| --- Log opened Mon Jun 09 00:00:29 2014 | ||
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| nmz787 | welp apparently the hackaday raman spectrometer project hasn't actually been tested for signal yet, still cool, gave them some tips | 00:10 |
|---|---|---|
| entelechy | talking about diy raman spectroscopy? | 00:18 |
| entelechy | http://benkrasnow.blogspot.com/2013/05/intro-to-diy-raman-spectroscopy.html | 00:18 |
| entelechy | this guy has done a cool one | 00:19 |
| nmz787 | yep | 00:35 |
| nmz787 | i talked with him about it at maker faire | 00:35 |
| nmz787 | entelechy: specifically I was talking about hackaday.io/project/1279-DIY-3D-Printable-RaspberryPi-Raman-Spectrometer | 00:35 |
| nmz787 | it sounds like ben has done better results-wise so far | 00:36 |
| entelechy | yeah he calibrated it and whatnot | 00:36 |
| entelechy | guy works for valve software as their engineer-in-residence | 00:36 |
| nmz787 | nice but old digicams seem like they can be found worldwide in grey markets | 00:36 |
| nmz787 | rather than 3d printers | 00:36 |
| nmz787 | nah google now | 00:36 |
| nmz787 | no longer at valve | 00:36 |
| nmz787 | i met his dad | 00:37 |
| nmz787 | he came up to my booth for takeitapart.com and was telling me how his kid started by taking stuff apart | 00:37 |
| nmz787 | and then i asked what he did and if he mentored him and what his kid was doing now | 00:37 |
| nmz787 | and he replied he was ham radio guy,( so that set the stage enough for me), then he said his son had a ruby crystal laser at a booth just a few booths down from ours | 00:38 |
| nmz787 | and of course i'd already seen it and seen it was ben's booth by that time | 00:38 |
| nmz787 | so i knew immediately this was his dad | 00:38 |
| nmz787 | it was really cool | 00:38 |
| nmz787 | then went and talked to ben for a few minutes | 00:39 |
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| entelechy | ah right on | 01:06 |
| entelechy | yeah hes got a bunch of cool videos | 01:06 |
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| kanzure | nmz787: just because it's easy to repurpose stuff you already have doesn't mean you should do it | 08:50 |
| kanzure | nmz787: the idea is to make something repeatable that others can improve on if they choose to | 08:51 |
| kanzure | nmz787: not garbage dive for a one in a trillion part that nobody else will be able to acquire | 08:51 |
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| kanzure | here's someone that might be selling silver halide film or microfilm stuff: http://www.ilfordphoto.com/aboutus/page.asp?n=23 | 08:56 |
| chris_99 | ilford make nice produces, i use their 35mm b&w film | 08:57 |
| chris_99 | *products | 08:57 |
| kanzure | what's the resolution? | 09:00 |
| chris_99 | no idea sorry, the lp/mm or somthing you mean i guess? | 09:00 |
| kanzure | yes | 09:01 |
| kanzure | i was looking at their spec sheet/pdf thing and it doesn't mention it | 09:01 |
| chris_99 | hmm must be somewhere | 09:01 |
| ParahSailin | heh, transcriptic wants to talk to me | 09:25 |
| kanzure | take it and run | 09:25 |
| kanzure | i think they write in scheme | 09:26 |
| ParahSailin | where on gnusha do you keep transcripts? | 09:27 |
| kanzure | http://diyhpl.us/wiki/transcripts/startup-science-2012/max-hodak/ | 09:29 |
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| nmz787_i | dingo: around? do you know if wexpect uses a file for pipe file descriptors? i think my problem for stderr getting 'stuck' might have been too large a data without a newline to flush it (though I could be wrong) | 09:37 |
| dingo | around, not (yet) familiar with expect, but if your child process is writing *a lot* of data, and you are trying to 'child.expect()' something from it, the expect() method will contoniously read (and exaust) the child's stdout/err buffer until it finds it | 09:46 |
| dingo | in a pseudo-terminal (pty) stdout and err (and even stdin) are merged into a single file descriptor. I'm not as certain about wexpect, though. | 09:47 |
| dingo | but if you're not .expect()'ing something, or manually calling .read/.read_nonblocking(), then teh child process will fill its output buffer -- usually 512, 4096, or 65534 bytes, and then block | 09:47 |
