of four though 15-Oct-20 07:10 PM I'm by 3ish usually. The wetlab one points towards the sink. The dry lab one is your typical standalone eye wash station. The teaching labs all have them in the sink 15-Oct-20 07:13 PM well so every eyewash here has a shower above it 15-Oct-20 07:14 PM Ours are slightly decoupled 15-Oct-20 07:14 PM I'm afraid that my career has shown the drainless shower and the eyewash with a drain that just dumps onto the floor are depressingly common all over the world. 15-Oct-20 07:14 PM my google says no drain used to be normal ? 15-Oct-20 07:14 PM Well, the stand alone ones aren't 15-Oct-20 07:14 PM building is like 40 years old 15-Oct-20 07:15 PM No drain showers are still made in the modern day on purpose 15-Oct-20 07:15 PM Though our building from the 50s has drains 15-Oct-20 08:13 PM @funranium if you think "checkmark compliance" is bad there you would be appalled to spend any time in the shipbuilding or breaking industry 15-Oct-20 08:13 PM My time as a longshoreman was enlightening to say to say the least, about how people treat compliance in practice 15-Oct-20 08:35 PM I found some good #show-and-tell photos today 15-Oct-20 08:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/420-256-D2F36.png 15-Oct-20 08:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/987-988-max-57625.png 15-Oct-20 08:35 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/375-256-44DE8.jpg 15-Oct-20 08:35 PM This is an x-ray machine I designed and built for a defunct company, it can fit in your backpack for use in the field. 15-Oct-20 08:35 PM If anyone wants to make one or further its development, I can post the design files. 15-Oct-20 08:35 PM I don't think the particular model of x-ray tube is still in production but it would be straightforward to change it over to something else. 15-Oct-20 08:50 PM Please don't. Laser hobbyist builds and distribution are a lot more open and free. X-ray builds, particularly easily portable ones, are DEEPLY frowned upon by regulatory authorities. 15-Oct-20 09:04 PM I haven't posted it publicly because you're right, there are lots of people who would do stupid things but I would release it in a controlled way to someone who is competent and capable enough to take it further than I ever did. I got lots of emails over the years from people who were looking for something better than the golden-engineering x-ray machines. 15-Oct-20 09:04 PM My energy nowadays is going into solar power, no time for this anymore. 15-Oct-20 09:11 PM Ugh, Golden. Really, what people need are nicer detectors and software. Golden stopped trying thanks to a fat DHS contract, but luckily others have not. 15-Oct-20 09:12 PM You are 100% correct and that is why my business shifted into detectors 15-Oct-20 09:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Radiograph_-_SD_card-12D28.png 15-Oct-20 09:28 PM I was able to get some pretty killer radiographs out of it back in the day. 15-Oct-20 09:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Pololu-8B429.gif 15-Oct-20 09:28 PM Nowadays I have even sharper focused tubes to play with but, they are on the shelf for now until I can make time for them. 15-Oct-20 09:31 PM Oh wow 15-Oct-20 09:40 PM If anyone has x-ray questions in general feel free to send them my way, I've worked on radiography equipment for many years. 15-Oct-20 10:23 PM Would you recommend the hamamatsu microfocus tubes? @adammunich 15-Oct-20 10:24 PM I have not played with those ones myself, but for reference, the images above were taken with a 50um focus. 15-Oct-20 10:24 PM How many kV? 15-Oct-20 10:29 PM Those photos, both about 50kVp 15-Oct-20 10:29 PM It seems to be the ideal energy for circuit boards 15-Oct-20 10:30 PM In terms of resolution, do you see significant improvement with developing a film in something like a medical imaging cassett, versus digital radiography by pointing a camera at an intensifying screen? 15-Oct-20 10:30 PM Hamamatsu is solid. Bruker is too, but at a price premium. 15-Oct-20 10:32 PM @Mason_Yu You get much higher resolution using paper films directly but the exposure time can be significantly longer. I have had a lot of good results using the sony A7S camera in addition to a cassette screen, and managed to do CT reconstruction this way as well. With an f/1.7 lens, I was able to do a single expoure with less than 1mR. 15-Oct-20 10:32 PM Typically much less. 60 exposures for my CT reconstruction ended up being about 5-6 mR on average. 15-Oct-20 10:32 PM You do sacrifice a lot of resolution with the cassettes though, and if you're doing still life photography using paper film directly often has much better results. 15-Oct-20 10:35 PM Do you have a good source of paper x-ray films? Any brands you'd recommend? 15-Oct-20 10:36 PM Doesn't need to be x-ray, the regular kodak, fuji, etc paper film works well enough. 15-Oct-20 10:37 PM Just want to minimize exposure time 15-Oct-20 10:39 PM Cassettes will get you very fast exposures but you're going to be hard pressed to get more than a few lines per mm resolution from them. The absolute best results will come from slow (iso < 400) film and a serveral second to 1m exposure depending on the subject. It's pretty easy to shield x-rays less than 50kVp though, 2-3mm of lead is plenty. I have a lead box with an interlock for most of my x-ray shenanigans. 15-Oct-20 10:39 PM If that's hard to acquire though, you can dig a pit into the earth and cover it with something like a steel plate instead, which admittedly, is much more environmentally friendly than a lead box. 15-Oct-20 10:39 PM With my 2mm lead box, the increase in background radiation is negligible with the tube on. 15-Oct-20 10:43 PM I'm looking at getting lead for the HPGe anyway, just don't have a good source for actual coated lead bricks used in radiology. I'm going to get some lead roof flashing for now and make do 15-Oct-20 10:43 PM For the HPGe that is, if I do get an x-ray tube I'll need more most likely 15-Oct-20 10:44 PM I used roof flashing from rotometals. For lead bricks you can usually go to an auto parts store/ tire shop and ask for their supply of old weights. They often have 100+ lbs of them. 15-Oct-20 10:44 PM Though nowadays I'm not sure if they use lead as much anymore. 15-Oct-20 10:45 PM They are very unwieldy and I would prefer smaller lead bricks that are painted/coated 15-Oct-20 10:45 PM Tool dip will do nicely. 15-Oct-20 10:46 PM 10+ years ago I melted a lot of the weights into said bricks using a steel can and propane burner, worked well enough. 15-Oct-20 10:46 PM Also fabricated this 1cm thick box which at the time I had used to hold an x-ray tube but now holds some fiestaware. 15-Oct-20 10:46 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201015_224556-C109F.jpg 15-Oct-20 10:46 PM This box will outlive all of us I am sure 15-Oct-20 10:48 PM What sort of intensifying film options are out there? Last I checked there was one guy selling them on eBay and he doesn't seem to be doing it anymore 15-Oct-20 10:49 PM I have a few gadox screens 15-Oct-20 10:49 PM They come with different speeds which means, different crystal grain sizes. Faster ones have less resolving power. Most of the brands are basically equivalent. 15-Oct-20 10:49 PM These are quite cheap from China actually 15-Oct-20 10:50 PM You will have better luck buying "cassette" rather than the screens themselves. You can just rip the screen out of the cassette. 15-Oct-20 10:51 PM Was considering that but would prefer to avoid having to do that...and the only person with them locally wants me to take a bunch of them off their hands 15-Oct-20 10:52 PM The screens are not strongly attached you won't damage it by removing it 15-Oct-20 10:54 PM Think that's a project that has to wait for more regulatory friendly surroundings anyway but accumulating the parts wouldn't be a bad thing 15-Oct-20 10:54 PM A cassette doesn't stop you from using the intensifying screen to do digital radiography, I don't think that's a problem, just make sure you get a fast screen for shorter exposure time 15-Oct-20 10:56 PM Yeah that would be the plan eventually just do not think California is a friendly place to be doing that sorta thing. 15-Oct-20 10:56 PM Just don't put other people in danger and you'll be ok 15-Oct-20 10:56 PM Or your camera, use a mirror at 90 degree angle or your images will come out with lots of hot pixels. 15-Oct-20 10:57 PM For sure do your shielding calculations... And consider the effect of back scatter so surround your tube on all sides, I'm planning for at least 4 HVL of shielding materials for a small microfocus tube 15-Oct-20 10:58 PM @LRM Do it at home, make no money with it, endanger no one else, keep it shielded and do not share your toys and you won't cross the line where the CDPH-RHB cares. 15-Oct-20 10:59 PM If you put your x-ray source in an interlock box then even if you get a visit from regulators (like me) they walk away feeling ok about it. 15-Oct-20 10:59 PM My only concerns are regulatory... the shielding and all the rest for xrays at the energies for imaging small thing things is fairly simple. Worst case I don't want to end up with people in bunny suits freaking out my neighbors after posting photos/video less worst case I do not want people paying unannounced visits for any reason. 15-Oct-20 11:00 PM Refrain from sharing and you won't have that problem. 15-Oct-20 11:00 PM Sharing meaning the physical device and not photos I hope... 15-Oct-20 11:01 PM In my experience no one cares about radiographs 15-Oct-20 11:01 PM As long as they don't have humans in them 15-Oct-20 11:03 PM Correct. Adam likely got a visit due to sharing a device. 15-Oct-20 11:03 PM Hah actually we invited a person to a party not knowing what his job was, whoops 15-Oct-20 11:04 PM I feel like that most commonly happens with people who have invasive species as pets 15-Oct-20 11:04 PM What the state really wants is radiation producing machines registered so they can make sure they don't go walkabout. Kind of like registering firearsms. 15-Oct-20 11:05 PM @idmb or "exotic pets" in general...which is why I have a great distaste for unannounced visits from regulators...but they ended up just talking about reptiles with me for like 45mins and playing with my tegus. 15-Oct-20 11:05 PM Yeah there's a form you're supposed to fill out to register live x-ray tubes if you want to be super compliant. But x-ray sources show up on sfbay.craigslist.org all the time so presumably it's not something they hunt heads for. 15-Oct-20 11:05 PM Invasive species however, that'll get you in some deeper trouble. 15-Oct-20 11:06 PM Oh, they watch. 15-Oct-20 11:07 PM I'm sure the more info they have, the easier the probably cause warrant / whatever comes when they see you say something they're actually worried about. 15-Oct-20 11:07 PM Yeah don't be that idiot on twitter that takes apart radium buttons 15-Oct-20 11:07 PM You can't really go wrong with an interlock box though, two wine crates, soldering iron and $120 to rotometals will get you all you need. 15-Oct-20 11:07 PM It's nice too to not have to leave the room when taking radiographs of your circuit boards . 15-Oct-20 11:07 PM /especially/ if you do a lot of BGA rework like I have to sometimes. 15-Oct-20 11:13 PM What is saving the Wild Radiation West of the Bay Area from the boom dropping is the fact that the state is painfully understaffed and overworked. They're mainly focused on hospitals because that absolutely must be regulated. Larger non-medical institutions should feel lucky if they're seen once every 3 years, often much longer. It isn't a great situation. Play well and you won't stretch their limited resources even thinner. 15-Oct-20 11:13 PM How nice of them they even give you an x-ray shielding table nowadays https://www.rotometals.com/lead-sheet-plates/ 15-Oct-20 11:15 PM How much do you play for their lead per lb? 15-Oct-20 11:15 PM The shipping must be quite a lot right? 15-Oct-20 11:16 PM They allow pickup if you live anywhere in the SF Bay, otherwise shipping is expensive but not outrageously so. 15-Oct-20 11:16 PM Oh they offer free shipping on some items, but the prices is pretty high 15-Oct-20 11:17 PM If you are using dental x-ray tubes I recommend https://www.rotometals.com/lead-sheet/sheet-lead-1-16-4-lbs-sq-ft/ 15-Oct-20 11:19 PM I think this is a good price with free shipping: https://www.ebay.com/itm/293500370629 15-Oct-20 11:19 PM 1/16" certainly seems to be the best option in terms of price vs flexibility 15-Oct-20 11:19 PM Yeah though that thin stuff is going to need a lot of soldering, wider sheet is worth it for that reason if you value your time. 15-Oct-20 11:20 PM I don't have any x-ray tube (yet), so this is for the HPGe detector, and 6" is a good width 15-Oct-20 11:21 PM Gotta get your hands on some of that ancient roman lead for low background radiation lol 15-Oct-20 11:22 PM You'll want a second inner layer of copper as well, just to quiet things down. That's likely easier to lay hands on. 15-Oct-20 11:24 PM My detector is in a bit of an awkward position to put a ton of shielding on since it extends out of the big dewar and has a 90 degree bend. I'll figure something out but it won't be inside one of those great big lead chambers for vertical detectors 15-Oct-20 11:25 PM This sheet stuff is extremely malleable you can papermache something I'm sure 20-Oct-20 09:53 AM I will never stop saying this. I HATE SURPRISE ACCELERATORS. 20-Oct-20 09:53 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-229E8.jpg 20-Oct-20 09:57 AM wait what 20-Oct-20 09:57 AM is it one of those cute 1-2 MeV van de graaf thingies? 20-Oct-20 10:15 AM Yes 20-Oct-20 10:15 AM A certain Austrian is on my excrement list today. 20-Oct-20 10:20 AM that escalated quickly 20-Oct-20 10:20 AM How do you get surprise accelerators anyway 20-Oct-20 10:24 AM When someone finds a way to avoid the procurement controls, fails to notify anyone, and then I find it = SURPRISE ACCELERATOR 20-Oct-20 10:24 AM and how do I get one? 20-Oct-20 10:28 AM In short, someone is about to get torn a new one before we work on figuring out how to make this thing legal. In the very best case scenario, they won’t be allowed to turn this on, much less do work, until January 2021. 