<whitequark>
it's a massive pain, you need dedicated machines and tooling...
<whitequark>
(aluminium) well, sorta
<whitequark>
why not use brass?
<sb0>
well I just need to mill a small groove that doesn't need to be clean
<whitequark>
brass would be very easy to machine
<whitequark>
also, it is pure indium, correct?
<sb0>
yes
<whitequark>
melts at 156°C?
<sb0>
yes
<whitequark>
why bother with metal? just use HDPE. that's completely trivial then.
<sb0>
got some, or taobao order?
<whitequark>
get it from reclamation st
<whitequark>
or I guess I can, I was planning to go there soon
<sb0>
ok, thanks
<whitequark>
a bigger problem: my CNC mill needs an LPT port
<whitequark>
do you have a motherboard with that?
<sb0>
uh, no
<whitequark>
no, converters don't work, has to be a PCIe or native
<whitequark>
ok, I guess that hackerspace had some sort of mill then
<sb0>
can't we just reflash this thing?
<whitequark>
reflash?
<whitequark>
reflash what?
<sb0>
the cnc controller
<sb0>
it can't be that hard?
<whitequark>
it doesn't have any flash in it
<whitequark>
it has three stepper drivers.
<whitequark>
that's it.
<whitequark>
step+direction signals.
<sb0>
ok, so what's the problem with a usb/lpt converter?
<sb0>
timing?
<whitequark>
yes.
<whitequark>
it's not GPIO
<whitequark>
LPT is a ~100ns resolution 8-bit GPIO port, in practice
<whitequark>
the USB crap doesn't work with linuxcnc because it's not realtime, and you couldn't meet the timings even if you fixed that
<swivel>
FWIW any pre-lenovo thinkpad laptop (add xbase for the ultraportables) will give you a real lpt port, and they work well in linux, and are very cheap second hand.
<whitequark>
it seems stupid to buy a laptop just to make a groove in plastic
<whitequark>
sb0: what form do you have the indium now?
<swivel>
it sounds to me that you're buying a laptop to complete a cnc machine ;)
<whitequark>
are you aware that in 1-2mm thickness it has approximately the hardness of plastic cling wrap?
<whitequark>
i.e. it doesnt make a lot of sense to do casting with it, it will not retain shape anyway
<whitequark>
just make a strip from it and then bend it into the shape you need
<sb0>
I can probably find some pentium-3 clunker in the garbage
<sb0>
wire
<sb0>
and yeah, I noticed
<whitequark>
you need wire?
<whitequark>
you can get tin-indium preformed wire that i already have
<sb0>
I played with it already
<sb0>
no, it's wire right now
<whitequark>
oh
<sb0>
I want to use it to make a cf35-ish gasket
<whitequark>
okay, sure, let's go with that plan
<whitequark>
on your end, find that pentium 3 and install linuxcnc on it. you can also plug in the CNC mill as well, I don't think there's anything screwable up there
<whitequark>
the config is on lab.whitequark.org
<whitequark>
I'll go to reclamation st today and fetch that HDPE then. I need to get a package first, so not right now
<sb0>
ok, no hurry
<sb0>
I have a pile of other things to do as well
<whitequark>
ok
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<sb0>
their gate fidelity is lousy, but they've made a good interface and tutorials
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<mumptai>
hi
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<mumptai>
i'm looking for projects implementing dsp functions using migen, so far i came across rhino, timvideos (jpeg encoder), nist's dpq2 (a cordic implementation) and redpid (fast PID loop)
<mumptai>
what other projects are out there?
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<rjo>
sb0: which interface? quantumexperience? why is that good? and for whom?