<whitequark>
really, mining is not interesting anymore
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<larsc>
just start your own $COIN
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<pcercueiS2>
hey larsc
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<wpwrak>
larsc: in the last century you'd start your own religion / sect to get money and girls; these days, you start your own currency to get money; i guess in the next century you'll start your own own language and ... get nothing
<paul_boddie>
Maybe it can tell you more than I can manage to describe.
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<paul_boddie>
It's very simple by most CAD people's standards, but given that I hadn't used OpenSCAD before, I think I figured it out.
<paul_boddie>
The task of making anything from that model has yet to be attempted, though.
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<wpwrak>
a long time ago i did some experiments with it and had problems with coincident faces. basically had to add \epsilon to all the coordinates to make them overlap. not fun.
<wpwrak>
systems based on opencascade don't have that problem
<paul_boddie>
Yes, that's a known problem and perhaps the only infuriating thing I can think of.
<paul_boddie>
You get told about bad 2-manifolds, or something, and it doesn't tell you where they are!
<paul_boddie>
But it's less of a problem than one might think. Maybe they did some fixes.
<wpwrak>
then they'll serve the good sunday brew :)
<DocScrutinizer05>
((<nicksydney> wpwrak: in the next century you start selling cells :))) nah, virus that modifies cell dna the way you want, in only the cells you want, and is easily stoppable and even revertable (your blue skin prediction)
<DocScrutinizer05>
;-P
<wpwrak>
brought to you by Monsanto and TEPCO. Companies you can trust.
<larsc>
side effects may include swelling, nausea and death
<whitequark>
life: side effects include death
<wpwrak>
the final cure :)
<ysionneau>
nice, even a test rig
<larsc>
wpwrak: if you see it that way the fear of dying is kind of irrational, cause once you are dead you don't care anymore. One the other hand though if your genes didn't program you to avoid death you probably wouldn't be here in the first place
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<larsc>
in shool the teacher once asked what we think the purpose of life is. What I wanted to say is that purpose of life is life itself, what I said in my attemnt to condense it down to one word was 'reproduction'.
<larsc>
he didn't like that answer ;)
<lekernel>
http://ehsm.eu/ << just announced the first talks
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<wpwrak>
larsc: i can kinda see how all the girls in your class mentally moved some 10 m away from you :)
<wpwrak>
larsc: and no, the fear of dying makes perfect sense. but it also means that you shouldn't be afraid of it. well, not more afraid than of any other end of a universe.
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<rjeffries>
Is this similar to what wolfspraul was working on before he was abducted by aliens?
<rjeffries>
Yosys is the first step towards a fully open FPGA/ASIC toolchain, and is currently used with vendor place-and-route tools.
<larsc>
no
<larsc>
it's one or two layers above what wolfgang did
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<larsc>
this is synthesis, wolfgang was working on configuring the fpga
<larsc>
in the middle of those two is par
<rjeffries>
Do we know is wolspraul is still working in that area?
<larsc>
the project is on ice for an undefined amount of time
<rjeffries>
thanks larsc
<rjeffries>
Unrelated: the new RADXA dev board [uses Rock SOC] by Tom Cubie is shipping in small quanties. Early reports are positive. Impressive what one gets for $100.
<paul_boddie>
Does it have more than 1GB or will we have to wait for that Opteron A-series thing?
<rjeffries>
a small grace note is it ships with a decent looking plastic case. Also, placment of i/o ports is more sane than a certain high-volume, low-cost ARM board. In other words, i/o is on front and back, NOT all four sides.
<paul_boddie>
Presumably still arm32 and not arm64, then.
<rjeffries>
paul_boddie yes, correct. Not sure that matters a lot, but yeah, in another year or so that can be a valid next step.