20-Oct-20 10:30 AM that's a pretty great scenario isn't it? 20-Oct-20 10:38 AM It is much more likely this won’t operate until 2022. 20-Oct-20 11:05 AM how much do those cost? 20-Oct-20 12:11 PM Couple $100k, but this was likely the low, low cost of free. 20-Oct-20 12:16 PM ah 20-Oct-20 12:16 PM I was gonna say that looks like something you'd need a grant for... 20-Oct-20 02:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/00p0p_2YNHEooKNLu_0Ny144_600x450-F2E38.jpg 20-Oct-20 02:02 PM Found the perfect thing to hold all the vacuum chamber stuff 20-Oct-20 02:14 PM Writing letters of mea culpa to regulators in not my favorite thing. Especially when it is not my culpa. 20-Oct-20 02:16 PM can't you just send the photo with "look what I found!" 20-Oct-20 02:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screenshot_20201020-143502_Drive-42623.jpg 20-Oct-20 02:36 PM Spicy 20-Oct-20 03:38 PM Oh my, that must have a loooooong stack of tandem disks to get up to 1.7 MV 20-Oct-20 03:38 PM Does it come filled with SF6? 20-Oct-20 08:59 PM NEC's Pelletron systems do, which makes them tricky to explain to regulators that don't understand SF6 is essential for operation, for which there is an exemption, but it is also the most potent greenhouse gas there is and it's specifically called out in the Paris Agreement. They understand switchgear, not accelerators, but I've educated the City of Berkeley at least. A couple of times. It is otherwise verboten. 20-Oct-20 09:21 PM oh 20-Oct-20 09:21 PM funranium 20-Oct-20 09:21 PM speaking of SF6 being essential 20-Oct-20 09:21 PM https://multimedia.3m.com/mws/media/1418734O/j382445-ee-ems-05-novec-4710-2017-print-brochure-a4-v3.pdf?fn=prodinfo_novec1230.pdf 20-Oct-20 09:21 PM it supposedly isn't essential anymore 20-Oct-20 09:21 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-8AFE5.png 20-Oct-20 09:21 PM https://www.epa.gov/sites/production/files/2017-02/documents/nyberg_presentation_2017_workshop.pdf 20-Oct-20 09:46 PM they seem to recommend mixing the 4170 with CO2 to get closer to SF6's characteristics though pure 4170 looks pretty good 20-Oct-20 09:46 PM plain 4170 has about 2x the insulating power on its own vs SF6 21-Oct-20 12:45 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201021_004359-BC020.jpg 21-Oct-20 12:45 AM Hermetic, 1A, 10kV, ultrafast avalanche-rated diodes --filed under things that sounded fun until you finish 10 of them and question whether it was a sensible use for 2 hours. 21-Oct-20 04:30 AM https://gigabecquerel.wordpress.com/2020/10/21/pictures-of-detectors/ 21-Oct-20 08:11 AM @adammunich SF4007-TFK? 21-Oct-20 08:11 AM https://www.vishay.com/docs/86060/sf4001.pdf 21-Oct-20 09:43 AM Yup my favorite diode 21-Oct-20 09:43 AM I have never killed even one in 13 years of high voltage bologna 21-Oct-20 09:43 PM @funranium https://discord.com/channels/513115950501855256/513120662756524044/768328065825898547 22-Oct-20 10:32 AM $600 pile of gaskets smh 22-Oct-20 10:32 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-EFC1F.jpg 22-Oct-20 12:41 PM Got my Christmas shopping done early. 22-Oct-20 12:41 PM My gf is a space geek. And she loves space doggos. 22-Oct-20 12:41 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-E2430.jpg 22-Oct-20 12:41 PM Coins made by the company that makes Soyuz, made from aluminum flown in space. With Laika. Belka and Strelka, and Chernushka. 22-Oct-20 12:41 PM Fun trivia: Khrushchev gave one of Strelka’s puppers to Jacqueline Kennedy. 22-Oct-20 12:41 PM And when Pushinka had puppers of her own with one of Kennedy’s other doggos, one of the puppers went to a very lucky kid who wrote a letter to the White House. 22-Oct-20 12:41 PM Now that I think of it... would that make these... dogecoins??? 23-Oct-20 07:12 AM Wow thats pretty cool 23-Oct-20 07:24 AM Thanks!!! 26-Oct-20 12:50 PM I am currently working on a proper case for my gamma spectrometer 26-Oct-20 12:50 PM red pitaya, preamplifier and high voltage supply in one case 26-Oct-20 12:50 PM just laser cut everything that will be a PCB in the end and wow I like how it looks 26-Oct-20 12:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2020-10-26_20-44-43-EAC53.jpg 26-Oct-20 12:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2020-10-26_20-44-45-EC3FF.jpg 26-Oct-20 12:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2020-10-26_20-44-50-3AC2B.jpg 26-Oct-20 12:50 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/photo_2020-10-26_20-45-05-F784C.jpg 26-Oct-20 12:50 PM all black PCBs with white silkscreen for text... 26-Oct-20 12:50 PM I'll move a few things around but all in all I am really happy with how this turned out! 26-Oct-20 12:53 PM Wow that is clean 26-Oct-20 12:58 PM That looks really good 26-Oct-20 12:58 PM And the button on the front too 26-Oct-20 12:58 PM Is it lit? 26-Oct-20 12:59 PM it will be 26-Oct-20 12:59 PM just need an LED for it, it currently has a 60V light bulb 26-Oct-20 12:59 PM color suggestions? 26-Oct-20 12:59 PM IMO green 26-Oct-20 01:12 PM I’d go for just white 26-Oct-20 01:12 PM Reminds me of the console power on light for the reactor 26-Oct-20 01:14 PM gotta see if I can find a warm white LED for this 26-Oct-20 01:22 PM Is the interior shielded at all? 26-Oct-20 01:25 PM the Box is completley closed 26-Oct-20 01:25 PM If needed I can add some internal shields as well 26-Oct-20 01:26 PM Nice!!!! 26-Oct-20 01:30 PM Thanks :) 26-Oct-20 01:39 PM That power button takes it to next level! 26-Oct-20 01:53 PM yeah I found it in my stash and it just had to go in something nuclear related 26-Oct-20 01:53 PM Good choice 26-Oct-20 01:53 PM I should do something like that when I eventually put together the alpha particle spectrometer 26-Oct-20 01:54 PM are you going the PIN diode route? 26-Oct-20 01:54 PM like the thing by olliver keller 26-Oct-20 01:55 PM Yeah 26-Oct-20 01:55 PM oh cool 26-Oct-20 01:55 PM But probably looking at doing it under vacuum 26-Oct-20 01:55 PM I'll give a workshop with olliver at our fablab next month 26-Oct-20 01:56 PM Oh very cool 26-Oct-20 01:56 PM well, we're doing the beta detector variant to make it easier 26-Oct-20 01:56 PM but I was meaning to try the alpha variant in one of my spectrometers 26-Oct-20 01:57 PM I’ve got almost all the parts now except the enclosure 26-Oct-20 01:58 PM let me know how it goes! 26-Oct-20 01:58 PM he said the diode has a ~5 µm dead layer 26-Oct-20 02:29 PM Will do! 26-Oct-20 10:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/qg2XJhIqBCKR6TpzQ7v1yI6LOdAz0Apkbu_IpFb-gc-0D1DC.png 26-Oct-20 10:00 PM I finally figured out how to make tiny displays work reliably 26-Oct-20 11:06 PM What sort of cool things can you do with a tiny display 26-Oct-20 11:06 PM Curing resins sounds like it would be neat 26-Oct-20 11:15 PM Gonna clean up this RF generator. It’s a 40’s era RCA unit used for induction heating tubes or CRT’s. We had about a half dozen of them at the tube factory. They are near bulletproof and the design is simple but very strange in construction. The layout is very very specific. Eddy currents in how the grounding is done are a factor in it working. I was warned by one of the old timers 20 years ago that I should prepare to be very very confused if I had to fix one. I am going to take some detailed photos and map out the routing of everything. Once you figure out the method to it’s madness it’s actually pretty straight forward. Two 833 power triodes in parallel and a modified Hartley circuit. It uses a split capacitor network for the feedback to the grid. Power is controlled by a 15 amp 250 volt variac right to the plate transformer. No filter caps. It runs on unfiltered rectified 120 hz at 4000 volts AC (8000 vct at 1 amp transformer) max via two mercury vapor rectifiers. As originally used the work coil was part of the tank circuit bringing thousands of volts at hundreds of amps out into the environment. I put a current transformer on mine to make it slightly less Killy in nature. 26-Oct-20 11:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-A3B1C.jpg 26-Oct-20 11:36 PM @Charles that looks really cool is there a schematic? 27-Oct-20 07:18 AM I am making one. RCA never published one. They only made them for internal use. 27-Oct-20 11:46 AM Keep me posted I am super into it 27-Oct-20 11:51 AM yay I found an LED replacement for the button 27-Oct-20 11:51 AM sadly 8000 kelvin 27-Oct-20 11:51 AM but better than nothing 27-Oct-20 06:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-674DF.jpg 27-Oct-20 06:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-AB224.jpg 27-Oct-20 06:38 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-1796E.jpg 27-Oct-20 07:04 PM This has a deck style RF ground and all capacitive values in the tank circuit are split between the RF deck ground and chassis ground. It partly relies on eddy currents. 27-Oct-20 07:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-EC17E.jpg 27-Oct-20 07:04 PM And those caps that are oxidized are still within 1% tolerance. Only cosmetically bad. I believe if I just fixed the damaged output connectors and powered this thing up I have no doubt it would snap right back to life. But it’s going to live a hard life again so time to do some housekeeping. 27-Oct-20 07:17 PM What is that hanging from a pipe cleaner(?)? Definitely curious to see what the schematic ends up looking like if you are willing to share it 27-Oct-20 08:17 PM It’s a comb wound coil. 3 mh 27-Oct-20 08:17 PM Its not original. This unit would have come with a single layer wound coil but somebody put this one in at some point most likely to allow lower frequency operation. 27-Oct-20 08:17 PM It used to hang off the bottom of a plastic 10 pound empty wire spool but broke when this unit took a tumble off the tailgate of a trailer. I will make a more suitable holder. 27-Oct-20 08:17 PM These days they would be called basket wound. 27-Oct-20 09:15 PM Chicken scratch version of the main part of the circuit. It’s so hard to draw to get the layout idea across. Need 3D modeling! 27-Oct-20 09:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-33BEC.jpg 27-Oct-20 09:46 PM Oops. Missing the grid load resistor. 5K 100 watt high voltage breakdown type from the grid circuit to chassis ground. 28-Oct-20 11:28 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201028_143853-16F1C.jpg 28-Oct-20 11:28 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201028_184703-CB010.jpg 28-Oct-20 11:28 AM turns out those cheap stove tops can melt lead if you insulate them well enough 28-Oct-20 11:28 AM reminds me, I need to get some lead 28-Oct-20 11:28 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201028_185043-91461.jpg 28-Oct-20 11:28 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201028_190328-927C1.jpg 28-Oct-20 11:28 AM I melted my lead scraps into bricks today 28-Oct-20 11:28 AM reminds me, I need to get some lead @Addison-110m highly recommended 28-Oct-20 11:28 AM look in #swap-meet for a good starter 28-Oct-20 11:29 AM just working on the where part 28-Oct-20 11:29 AM look in #swap-meet for a good starter that's a good price minus the shipping 28-Oct-20 11:31 AM I got all of my lead from the scrapyard 28-Oct-20 11:31 AM apart from a roll of roofing lead 28-Oct-20 11:32 AM I spent a while looking for a scrapyard near my parents house that would sell to individuals 28-Oct-20 11:32 AM no dice 28-Oct-20 11:33 AM might just have been looking in the wrong place 28-Oct-20 11:34 AM but the roofing lead was surprisingly close to what I paid at the scrapyard 28-Oct-20 11:34 AM though the pig isn't much different in price per kg than what I remember seeing honestly 28-Oct-20 11:34 AM yep, am selling close to what I paid for 28-Oct-20 11:40 AM looks like maybe somewhere equivalent to 4 - 5 € / kg shipped 28-Oct-20 11:40 AM though if i do it out in oregon I can potentially get lead for free if I'm willing to accept garbage quality 28-Oct-20 11:40 AM (so outer bulk shielding) 28-Oct-20 11:41 AM maybe you can go sifting at a shooting range 28-Oct-20 11:42 AM that was my thought process above 28-Oct-20 11:42 AM there's antimony in there but that doesn't make it worse at shielding 28-Oct-20 11:42 AM oh, I see 28-Oct-20 11:42 AM the soil dust though 28-Oct-20 11:43 AM nowadays you won't even get funny looks if you wear a mask 28-Oct-20 11:43 AM (I hope) 28-Oct-20 11:45 AM I mean, I dont think anyone would question lead dust 28-Oct-20 12:44 PM Lead from ranges is getting harder these days, unfortunately. Pretty sure there’s still a foundry somewhere near Portland where you can get some. I think it’s in Milwaukie. 28-Oct-20 02:03 PM oh hm, I'll look, that's really close to me 28-Oct-20 02:04 PM @Addison-110m go to tire repair shops they often have to pay to dispose of it 28-Oct-20 02:04 PM Sometimes you can walk out with a hundred pound bucket 28-Oct-20 02:04 PM is it still lead? 28-Oct-20 02:04 PM here they use iron 28-Oct-20 02:05 PM Sometimes, but iron floats on lead it's not a problem to separate it 28-Oct-20 02:06 PM thanks, second good idea 28-Oct-20 03:30 PM Lead from abandoned firing ranges is great and free if you are willing to put in the time and effort... 28-Oct-20 03:30 PM Take a respirator 28-Oct-20 03:30 PM I have a spot I have gone a couple times but since the burn bans have been going it is more trouble than it is worth 28-Oct-20 03:30 PM I use a propane stove to just melt it down before driving home 28-Oct-20 06:40 PM Ranges generally get top dollar for their lead as the recyclers also get the copper from the jackets out of it too so they are less likely to sell it to the public. Also just general fear of the government makes them shy away fine anybody without a hazmat transport licsence. 28-Oct-20 06:40 PM Perks of “Range” meaning random places out on state forest land 28-Oct-20 06:42 PM That’s true, however that has come to an end here in California. No more lead East or west of the San Joaquin valley. Still lots out there but places are getting fewer and fewer to be worth sifting the dirt 28-Oct-20 06:43 PM It’s still ok in Oregon as far as I know 28-Oct-20 06:59 PM I would love to get a hold of some lead in Chicago. 28-Oct-20 06:59 PM The irony is I used to own 2100 lbs of lead, but I sold it. 28-Oct-20 06:59 PM Although, all things considered, if selling the sailboat was hard, selling it with a conveniently missing keel would be even harder.... 