| dingo | because he's calling sys.stderr.write('....') and the OS is blocking this call -- its stuck there | 09:47 |
| dingo | traditionally, in posix, you might be right about stdout -- it is line-buffered, and stderr is unbuffered -- sys.stderr.write('x') is immediately received by the parent process/terminal -- but sys.stdout.write('x') is not, until sys.stdout.flush() or sys.stdout.write('\n newline') happens | 09:49 |
| dingo | but really -- wexpect could be very different in these regards, i have not yet even begun to read its source code, but from the description, it implements an emulated console of its own for win32, so monsters there may be | 09:49 |
| nmz787_i | yeah been reading the source, can't really tell where it's getting its data from... but I got a lead that piping to a file might handle the blocking issue | 09:56 |
| nmz787_i | idk, i'll have to give it a try | 09:56 |
| kanzure | "Although it still supports lxc, docker now defaults to libcontainer ( https://github.com/dotcloud/docker/tree/master/pkg/libcontainer ), it's own container implementation." | 10:12 |
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| tomkinsc | paperbot: http://journals.lww.com/headtraumarehab/Abstract/2005/05000/The_CDC_Traumatic_Brain_Injury_Surveillance.5.aspx | 10:33 |
| paperbot | TypeError: descriptor 'find' requires a 'str' object but received a 'NoneType' (file "/home/bryan/code/paperbot/phenny/modules/scihub.py", line 55, in <lambda>) | 10:33 |
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| kanzure | like all engineering problems, this can be solved by submerging the whole machine i noil | 10:41 |
| kanzure | like all engineering problems, this can be solved by submerging the whole machine in oil | 10:41 |
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| nmz787_i | hi tomkinsc! | 11:02 |
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| kanzure | cold shoulder treatment | 11:22 |
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| kanzure | paperbot: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1242470 | 12:13 |
| paperbot | http://libgen.org/scimag/get.php?doi=10.1117%2F12.963734 | 12:13 |
| kanzure | are these new? http://magzdb.org/ ftp://libgen.org/pictures/ ftp://libgen.org/librusec/ http://libgen.org/biblio/batchsearchindex.php http://dc-poisk.no-ip.org/yndex.html http://dc-poisk.no-ip.org/ | 12:15 |
| kanzure | http://bookzz.org/ isn't. http://bookfi.org/ i forget if it's the same owner or not. hrm. | 12:17 |
| kanzure | ftp://libgen.org/librusec/Librusec/lib.rus.ec/ | 12:18 |
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| kanzure | (23 MB) http://liste.polymtl.ca/sympa/d_read/phy-mems/PartageInterne/Books/Rizvi2005HandbookofPhotomaskManufacturingTechnology.pdf | 12:33 |
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| kanzure | kodak still sells microfilm (800 lines per mm, so 1 micron resolution?) http://graphics.kodak.com/docimaging/uploadedFiles/d30.pdf | 13:13 |
| chris_99 | what are you planning to use it for? | 13:15 |
| kanzure | photomask | 13:15 |
| kanzure | really i think you can just take a picture on normal camera film, shine light through it, and get microstructures... | 13:16 |
| chris_99 | a photomask for what sorry? | 13:16 |
| kanzure | stuff, you know | 13:17 |
| kanzure | photomask for micron-resolution lithography (microelectronics, microfluidics, microwhatever) | 13:17 |
| chris_99 | aha | 13:17 |
| kanzure | paperbot: http://search.proquest.com/docview/275856268 | 13:18 |
| -!- sapiosexual is now known as sapiosexual|away | 13:18 | |
| kanzure | this seems like a cool group, http://www.ime.tsinghua.edu.cn/publish/wdzs/323/index.html | 13:29 |
| kanzure | .title | 13:29 |
| yoleaux | Institute of Microelectronics, Tsinghua University | 13:29 |
| gradstudentbot | I think the centrifuge is broken. | 13:29 |
| delinquentme | Not sure if you guys already know about this: https://www.indiegogo.com/projects/vocore-a-coin-sized-linux-computer-with-wifi | 13:30 |
| delinquentme | super small linux computer w wifi | 13:30 |
| chris_99 | oh yeah i've seen that, looks interesting, it's the MIPS one right | 13:31 |
| ParahSailin | yeah thats the top school there | 13:32 |
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| kanzure | why does the us army own patents? | 13:36 |