<nicksydney>
wpwrak: what solder / station you use ? man your solder is 'clean' and smooth :)
<wpwrak>
not much else to see on the pcb ;-) it's completely passive, just traces and pogo pins
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<wpwrak>
well, and two spots where i over-etched and had to patch the traces :) the acid didn't want to work today. took forever to remove the large open spaces ... and attacked the traces while slooowly etching away at these areas
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<wpwrak>
just used a lot of flux. now mainly the one from chipquik.
<wpwrak>
(the ones i used before is no longer available so i have to transition soon to something else)
<wpwrak>
the nasty-looking contaminations are non-conductive. i used a bit of solder paste for the pogo pins and that leaves such residues.
<wpwrak>
the "vias" are in this case wires running at the bottom. didn't feel like doing the full two-sided process for just two traces
<wpwrak>
the black "scorch marks" in the middle are toner residues. would probably need some very nasty solvent to remove these. (i use paint remover for the toner)
<whitequark>
paint remover sounds like acetone, or maybe a shitty version of acetone. get a non-shitty one ;)
<nicksydney>
wpwrak: didn't read your reply :)...yes i have the same residue problem with my toner too
<whitequark>
interesting. so it seems to be dependent on the kind of toner. my toner was easily removed completely.
<nicksydney>
your non-copper board colour is different than mine...mine is like orangy-brownish kind of colour
<nicksydney>
yours like yellowish kind of colour
<whitequark>
wpwrak: by the way, why don't you mill your PCBs?
<wpwrak>
whitequark: it does remove the toner. but it also seems to help it get a little into the FR4. i've enhanced the contrast in the images so it looks a little worse than in real life.
<whitequark>
(toner removal) I usually left most of the copper on the PCB to spare etchant, so maybe that's why I didn't notice the smudge
<nicksydney>
whitequark: i have tried 3 different kind of acetone that i bought from pharmacy and none really helped to clean the toner smudge completely
<whitequark>
sounds quite likely
<whitequark>
nicksydney: from pharmacy? is it pure acetone?
<whitequark>
or something like nail polish remover?
<wpwrak>
(pcb color) pcbs can have all kinds of colors. this one is quite yellowish. i also have some unclad pcb that's basically white. i used that for the front cover of http://downloads.qi-hardware.com/people/werner/labsw/web/
<whitequark>
wpwrak: (mill) wow, your one sucks.
<wpwrak>
;-)
<whitequark>
0.2mm/s?!
<wpwrak>
that's not for the mill but for the piece
<wpwrak>
s/piece/bit/
<qi-bot>
wpwrak meant: "that's not for the mill but for the bit"
<whitequark>
hrm. I fed it at 250mm/min = 4mm/s
<whitequark>
ah, the bit
<wpwrak>
0.3 mm, and for the last one i used 0.5 mm/s
<whitequark>
g-wizard's feed and speed calculation suggests about 200mm/min for the 0.2mm endmill. we'll figure out soon whether that will break it
<wpwrak>
3 mm/s ? i see dead endmills ;-)
<whitequark>
I'm going to be using a TiAlN carbide endmill with 0.2mm dia and 0.4mm stickout
<whitequark>
perhaps the very low stickout contributes to the high feedrate calculated
<whitequark>
actually, wait, I think it's not the right term
<whitequark>
so it really doesn't get a lot of opportunities for breakage
<wpwrak>
famous last words :)
<whitequark>
hehe
<whitequark>
I've also been assuming I can take out just the copper, making a cut 0.04mm deep
<whitequark>
well, 0.05mm. it is theoretically within the machine's repeat positioning accuracy.
<whitequark>
the highest possible resolution based on stepper and ballscrew parameters seems to be 0.0025-0.00125mm, but I guess it's not very reliable
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<wpwrak>
how deep (nominally) did you mill ?
<whitequark>
this time? 0.2mm deep
<whitequark>
lemme take a picture
<wpwrak>
ah, that may explain why you succeeded. 0.2 mm gives you a lot of reserve.
<wpwrak>
of course, with boards going as thin as 0.4 mm, hrmm ...