28-Oct-20 07:20 PM @Charles 28-Oct-20 07:20 PM https://sfbay.craigslist.org/eby/for/d/pleasanton-misc-lead-shot-in-partial/7210502339.html $1.50 / lb 28-Oct-20 07:20 PM These guys have sheet lead https://sfbay.craigslist.org/nby/mat/d/lead/7210608078.html 28-Oct-20 08:28 PM Hello and good bye mercury rectifiers. 28-Oct-20 08:28 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-995BC.jpg 28-Oct-20 08:49 PM What happened? Did they fry? 28-Oct-20 10:18 PM They are just too unreliable. Also they require the filament transformer to withstand the full plate voltage which in this thing is up to about 5kv peak. Over the years servicing these units I have found that to be one of the weak points. Most failures were associated with those three components. Just easier to replace them all with a diode string on a piece of phenolic board. Also it eliminates the long mercury warm up period. 28-Oct-20 10:42 PM want 29-Oct-20 04:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201029_121054-C5B60.jpg 29-Oct-20 04:44 AM yay 29-Oct-20 04:44 AM awww 29-Oct-20 04:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201029_124038-697BF.jpg 29-Oct-20 12:26 PM What metal is your boat? 29-Oct-20 12:27 PM W 29-Oct-20 12:27 PM What cost? 29-Oct-20 12:27 PM 15 bucks shipped 29-Oct-20 12:27 PM Ooo very nice 29-Oct-20 12:29 PM https://www.ebay.de/itm/174456463586 11-Nov-20 12:35 PM https://www.youtube.com/watch?v=yueBZS69n8Y 12-Nov-20 12:17 AM XPS being decommissioned 12-Nov-20 12:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-348BD.jpg 12-Nov-20 12:17 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-F2D21.jpg 12-Nov-20 12:17 AM ohhh pretty 12-Nov-20 12:19 AM Agreed 12-Nov-20 08:37 AM Homie lacks closed toed shoes around heavy and sharp stuff 12-Nov-20 10:01 AM It is a neverending battle to get the physicists to wear closed toed shoes. 12-Nov-20 10:02 AM We have had to remind people on rate occasion to wear closed toed shoes in the reactor bay. 12-Nov-20 10:03 AM It's been a few years since I've had kick a student out of the old reactor room with "Pants. Shoes. OUT!" 12-Nov-20 10:25 AM Because my schedule for work is weird and irregular,it’s a major impediment to me wanting to wear dresses sometimes 12-Nov-20 02:21 PM @funranium you'd think all the convenience store signs "no pants, no shoes, no service" would be a little more ingraining into people 12-Nov-20 02:21 PM Err, I guess those are actually no shirt no shoes no service 12-Nov-20 02:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201112_141037-515BA.jpg 12-Nov-20 02:52 PM Very pretty microscopy unit 12-Nov-20 02:52 PM 5um, the tube has several focusing optics much like a CRT 12-Nov-20 02:52 PM Yet unclear if it works though 12-Nov-20 02:52 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image-F498C.png 12-Nov-20 03:33 PM @adammunich Which model number is it? Has a slightly different configuration on the PCB so far i can see it, just cuirous 13-Nov-20 04:55 AM Oh btw is it ok if any work photos I post here don’t get reposted or shared publicly? Just in case somebody sees it and it causes drama 13-Nov-20 04:55 AM I would happily enforce closed toe shoes in all labs (and do) as long as the bureaucracy people stop demanding it in computer labs 13-Nov-20 04:56 AM hmm, after all this is a public place and we can't vouch for everyone 13-Nov-20 05:00 AM True 13-Nov-20 05:00 AM You’ve heard of Ethernet-to-garden hose adapters ? Well here’s the expensive version 13-Nov-20 05:00 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-D5FA2.jpg 13-Nov-20 05:00 AM Lemo to Swagelok 13-Nov-20 05:00 AM And yes this is a real thing somebody made 13-Nov-20 05:03 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-FB32E.jpg 13-Nov-20 05:03 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-403E5.jpg 13-Nov-20 05:03 AM Lots of bolts and swearing today 13-Nov-20 05:03 AM And I have closed shoes 13-Nov-20 05:03 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-72E27.jpg 13-Nov-20 05:05 AM turns all the knobs and presses all the buttons 13-Nov-20 05:06 AM now we know who to send the repair bill to 13-Nov-20 05:06 AM dang 13-Nov-20 05:22 AM I’m not even sure if that’s part of the same system. 13-Nov-20 05:22 AM I’m certainly asking the boss if I can keep this if it’s not wanted 13-Nov-20 05:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-95EA2.jpg 13-Nov-20 05:25 AM ohh is there still a target installed? 13-Nov-20 05:25 AM @adammunich wait, is that an x-ray microscopy unit !? 13-Nov-20 05:25 AM Good question! I don’t know how how to actually open it and get access to the target 13-Nov-20 05:25 AM Maybe Au target 13-Nov-20 05:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-20D28.jpg 13-Nov-20 05:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-87C9D.jpg 13-Nov-20 05:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-A6ADF.jpg 13-Nov-20 05:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image3-D9DD7.jpg 13-Nov-20 05:25 AM Lots of weird and wonderful things to carefully clean and wrap up. 13-Nov-20 05:25 AM Rotary feedthroughs, big long linear-actuator feedthroughs, controller for a sublimation pump, ion pumps 13-Nov-20 05:25 AM I don’t own any of it but really just fun to spend a few hours sorting it and breaking it down. 13-Nov-20 05:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-8F3EE.jpg 13-Nov-20 05:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-D5D17.jpg 13-Nov-20 05:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-DAA6E.jpg 13-Nov-20 05:25 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image3-3C9AA.jpg 13-Nov-20 06:32 PM @SleepyOwl Joyce you mentioned scary buttons.... 13-Nov-20 06:32 PM My scary buttons: 13-Nov-20 06:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-7F8B7.jpg 13-Nov-20 06:33 PM missile related stuff huh? 13-Nov-20 06:34 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-CAAD6.jpg 13-Nov-20 06:34 PM Yas 13-Nov-20 06:34 PM where from 13-Nov-20 06:34 PM because jealous 13-Nov-20 06:34 PM Thor and Minuteman I 13-Nov-20 06:34 PM That box is my computer controlled beer brewing system. 13-Nov-20 06:34 PM I built it because the buttons became available and... beer + nuclear missiles 13-Nov-20 06:37 PM it's very good 13-Nov-20 06:39 PM https://tenor.com/view/missile-icbm-silo-gif-18763297 13-Nov-20 06:39 PM Russian silo. I’ve visited one. 13-Nov-20 06:40 PM oh? 13-Nov-20 06:40 PM Correction: Soviet. 13-Nov-20 06:40 PM That’s not how US silo doors work. 13-Nov-20 06:54 PM https://twitter.com/ryanpierce_chi/status/794166616766513152?s=21 13-Nov-20 06:54 PM https://twitter.com/ryanpierce_chi/status/794170183317385216?s=21 13-Nov-20 06:54 PM https://twitter.com/ryanpierce_chi/status/794308712102055936?s=21 14-Nov-20 06:38 PM One thing I cannot find on the XPS spectrometer is the X-ray tube, or anything that looks like maybe an X-ray tube or the very high voltage cable or supply for it. 14-Nov-20 06:38 PM Unless it uses a beam of electrons onto a separate target, rather than a traditional “all in one” X-ray tube 15-Nov-20 08:18 AM I think at some point there were some handheld ones that used the peeling tape xray source thingy 15-Nov-20 10:24 AM I don’t know about XPS. But I do know some XRF units use a licensed source to produce x-rays. 15-Nov-20 10:24 AM Ours doesn’t. It’s a tube. 16-Nov-20 07:12 AM Ooh yeah 16-Nov-20 07:12 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-F250B.jpg 16-Nov-20 07:12 AM Got the $$$ Lemo HV cables too 16-Nov-20 07:13 AM oh boy, Jackpot 16-Nov-20 07:13 AM teardown plz :D 16-Nov-20 07:14 AM Eurorack synthesiser except the voltage is 0-10kV 16-Nov-20 07:14 AM The modules basically plug into a backplane, kinda like NIM, the module on the end is the power supply, and the second module with the 40-pin IDC ribbon connectors is i think the interface that sets the polarity and voltage for each HV supply module 16-Nov-20 07:14 AM Titanium sublimation pump. Basically just a fat filament of Ti evaporated under vacuum to act as a getter, used in conjunction with an ion pump 16-Nov-20 07:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-BB669.jpg 16-Nov-20 07:14 AM Power supply for Ti sublimation pump. Basically a big heavy transformer wound for low V and high I, and a variac driving it. Same thing probably work well as a thermal film evaporator. 16-Nov-20 07:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-39553.jpg 16-Nov-20 07:14 AM Photo is blurry sorry 16-Nov-20 07:35 AM @a_quiet_scientist is there a name for the backplane? 16-Nov-20 07:35 AM I’m thinking about the old Leica SEM. It had a weird chassis / backplane that handled the filament / Weinhelt / acceleration HT, the HV supply for the E-T scint, etc. It was controlled by serial over fiber. 16-Nov-20 08:03 AM It’s kinda like VMEbus or DIN41612 sort of thing 16-Nov-20 08:03 AM But there is a second connector with thicker, fatter pins 16-Nov-20 09:22 AM Very nice scores. Wish people would let me take apart cool stuff like that Looks like you had fun. 16-Nov-20 02:28 PM @adammunich wait, is that an x-ray microscopy unit !? @a_quiet_scientist yes when my connector arrives I am going to point it at a dental sensor and see what's up 16-Nov-20 03:47 PM @LRM I only took the lid off the Ti sublimation power supply to have a look, then put it on the shelf in case we ever want a Ti sub pump one day (and ion pump too) 18-Nov-20 10:58 PM well so the "basic" design for my cathodoluminescence detector is finished 18-Nov-20 10:58 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Detector-D56CC.PNG 18-Nov-20 10:58 PM the structure around it will probably change a little bit, the beamdisplacer will probably take 2-3weeks until it will be shipped 18-Nov-20 11:16 PM Very cool 18-Nov-20 11:16 PM Going to do just a PMT or something more advanced? 19-Nov-20 12:06 AM CCD-Spectrometer 19-Nov-20 12:06 AM with an APD-CCD 19-Nov-20 12:07 AM I thought that might be the base based on using a beam shifter instead of light guide 19-Nov-20 12:07 AM i build one for a Ramanspectrometer wich will possibly be integrated 19-Nov-20 12:07 AM the only part that is missing is a vacuumbellow 19-Nov-20 12:08 AM This is going to be the best equipped 6460 ever lol 19-Nov-20 12:09 AM that's the plan hehe 20-Nov-20 08:47 AM A quick scintillation detector power supply and bias tee 20-Nov-20 08:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-B764D.jpg 20-Nov-20 08:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-C5C37.jpg 20-Nov-20 08:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-CB196.jpg 20-Nov-20 08:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image3-A2510.jpg 20-Nov-20 08:48 AM ohh I like it 20-Nov-20 08:48 AM what's the hvps? 20-Nov-20 08:51 AM Gamma high voltage MC30 20-Nov-20 08:52 AM fitting name 20-Nov-20 08:52 AM I wonder what those HVPS were designed for 20-Nov-20 11:14 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/PXL_20201121_071310068-AE8EB.jpg 20-Nov-20 11:14 PM Come and join me on the moon base 20-Nov-20 11:14 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/PXL_20201121_071507680-AFF8B.jpg 20-Nov-20 11:14 PM FOR ANTS! 20-Nov-20 11:14 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/PXL_20201121_071727668-58969.jpg 20-Nov-20 11:14 PM Actually just my Faraday cup 21-Nov-20 04:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-E36D7.jpg 21-Nov-20 04:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-CC1F9.jpg 21-Nov-20 04:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-85C59.jpg 21-Nov-20 04:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image3-D0FEB.jpg 21-Nov-20 04:14 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image4-D8CF0.jpg 21-Nov-20 04:14 AM RF PA, multipole DC bias controller, high Q head and some other bits 21-Nov-20 04:14 AM From a small benchtop electrospray mass spectrometer 22-Nov-20 01:04 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201122_220133-FF2D5.jpg 22-Nov-20 01:04 PM Poor mans faraday cup 22-Nov-20 07:22 PM wimshurst machine build (leyden jars unrolled with a single shared plate that covers the entire base with each side being removable and containing the other plate) 22-Nov-20 07:22 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/wimshurst20201122-C5003.jpg 22-Nov-20 08:45 PM Hmm. That pa19 has BeO in it, like my pa88s do. How do you know if the heatsink compound also does? Im somewhat afraid of white heatsink compound cause the thought of a BeO emulsion freaks me our 22-Nov-20 11:52 PM A lot of power chips like that have an internal BeO ceramic substrate 22-Nov-20 11:52 PM I’ve never heard of BeO thermal grease ... I certainly hope that’s not a thing, it would be way too dangerous 22-Nov-20 11:52 PM Argh 22-Nov-20 11:52 PM https://www.eevblog.com/forum/chat/beryllium-oxide-heat-sink-compound/ 22-Nov-20 11:52 PM I’m usually pretty lazy with PPE and stuff handling most chemicals ... but Be in any form that could liberate particles or contamination is scary, nasty stuff. 23-Nov-20 01:19 AM i would be really surprised if BeO thermal compound (not in solid ceramic form) was used on any remotely modern electronics, like post-1970s. especially in a commercial product without any warning as to its presence 23-Nov-20 01:19 AM .. but the mere existence of that makes me a bit concerned about some of the bespoke ex-nat'l-lab 1940s-1960s electronics i've got kicking around 23-Nov-20 01:19 AM i'd wager most white thermal pastes are predominantly zinc oxide, anyways 23-Nov-20 04:22 AM TIL BeO insulators/sheets are still commonly sold, there is some on AliExpress, even one on Digikey. 23-Nov-20 11:10 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_0901-1-6F9DC.JPG 23-Nov-20 11:10 AM we have three of those! they're great! 23-Nov-20 11:10 AM also have an 80 with a booster 23-Nov-20 11:10 AM it sits in the closet with the oil diffusion pumps, never to be used 23-Nov-20 11:11 AM It's at a scrapyard, $320 based on its weight 23-Nov-20 11:11 AM 3 phase 480, ouch 23-Nov-20 11:14 AM $320 and I guarrantee there are hundreds around the globe in storage like ours, that will just be scrapped for nothing in a few decades without being used between now and then 23-Nov-20 11:18 AM They pop up on ebay fairly often for that much or less if I am remembering right 23-Nov-20 11:18 AM Been awhile since I was looking at rotary pumps 23-Nov-20 11:18 AM Got my two for $70 D2.5E score and decided not to press my luck any further. 