<wpwrak>
looks a bit diy-ish. but maybe it's not so bad. the "usb solution" sounds interesting
<hozer>
I've only been looking for about 15 minutes but it seems like the cnc3020 is a half-decent spindle and functional
<wpwrak>
it looks a log more solid, yes
<hozer>
and for ~600ish USD I could be milling PCBs
<hozer>
now, how can I get just the CNC part, no control box
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<whitequark>
wpwrak: double-sided tape? not nearly
<whitequark>
it absolutely doesn't cut it when milling out the PCB, and I'm not even sure about drilling
<whitequark>
and with stuff like acrylic sheets, holes are really the only way
<whitequark>
vibration + cutting force = displacement, always.
<wpwrak>
hmm, i fix my pcbs with tape all the time. no problem. tolerance is within about +/- 0.1 mm. that's for cutting the board and drilling. i etch the traces.
<wpwrak>
by the way, some of you may know / have heard of the ottawa linux symposium. that's one of the oldest and highest-profile linux-centric technical conferences. alas, their last conference caused some financial troubles and they're asking for help: https://www.indiegogo.com/projects/ottawa-linux-symposium
<whitequark>
wpwrak: 0.1mm is too bad already for drilling in my case
<whitequark>
and cutting board... maybe you have better tape than me?
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<wpwrak>
my tape is whatever they sell in the shop around the corner. i kinda doubt it's high quality :)
<wpwrak>
that's a stationary shop, so i
<wpwrak>
'm talking about thin tape. not the stuff you use, say, for glueing things to walls
<whitequark>
wpwrak: same
<whitequark>
it's some Scotch double-sided tape
<wpwrak>
should be more than enough. well, maybe you run your mill extremely fast and it just rattles the board too much
<whitequark>
what's your feedrate?
<whitequark>
I usually do about 200mm/min
<wpwrak>
(0.1 mm) my vias have a hole diameter of 0.254 mm and a copper diameter of 0.76 mm. so 0.1-0.2 mm total tolerance are quite okay. i tend to get a bit more error due to imperfect placement of the toner transfer sheet anyway.
<whitequark>
although I sorta shot myself through the leg here
<whitequark>
nothing glues to HDPE
<wpwrak>
;-))
<whitequark>
it's both a blight and a blessing
<wpwrak>
(feeed) good question :) all my scripts use "default values". should be around 2 mm/s
<whitequark>
so, 120mm/min. should be close enough
<wpwrak>
and the mill had a diameter of ~30 mil
<whitequark>
wpwrak: another thing I dislike tape for is that after 1-2 ungluings, it goes bad
<whitequark>
and it's pretty expensive, not to mention annoying, to replace often
<wpwrak>
oh, i use it only once
<whitequark>
and yet another thing is that if the PCB is slightly warped--even 1-2mm over the huge sheet--the tape is not enough to keep it flat
<wpwrak>
it's not meant for multiple use
<whitequark>
and that adds more error while drilling
<whitequark>
well
<wpwrak>
maybe you need a different kind of tape :)
<whitequark>
apart from CNC3020T's controller, I have an old PC with an LPT port with LinuxCNC
<whitequark>
your thing is a replacement for that PC, and it's a good idea to use it
<whitequark>
in fact, I might someday switch to that board
<hozer>
well, what I kinda really want is a single beaglebone cape that's got whatever that board has plus the controller
<whitequark>
that's an extremely bad idea
<hozer>
hah, noise?
<whitequark>
indeed
<whitequark>
I don't understand this obsession with PCB stacking...
<hozer>
the cape thing?
<whitequark>
cape/shield/whatever
<hozer>
its because everyone uses eagle with 2-layer limits
<whitequark>
huh?
<hozer>
well, actually, you can have a beaglebone which is umpteen layers, and make a simple 2-layer board that goes right on it
<whitequark>
it's a kind of extension headers
<hozer>
yes
<whitequark>
and extension headers are useful
<whitequark>
but there's no reason to try and fit *everything* on a single mile high PCB stack
<hozer>
I like the beaglebone the best of what I've seen (arduino, pcduino)
<whitequark>
beaglebone and arduino have different tasks though
<hozer>
no, that's why you need a single beaglebone + daughterboard that has the interface+controller
<hozer>
but mechanical wise, the beaglebone stacking just looks nice and seems pretty robust
<whitequark>
??? you don't need to
<whitequark>
just have two PCBs.
<hozer>
well, I want a CNC2030 controller for which I can mill the two PCBs I need to make another controller
<hozer>
and stack an arduino/pcduino/beaglebone on top of one of the PCBs and away we go, stand-alone linux CNC
<whitequark>
wait, you're the one who wanted to make a PoE-powered CNC controller?
<hozer>
;)
<whitequark>
whatever... continue. I'm not interested
<hozer>
I'm not going to run a 1kw VFD spindle on POE so I gave up on that
<hozer>
I guess I don't care how many boards it is, I just want to be able get a CNC mill that can mill it's own controller boards
<hozer>
so what's it take to replicate the actual controller part from the CNC you have
<whitequark>
there's a bunch of two-layer boards there
<whitequark>
the spindle PWM board is single-layer in fact
<whitequark>
it's not complex at all.
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<wpwrak>
mother nature's a bitch, evidence #392: have a few really warm days in winter so the wildlife releases its pollen and you get hay fever. then the temperature will drop and you'll get an evil mix of flu and allergy..
<wpwrak>
let's see if i've figured that evil plot well enough to avoid the mess this year ...
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<larsc>
going on a long vacation?
<wpwrak>
naw, taking anti-allergy pills
<wpwrak>
been near-dead for well over a month last year, when that mixture struck the first time. none of the normal anti-flu treatment worked ...