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| kanzure | ParahSailin: i'm trying to find tao deng <dengt@research.ge.com> 518-387-5473 518-387-7548 (emails are bouncing) | 13:41 |
| gradstudentbot | That's enzymatically impossible. | 13:44 |
| ParahSailin | hadn't thought about this, but snake antivenom is typically a polyclonal ab http://metronews.ca/health/3715/anti-venom-crisis-in-ontario/ | 13:49 |
| kanzure | "Layer by layer, the B9Creator uses the light from a Vivitek projector to cure photo-initiated resin rather than extruding plastic. It's similar to the Form1's stereolithography, but can print objects with an XY resolution of 50 microns and a Z resolution of 25 microns." | 13:52 |
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| kanzure | https://github.com/lansing-makers-network/buildlog-lasercutter-marlin | 13:57 |
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| kanzure | https://www.kickstarter.com/projects/b9creations/b9creator-a-high-resolution-3d-printer/posts/244460 | 14:02 |
| kanzure | hmm | 14:02 |
| kanzure | if these machines are really doing micron-resolution stuff, then why are there no microscope images of the work | 14:02 |
| kanzure | https://groups.google.com/forum/#!topic/muve-3d-support-group/rv0FJG5TXZU | 14:03 |
| kanzure | "0.0275 mm per step AKA the smallest definable distance the controller can command" | 14:03 |
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| kanzure | so 30 micron steps | 14:04 |
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| nmz787_i | here's the DMD direct write machine paper showing interpixel photoresist feature noise | 14:06 |
| nmz787_i | http://www.intelligentmp.com/Downloads/Technical%20Papers/SF-100%20Greyscale%20Paper.pdf | 14:06 |
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| nmz787_i | they have lots of other papers on their site too | 14:06 |
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| kanzure | jmil is focusing on large z height dlp printing, apparently | 14:21 |
| kanzure | he has expressed a disinterest in planar investigations of resolution | 14:21 |
| kanzure | also he has some photographs of the resolution here http://open3dlp.blogspot.com/2013/09/what-month.html | 14:21 |
| kanzure | ugh the dlp dev kit is very inconvienently priced. it means if i buy a few, i'm less likely to run into others that also have it and are willing to test/build with it. | 14:29 |
| kanzure | i wonder what's in the dev kit anyway. just the pcb? or are all of the other micromirror array devices locked down? | 14:31 |
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| kanzure | hm, so, i think it should be kept low-tech: uv/bluray led, projection of laser-printed transparency sheet, dlp stuff would be nice but if others build the device and end up with different projector equipment it will be annoying and intractable | 14:35 |
| kanzure | /win 6 | 14:37 |
| kanzure | fail | 14:37 |
| gradstudentbot | Are you published? | 14:37 |
| paperbot | RuntimeError: maximum recursion depth exceeded in cmp (file "/usr/lib/python2.7/_weakrefset.py", line 73, in __contains__) | 14:43 |
| heath | https://docs.google.com/document/d/17OTxjE5zl34VcXiAORayFOCDIkyRCiefh1ZBN1qEBUc/edit | 14:44 |
| heath | center for open science: strategic plan | 14:44 |
| heath | "6. Make all academic research discoverable and accessible" | 14:45 |
| heath | "5. Adjust incentives to make “getting it right” more competitive with “getting it published” " | 14:46 |
| kanzure | they are lying, they probably only mean the stuff they have access to (for #6) | 14:46 |
| heath | "4. Foster an interdisciplinary community of open source developers, scientists, and organizations." | 14:46 |
| heath | I'm not sure if #3 is possible | 14:47 |
| kanzure | this is not a plan | 14:47 |
| heath | "3. Join infrastructures to support the entire scientific workflow in a common framework" | 14:47 |
| heath | they are wanting me to review this and maybe make some suggestions on what possible projects i would work on if i joined them | 14:48 |
| kanzure | my review would be very negative and scathing | 14:49 |
| heath | :) | 14:49 |
| kanzure | top-down demands for "organizational synergy" are just not going to do anything | 14:49 |