23-Nov-20 11:19 AM Meanwhile my D2.5E is still overheating like crazy 23-Nov-20 11:19 AM It's getting worse and worse, it will be retiring soon and replaced with the dry scroll pump 23-Nov-20 11:20 AM That sucks :/ ...or doesn't depending on how hot you let it get 23-Nov-20 11:20 AM Any guesses as to the cause of the overheating? 23-Nov-20 11:20 AM Oh it still sucks, pressure is great! But the motor shuts down without an external fan blowing on it 23-Nov-20 11:21 AM oof 23-Nov-20 11:21 AM I'm guessing the trochoid oil pump might be too worn? 23-Nov-20 11:21 AM It is beginning to "aerate" the oil more and more 23-Nov-20 11:23 AM I wonder if a good cleaning would fix that or not 23-Nov-20 11:23 AM Motor overheating sounds like there is some extra resistance inside the pump housing 23-Nov-20 11:24 AM When I get a chance I'll get some flushing liquid and do a full oil change. Maybe scrub down the pump housing too and check oil filter 23-Nov-20 11:24 AM Not sure wear would cause extra resistance unless the bearing(s) crapped out 23-Nov-20 11:24 AM Well a worn trochoid pump would just leak oil through the rotating sealing faces 23-Nov-20 11:25 AM You might consider trying to lube up the motor too 23-Nov-20 11:25 AM It turns out my 14 CFM leybold pump is a perfect flow rate for this Alcatel 5400 turbo according to the turbo manual I got 23-Nov-20 11:25 AM But damned if that thing doesn't atomize oil out of its output port... 23-Nov-20 11:26 AM Almost all rotary pumps will 23-Nov-20 11:26 AM I need to find a way to make sure it doesn't get on everything 23-Nov-20 11:26 AM You probably will want to get an exhaust filter for that to recapture the oil 23-Nov-20 11:26 AM Then it just drips back in after collecting in the filter 23-Nov-20 11:26 AM Well I put what I believed was an exhaust filter on it and it just blew straight through 23-Nov-20 11:26 AM So maybe it wasn't actually an exhaust filter 23-Nov-20 11:26 AM It was filled with some kind of Steel ribbon 23-Nov-20 11:27 AM https://www.sisweb.com/referenc/applnote/app-83.htm 23-Nov-20 11:27 AM Decent overview of how they work for you 23-Nov-20 11:27 AM Figure 4 shows the two designs I am most familiar with 23-Nov-20 11:27 AM Oh but all the ones I have seen have little vents back to the pump for the condensed oil 23-Nov-20 11:27 AM If you do not use a filter like that you absolutely want to vent that oil mist outside or something 23-Nov-20 11:35 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screenshot_20201123-113532-43C7B.png 23-Nov-20 11:35 AM Brand "A" 23-Nov-20 11:35 AM Also name brand versions available for a bit more 23-Nov-20 11:35 AM https://www.ebay.com/itm/ALCATEL-OME-25-HP-OIL-MIST-ELIMINATOR-21603/123957935675?epid=664803861&hash=item1cdc77fe3b:g:PagAAOSwwlJduarj 23-Nov-20 11:48 AM Exhaust filters also ware out over time and stop capturing oil effectively 23-Nov-20 12:00 PM Looks like the "s" model is rated to 14.3 CFM and the "hp" model is 25? 23-Nov-20 12:01 PM Don’t worry about it until you know your planned gas load 23-Nov-20 12:03 PM Evacuation of 50L chamber probably relatively short cycles but infrequent use 23-Nov-20 12:03 PM I already have a molecular sieve input filter but the filter looks like it could probably use a bake out :-) 23-Nov-20 12:08 PM Infrequent use as in you’ll be letting it sit in atmosphere for long periods of time? Or valved off with the pump off? 23-Nov-20 12:11 PM I do have valves but infrequently used in the sense that it's like my experimental vacuum chamber so yeah probably at atmosphere 23-Nov-20 12:12 PM Ouch, well then get some weak heaters for the water at least 23-Nov-20 12:14 PM Yeah unfortunately not in a climate controlled environment (outside...) 26-Nov-20 01:26 AM Someone here once accidentally started a rotary backing pump that had been put back in service with the mist filter off... first noticed it when the laser beams were completely visible from scattering along the beam path. Had to quickly jump on it before covering all the optics in oil aerosol 26-Nov-20 02:48 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-F61E0.jpg 26-Nov-20 02:48 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-6AAE1.jpg 26-Nov-20 02:48 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-A2CD0.jpg 26-Nov-20 02:48 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image3-B1B73.jpg 26-Nov-20 02:48 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image4-10236.jpg 26-Nov-20 02:48 AM Ancient vacuum gauge readouts and RGA controllers and stuff 26-Nov-20 02:48 AM I don’t have space to rehome them and they’re boat anchors - nobody in the modern world needs a 2RU electronics box to read off an ion gauge - so I’m opening them up to see if there are any good parts to salvage 26-Nov-20 07:30 AM Mine does four thermocouples and two ion gauges and has nice interlocks + serial interface, in a half depth 2U 26-Nov-20 07:30 AM We have one with a Nixie tube display somewhere 26-Nov-20 07:30 AM And one that has five TC readouts 26-Nov-20 07:30 AM But does it by cycling which one it is currently reading 27-Nov-20 05:49 PM machined a pendant for a phosphor-lined tritium vial 27-Nov-20 05:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image-AD8D6.png 27-Nov-20 05:57 PM looks nice! 27-Nov-20 06:13 PM thanks! 27-Nov-20 06:16 PM Very cool! 27-Nov-20 06:16 PM Turned+milled? 27-Nov-20 07:13 PM Pretty! 27-Nov-20 07:44 PM For a while someone on ali was selling the nice exit sign ones 27-Nov-20 07:44 PM I've been looking for a green-sensitive solar cell that would be appropriate for a nuclear clock 27-Nov-20 07:44 PM But the leakage current of most PV junctions is actually too high for a good betavoltaic. 27-Nov-20 07:44 PM PIN diodes might be better 27-Nov-20 07:53 PM A really bright and long-lasting beta light with C-14 27-Nov-20 07:53 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-ABBA7.png 27-Nov-20 07:54 PM Thats neat... but the phosphors die long before the c14 will 27-Nov-20 07:54 PM Where the heck is that from? 27-Nov-20 07:54 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-AF967.png 27-Nov-20 07:54 PM Good old radium corp 27-Nov-20 07:54 PM It should be brighter than some of the tritium signs/lights that you can find nowadays 27-Nov-20 07:55 PM Oh wow I thoughtISOLITE was originally a brand of that canadian exit sign company. 27-Nov-20 07:55 PM Only 9 millicuries though, so perhaps the phosphor would last a while? 27-Nov-20 07:56 PM I’ve been tempted to buy an old tritium exit sign minus the whole those aren’t exactly meant to be sold used 27-Nov-20 07:56 PM The specific activity of an exit sign is like 20 curies lol 27-Nov-20 07:56 PM New ones show up frequently surplus 27-Nov-20 07:56 PM Not the point exactly 27-Nov-20 07:57 PM It's interesting that there are so many listings that just has those "not for sale" and "don't remove" labels pictures right on them 27-Nov-20 07:58 PM I think you can buy them brand new from the manufacturers too, you just need to record where it's installed 27-Nov-20 07:59 PM https://www.ebay.com/itm/Vintage-NOS-EXIT-SORTIE-Sign-U-S-Radium-Corp-ISOLITE-Safety-Sign/333056871946 27-Nov-20 07:59 PM Oh here's one 27-Nov-20 07:59 PM 4 curies, probably around 1 now 27-Nov-20 08:00 PM TBH these are not very bright compared to phosphor paint and only make sense in places that are always dark 27-Nov-20 08:00 PM Like in ships, boiler room hallway etc 27-Nov-20 08:01 PM Yeah I've never been very impressed with them... And the tritium content is very concerning, something I would not want to own 27-Nov-20 08:01 PM yeah, I'm a bit familiar with them, like to joke some days that the largest radioactive sources outside the reactor are in the library. 27-Nov-20 08:02 PM But the beta light with C-14 (a pure beta emitter) would be great! 27-Nov-20 08:02 PM Well at last the 3H doesn't stick around like 14C or 226Ra solids 27-Nov-20 08:03 PM Also only 150 keV, no notable bremsstrahlung, less damage to the phosphor 27-Nov-20 08:03 PM They should totally make more in reactors 27-Nov-20 08:04 PM I should put a 3H tube next to my amptek and see what the spectrum looks like 27-Nov-20 08:05 PM minus the terrible absorbtion cross section of carbon-13 27-Nov-20 08:05 PM unless you were planning on another reaction 27-Nov-20 08:05 PM Well they make them from N-14 27-Nov-20 08:05 PM Most of what you breathe contains N-14 27-Nov-20 08:05 PM 14C is biologically scary imo 27-Nov-20 08:05 PM Much more so than 3H 27-Nov-20 08:06 PM ehh, takes a fair bit to be into hazardous areas 27-Nov-20 08:06 PM As is basically any beta or alpha emitter, at least it won't concentrate all in one place 27-Nov-20 08:06 PM With a biological half-life of 10 days too 27-Nov-20 08:07 PM Yeah but in one scenario you have something spread arpund by people's shoes for decades, in another, you open a window and the area is safe after a few hours. 27-Nov-20 08:12 PM fair, and speaking of which, for tritium, very very rough calculation. An 8 Ci source that ruptures in a 33000L room and distributes itself evenly would give very roughly about 1mSv/min 27-Nov-20 08:27 PM “Safe in a few hours” While not remotely as hazardous as some other radionuclides, you have detectable contamination for the next several decades. Cracking open exit signs is not a great idea and a violation of the NRC general license. 27-Nov-20 08:27 PM And it is annoyingly mobile contamination. 27-Nov-20 08:29 PM Indeed, cliff stoll has an excellent tritium story he can tell better than I. 27-Nov-20 08:29 PM You also need pretty specific instrumentation to detect it 27-Nov-20 08:29 PM Which is part of why tritium licensing is not easy or cheap 27-Nov-20 08:31 PM Eh, an LSC is quite sufficient. 27-Nov-20 08:34 PM Off-the-shelve LSC detector solutions are really quite expensive for small labs and companies, and especially so if a large area need to be covered 27-Nov-20 08:34 PM And you might want to have an immediate alarm when the area is constantly monitored, which is hard to do with LSC 27-Nov-20 08:38 PM You play with the nuclides, you get the right monitoring first. Tritium CAMs are questionably useful compared to regular LSC swipe sampling, which is very easy to do. 27-Nov-20 08:40 PM From experience, easy enough to teach to undergrads fairly quickly 27-Nov-20 10:47 PM @AdamMcCombs yeah, from the brass rod above - turned, milled, sanded, filed, polished 27-Nov-20 10:47 PM looking at gold plating now, apparently often uses cyanide...will be fun 27-Nov-20 11:49 PM Just your casual AUD$270 or so worth of opamps. Nice brazed ceramic (milspec?) AD524s 27-Nov-20 11:49 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-3F8BE.jpg 27-Nov-20 11:49 PM Sam Zeloof has a beautiful little DIY sputter build https://twitter.com/szeloof/status/1332345521688731652?s=21 28-Nov-20 12:07 AM that image on the left feels weird 28-Nov-20 12:07 AM nice photo, shiny steel 28-Nov-20 12:07 AM KF + CF 28-Nov-20 12:07 AM vice! ❤️ ❤️ 28-Nov-20 12:07 AM KF clamp, but the weird cylinder handle type! 28-Nov-20 06:31 PM @samy could also sputter coat it 28-Nov-20 06:34 PM @nmz787 that'd be cool. would want to make sure i could recover most of the unused gold, granted i don't really know how much is used during the coating process so maybe it's negligible 28-Nov-20 06:34 PM Depends how thick you want to go I guess 28-Nov-20 06:34 PM going to try making a nickel solution tonight and first nickel electroplating 28-Nov-20 06:34 PM 30-60 seconds was enough to coat my house key a few months ago, it's all worn off by now 28-Nov-20 06:34 PM Afaik nickel sulfamate is the best nickel solution 28-Nov-20 06:37 PM oh nice, will see if i can make that. was looking at making nickel sulfate 29-Nov-20 01:11 AM We regularly run Au sputter / evaporation for various user experiments at uni and lots gets wasted - most ends up on the chamber walls not on the wafer. Maybe line the chamber with foil and reprocess the Au-coated foil after a while. 29-Nov-20 01:10 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201129_021636-D5AB1.jpg 29-Nov-20 01:10 PM Cleaning up after being dumb and breaking your car's immibilizer RFID tag 29-Nov-20 01:10 PM Slightly more kHz than before... 29-Nov-20 07:33 PM My dad hoarded those in the early days because they were going in missiles. He's got like 40 of them in oroginal packaging. 29-Nov-20 07:47 PM Missile test consoles* i mean 30-Nov-20 11:17 AM ahh, thanks for the tip! I've make a nickel plating solution (nickel acetate) and started electroplating nickel onto brass, so now looking to make gold solution and try plating the nickel. would be fun to try sputtering it as well and will try your suggestion once i get my vacuum system back up 30-Nov-20 11:46 PM I’m interested to know if you can make a gold plating solution yourself. I’ve always wanted to try it. You can buy electroplating reagents pre made, but making stuff yourself is fun. Maybe Au dissolved in aqua Regia then diluted? Avoiding cyanide would be good. 01-Dec-20 01:04 AM https://photos.app.goo.gl/232Qep76LvmoocLZ6 planar transformer fun 01-Dec-20 06:41 AM Looks nice... wireless power transfer? 01-Dec-20 06:41 AM I got inspired by Sam’s sputter build. But this is just FDM PLA though, I don’t know if PLA will behave itself in vacuum. Only 25 mTorr though, not really high vacuum 01-Dec-20 06:41 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-FE4A5.jpg 01-Dec-20 06:44 AM FDM plastic will be a virtual leak nightmare, and you probably will notice it at 25 mTorr 01-Dec-20 07:02 AM Maybe I can do the acetone thing (DCM actually since it’s PLA) 01-Dec-20 07:02 AM Or just fit up the design, then either get it SLA printed or machined from Teflon/PEEK 01-Dec-20 07:06 AM Just small note regarding PLA smoothing - I think ethyl-acetate is better then DCM - it is bit more flamable, but much less toxic and dangerous. And is readilly available and works also perfectly... 