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2014-08-22 05:44 <wpwrak> whitequark: nice. drilling holes into the workpiece seems a bit wasteful, though. for PCBs, double-sided tape should be sufficient.
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2014-08-22 12:22 <hozer> wpwrak: hrrm, I'm obsessing over getting a CNC3020 now
2014-08-22 12:24 <wpwrak> was that for whitequark ? :)
2014-08-22 12:25 <wpwrak> and yes he's doing nice things with that mill. i'd be a bit concerned about all the bits he had to replace before it was usable, though
2014-08-22 12:26 <hozer> err, yes whoops
2014-08-22 12:31 <hozer> still looks better than stuff like this though.. http://www.mydiycnc.com/content/new-sprite-desktop-cnc-machine-turnkey-system
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2014-08-22 12:35 <wpwrak> looks a bit diy-ish. but maybe it's not so bad. the "usb solution" sounds interesting
2014-08-22 12:37 <hozer> I've only been looking for about 15 minutes but it seems like the cnc3020 is a half-decent spindle and functional
2014-08-22 12:37 <wpwrak> it looks a log more solid, yes
2014-08-22 12:38 <hozer> and for ~600ish USD I could be milling PCBs
2014-08-22 12:46 <hozer> now, how can I get just the CNC part, no control box
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2014-08-22 13:59 <whitequark> wpwrak: double-sided tape? not nearly
2014-08-22 13:59 <whitequark> it absolutely doesn't cut it when milling out the PCB, and I'm not even sure about drilling
2014-08-22 14:00 <whitequark> and with stuff like acrylic sheets, holes are really the only way
2014-08-22 14:00 <whitequark> vibration + cutting force = displacement, always.
2014-08-22 14:02 <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.
2014-08-22 14:06 <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
2014-08-22 14:23 <whitequark> wpwrak: 0.1mm is too bad already for drilling in my case
2014-08-22 14:23 <whitequark> and cutting board... maybe you have better tape than me?
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2014-08-22 14:24 <wpwrak> my tape is whatever they sell in the shop around the corner. i kinda doubt it's high quality :)
2014-08-22 14:25 <wpwrak> that's a stationary shop, so i
2014-08-22 14:26 <wpwrak> 'm talking about thin tape. not the stuff you use, say, for glueing things to walls
2014-08-22 14:26 <whitequark> wpwrak: same
2014-08-22 14:26 <whitequark> it's some Scotch double-sided tape
2014-08-22 14:27 <wpwrak> should be more than enough. well, maybe you run your mill extremely fast and it just rattles the board too much
2014-08-22 14:28 <whitequark> what's your feedrate?
2014-08-22 14:29 <whitequark> I usually do about 200mm/min
2014-08-22 14:29 <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.
2014-08-22 14:31 <whitequark> although I sorta shot myself through the leg here
2014-08-22 14:31 <whitequark> nothing glues to HDPE
2014-08-22 14:31 <wpwrak> ;-))
2014-08-22 14:32 <whitequark> it's both a blight and a blessing
2014-08-22 14:32 <wpwrak> (feeed) good question :) all my scripts use "default values". should be around 2 mm/s
2014-08-22 14:32 <whitequark> so, 120mm/min. should be close enough
2014-08-22 14:32 <wpwrak> and the mill had a diameter of ~30 mil
2014-08-22 14:33 <whitequark> wpwrak: another thing I dislike tape for is that after 1-2 ungluings, it goes bad
2014-08-22 14:33 <whitequark> and it's pretty expensive, not to mention annoying, to replace often
2014-08-22 14:33 <wpwrak> oh, i use it only once
2014-08-22 14:33 <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
2014-08-22 14:34 <wpwrak> it's not meant for multiple use
2014-08-22 14:34 <whitequark> and that adds more error while drilling
2014-08-22 14:34 <whitequark> well
2014-08-22 14:34 <wpwrak> maybe you need a different kind of tape :)