| heath | I feel like it may be a decent framework for certain typing of researchers, but it seems like it could get in the way of other work | 14:50 |
| heath | s/typing/types | 14:50 |
| heath | iirc after a conversation with someone from there last year, version control to some people is saving a Word document with a new file name | 14:51 |
| heath | and i think this is their target audience right now | 14:51 |
| kanzure | huh, i didn't know about LCD projectors | 15:00 |
| kanzure | paperbot: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5351890 | 15:04 |
| kanzure | .title | 15:04 |
| paperbot | http://libgen.org/scimag/get.php?doi=10.1109%2FMHS.2009.5351890 | 15:04 |
| yoleaux | Development of the maskless photolithography device with an LCD-projector for fabrication of micropa... | 15:04 |
| gradstudentbot | The freezer was too cold and fucked up my sample DNA. | 15:05 |
| kanzure | here it is, | 15:07 |
| kanzure | http://diyhpl.us/~bryan/papers2/optics/photolithography/Second-generation%20maskless%20photolithography%20device%20for%20surface%20micropatterning%20and%20microfluidic%20channel%20fabrication%20(using%20an%20LCD%20projector).pdf | 15:07 |
| kanzure | "The fabrication of polyacrylamide (PAAm) micropatterns was performed with a 5x objective lens to adjust the final resolution to 2.5 microns/pixel, and the two-step procedure was employed as described previously.[10]" | 15:09 |
| kanzure | "For the fabrication of PDMS microchannels, a 3x objective lens was employed to adjust the resolution to 5 microns/pixel." | 15:10 |
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| nmz787_i | LCD still has interpixel dead zones | 15:46 |
| nmz787_i | I think the best bet is to trace with a laser | 15:47 |
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| kanzure | nmz787_i: i think the dead zones can be fixed using this method, | 15:54 |
| kanzure | http://diyhpl.us/~bryan/papers2/optics/photolithography/Development%20of%20microfabrication%20technology%20with%20maskless%20photolithography%20device%20using%20LCD%20projector%20-%20Itoga%20-%202010.pdf | 15:54 |
| kanzure | basically just have sub-pixel resolution motion to account for the dead zones | 15:55 |
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| nmz787_i | oh, yeah, sure, sub-pixel movement is gonna be real easy without a nanostepper | 16:37 |
| nmz787_i | :P | 16:37 |
| nmz787_i | i cant read that now | 16:37 |
| kanzure | you should double check whether or not that actually solves it | 16:40 |
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| nmz787_i | kanzure: well it probably would, but again, now we need some nanostepper | 17:06 |
| kanzure | you mean to say nanosteppers don't grow on trees? | 17:08 |
| delinquentme | what is nanostepper? | 17:08 |
| kanzure | it is a stepper that steps using nm | 17:08 |
| kanzure | *using nm steps | 17:08 |
| delinquentme | Sure I mean the implementation though. You're just using gearing and a typical stepper right? | 17:08 |
| kanzure | well that paper used one called "KY1250C-L" | 17:09 |
| delinquentme | hahahah | 17:09 |
| delinquentme | jesus. | 17:09 |
| kanzure | .title http://www.spectracore.com/KY1250CL.html | 17:09 |
| yoleaux | KY1250C-L Motorized Crossed Roller XY Axis 120x120mm Platform 50mm Travel Stage | 17:09 |
| kanzure | "Resolution: 0.05micrometer(1/20)" | 17:09 |
| delinquentme | Ehh itll work. | 17:09 |
| kanzure | 50 nm step | 17:10 |
| delinquentme | yeah its using gear boxes ... And its certainly pretty | 17:10 |
| delinquentme | But the connectors just scream "markup" | 17:10 |
| delinquentme | Y no 4 or 8 pin connections? | 17:10 |
| kanzure | who knows, i'm just quoting what the paper said | 17:12 |
| delinquentme | I'd guess they also sell just the mechanical stage | 17:12 |
| delinquentme | and depending on the application that could be easier if you just slap your own steppers in on it | 17:13 |
| kanzure | fenn's laser cutter design is 1.5875 microns per step | 17:13 |
| delinquentme | The biodome: http://www.ncbi.nlm.nih.gov/pubmed/20708956 | 17:14 |
| delinquentme | dude. fucking pig bladders | 17:15 |
| delinquentme | we throw that shit on EVERYTHING. Humans, horses , mice | 17:15 |