01-Dec-20 07:47 AM That’s cool, i will try ethyl acetate if I can find some 01-Dec-20 09:02 AM If you have trouble finding pure to buy, you can buy acetone-free nail polish remover - usually it consists mainly of ethyl acetate. However at least in Czech Republic it was no issue buying pure... 01-Dec-20 09:31 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201201_182854-3D962.jpg 01-Dec-20 09:31 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201201_182843-161AA.jpg 01-Dec-20 09:31 AM Still needs some deburring and the mirror polishing and coating. But looks good so far 01-Dec-20 10:43 AM I'm trying to build a Transformer controller that is auto resonant because I can't buy any chips that do the job and it's been surprisingly hard 01-Dec-20 10:43 AM Apparently the dI/dt of all of my nodes is very important information so if I throw a Schmitt trigger or any kind of digital logic in there it just gets hosed 02-Dec-20 08:39 AM resonant transformers can be fun! I wonder what challenges you with your project. What frequency do you run that converter at? Your inductor cores look like they could be made of iron powder, which would likely be very lossy in yout application. Speaking of losses, the copper underneath the coil looks to be a well coupled short circuit secondary on your transformer, even if the copper right underneath the primary was removed 02-Dec-20 09:52 AM . 02-Dec-20 09:52 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/R9Y88-D9613.jpg 02-Dec-20 09:52 AM @analogmultiplizierer the problem I am solving right now is very specific -- having a lot of trouble puzzling it out. I use diodes to detect if the opposite transistor should switch. When one transistor is closed, the diode is pulled down to ground which keeps the opposite transistor off until the LC resonant cycle swings back the other way and flips it. But in the case where I forcibly leave the transistors off for an entire cycle, which is what I want to do modulate the power, the circuit eventually stops oscillating. both ends of the L/C oscillator start to float above 0V and since they never reach 0V, the diodes that detect when the opposite transistor should switch, never enter forward conduction and the circuit latches up. The L/C oscillator nodes naturally want to be at +V if the transistors pulling them down don't turn on, and once they exceed 1.7V or so, no diode forward conduction ever happens. 02-Dec-20 09:58 AM http://www.kiblerelectronics.com/bob/app_notes/note11/note11.html Look at schematic 3, it might help you. I've built that or at least something similar at some time. using 40XX logic with those UF4007 diodes at theit input worked well for me 02-Dec-20 10:00 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screenshot_20201202-095939-AA023.jpg 02-Dec-20 10:00 AM I'm pretty sure this is going to have the same problem right because, it uses the same principle where the cycle detector relies on those nodes at the very top going down below the threshold of the logic gates. 02-Dec-20 10:00 AM With the circuit in particular I'm pretty sure you have to add some Deadtime insertion because the natural behavior of this oscillator requires dead time. 02-Dec-20 10:00 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201201_021855-EBE5F.jpg 02-Dec-20 10:00 AM You can see the gate signals here have some small amount of it 02-Dec-20 10:14 AM the circuit has that cross coupling thing there to protect driving both MOSFets simultaneously 02-Dec-20 10:14 AM If that isn't enough, you might want to add RC low pass networks with diodes parallel to the resistors. I think you can induce a dead time that way, should you really need it 02-Dec-20 10:22 AM The latchup I have observed is not actually both transistors on, it's one getting stuck on. 02-Dec-20 10:22 AM Instead of diodes I tried using a comparator to tell which transistor should be turned on but that didn't really work out, instead I got a Broadband noise amplifier. 02-Dec-20 10:22 AM It seems to be the case that preserving some amount of dead time is very important and also, if the rate of change of the Gate drive signals is too high you might amplify unwanted frequencies. 02-Dec-20 10:22 AM I think if I can somehow make a comparator work as a detector without amplifying a bunch of noise as well, it might solve the problem since the measurement would be independent of the oscillators ground reference. I've just been unable to get that to work so far though. 02-Dec-20 10:34 AM ZVS's are known for occasionally latching up and destroying themselves. 02-Dec-20 10:34 AM It seems to be a price for it's simplicity 02-Dec-20 02:43 PM yeah it's something I need to fix but am unsure about how to yet 02-Dec-20 02:43 PM adding additional parts in the feedback loop so far has just reduced its stability 02-Dec-20 09:45 PM A simple manual valve opener for the $10 VAT valves on eBay 02-Dec-20 09:45 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201202_234506-2BAED.jpg 02-Dec-20 09:45 PM Wasn't able to get the cam profile aggressive enough to provide a full 7 mm of travel with 3D printed components (they use a strong spring in this), so this one locks at 5 mm 02-Dec-20 09:45 PM But if you're using KF16 valves, conductance is probably not a big problem for you 02-Dec-20 09:45 PM https://www.ebay.com/itm/FRESH-TAKEOUT-VAT-26524-KA11-BKS1-IN-LINE-VACUUM-VALVE-338/171899775652 02-Dec-20 09:51 PM Nice. I was thinking a screw mechanism might work for that but did not consider a cam on a lever. 02-Dec-20 09:51 PM I wanted to make this without any metal components so I can print everything overnight 02-Dec-20 09:52 PM Yeah the screw mechanism I designed and then never used (I just use air heh) had 1 metal part, a washer with a slot cut into it to slide over the shaft 02-Dec-20 09:52 PM I like your design better 02-Dec-20 09:54 PM It does take a small amount of grease and a few actuations to make it smoother. I think I can get up to the full travel minus maybe 0.5 mm to lock the lever in place if I used ABS/PETG instead of PLA 02-Dec-20 09:54 PM But yeah I don't want to bring an air compressor to every set-up. Also, you can get two valves for $18 with free shipping 02-Dec-20 09:55 PM Oh man if you are not using PETG yet you will love it. Have not gone back to PLA for much since I started using the PETG 02-Dec-20 09:56 PM I have a spool but was too lazy to swap out 02-Dec-20 09:56 PM And redesign for 1 mm more travel 02-Dec-20 09:56 PM It's a problem if it travels too far and bumps up against the snap ring too 02-Dec-20 09:56 PM I'm going to literally stick this onto the back of the HPGe 02-Dec-20 09:56 PM With Hysol 02-Dec-20 09:56 PM I do have to do a bit of modification on the original seal-off valve though, it's too big for KF16 02-Dec-20 10:07 PM I also need to try opening it when one side is under vacuum and the other side at atmosphere 02-Dec-20 10:07 PM And possibly tweak the cam profile so it's asymmetrical 02-Dec-20 10:07 PM That way the travel is more gradual and create less normal force pressing down on the rotating parts 02-Dec-20 10:56 PM This is both interesting and bizarre to me. 02-Dec-20 11:02 PM Bizarre? 02-Dec-20 11:06 PM Are you planning to repump the HPGe often or...? Not sure why you want to epoxy the VAT valve onto it. Can't make a pumpdown adapter to pull the plug? 02-Dec-20 11:07 PM So there is no mounting point on the back of this cryostat for anything to attach to, except with epoxy 02-Dec-20 11:07 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201203_010840-232BA.jpg 02-Dec-20 11:07 PM Also, these VAT valves have quite good leak rates 02-Dec-20 11:07 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/745917-BF062.pdf 02-Dec-20 11:07 PM I'm not sure I can do much better than 1e-9 mbar l per second by trying to make the old semi-permenant seal-off valve work 02-Dec-20 11:07 PM Having this valve on there means I can hook it up to the side pumping port of one of my 255Hi turbos and just quickly pump it down, instead of messing with some valve opener (that would have to be attached via epoxy or something) 02-Dec-20 11:20 PM Honestly, I'm pretty sure that a rotary feedthrough with o-rings will be a bigger limiting factor than a valve like this in terms of pressure achieved. Also, the valve is pretty small, and won't get in the way of anything on the back of the cryostat 02-Dec-20 11:28 PM Converting valves to be manual 02-Dec-20 11:28 PM We have a leak valve with a stepper motor strapped to it 02-Dec-20 11:28 PM To do the opposite, haha 02-Dec-20 11:29 PM Not everyone has an air compressor handy right next to your vacuum set-up 02-Dec-20 11:29 PM A good idea, I should do that too 02-Dec-20 11:29 PM It’s necessary with our broken sapphire leak valve 02-Dec-20 11:30 PM And I don't want to mess around with air lines and find fittings I don't have just to open a valve 02-Dec-20 11:30 PM The working all metal one is fine 02-Dec-20 11:30 PM But the broken one is 10x more sensitive to foreline fluctuations 02-Dec-20 11:30 PM I've learnt you should always transport the sapphire ones with the flexture arm all the way loose 02-Dec-20 11:30 PM I'm pretty sure one of mine didn't survive the journey when I moved 02-Dec-20 11:39 PM Probably shouldn’t apply 2000psi to them either. 03-Dec-20 01:25 AM @Mason_Yu I definitely could be wrong but I thought those plugs on things usually just have a pumpdown adapter pressed over top of them that seals around the outside of that stem and against the flat face it is coming out of... and then they screw into and pull out the central plug from within the stem for the pumping down before you push it back in. 03-Dec-20 04:55 AM Current sputter coater plan... a 3.375” Conflat adapter with a 1.33” conflat on the top for electrical feedthrough. The plastic magnet holder / insulator will probably be redone in machined PEEK. It will have a cylinder of 38mm Cu around it (a standard plumbing size). And a grounded plate at the front and back and 3 threaded rods around it. 03-Dec-20 04:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-43980.jpg 03-Dec-20 04:55 AM Big beryllium friend... perhaps the most expensive opamp in the world? 03-Dec-20 04:55 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-51A0F.jpg 03-Dec-20 04:57 AM I could not find a datasheet for that one 03-Dec-20 05:03 AM https://www.apexanalog.com/resources/products/pa89u.pdf 03-Dec-20 05:04 AM >.< 03-Dec-20 05:04 AM I was googeling the ps7209905 03-Dec-20 05:04 AM thanks 03-Dec-20 05:04 AM very nice 03-Dec-20 05:04 AM http://www.repeater-builder.com/humor/pdfs/national-lh0033c-damn-fast.pdf I still want one of those 03-Dec-20 08:32 AM @LRM Yes, but there are no threaded holes or anything for this valve puller to attach to. The threaded part in the center of the stem is the top of the valve itself, so after it is pulled under vacuum, it will be attached to nothing but the valve puller. I need something other than vacuum pressure holding the whole assembly down when it is attached to a turbo and when I'm cranking down on the rotary feedthrough. 03-Dec-20 08:32 AM My other concern is that I'll still be using the indium type seal in the old valve, I don't think it offers significant advantage to leak rate and might melt when I'm baking the cryostat. 03-Dec-20 08:32 AM They probably do have a custom set-up in the factory to do this, some pump down adaptor that looks like ones for vacuum tubes. But the difference is I don't mind pumping down the detector every so often (might be every couple of years with two of these valves in series), since I can't keep both detectors cold at all times anyway 03-Dec-20 08:50 AM @Mason_Yu wow those valves just get cheaper and cheaper 03-Dec-20 08:50 AM Grab em' while there're supplies! 03-Dec-20 08:50 AM Great for foreline stuff 03-Dec-20 09:24 AM Just grabbed another two for myself lol 03-Dec-20 09:25 AM @Mason_Yu Have you seen how @GigaSquirrel made their pump down adapter? Pretty sure they were dealing with the same style of plug on the HPGe they pumped down: https://gigabecquerel.files.wordpress.com/2020/01/img_20200109_164823.jpg?w=1024 That sort of style adapter is what I have seen used in almost every single case where someone is pumping down a dewar that I have been involved in or read about. Not sure why you would need more than the vac pressure to hold it on aside from when pressing the plug back in but even then not really a problem? 03-Dec-20 09:26 AM I don't have a welder or a lathe 03-Dec-20 09:27 AM I know I have seen pictures of someone who made one with a KF cross and some fittings 03-Dec-20 09:27 AM And the leak rate of this valve is really good enough for what this dewar require here 03-Dec-20 09:27 AM Why do more than is necessary? 03-Dec-20 09:27 AM Also, the body leak rate doesn't matter in this application 03-Dec-20 09:27 AM From the fact that they sealed the original valve under epoxy and the fact that every single detector with this style of valves I've seen needs pumping, we know indium isn't that much better 03-Dec-20 09:30 AM Mainly I would worry about cracking something into the valve and causing the dewar to vent heh. Just seems like a kinda unneccesary addition of a lot of stick out on the end. Also slightly worried about how exactly you will seal the VAT valve to the dewar without having trapped air pockets/virtual leaks like that but it is your detector 03-Dec-20 09:33 AM Sealing two flat faces together with epoxy isn't really prone to trapped air bubbles or virtual leaks. Also, atmospheric pressure will be pressing down on the valve seat, so you can drop anything down the valve you like. I'll still put a KF16 blank on the end of the valve, but with this strong of a spring + atmosphere holding it down, I doubt even a very strong mechanical shock would cause the valve to vent 03-Dec-20 09:36 AM Are you planning to rough up the mating surfaces before the epoxy? I was thinking you were going to try sealing around the stem. Flat surfaces would be much less of a problem for trapped air/virtual leaks. Hopefully hysol plays well with the materials involved 03-Dec-20 09:39 AM It's just stainless and aluminum, I think Hysol will work okay. I will rough up the surfaces slightly to give a better mechanical bond, but I think mechanical strength is not the limiting factor. If there's a big enough shock that would cause the valve to detach, I should be more worried about FETs and stuff being knocked free in the detector can 03-Dec-20 09:43 AM Hopefully it all goes smoothly. Looking forward to some nice spectra when you get it done 03-Dec-20 09:43 AM It's very likely I'll have to do a beryllium window swap here 03-Dec-20 09:43 AM Waiting for my respirator to get here 03-Dec-20 11:26 PM https://youtu.be/RVaEtMafo7I 03-Dec-20 11:26 PM It works! 