2014-08-22 14:34 <whitequark> I'm fine with my current setup ;P
2014-08-22 14:54 <hozer> whitequark: what controller do you use
2014-08-22 14:54 <whitequark> hozer: CNC3020T's own
2014-08-22 14:54 <whitequark> heavily modified, because it's shit
2014-08-22 14:54 <whitequark> see http://lab.whitequark.org/notes/categories/cnc3020t/
2014-08-22 14:55 <hozer> it was you or somene else I was reading about that blew it up in the first 20 minutes ;)
2014-08-22 14:55 <whitequark> me
2014-08-22 14:55 <hozer> what do you think of http://probotix.com/index.php?view=product&path=16&product_id=204
2014-08-22 14:55 <whitequark> that's not a controller
2014-08-22 14:56 <whitequark> apart from CNC3020T's controller, I have an old PC with an LPT port with LinuxCNC
2014-08-22 14:56 <whitequark> your thing is a replacement for that PC, and it's a good idea to use it
2014-08-22 14:56 <whitequark> in fact, I might someday switch to that board
2014-08-22 14:56 <hozer> well, what I kinda really want is a single beaglebone cape that's got whatever that board has plus the controller
2014-08-22 14:57 <whitequark> that's an extremely bad idea
2014-08-22 14:57 <hozer> hah, noise?
2014-08-22 14:57 <whitequark> indeed
2014-08-22 14:57 <whitequark> I don't understand this obsession with PCB stacking...
2014-08-22 14:57 <hozer> the cape thing?
2014-08-22 14:57 <whitequark> cape/shield/whatever
2014-08-22 14:58 <hozer> its because everyone uses eagle with 2-layer limits
2014-08-22 14:58 <whitequark> huh?
2014-08-22 14:58 <hozer> well, actually, you can have a beaglebone which is umpteen layers, and make a simple 2-layer board that goes right on it
2014-08-22 14:58 <whitequark> it's a kind of extension headers
2014-08-22 14:58 <hozer> yes
2014-08-22 14:58 <whitequark> and extension headers are useful
2014-08-22 14:59 <whitequark> but there's no reason to try and fit *everything* on a single mile high PCB stack
2014-08-22 14:59 <hozer> I like the beaglebone the best of what I've seen (arduino, pcduino)
2014-08-22 14:59 <whitequark> beaglebone and arduino have different tasks though
2014-08-22 14:59 <hozer> no, that's why you need a single beaglebone + daughterboard that has the interface+controller
2014-08-22 15:00 <hozer> but mechanical wise, the beaglebone stacking just looks nice and seems pretty robust
2014-08-22 15:00 <whitequark> ??? you don't need to
2014-08-22 15:00 <whitequark> just have two PCBs.
2014-08-22 15:01 <hozer> well, I want a CNC2030 controller for which I can mill the two PCBs I need to make another controller
2014-08-22 15:01 <hozer> and stack an arduino/pcduino/beaglebone on top of one of the PCBs and away we go, stand-alone linux CNC
2014-08-22 15:02 <whitequark> wait, you're the one who wanted to make a PoE-powered CNC controller?
2014-08-22 15:02 <hozer> ;)
2014-08-22 15:02 <whitequark> whatever... continue. I'm not interested
2014-08-22 15:02 <hozer> I'm not going to run a 1kw VFD spindle on POE so I gave up on that
2014-08-22 15:04 <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
2014-08-22 15:05 <hozer> so what's it take to replicate the actual controller part from the CNC you have
2014-08-22 15:06 <whitequark> there's a bunch of two-layer boards there
2014-08-22 15:06 <whitequark> the spindle PWM board is single-layer in fact
2014-08-22 15:06 <whitequark> it's not complex at all.
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2014-08-22 19:43 <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..
2014-08-22 19:48 <wpwrak> let's see if i've figured that evil plot well enough to avoid the mess this year ...
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2014-08-22 20:04 <larsc> going on a long vacation?
2014-08-22 20:07 <wpwrak> naw, taking anti-allergy pills
2014-08-22 20:08 <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 ...
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