| kanzure | ugh "Since 2005,[7] the only remaining manufacturers of the LCDs for LCD projectors are Japanese imaging companies Epson and Sony." | 17:22 |
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| kanzure | oh, "According to electronics industry research company Pacific Media Associates, projectors using 3LCD technology comprised about 51% of the world's digital projector market in 2009.[2]" | 17:24 |
| kanzure | .wik liquid crystal on silicon | 17:25 |
| yoleaux | "Liquid crystal on silicon (LCoS or LCOS) is a "micro-display" technology developed initially for projection televisions but now used also in Wavelength Selective Switches, structured illumination and Near-eye displays." — http://en.wikipedia.org/wiki/Liquid_crystal_on_silicon | 17:25 |
| kanzure | did not know this "Texas Instruments' DLP (Digital Light Processing) relies on a spinning color wheel to reproduce images" | 17:29 |
| kanzure | makes sense though, since the mirrors need to reflect something | 17:29 |
| kanzure | i can't tell if that means lcd projectors are dying or not | 17:32 |
| chris_99 | laser projectors seem a cool idea to me | 17:32 |
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| kanzure | nmz787_i: so, the one reason to go with the LCD method is that the pixels are already pretty small. you only need a 2-5x objective as opposed to 100x plus oil immersion or w/e. | 18:47 |
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| nmz787_i | kanzure: but i'm saying get away from pixels altogether | 20:00 |
| kanzure | isn't a laser beam just a non-square pixel | 20:01 |
| nmz787_i | kanzure: binocular microscope, video in one ocular, laser in the other, bluray next to the objective too (so two write methods and a read method)... then have a laser printed grid of lines under the objective, use fast video camera to feedback for motion control of the stage and absolute positioning | 20:01 |
| nmz787_i | well except that when you drag it it, well, drags | 20:02 |
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| nmz787_i | so if the drag operation is relatively smooth, there is less interpixel noise | 20:02 |
| nmz787_i | fenn would say something about inertia smoothing things | 20:02 |
| kanzure | cannibalizing a microscope isn't a good idea- we should just buy the objectives and put it on the frame ourselves | 20:03 |
| nmz787_i | so maybe video would only be needed to calibrate once, in case of any large leadscrew errors or something | 20:03 |
| nmz787_i | or to watch for backlash | 20:03 |
| nmz787_i | a microscope is a microscope, i said nothing about cannibalizing there | 20:03 |
| nmz787_i | it will be harder to make a bino microscope though | 20:04 |
| nmz787_i | it would be much easier to outsource to some factory in china, my time is already pretty limited now | 20:04 |
| kanzure | why do you want binocular | 20:04 |
| nmz787_i | so you can have video and laser | 20:04 |
| kanzure | most people mean the eye-level thing when they say binocular | 20:04 |
| nmz787_i | no | 20:04 |
| nmz787_i | well | 20:05 |
| nmz787_i | i mean, yeah, there's a beamsplitter | 20:05 |
| nmz787_i | that has been hopefully finely and well adjusted | 20:05 |
| nmz787_i | (i used the word ocular, which is the eyepiece lense unit) | 20:05 |
| kanzure | "cannibalizing" means buying an existing microsocpe, removing its stage and replacing it with ours, etc. | 20:05 |
| nmz787_i | they might sell us a scope cheaper if we didnt want the stage | 20:06 |
| nmz787_i | idk | 20:06 |
| kanzure | and what's with the weirdo curved neck they all have, ugh | 20:06 |
| nmz787_i | why does it matter? | 20:07 |
| nmz787_i | you want it hooked up to internet anyway | 20:07 |
| nmz787_i | :/ | 20:07 |
| nmz787_i | does jules have any time? | 20:07 |
| kanzure | what does jules have to do with it? | 20:08 |
| kanzure | it matters because project repeatability | 20:08 |
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| kanzure | what's so bad about building a frame anyway | 20:08 |
| kanzure | you get to put everything where you need it instead of where it happens to be | 20:09 |
| nmz787_i | jules is pretty god with optics | 20:09 |
| nmz787_i | and he's local so that makes physical collab easier for a hardware project | 20:09 |