03-Dec-20 11:26 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/PXL_20201204_072208267-02F7B.jpg 03-Dec-20 11:27 PM yay! 03-Dec-20 11:27 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/PXL_20201204_0724066982-1FAB5.jpg 03-Dec-20 11:27 PM also slo mo tur bo sounds like something the judoon would say, lol 03-Dec-20 11:27 PM It'll still be smaller than the diff pump with a anti-vibration bellow I'm pretty sure 03-Dec-20 11:27 PM Was thinking why not just do CF all the way up and have a really high vac low-res SEM 03-Dec-20 11:27 PM I mean I think a lower vacuum would at least improve signal to noise for some number of bits, would that at least be an LSB though? 03-Dec-20 11:36 PM Although all the other gaskets would still be old and questionable 03-Dec-20 11:36 PM And rubber 04-Dec-20 07:43 AM aww yeah 04-Dec-20 07:43 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201204_164219-285E4.jpg 04-Dec-20 12:08 PM wow, is that puck available somewhere? i haven't been able to find it 04-Dec-20 12:08 PM were you being too fast and too furious? 04-Dec-20 12:08 PM i'll let you know on the Au solution. atm just been reading up online - i made some nickel plating solution (nickel acetate...with some crud) and plated some brass, though i'd like to understand how i made it first as i've just been following other's instructions and don't understand what's going on chemically. will try to understand this weekend, then venture to Au. there are some papers on cyanide-free electroless plating with chloroauric acid so may try that 04-Dec-20 12:35 PM If you can grab yourself a copy of Modern Electroplating, it has a chapter on all the major platable metals and explains what the ingredients do, variables that affect the process, and recipes. it's a really great resource if you want to go down the electroplating rabbithole 04-Dec-20 12:35 PM a quick skim showed lots of gold cyanide recipes, and one non-cyanide recipe based on sodium tetrachloroaurate and thalium (and a chapter on electroless, which i didnt look at) 04-Dec-20 01:01 PM Ah those are cool. I found one on the dumpster. 04-Dec-20 01:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20191212_221750-1A946.jpg 04-Dec-20 01:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-2E0A2.png 04-Dec-20 01:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-1A892.png 04-Dec-20 01:01 PM It's an PA06. 04-Dec-20 01:01 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-C1E49.png 04-Dec-20 01:01 PM Should be the output darlington. 04-Dec-20 01:50 PM @samy I'm not sure if that's the PDF book I have, but I'll find something to send you 04-Dec-20 01:50 PM Got it earlier this year while doing a lot of research 04-Dec-20 02:02 PM awesome, thank you for this! will check it out 04-Dec-20 02:02 PM woot! 04-Dec-20 04:31 PM The only place you are likely to find one of those is on eBay if the seller lists it creatively or via a private sale from an antiques shop/collector and it would be an extremely rare find afaik 04-Dec-20 05:29 PM There one of those things that belongs in a waste drum as they're all well on their way to decomposition. Various public health agencies across the country reclaim leakers on regular basis, usually for estate cleaning. 04-Dec-20 05:33 PM Ah awesome. The cyanide-free Au process uses thallium. Because of course it does. ️ 04-Dec-20 05:34 PM Gold has the best options. 04-Dec-20 05:36 PM What’s this referring to? The “puck” message? Says it could not be loaded / deleted? 04-Dec-20 06:22 PM Yeah 04-Dec-20 06:22 PM I don’t think it’s been deleted though 04-Dec-20 07:04 PM Yes, the radium nightlight. 05-Dec-20 06:52 AM @samy Unfortunately C-14 nightlight is ultra-rare... Absolutely no idea where you can find one 05-Dec-20 08:24 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201205_172402-B8CE8.jpg 05-Dec-20 08:24 AM Well this detector is getting way bigger than i imagined 05-Dec-20 08:57 AM This means my colleagues have done their job well. 07-Dec-20 07:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/PXL_20201208_030036033-B272E.jpg 07-Dec-20 07:02 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/PXL_20201208_030042269-1BA36.jpg 07-Dec-20 07:05 PM chocolate chips 07-Dec-20 07:11 PM Actually just carriers for the chocolate chips 08-Dec-20 03:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201208_123127-EE750.jpg 08-Dec-20 03:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201208_123135-B4C74.jpg 08-Dec-20 03:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201208_123309-11C49.jpg 08-Dec-20 03:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201208_123430-0D28C.jpg 08-Dec-20 03:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201208_123501-FC1DA.jpg 08-Dec-20 03:38 AM it's soo cuute 08-Dec-20 03:38 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201208_123956-D1AEF.jpg 08-Dec-20 03:38 AM so smol ❤️ 08-Dec-20 05:18 AM so big 08-Dec-20 05:18 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/DSC_8430-D890B.JPG 08-Dec-20 09:44 AM @GigaSquirrel What's that? Some photon-counting instrument? Or a more of a spectrometer? 08-Dec-20 09:59 AM it had some sort of sample holder and reflector, but no scintillator or similar, so my bet is on chemo- or bioluminiscense 08-Dec-20 10:01 AM Hmm, some 3M instrument 08-Dec-20 10:01 AM The pinout should be fairly easy to trace back and RE right? Because this sounds like a pretty good deal to me: https://www.ebay.com/itm/Hamamatsu-Photomultiplier-Tube-R3550A-07-C10940-53-High-Voltage-power-supply/233812425729 08-Dec-20 10:02 AM pinout of what? 08-Dec-20 10:03 AM Of this module, with the HV power supply and the PMT 08-Dec-20 10:03 AM ah, I got it for parts, mainly the hvps 08-Dec-20 10:04 AM No preamps on-board? 08-Dec-20 10:04 AM A picture of the underside of the PCB would be great to have! 08-Dec-20 10:05 AM few passives, fewer actives 08-Dec-20 10:05 AM haven't taken a good look at it yet, but it's all conformally coated do IDing those chips will be eh 08-Dec-20 10:06 AM Oh, gotta hate that... Several chips on the cryostat of my FLIR MWIR camera is also conformally coated, and it's so hard to ID them 08-Dec-20 10:06 AM I can only guess they are some sort of line-drivers or maybe even multiplexers from where they are located, but goodness knows who made them and what pin does what 08-Dec-20 10:09 AM rip 08-Dec-20 12:53 PM My wife just collected the mail. 08-Dec-20 12:53 PM “There’s something of pure terror for you!” 08-Dec-20 12:53 PM Me: “Fine, I’ll drink it all myself!” 08-Dec-20 12:53 PM Her: “Hey, I didn’t say that was a bad thing!” 08-Dec-20 12:53 PM After copious USPS delays, the mustachioed Goat of Science has arrived!!! 08-Dec-20 12:59 PM the what now 08-Dec-20 12:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-AFD79.jpg 08-Dec-20 01:00 PM ohh 08-Dec-20 01:00 PM want! 08-Dec-20 01:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-5548E.png 08-Dec-20 01:04 PM Ouch. 08-Dec-20 01:06 PM yes. 08-Dec-20 01:19 PM Yeah. 08-Dec-20 01:19 PM The reason why I haven't tried any. 08-Dec-20 01:27 PM one day...! 08-Dec-20 01:49 PM Man, I’m sorry it took so long. Enjoy the extra stickers. 08-Dec-20 02:04 PM Thanks, I will! 08-Dec-20 02:04 PM USPS has become pure evil as of late. I wasn’t sure it was going to arrive at all because tracking said: 08-Dec-20 02:04 PM “Your item was forwarded to a different address at [time/date] in CHICAGO, IL. This was because of forwarding instructions or because the address or ZIP Code on the label was incorrect.” 08-Dec-20 02:04 PM I knew the zip code was right, so I was wondering if a package thief fraudulently set up mail forwarding for me to intercept my packages. 08-Dec-20 02:04 PM That could result in an ironic surprise if a thief got a hold of that bottle without realizing how potent it was. 08-Dec-20 02:04 PM Especially since that bottle has maybe 2x the LD50 of caffeine. 08-Dec-20 02:04 PM Anyway, USPS seems to apply random states to packages when they can’t deliver on time. I’ve frequently had packages held at the post office at customer request when I never made such a request. But recently they said my mail was forwarded when it wasn’t. 08-Dec-20 02:19 PM really? 08-Dec-20 02:19 PM also - I wonder how long the coffee will last in transit 08-Dec-20 02:19 PM especially international shipments 08-Dec-20 02:37 PM Forwarding without your knowledge would be bad. Also, I suspect you know your own ZIP though typos frequently happen. 08-Dec-20 02:59 PM This is why all international shipments have to go express. 08-Dec-20 03:01 PM how many days does it last? 08-Dec-20 03:02 PM I would not guess during these times 08-Dec-20 03:02 PM Shipping from USA was 2weeks at best if via post and not like FedEx Express 08-Dec-20 03:02 PM That one, especially if with DDP so they dealt with customs was two days usually. 08-Dec-20 03:05 PM 10 days out of refrigeration is my quote. Past that point, flavor can start to turn. As far as shipping speeds, with the greatly diminished number of international flights, express isn’t quite as express as it used to be. Shipments still seem to be making it in under ten days, but not the five I was used to even to Australia. 08-Dec-20 03:34 PM Serious symptoms of overdose requiring hospitalization occur after 2000mg of caffeine. 100ml of Black Blood has about 1700mg. 08-Dec-20 03:34 PM hmmm... 08-Dec-20 06:32 PM And that bottle contains 1000 mL. 08-Dec-20 06:32 PM I know exactly what that stuff is.... I’m just thinking about what would have happened had someone stolen my mail who didn’t recognize the danger and drank it like it were normal cold brew. There may have been some poetic justice and a (very) dead ringer for a Darwin Award. 08-Dec-20 06:32 PM Fortunately for everyone, the bottle was not stolen; the USPS package tracking system merely assigns random statuses to packages they haven’t got around to delivering yet. 08-Dec-20 07:31 PM I’m saving up because I will need to make a big BBOTE purchase to justify the shipping cost to Australia. But then again I worked out what I spend each month for caffeine and caffeine accessories and it’s quite a lot 08-Dec-20 07:45 PM huh 08-Dec-20 07:45 PM why is 4L cheaper per unit than 12L 08-Dec-20 07:48 PM Is there a level at which caffeinated beverages require DOT hazmat regs? 08-Dec-20 07:48 PM How much do people typically consume in a serve? Even for heavy caffeine users ~10ml should be plenty 08-Dec-20 07:51 PM I thought the 50ml vials were a normal dose 08-Dec-20 07:51 PM not like a "have one in the morning, late morning, and afternoon" thing 08-Dec-20 08:47 PM I will, on the outside, do 50ml in the morning and a bit more in the afternoon. 08-Dec-20 08:52 PM is shipping 3x4L cheaper than 12x1L? 08-Dec-20 08:59 PM The postage? About the same. The supplies? Not so much. 08-Dec-20 09:31 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/signal-2020-12-08-205555-BFAE2.png 08-Dec-20 10:12 PM Welp I sorted it out --I started and stopped the oscillator 50,000 times without incident. But my startup behavior is really nonlinear, I get this funky low frequency envelope oscillation, which disappears by the end of the pulse. 08-Dec-20 10:12 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/signal-2020-12-08-205555-C19B6.png 08-Dec-20 11:46 PM So that’s approx 850mg caffeine?? That seems like a lot! 09-Dec-20 01:42 AM Bean madness! 09-Dec-20 05:38 AM That's some heavy tolerance 09-Dec-20 05:38 AM I remember how jittery I was after 750mg 09-Dec-20 05:38 AM Tho it was across 12hours, after being awake for 36hours on 60-90minutes of sleep 09-Dec-20 09:57 AM An average 500ml energy drink suck as rockstar (their zero carb stuff which I’m sure is killing me is a guilty pleasure of mine) has anywhere from 160 mg to 240 mg of caffeine and that’s enough to make question my life decisions! 09-Dec-20 10:30 AM The coffee culture in unversities was really bad for my health. Lost a blood vessel and some vision in one of my eyes as a result of it... 09-Dec-20 10:36 AM Damn 09-Dec-20 01:03 PM @adammunich is that an EKG of someone on BBotE? 5 MHz seems about right.... 09-Dec-20 01:05 PM this is me still trying to sort out my Transformer driver 09-Dec-20 01:05 PM I'm trying to make a resonant class D amplifier and it's pretty difficult 09-Dec-20 01:24 PM Doing some audio? 09-Dec-20 02:28 PM heh kind of, 60hz 09-Dec-20 02:28 PM trying to figure out how to do what enphase energy does but better 09-Dec-20 04:46 PM Freaky envelope looks like a reflection. Dampen with a reactive element? 09-Dec-20 04:46 PM Or notch it out. 10-Dec-20 06:39 AM Wow. That BBotE is amazing stuff! 10-Dec-20 06:39 AM We’re having construction done to repair water damage. Today they are starting on the closets. We were only able to finish emptying one of the three closets last night and were exhausted. 10-Dec-20 06:39 AM Do we push ourselves harder, or get up really early the next morning and each do 30 mL of BBotE? 10-Dec-20 06:39 AM We opted for the latter. 10-Dec-20 06:39 AM I am so impressed at how the acid and bitterness I’d expect in something that concentrated is just... not there! It tastes amazing! 10-Dec-20 06:39 AM And I don’t think we’ve ever been more efficient at home projects! Finished it easily with time to spare. 10-Dec-20 06:39 AM Me on BBotE: 10-Dec-20 06:39 AM https://twitter.com/catvibesto/status/1323347567309025280?s=21 10-Dec-20 06:39 AM Amazing stuff! Thanks! 10-Dec-20 06:39 AM Elizabeth: do I measure this with a pipette? 10-Dec-20 07:32 AM Ha, finally a situation where a mouth pipette wouldn’t be tooooo bad 10-Dec-20 09:21 AM I forgot to tell you to lay out your projects in advance beforehand, or perhaps you already had, but it seems to have worked out. 10-Dec-20 09:41 AM We already had laid the projects out. Everything went perfectly. Afterwards I felt like I needed to go run a marathon. Good stuff! 