--- Log opened Tue Feb 20 00:00:04 2024
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02:17 < fenn> a tasty self-fertilizing invasive duckweed https://theazollafoundation.org/azolla/the-azolla-superorganism/
02:44 < L29Ah> is anabaena edible?
02:50 < fenn> "Concerns about biomagnification exist because the plant may contain the neurotoxin BMAA that remains present in the bodies of animals consuming it and BMAA has been documented as passing along the food chain. zolla may contain this substance that is a possible cause of neurodegenerative diseases. Azolla has been suggested as a foodstuff for human consumption, however, no long-term studies of the
02:50 < fenn> safety of eating Azolla have been made on humans."
03:06  * L29Ah returns to his wolffia globosa reverence until further notice
03:08 < L29Ah> strangely i can't find neither wolffia nor lemna here though, hopefully it will get more abundant in spring and i'll be able to take samples
03:35 < fenn> P. luminescens is bioluminescent; however, the reason for this is not yet properly understood.
03:35 < fenn> It has been reported that infection by this bacterium of the wounds of soldiers in the American Civil War at the Battle of Shiloh caused the wounds to glow, and that this aided the survival of the soldiers due to the production of antibiotics by P. luminescens. This led to the phenomenon's nickname "Angel's Glow."
03:36 < fenn> (Protorhabdus luminescens)
04:35 < hprmbridge> kanzure> SF techno-optimist meetup https://partiful.com/e/6cM3NSxqKYlBn4la8QAS
04:37 < fenn> no date, time, or location. 194 going. hmm
04:37 < fenn> they must be very optimistic
04:38 < hprmbridge> kanzure> you don't need to have details when you have a crowd from that fast
04:38 < hprmbridge> kanzure> once there are details, it all collapses
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05:58 < hprmbridge> kanzure> 120 seconds is not that long to evaluate a CAD model object https://cdn.discordapp.com/attachments/1064664282450628710/1209499230087946240/text-to-cad-bot-demo.png?ex=65e724ef&is=65d4afef&hm=bee5535e572f2f4f5877868699a51c0a5e35a3eae99970a7e2b41e9a6a22fd6d&
06:00 < kanzure> "Concept for the real-time monitoring of molecular configurations during manipulation with a scanning probe microscope" https://pubs.acs.org/doi/10.1021/acs.jpcc.3c02072
06:01 < kanzure> "A self-replicating 3d printer" (2021) https://www.youtube.com/watch?v=B79FJWt8syY
06:04 < kanzure> rust-based CAD kernel https://github.com/ricosjp/truck
06:04 < kanzure> https://github.com/openvmp/partcad
06:05 < hprmbridge> kanzure> Babbage's mechanical notation for a differential engine printer https://cdn.discordapp.com/attachments/1064664282450628710/1209501118229643344/17_Flow_Notation.png?ex=65e726b2&is=65d4b1b2&hm=c13fe7814b74dfb432c3958b8be8aa5180b32348c905858cc82bb3b370fefc6f&
06:27 < fenn> calling bullshit on the self-replicating 3d printer
06:29 < fenn> the "data strip" is directly switching stepper motor phases, meaning a single part will have to be miles and miles of tape
06:32 < L29Ah> does it have tape polymerase?
06:34 < kanzure> "each TSMC wafer etched with bitcoin sha256d ASICs is one fewer floating point AI wafer for the paperclip hynodrone singleton"
06:34 < kanzure> *hypnodrone singletone
06:35 < L29Ah> silicon wars
06:36 < geneh2> I have that mechanical notation hanging in my office
06:38 < geneh2> you can find it at higher resolution on internet archive
06:38 < kanzure> do they have high res for all the babbage schematics?
06:38 < kanzure> like for his computer
06:39 < geneh2> for the difference engine I think so, the analytical engine's design wasn't finished though
06:41 < fenn> ok it's not quite as i described, "The data strip has columns and rows, where each row corresponds to a linear movement of the printer, and each column corresponds to one particular function of the data strip. Within each row, each column can be toggled on or off, and the distribution of “activated” columns encodes the rotation speed and direction for all of the motors on the printer"
06:42 < fenn> i'm not sure how it moves a precise distance with this scheme
06:44 < kanzure> geneh2: do you know
06:46 < geneh2> there's also a british museum that has digitized much of babbage's work
06:51 < fenn> slightly larger version of the diagram https://1.bp.blogspot.com/-JT-MMMnBCko/VHhfxmc7XdI/AAAAAAAACsM/IAThAgZPgFI/s1600/Ill_1_%2817_Flow%29_Notation.jpg
06:51 < fenn> from somewhere on https://blog.plan28.org/ an attempt to build an analytical engine
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06:51 < kanzure> discord bot only archives the discord images
06:52 < kanzure> hey where'd it go
06:52 < fenn> dunno
06:53 < fenn> what do i do
06:53 < kanzure> panic!!