| kanzure | i think this is going to end up being like a single objective | 20:10 |
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| nmz787_i | right | 20:13 |
| kanzure | with the trifocal microscopes part of the problem is mounting your other equipment on that third ocular | 20:14 |
| kanzure | with your own design, you could make something more sane that isn't putting its weight on that vertical tube | 20:14 |
| nmz787_i | trinocular | 20:15 |
| kanzure | oh right | 20:15 |
| kanzure | not trifocal | 20:15 |
| nmz787_i | i said bino earlier | 20:15 |
| nmz787_i | FWIW the trinocular mounts are usually quite solid | 20:15 |
| nmz787_i | mounting onto the oculars is much more of a head-scratcher for me | 20:16 |
| nmz787_i | beacuse they're absolutely not made to be attached to | 20:16 |
| nmz787_i | i'd like you to find someone to improve that openlabtools CAD | 20:16 |
| kanzure | that just seems silly to me- i can't think of a situation where i wouldn't want to be able to attach things | 20:16 |
| kanzure | you mean someone to redo it? | 20:17 |
| nmz787_i | yeah and do any additions | 20:17 |
| kanzure | i was thinking of redoing them myself since i didn't like stl | 20:17 |
| nmz787_i | I'm not too quick with CAD stuff | 20:17 |
| nmz787_i | at least not the 3d printed stuff | 20:17 |
| nmz787_i | is that how you'd want this to be done, 3d printed? | 20:17 |
| kanzure | oof, i haven't thought about it | 20:18 |
| kanzure | is there any reason to go one way or the other | 20:18 |
| kanzure | besides cost | 20:19 |
| nmz787_i | structure, how much weight it can support | 20:19 |
| nmz787_i | flexibility | 20:19 |
| nmz787_i | don't want it twisting around and deforming with stress | 20:19 |
| nmz787_i | going out of calibration | 20:19 |
| nmz787_i | whatever that may or may not consist of | 20:19 |
| kanzure | oh right, weight.. let's estimate a projector is 5 kg at most | 20:20 |
| nmz787_i | i was planning on microstepping geared stepper motors | 20:20 |
| nmz787_i | there would be backlash | 20:20 |
| nmz787_i | but i think it should be pretty dang smooth travel | 20:20 |
| nmz787_i | (also I already have a working DMD with the light removed and have shined a laser into to get an image successfully) | 20:21 |
| nmz787_i | i found a decent laser seller on aliexpress | 20:21 |
| nmz787_i | basically a 405nm laser with a metal heatsink and adjustable glass focus lens | 20:22 |
| nmz787_i | like $40 i think | 20:22 |
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| nmz787_i | I never ordered it tho | 20:22 |
| kanzure | the gearbox stepper you wanted was NEMA 17? | 20:23 |
| kanzure | oh you can turn a NEMA 17 into a screw actuator | 20:34 |
| kanzure | .title http://www.pololu.com/product/2268 | 20:35 |
| yoleaux | Stepper Motor with 28cm Lead Screw: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase | 20:35 |
| kanzure | "The nut moves 8.0 mm per full revolution of the lead screw, which allows for a linear resolution of 0.040 mm per full step of the stepper motor. Even smaller step sizes can be achieved through microstepping, which is a feature of many bipolar stepper motor drivers. We recommend the DRV8825 stepper motor driver carrier for use with this stepper motor, which allows for a linear resolution of 1.25 µm per 1/32 microstep. However, please note ... | 20:36 |
| kanzure | ... that the nut is not spring loaded, so changes in direction will result in loss of positioning precision due to backlash." | 20:36 |
| kanzure | would moving forward more than you need be sufficient to eat the backlash? | 20:44 |
| kanzure | or would the microstepping still be off | 20:44 |
| nmz787_i | yeah you have to compensate for backlash | 20:49 |
| nmz787_i | which is why i was thinking live video of a grid reticle (laser printed checkerboard) | 20:49 |
| nmz787_i | blob tracking | 20:50 |
| nmz787_i | whether live or mostly calibration, idk yet | 20:50 |
| nmz787_i | i was thinking these to start out with, if it was just a microscope slide or piece of spin-coated silicon/glass http://robocraft.ru/files/datasheet/28BYJ-48.pdf | 20:52 |
| nmz787_i | i already have them microstepping with PWM with a 128 point sine lookup table | 20:53 |
| kanzure | .title http://liutaiomottola.com/Tools/Backlash.htm | 20:53 |
