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2013-09-23 02:08 <DocScrutinizer05> well, the latter is quite normal nowadays
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2013-09-23 03:51 <kristianpaul> ha nice (wheel), that remenber me a thermostate i saw recently :)
2013-09-23 03:53 <whitequark> so I've finally got around to bringing up these boards we made
2013-09-23 03:53 <whitequark> out of 5 boards we've tried to assemble, 3 lived
2013-09-23 03:54 <whitequark> out of these, two have dead displays, and the remaining one a broken button
2013-09-23 03:54 <whitequark> in other words, a totally normal batch :D
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2013-09-23 05:21 <wpwrak> maybe you should stop buying military surplus components :)
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2013-09-23 14:31 <wpwrak> grmbl. blackout .. again :(
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2013-09-23 15:14 <larsc> was wondering way I was only reading garbage, was sending a signal with the same frequence as the the ADC sampling rate, nobody beats nyquist
2013-09-23 15:14 <wpwrak> heh :)
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2013-09-23 18:39 <sendak> hi, anyone knows where to get a nanonote?
2013-09-23 18:42 <kyak> http://www.pulster.eu/index.html?nanonote.htm
2013-09-23 18:42 <kyak> you'd be lucky to still be able to get it
2013-09-23 18:43 <kyak> meaning i'm not pulster still has them
2013-09-23 18:43 <kyak> *not sure
2013-09-23 18:44 <sendak> thanks!
2013-09-23 18:44 <kyak> http://www.openmobile.nl/ - not sure about this one
2013-09-23 18:44 <kyak> but you might ask
2013-09-23 18:45 <kyak> np
2013-09-23 19:06 <wpwrak> interesting: someone figured out how to make stereolithography very inexpensive: http://www.peachyprinter.com/
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2013-09-23 19:22 <wpwrak> he needs to get an MCU, though :)
2013-09-23 19:29 <whitequark> really interesting
2013-09-23 19:46 <wpwrak> i wonder what effect creates the solidification. it can't be just light plus resin, since that would yield flakes on the top or maybe little fibers/sticks in the resin layer.
2013-09-23 19:48 <wpwrak> so the salt water must play a role in this. i wonder if it's chemical, optical, or maybe both.
2013-09-23 19:48 <wpwrak> i would suspect chemical
2013-09-23 19:53 <ysionneau> for those interested, the princeton university free course (coursera) about Computer Architecture is starting again this year today
2013-09-23 19:53 <ysionneau> https://class.coursera.org/comparch-002/lecture/index
2013-09-23 19:53 <ysionneau> for those who missed it last year :)
2013-09-23 19:53 <wpwrak> might be fun to find a cheap resin mix. one big problems of all those 3D printers is that you have only a small number of sources for materials. for stereolithography, that number tends to be one.
2013-09-23 19:54 <whitequark> wpwrak: (sources) as in vendors?
2013-09-23 19:54 <ysionneau> if you want, you can download the texts and videos automatically by using the coursera-dl tool (git clone git://github.com/jplehmann/coursera.git && cd coursera && ./coursera-dl -u login -p password comparch-002
2013-09-23 19:54 <ysionneau> </spam>
2013-09-23 19:55 <wpwrak> whitequark: yes
2013-09-23 19:57 <wpwrak> whitequark: because each has their own secret mixture. and then you have fancy chemicals that a) are expensive to ship around the globe, and b) may run into all sorts of export/shipping/import restrictions
2013-09-23 19:58 <whitequark> wonder if it's possible to develop some sort of "open-source resin"
2013-09-23 19:59 <wpwrak> maybe one could cook something with polyester resin. that stuff is very cheap and you can find it everywhere. you need something that sets off radicals when illuminated. that's called the "catalyst" (though, according to wikipedia, it doesn't work that way)
2013-09-23 19:59 <wpwrak> shrinkage, thermal runaway, etc., probably aren't much of an issue in such an application. the smell may still be, though.
2013-09-23 20:04 <wpwrak> anybody here who knows something about chemistry ? :)
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2013-09-23 20:09 <wpwrak> hmm, polyester resin .. 1.12 g/cm3. heavier even than heavy water
2013-09-23 20:13 <roh> wpwrak: crazy printer
2013-09-23 20:13 <roh> dead cheap concept.. but doesnt look that easy to use and run (reliably)
2013-09-23 20:13 <whitequark> wpwrak: i wonder how much is "something"
2013-09-23 20:15 <wpwrak> roh: it may not be so bad. you could calibrate X/Y by simply having two (or maybe more) marked points and manually tuning the volume such that the laser hits the point
2013-09-23 20:16 <wpwrak> roh: to calibrate Z, assuming you have uniform drops, you'd want a sensor to measure at least two (low) points of the fluid level
2013-09-23 20:17 <wpwrak> and maybe add an acceleration sensor to stop the laser when there is vibration
2013-09-23 20:17 <roh> wpwrak: something like that. atleast... anyhow.. nice demonstration of a lowest possible end
2013-09-23 20:17 <roh> still impressive
2013-09-23 20:22 <wpwrak> very. if we can find a resin, it may not be so hard to copy that design. considering the idea of using audio for control, maybe a (small) loudspeaker could provide suitable coils
2013-09-23 20:22 * roh is watching the madness-wake...
2013-09-23 20:22 <roh> http://istouchidhackedyet.com/
2013-09-23 20:23 <roh> there is a guy in #linuxcnc or #reprap who said its only 20-30$ per litre
2013-09-23 20:24 <roh> 50-60us$ a gallon afaik... the question is rather which exact resin you want. there are different ones by wavelength etc
2013-09-23 20:24 <wpwrak> (touch id) yeah :) impressively fast
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2013-09-23 20:26 <wpwrak> roh: i wonder how you make it solidify at the right place. well, thinking of it, you could actually do that at the top as well, not at the resin-water barrier.
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2013-09-23 20:27 <wpwrak> yeah. that's the most likely explanation. have a structure that's above the initial resin level. then add water until the resin starts to cover that platform. there, you begin lasering.
2013-09-23 20:27 <wpwrak> kewl. almost reverse-engineered it already :)
2013-09-23 20:31 <roh> yep.. you make 'support' struts to bind the object to the surface, which you cut up afterwards
2013-09-23 20:33 <wpwrak> yes, that too. but what i meant was the initial platform you start building on.
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