06:53 < fenn> nah
07:05 < geneh2> I'll post the high res one later
07:05 < fenn> i wish internet archive would have some kind of indication that a book in the search results is not actually something you can read, or you have to log in, or whatever
07:07 < fenn> babbage's autobiography has titles for every single page rather than chapter titles. this is good.
07:11 < kanzure> just kill/reset the bot
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07:13 < fenn> i wanted to see if it would fix itself, but it didn't
07:14 < kanzure> bad bot
07:19 < fenn> it shouldn't be too hard to design a mechanical counter that matches binary strings, for stuff like "move this many steps in the +X direction"
07:20 < fenn> it's basically a clock with a dozen hands
07:22  * L29Ah punches fenn with a punched card
07:22 < fenn> 6 bits = 64 step commands ought to be enough for anybody!
07:24 < fenn> then you have one column for advance Z axis, another for start extruder, and i can't think of anything else really
07:26 < fenn> if there are lots of special functions like this, you could encode each function as an op code
07:26 < fenn> i don't see anything like this on brian minnick's project
07:27 < geneh2> relay reprap had a nice way to make a minimalistic controller: https://hackaday.io/project/11914-relayreprap
07:28 < fenn> it probably makes sense to have the extruder run in steps synchronized with the x and y axis motors
07:28 < fenn> i was thinking electronics are too much hassle and pneumatics would be easier to build
07:28 < fenn> uh, electrics
07:30 < L29Ah> pneumatics is a lot of hassle due to tight sealing requirement, better stick to rigid mechanics
07:30 < fenn> well something has to be the prime mover
07:30 < fenn> i guess it could be belt driven...
07:31 < L29Ah> or chain, or gear, or shaft...
07:31 < fenn> sure
07:32 < fenn> but then you're dealing with slip clutches and dogs which would wear heavily if made from typical crappy 3d printed plastic
07:33 < fenn> how do you turn a constant rotating shaft into an integer distance?
07:34 < fenn> i was imagining something like a clock escapement being advanced by a diaphragm / bellows
07:34 < fenn> puf puf puf puf ratta ratta ratta ratta 
07:35 < fenn> restricted to 45 and 90 degree moves
07:35 < kanzure> use the rotation to rotate a toothed bar rack?
07:36 < fenn> how do you start and stop the rotation tho
07:38 < fenn> differential drive can give more precision than the smallest step distance, if you can figure out how to make gear racks of arbitrary pitch or gears of arbitrary integer number of teeth
07:38 < fenn> it's sort of like a vernier caliper
07:39 < fenn> this doesn't solve the accumulation of errors over generations, just precision
07:39 < kanzure> where is xentrac when you want him
07:41 < L29Ah> typical crappy 3d printed plastic can't print typical crappy 3d printed plastic anyway
07:42 < fenn> https://www.oldbookillustrations.com/site/assets/high-res/1840/differential-screw-rawscan.jpg like this but with two linear ratchets instead of two screws (the screws are of different thread pitch)
07:43 < fenn> xentrac is probably taking a break from IRC
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07:46 < fenn> to move 0.1 step you move one step forward and 9/10ths of a step back at the same time
07:46 < fenn> there really aren't any good diagrams of this huh
07:51 < fenn> oh yeah the whiffletree thing in electric typewriters is good too: https://www.researchgate.net/profile/Giulio-Cerruti/publication/334694462/figure/fig69/AS:784732925218817@1564106317604/Differential-mechanism-configurations-at-each-experimental-test.ppm
07:52 < fenn> whippletree
07:53 < fenn> maybe we should call it a self replicating 3d typewriter instead...
07:55 < fenn> .t http://youtu.be/bRCNenhcvpw
07:55 < saxo> IBM Selectric Typewriter & its digital to analogue converter - YouTube
07:55 < EmmyNoether> IBM Selectric Typewriter & its digital to analogue converter - YouTube
07:59 < fenn> he only shows 2 bits but you can stack them indefinitely for more bits of precision. i'd use a flexure whiffletree to eliminate backlash
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20:24 < hprmbridge> geneh> here's the high resolution version of the flow notation diagram https://cdn.discordapp.com/attachments/1064664282450628710/1209717230795755560/17_Flow_Notation.jpg?ex=65e7eff7&is=65d57af7&hm=39acb80322cb065f4a5bda40444554570a7c353d8c0b55d1a341886d6b8344e8&
20:33 < hprmbridge> geneh> and some stuff which may help read it, but basically no one understands babbage's notation https://cdn.discordapp.com/attachments/1064664282450628710/1209719489936101426/TO01157442_TO0324_62167_000000_0004.jpg?ex=65e7f211&is=65d57d11&hm=f241dbccd5f422d8fd1ecb133fa24f54acb97e2375b7645a552cbc1a4be6c319&
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20:47 < fenn> thanks geneh
20:51  * fenn is reading https://fennetic.net/irc/stafford%20beer%20operations%20research%20society%20inaugural%20speech%20beer1970.pdf
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--- Log closed Wed Feb 21 00:00:05 2024