10-Dec-20 09:59 AM Burned some dust on a lens, oops 10-Dec-20 09:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-B9C6F.jpg 10-Dec-20 09:59 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-B922C.jpg 10-Dec-20 10:03 AM [pours one out for the poor optic] The fires were and continue to take a high toll on optics. We have so much crap in the air handling systems that it's like we stored up some August horrorshow for the whole rest of the year. I finally FINALLY got one group to actually cover their table when they weren't actively aligning. They were fairly disgusted by what landed on the lid just overnight. 10-Dec-20 10:10 AM We had a wall built through the lab 10-Dec-20 10:10 AM The construction plans had plywood on the “currently used as a lab” side 10-Dec-20 10:10 AM if I wanted crazy caffeine coffee, I think I'd just buy some purified caffeine powder and fluff up the normal coffee I drink 10-Dec-20 10:10 AM And drywall on the other 10-Dec-20 10:10 AM To avoid dust 10-Dec-20 10:10 AM Of course, the construction crew built it backwards 10-Dec-20 10:10 AM Despite having photos wit blueprints overlaid 10-Dec-20 10:12 AM Oof. Nobody was there babysitting...I mean supervising? 10-Dec-20 10:17 AM Reminds me of when one of the new professors here had to argue for ~20 hours over multiple weeks with the construction crew to explain why she really, really didn't want a door with a window for the laser lab. 10-Dec-20 10:36 AM We have windows on our doors 10-Dec-20 10:36 AM They’re blacked out of cours 10-Dec-20 10:36 AM But they’re there 10-Dec-20 11:12 AM Right, that's common, but you wouldn't put that door up if you were explicitly renovating the lab space to meet your needs. The contractor wanted to spend more money on a less functional door. 10-Dec-20 11:17 AM at least our newest door 10-Dec-20 11:17 AM has a lever instead of a knob 10-Dec-20 11:17 AM To go from my desk to turn a knob on my optical table 10-Dec-20 11:17 AM I have top open/close six doors 10-Dec-20 11:17 AM >.< 10-Dec-20 11:17 AM even though it's like 10m away 10-Dec-20 11:17 AM (there-and-back, 3 each way) 10-Dec-20 05:15 PM Pure caffeine powder is hard to buy now, there have been a couple people die from messing with it, both in Australia and the US. 10-Dec-20 05:52 PM It's really easy to get pills in the US at least 10-Dec-20 06:16 PM yeah lol 10-Dec-20 06:16 PM canada too. 10-Dec-20 06:16 PM I'm not sure if the people I know were getting it legally? but they were getting it easily 10-Dec-20 06:19 PM I found a 500 200 mg pill bottle for $18 on Amazon with 5 seconds of effort. I assume they would actually arrive/are legal 10-Dec-20 06:19 PM I'm pretty sure they're just in pharmacies too 10-Dec-20 06:19 PM Though I'm not sure because I try not to be THAT addicted to caffeine 10-Dec-20 06:21 PM is waiting for tea to steep 11-Dec-20 10:18 AM First result on google for me is 1kg of powder for $100 11-Dec-20 10:18 AM With free shipping 11-Dec-20 10:18 AM Seems easy enough @a_quiet_scientist 11-Dec-20 10:18 AM Also, since you changed you screen name here, I can't remember what you twitter handle is... Applied something (you show up in my stream there, but I'm afraid you've broken your syndication benefit) 11-Dec-20 05:53 PM My Twitter is @lukeweston 12-Dec-20 12:31 AM oh, hrmm, I guess you've reposted enough of @Applied_Ion stuff that I confused you! Oops! 12-Dec-20 02:19 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201212_021852-92AE3.jpg 12-Dec-20 02:19 AM Burt out sublimation pump makes nice copper wire mount 12-Dec-20 02:27 AM Uncoated grand fir needle, minutes after plucking from some boughs that I trimmed from our Christmas tree 2 weeks ago, and which I've been sitting outside since. I'm assuming the filamentous stuff is some fungi, and the vaguely circular things are the leaf's breathing pores (stomata) 12-Dec-20 02:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201212_022657-45C98.jpg 12-Dec-20 02:27 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/20201212_022819-EDF3A.jpg 12-Dec-20 05:11 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/PXL_20201212_120832076.MP2-5E4BA.jpg 12-Dec-20 05:11 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/PXL_20201212_120800825.MP-F86A1.jpg 12-Dec-20 05:11 AM So I think the stomata weren't as visible in the FIB due to the waxy cuticle 12-Dec-20 01:32 PM I can't exactly say why, but apparently I've started building a tiny pulsejet 12-Dec-20 01:32 PM tiny burn chamber 12-Dec-20 01:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-ECDD9.png 12-Dec-20 01:32 PM I'm not proud of my welding, but it holds 12-Dec-20 01:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-906F2.png 12-Dec-20 01:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-D9CDE.png 12-Dec-20 01:32 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-6F4F5.png 12-Dec-20 01:32 PM it will be valved, at the moment I'm missing some spring steel for the valve plate(?) 12-Dec-20 01:38 PM the more I see amateur welding 12-Dec-20 01:38 PM the more impressed I am with how our shop does it 12-Dec-20 01:39 PM Yeah, they look terrible, I have 10 hours or so of cumulative experience 12-Dec-20 01:39 PM Grinder and paint 12-Dec-20 01:40 PM Paint on a pulsejet? 12-Dec-20 01:41 PM well, mostly grinder in this case 12-Dec-20 01:42 PM A rotary welding table helps a great deal. Are you using a constant current welder? 12-Dec-20 01:42 PM I think it takes a lot of experience to master foot pedals well 12-Dec-20 01:42 PM Especially on thin sheet metal 12-Dec-20 01:42 PM So I started with constant current DC welders, learning how to feed by one hand, and got better results on steel tubes than using a much more expensive welder with foot pedals for current control 12-Dec-20 01:42 PM But then I'm still terrible, so don't listen to me I guess 12-Dec-20 01:44 PM The pictures are not@loading for me. I wanna see a handmade pulse jet 12-Dec-20 01:46 PM heh, I know the theory, just need to practice 12-Dec-20 01:46 PM https://twitter.com/GigaBecquerel/status/1337835348458688516 12-Dec-20 01:48 PM Hahahaha. V1 flying bomb 12-Dec-20 01:48 PM XD 12-Dec-20 01:49 PM They are very loud at the size most people build them 12-Dec-20 01:49 PM I wonder how yours will sound? 12-Dec-20 01:50 PM same 12-Dec-20 01:50 PM How about a U-tube valveless design? 12-Dec-20 01:50 PM Seems a lot easier to build if you are looking to do a speedrun! 12-Dec-20 01:50 PM I am kinda building it for new years eve, even if it just bangs and doesn't work it will be fun 12-Dec-20 01:51 PM @GigaSquirrel check oyt the tesla valve engines 12-Dec-20 01:51 PM valveless is easier, but way harder to get going in a small size, and storage is a major concern for me 12-Dec-20 01:52 PM How large in diameter do you need stock for the valve? 12-Dec-20 01:53 PM the burning chamber is 60 mm OD 12-Dec-20 01:57 PM At least that is in a reasonably easily purchased size of sheet for most thicknesses but I can't think of any materials you could really consistently get away with using that are in everyday things heh Probably gotta order that material 12-Dec-20 01:59 PM I just ordered a 100x500x0.2 sheet of spring steel, and I'll use tin snips to get a clover-like shape 12-Dec-20 01:59 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/unknown-AAFA4.png 12-Dec-20 01:59 PM similar to this 12-Dec-20 02:01 PM You can glue it onto a backing material and use a hacksaw/file to do that sort of work too. Those inside curves are hard with snips 12-Dec-20 02:01 PM fair 12-Dec-20 02:01 PM another issue I am still thinking about is how to seal between the Al valve block and SS tube 12-Dec-20 02:02 PM They are definitely the fastest option for roughing out shapes 12-Dec-20 02:02 PM Hm 12-Dec-20 02:04 PM I'm willing to bet an o-ring won't do it 12-Dec-20 02:04 PM Most pulse jets get glowing red hot so I am not sure that brazing would be an option even 12-Dec-20 02:04 PM well Al melts before it gets red hot 12-Dec-20 02:04 PM but I don't want a permanent connection 12-Dec-20 02:04 PM want to be able to replace the valveblock 12-Dec-20 02:05 PM Press fit with an aluminum sheet shim between the pieces? 12-Dec-20 02:05 PM You could just press it apart in the future if necessary 12-Dec-20 02:06 PM hmm 12-Dec-20 02:06 PM I have done that with soda can material before for temporary things if you thin it out a bit 12-Dec-20 02:07 PM yep 12-Dec-20 02:07 PM I'll see if it even needs a seal 12-Dec-20 02:07 PM Please take video 12-Dec-20 02:07 PM don't worry I will 12-Dec-20 02:07 PM maybe next weekend if all goes well 12-Dec-20 02:09 PM Propane fuel? 12-Dec-20 02:09 PM aye 12-Dec-20 02:09 PM I have a 5 kg bottle that needs to be emptied 13-Dec-20 07:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201213_162911-71109.jpg 13-Dec-20 07:47 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201213_162919-F5606.jpg 13-Dec-20 07:47 AM woo! 13-Dec-20 07:47 AM now only the valves are missing 13-Dec-20 06:31 PM That’s one of those exhaust pipe flame shooter things isin’t it? Hahaha. Brap p p p p p . 13-Dec-20 06:53 PM That's what I said! (And now really really want, to keep tailgaters off) 15-Dec-20 12:19 PM bellow movement works yaay:D 15-Dec-20 12:31 PM @verschrottix do you have enough force to counteract vacuum there?... 15-Dec-20 12:31 PM i think so 15-Dec-20 12:31 PM not with the stepper motor, but the mount itself 15-Dec-20 12:31 PM yes 15-Dec-20 12:31 PM i can't move anything by hand there even witch great force 15-Dec-20 12:32 PM yeah just beware the force over even a small 4" flange is quite big 15-Dec-20 12:34 PM yes but it's only like 14kg 15-Dec-20 12:35 PM 15psi x (2in)^2 x pi = 180 lb force ? 15-Dec-20 12:39 PM this isn't a 4" flange 15-Dec-20 12:39 PM 2.75"? 15-Dec-20 12:39 PM yes 15-Dec-20 12:39 PM I didn't notice it shrunk from left to right haha 15-Dec-20 12:40 PM haha:D 15-Dec-20 12:40 PM yeah left is the Jeol flange:D 15-Dec-20 01:16 PM That's some decent syringe 15-Dec-20 06:57 PM Any projects in mind for the CL spectrometer? 16-Dec-20 03:47 AM You mean the spectrometer itself? 16-Dec-20 06:22 AM snagged a cool piece of kit off ebay: 3 axis Parker linear motor stage with 100nm encoders, servo drives and PSUs. Was originally going to assemble one myself from individual components, but then stumbled on this. Not terribly more expensive and all the hardwork already done 16-Dec-20 06:22 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/OPyzGZslUqz2XqK6F5LlNYZyOi2IHiDu2NF_hRbit7-4DC29.png 16-Dec-20 06:22 AM the z-axis is interesting. it's a stepper/ballscrew combo that drives a wedge at an angle. There are three sets of linear rails for the z-axis, a set on either side that is vertical (can just see it on the left), a set that is horizontal which the wedge rides on (bottom left corner), and a set mounted at 45 degrees which the upper platform rides on (between the horizontal rail and the ballscrew). Never seen a setup like that before 16-Dec-20 06:33 AM Gonna try making that sicm? 16-Dec-20 06:35 AM primary intended purpose is a laser direct write system... but i'm planning space for fun accessory experiments like sicm 16-Dec-20 08:04 AM I mean do you have any plans for what to use it on? 16-Dec-20 08:05 AM ah well yes several 16-Dec-20 08:05 AM first of all mineralogy my father uses my sem a lot for that 16-Dec-20 08:05 AM also for perovskite research as a new laser material 16-Dec-20 08:05 AM and well the rest is just for fun, the project itself 16-Dec-20 08:07 AM You're lucky it came with cables! 16-Dec-20 08:07 AM we have some pulsed valves from parker, and one of our controllers is so old that they don't have schematics for it lol 16-Dec-20 08:08 AM Also i'll try to built a time resolved Cl, high speed beamblanker with GaN halfbridge and streakcamera as the detector 16-Dec-20 08:08 AM SEMs are always a project into themselves 16-Dec-20 08:08 AM for sure 16-Dec-20 08:09 AM What's the purpose of time resolved cl? 16-Dec-20 08:09 AM Is there pulse shape effects associated with electron beam irradiation? 16-Dec-20 08:10 AM i need that for the perovskite research 16-Dec-20 08:10 AM as part of the characterisation of those semiconductor materials 16-Dec-20 08:10 AM it's like time resolved PL but i thought well it should also work with cl 16-Dec-20 08:11 AM Yeah it should be cool 16-Dec-20 08:12 AM the upper lifetime for example 16-Dec-20 08:12 AM since this will be in the order of ns 16-Dec-20 08:13 AM So is this one of those samples where you have 1 shot to capture it? 16-Dec-20 08:15 AM no, but everything is happening really fast and for lifetime measurments in need fast excitation 16-Dec-20 08:15 AM and also a really fast detector (Streak-camera) 16-Dec-20 12:15 PM One of the problems with having eclectic interests.... Sometimes people may think they intersect in ways that they don't. 16-Dec-20 12:15 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201216_134041-A633A.jpg 16-Dec-20 12:15 PM I have this feeling that people looking at this will not see the inner skeleton for an adorable BB-8 astromech, but instead might think it's the frame for a spherical multi point implosion device, and I just drilled the mounting hole for the external neutron source. 16-Dec-20 12:27 PM Oh did you buy that? 16-Dec-20 12:29 PM I just got invited here. Those are made like 5 min from my family home. 16-Dec-20 12:29 PM The company as named no longer exists, they make other stuff now I think. 16-Dec-20 12:29 PM The actual facility inside I have seen and it's an incredibly well-run place 16-Dec-20 12:36 PM This is my design 16-Dec-20 12:36 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG-20160507-WA0016-D5138.jpeg 16-Dec-20 12:36 PM Based on a really early version from James Burton 16-Dec-20 12:37 PM @Mason_Yu yes it's an injection molded kit. It bolts together and is super glued with metal disks that go in slots. 16-Dec-20 12:37 PM With modification for a stronger shell, much bigger batteries, and powerful DC motors for the flywheel 16-Dec-20 12:38 PM Oooh pretty 16-Dec-20 12:46 PM Looks a little like 16-Dec-20 12:46 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/HD.4G.053_10540204545-A207D.jpg 16-Dec-20 03:35 PM <𝓕ermion#6024> what are those bellows called? 16-Dec-20 03:35 PM <𝓕ermion#6024> @verschrottix 16-Dec-20 03:35 PM <𝓕ermion#6024> it looks like there's a special kind of bellows needed for translation 16-Dec-20 03:44 PM lesker has a writeup on it 16-Dec-20 03:44 PM edge-welded vs hydraulically formed 16-Dec-20 03:44 PM https://www.lesker.com/newweb/flanges/bellows_tubeend_edgewelded.cfm?pgid=0 16-Dec-20 03:44 PM they're much more expensive to make, but much more flexible. 