| yoleaux | Backlash in Lead Screws: What It is and What to do About It | 20:53 |
| nmz787_i | for an attempt to increase smoothness | 20:53 |
| kanzure | it mentions a software fix which is exactly my "eat the backlash" method.. so whatever. | 20:53 |
| nmz787_i | those motors are apparently from auto HVAC vent controls | 20:54 |
| nmz787_i | with a driver board and wires and connectors they're like $3 or $4 | 20:54 |
| kanzure | is that a 5.6 degree stepping angle? | 20:54 |
| nmz787_i | its less than 1 since its geared, then with the microstepping even more | 21:05 |
| nmz787_i | microstepping is basically free for smoothing the power out, but with all the gears and such, you need to do all the positioning based off the home/center point | 21:06 |
| nmz787_i | you can't say 50 microsteps to the right is 5 microns | 21:06 |
| nmz787_i | you'd need to ask how many microsteps is it to get 5 microns, from the calibration data, to know at that point on the stage, how many microsteps it will take to travel | 21:07 |
| kanzure | yep | 21:07 |
| nmz787_i | so again, the video | 21:07 |
| kanzure | would be nice to have a scalable number of oculars, based on adding mirrors or whatever | 21:09 |
| nmz787_i | kanzure: i guess you could start working from fenn's model, and redo the openlabtools augmentation | 21:09 |
| kanzure | augmentation? | 21:09 |
| nmz787_i | i think it might just be another of fenn's model rotated and added on | 21:09 |
| nmz787_i | well for the Z | 21:09 |
| nmz787_i | i dont remember how far along his model was | 21:09 |
| nmz787_i | that's why infinity corrected objectives are nice | 21:10 |
| nmz787_i | the only req is a 'tube lens' | 21:10 |
| nmz787_i | which I asked about here https://github.com/OpenLabTools/Microscope/issues/2 | 21:10 |
| nmz787_i | i bought a plano convex or two from ebay a while ago that were unused nice edmunds or thorlabs surplus | 21:11 |
| nmz787_i | I think it could probably be a smaller diameter | 21:12 |
| nmz787_i | and idk where a good new source is | 21:12 |
| kanzure | "Yes, sorry for the disorganised state of our wiki, with 5 people working on the project for 10 weeks we spent most of the time building and not enough time organising our work." | 21:14 |
| kanzure | why so many people?? | 21:14 |
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| kanzure | neat, there are gigahertz-range rf microfluidic antennas built with liquid metal | 21:43 |
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| kanzure | .title http://www.microfluidics.iis.u-tokyo.ac.jp/r09001.html | 22:09 |
| yoleaux | EO pump-based system | 22:09 |
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| kanzure | "This study reports the development of a prototype sheet-like soft actuator named a "microhydraulic actuator", which creates a 3D motion from a planar body with 2D fluidic channel patterns (Fig. A). In our proposed microhydraulic system, the miniaturized electroosmotic pumps (EOPs) as the pressure generating devices are embedded into the sheet-like body of the actuator for integration, miniaturization and low-power-consumption of the total ... | 22:11 |
| kanzure | ... system." http://www.microfluidics.iis.u-tokyo.ac.jp/r13013.html | 22:11 |
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| kanzure | microfluidic pump array instead of using a bunch of external syringe pumps http://www.microfluidics.iis.u-tokyo.ac.jp/r10001.html | 22:14 |
| kanzure | particle sorting by using surface relief structures http://www.microfluidics.iis.u-tokyo.ac.jp/r08004.html | 22:18 |
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| kanzure | yeesh this is a bulky microscope http://www.zeiss.com/microscopy/en_de/products/light-microscopes/axio-imager-2-for-biology.html | 23:02 |
| kanzure | multi-ocular microscope http://www.microscopesmanufacturer.com/product/COAXIAL%20MICROSCOPES/HL-54.jpg | 23:11 |
| kanzure | geeze they sell that for $9k? http://www.ebay.com/itm/Accu-Scope-3025-5-Head-Multi-Viewing-Observation-Teaching-Microscope-New-/261491632472?pt=LH_DefaultDomain_0&hash=item3ce21da958 | 23:15 |
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| kanzure | Todh5als: hi | 23:43 |
| Todh5als | hi, kanzure | 23:45 |
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