16-Dec-20 03:44 PM cheap ones for port alignment + vibration damping, edge-welded for manipulation 16-Dec-20 03:49 PM <𝓕ermion#6024> I'd love to find bellows like that which would let me go a factor of 2 in length expanded to contracted 16-Dec-20 03:49 PM <𝓕ermion#6024> probably not feasible though. 16-Dec-20 03:49 PM <𝓕ermion#6024> wait no my bad, these go many times a factor of 2 16-Dec-20 03:49 PM <𝓕ermion#6024> what would be amazing is a sample-in-liquid probe that didn't require a pumped seal. 16-Dec-20 03:51 PM we have two 1D manipulators that use the edge-welded bellows 16-Dec-20 03:51 PM iirc it's around 3.5" to 5.5" overall length on one, and 4.5" to 8.5" on the other ? 16-Dec-20 03:53 PM <𝓕ermion#6024> I want one that goes from 30 to 60 in lolol 16-Dec-20 03:53 PM <𝓕ermion#6024> I imagine if I paid enough money I could have one. 16-Dec-20 03:54 PM they're just springs, you can put them in series 16-Dec-20 03:54 PM <𝓕ermion#6024> oh sure 16-Dec-20 03:54 PM Actually though 16-Dec-20 03:54 PM <𝓕ermion#6024> but it's 500 USD or so an inch. 16-Dec-20 03:54 PM we do have a really long one 16-Dec-20 03:54 PM like 40" 16-Dec-20 03:55 PM <𝓕ermion#6024> no kidding? 16-Dec-20 03:55 PM but it's not 1D 16-Dec-20 03:55 PM it does huge x/y and tilt too 16-Dec-20 03:55 PM and has sat on the shelf for a decade 16-Dec-20 03:55 PM <𝓕ermion#6024> huh... 16-Dec-20 03:55 PM Grad student on that project dropped out, shelf it goes 16-Dec-20 03:55 PM <𝓕ermion#6024> yeah I mean anything that long would require linear rails and a screw or something to constrain it 16-Dec-20 03:56 PM oh our simple ones are much more "robust" than the diy one shown here 16-Dec-20 03:56 PM here lemme find a photo 16-Dec-20 03:56 PM gah, why don't I? 16-Dec-20 03:58 PM <𝓕ermion#6024> all good either way 16-Dec-20 04:00 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-2682A.jpg 16-Dec-20 04:00 PM here ya go 16-Dec-20 04:00 PM so it has a big guide post 16-Dec-20 04:00 PM then has the lead screw in between that and another small lead post 16-Dec-20 04:07 PM <𝓕ermion#6024> that thing goes to 40 inches?! 16-Dec-20 04:36 PM nooo 16-Dec-20 04:36 PM that's the short type haha 16-Dec-20 04:41 PM <𝓕ermion#6024> ahh ok ok. 16-Dec-20 05:44 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201217_024351-9130C.jpg 16-Dec-20 05:44 PM hehe 16-Dec-20 05:44 PM nice 16-Dec-20 05:44 PM Need to wrap the ends with al an in the shelf it goes :D 16-Dec-20 08:58 PM Those guys are near me. I didn't know they made those. Cool 16-Dec-20 08:59 PM are ya new to vacuum haha? 16-Dec-20 08:59 PM yeah. 16-Dec-20 08:59 PM lesker are the thorlabs/digikey of vacuum 16-Dec-20 09:00 PM Didn't know. Now I do 16-Dec-20 09:00 PM There's a lot of world class specialty operations around me in Pittsburgh. I'm still learning some. 16-Dec-20 09:01 PM lesker have great customer service, good quality stuff, but are a bit expensive. 16-Dec-20 09:01 PM Vacuum stuff isn't normally related to what I make- but there are things within the scope I have a great deal of interest in. 16-Dec-20 09:01 PM So I may be odd here- but quite interested in what's here. 16-Dec-20 09:01 PM good to know 16-Dec-20 09:01 PM I'd be interested in crystal growth in a vacuum for sapphire, but I have no idea if anyone here deals in such exotic things. 16-Dec-20 09:01 PM I have a need eventually for sapphire in specific hues. And a reason to make my own. Too complex to go into for now. 17-Dec-20 03:55 AM the offer doesn't say much, does this look like metglass to you? https://www.ebay.de/itm/174098899138 18-Dec-20 06:23 PM Whoever you consider to be your nerd for a topic, rest assured that they have one of their own. While I'm all my friends' coin nerd, Philip Arnold is mine. Creating this collection was a work of love. https://twitter.com/funranium/status/1340116029930803201?s=20 18-Dec-20 10:40 PM hehe I found a photo of my table from december 2018 18-Dec-20 10:40 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/slowcentrifuge_2018_IMG_0290-24E60.JPG 18-Dec-20 10:40 PM and last month from basically the same angle 18-Dec-20 10:40 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/Screen_Shot_2020-12-18_at_10.42.16_PM-C68F2.png 18-Dec-20 10:40 PM cable mess 18-Dec-20 11:33 PM good lord 19-Dec-20 12:37 AM How long are those PVC foreline pipes? And what kind of pressure can you achieve backing your turbos? 19-Dec-20 12:37 AM I must recommend this to someone at work, we are spending way too much (imo) in KJL parts 19-Dec-20 12:37 AM On stuff like test stands and things thrown together quickly in house 19-Dec-20 03:24 AM @Mason_Yu if you search PVC in this server, you'll see @idmb previously stating: there are four 4" PVC lines that all run about 15m from one room to another 19-Dec-20 03:24 AM He actually replied to you with pump model and conductance too (though I didnt see final pressure) 19-Dec-20 03:24 AM I tried calculating PVC leak rate once and, maybe my numbers were bad, but it seemed pretty leaky 19-Dec-20 07:12 AM We do that for our roots backed diffusion. I can't remember the exact final pressure and I can't check until the new year because isolating for christmas, but I think it's around 20 mtorr iirc 19-Dec-20 09:10 AM Save me 19-Dec-20 09:10 AM They go down below 1E-2 torr, maybe ~8E-3, but under load it’s more like 5E-2 19-Dec-20 09:12 AM Ah I probably just have bad memory. I remember the pump type, but it's good to know an exact number 19-Dec-20 09:12 AM iGX600L 19-Dec-20 09:12 AM The conductivity of the pipes is closer to like 80L/s iirc 19-Dec-20 09:12 AM But we have four lines from the pump total 19-Dec-20 09:12 AM And the 600 was barely more expensive than the 100 19-Dec-20 09:15 AM This should still be better than nearly 5 meters of KF50 bellow hose 19-Dec-20 09:15 AM Oh yeah 19-Dec-20 09:15 AM Much better and cheaper, the only thing is flexibility 19-Dec-20 09:16 AM We used the medium duty pipes 19-Dec-20 09:16 AM Schedule 40 19-Dec-20 09:16 AM It’s like 4.5” od 4” id? We tried the drain pipe stuff, which is like 4.125” and 3.95” 19-Dec-20 09:17 AM And it's non-conductive too, which is good for testing on a deck floating at a high voltage 19-Dec-20 09:17 AM And it works fine, but eh. 19-Dec-20 09:17 AM How do I cable manage all this stuff 19-Dec-20 09:20 AM You could run cable trays overhead 19-Dec-20 09:20 AM But I don't think it's necessary in research applications 19-Dec-20 09:20 AM I think 80/20 sells a lot of cable management accessories 19-Dec-20 09:20 AM https://8020.net/finishingyourframe/cablewirepowermanagement.html 19-Dec-20 09:20 AM This would be good enough 19-Dec-20 09:23 AM We have cable trays for long runs 19-Dec-20 09:23 AM The three situations that are messy 19-Dec-20 09:23 AM 1. Going into a 19” rack 2. Around a vacuum chamber 3. Dangling around over optical tables 19-Dec-20 09:23 AM Idk. The gas lines are tagged and colour coded now... 19-Dec-20 09:27 AM The back of the 19" rack should have lots of points for cable management right? 19-Dec-20 09:27 AM There’s no back 19-Dec-20 09:27 AM It’s 4-sided 19-Dec-20 09:27 AM And it had to go semi in the way 19-Dec-20 09:27 AM So it’s cabled so that it can rotate around one corner of the vacuum frame 19-Dec-20 09:27 AM And it’s just a mess... 19-Dec-20 09:30 AM I just mean the back of whatever thing you put in that rack, unless in this case, there are cables that must go in from 4 sides. Why do you need to rotate this rack around your vacuum frame? What's on there? 19-Dec-20 09:35 AM It’s positioned behind the linear rails 19-Dec-20 09:35 AM If one wants to do something there, they have to move it 19-Dec-20 09:35 AM Specifically, removing the cold head 20-Dec-20 11:52 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_20201220_051148_354-5383D.jpg 20-Dec-20 11:52 AM A little bit crappy looking since i don't have access zo the cnc until next year but it will do the job 20-Dec-20 11:52 AM And of course i forgot the standby button 20-Dec-20 09:53 PM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/IMG_0894-1CAA2.JPG 20-Dec-20 09:53 PM On the subject of coins.... 20-Dec-20 09:53 PM I found these commemorative coins. Made from space flown aluminum by the Samara Industrial Complex, the company that makes the Soyuz capsules. 20-Dec-20 10:06 PM Christmas present for my wife. She has a soft spot for the space doggos. 20-Dec-20 11:41 PM Neeeeeeat 21-Dec-20 09:40 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-9A42D.jpg 21-Dec-20 09:40 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-DDF9B.jpg 21-Dec-20 09:40 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image2-4EE42.jpg 21-Dec-20 09:40 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-75943.jpg 21-Dec-20 09:40 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-F788D.jpg 21-Dec-20 09:40 AM A “Faith Hope Love” rollerball pen in antique copper finish for my Catholic sister-in-law, turned from olivewood harvested in Bethlehem. 21-Dec-20 09:40 AM This was finished with a walnut oil/shellac friction polish and a walnut oil + microcrystalline wax. 21-Dec-20 09:40 AM I was worried I might spontaneously combust from touching the wood and the crosses, creating a fire hazard in the makerspace wood shop, but that fortunately didn’t happen. 21-Dec-20 09:44 AM Mine is teak from the deck of the USS New Jersey. Once again, good olive wood from old trees in Palestine looks good. I have a cup I’m rather fond of from there. 21-Dec-20 09:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image0-8B4BC.jpg 21-Dec-20 09:44 AM Vacuum%20Hackers%20-%20Text%20Channels%20-%20show-and-tell%20%5B513120662756524044%5D.html_Files/image1-6234B.jpg 21-Dec-20 09:46 AM Nice. And what a coincidence. I believe you have the exact same fountain pen hardware that I bought for my other sister-in-law. I’m doing it in Birdseye maple. 21-Dec-20 09:47 AM It did look familiar. Yours has the added touch of love that you made it yourself. 21-Dec-20 09:48 AM Actually no, I think you have the Majestic. 21-Dec-20 09:48 AM https://www.pennstateind.com/store/PKMAFTP.html 21-Dec-20 09:48 AM She’s getting the Nouveau. 21-Dec-20 09:48 AM https://www.pennstateind.com/store/PKDBFBT.html 21-Dec-20 09:52 AM I believe you're right. The deck teak pen is loaded with Nikita Red ink from Noodler's for CORRECTING WITH COMMUNISM. I got told by students that using the Diamine Oxblood was too depressing as it looked like I'd killed one of their classmates and marked up their papers with their dried blood. 21-Dec-20 09:53 AM I’ve researched both of those inks. 21-Dec-20 09:53 AM It is a really comfortable pen. I hope your sister-in-law enjoys it. 21-Dec-20 09:53 AM I was planning on donating pens to a theater company that only does horror. 21-Dec-20 09:53 AM They used recycled wood for a set that they found in some basement, probably a hundred years old, which they claimed was haunted. I was hoping to recover some of that lumber. 21-Dec-20 09:53 AM And of course it would need something that looked like blood. 21-Dec-20 09:56 AM ...got a pic? I'm no carpenter but I'm a sucker for a nice piece of wood. 21-Dec-20 09:57 AM Unfortunately the theater company was in a leadership shuffle when I made the offer and it fell through the cracks. So I never got the wood. The play was a zombie western. 21-Dec-20 09:57 AM I have turned 3-7k year old Irish bog oak. 21-Dec-20 09:58 AM we have a bunch of teak furniture 21-Dec-20 09:58 AM that was built in mexico 21-Dec-20 09:58 AM by a friend of my uncle 21-Dec-20 09:58 AM he bought the wood in the US 21-Dec-20 09:59 AM That is F A N C Y. 21-Dec-20 09:59 AM and to import it to mexico... well, building shipping crates out of the lumber meant you didn't have to pay some special tax 21-Dec-20 09:59 AM @funranium, how did you get that teak? Did you turn it? 21-Dec-20 09:59 AM this is ~1960/70 or so 21-Dec-20 10:00 AM No, it was part of a kickstarter years ago. https://www.kickstarter.com/projects/1060627644/wood-that-went-to-war#:~:text=Done-,Wood%20that%20went%20to%20War%20%2D%20Pens%20made%20of%20WWII%20battleship,Battleship%20of%20World%20War%20II.&text=277%20backers%20pledged%20%2418%2C914%20to%20help%20bring%20this%20project%20to%20life. 21-Dec-20 10:00 AM my dining table is the most valuable thing in my 500sqft apartment, since it's just a 2.5'x5' solid slab of teak 21-Dec-20 10:00 AM from one tree, forever ago 21-Dec-20 10:01 AM There’s a whole cottage industry around making pen kits, razor kits, etc, that can be made by people with small lathes. 21-Dec-20 10:01 AM That is a lovely pen you have. 21-Dec-20 10:03 AM Someday I will inherit my mother's giant redwood burl coffee table. It will instantly become the most valuable thing in my home. 21-Dec-20 10:04 AM is the coffee factoy home-based? 21-Dec-20 10:05 AM That is priceless. It cannot be compared to a mere table. 21-Dec-20 10:05 AM it kinda pains me that so many of the giant trees 21-Dec-20 10:05 AM were just logged because it was efficient to get wood 21-Dec-20 10:05 AM they still... cut them up into small pieces 21-Dec-20 10:06 AM I have some stabilized maple burl that is sized for whiskey bottle stoppers. 21-Dec-20 10:06 AM rather than using them exclusively for massive beams and tables 21-Dec-20 10:06 AM imagine a lincoln-log style cabin but made of 1m diameter trees 21-Dec-20 10:07 AM I don't have to imagine it. 21-Dec-20 10:08 AM I got started in this after buying an English bog oak fountain pen at GenCon, then doing some research and realizing that anyone with a lathe and simple tooling can make them. 21-Dec-20 10:08 AM The best thing about redwoods is that it takes the better part of 300 years for a fallen tree to rot away. Those old cabins are still here. 21-Dec-20 10:08 AM I haven't seen any quite like that though 21-Dec-20 10:08 AM The makerspace already had a wood lathe, so I convinced them to buy the tooling needed for making pens. 21-Dec-20 10:09 AM oh the real cabins 21-Dec-20 10:09 AM that come up when I search "lincoln log cabin" 21-Dec-20 10:09 AM do not look at all 21-Dec-20 10:09 AM like the toy ones 21-Dec-20 10:09 AM for "lincoln logs" 21-Dec-20 10:10 AM I got handed some koa wood in Hawaii to mess with. Really need to do something with that.