#qi-hardware IRC log for Sunday, 2014-03-16

wpwrakmmh ?00:42
whitequarkDocScrutinizer05: (before KT-impact) hahaha13:19
Action: whitequark sighs13:50
whitequarkso I bought a power supply by LIHUA13:50
whitequarkwhich apparently doesn't make power supplies13:50
whitequarkit makes... copper anodes and CCA wire? wtf13:50
DocScrutinizer05whitequark: seems you survived yesterday's demo?15:47
DocScrutinizer05oops, today?15:49
DocScrutinizer05[2014-03-15 02:15:13] <whitequa1k> I'm pondering going there but not quite sure. people were beaten and imprisoned for months before...15:49
whitequarkslept right through it15:49
whitequarkI was nearly dropping dead from exhaustion yesterday :)15:50
DocScrutinizer05right, the only mammals surviving KT-impact were those that selpt it away15:50
whitequarkanyway I just fiddled with my CNC and added those two power supplies that have arrived15:50
whitequarkso I'm back to full warp drive^W^W spindle power15:51
DocScrutinizer05back to full 555-frying capacity15:51
whitequarkthey won't fit inside, so I fit them outside15:52
whitequarkworks pretty great. voltage is remarkably stable for cheap chinese supplies.15:57
DocScrutinizer05whitequark: nasty boy! black is L, not N ;-P16:22
whitequarkDocScrutinizer05: ouch16:23
whitequarkwell, it's not like it matters anyway. the plug can be plugged in any way around16:23
whitequarkthe mains plug that is.16:24
DocScrutinizer05:nod: sure16:25
whitequarkgrmbl. the Al bed has grooves too big for M4 bolts I bought for this purpose16:27
whitequarkand I thought I measured everything properly...16:27
whitequarkwell, I'm trying to fix victim plywood to the aluminium bed of my cnc16:34
whitequarkand bolts *almost* fall through the T-slots16:34
whitequarkclearly not wide enough to securely and properly fix16:34
DocScrutinizer05use washers16:37
whitequarkyep that works16:48
Action: whitequark is actually quite surprised he got that power supply mount right the first time16:53
whitequarkthis is first time in my life I use: wire clamps, bolt cutter, drill on something metallic, drafting of this kind, ...16:54
whitequarkand I only misplaced one hole by about 0.5mm16:54
wpwrakhint: for complicated manual drilling / cutting patterns, print the design on transparent film and use that as a guide / for marking16:57
whitequarkexactly what I did16:58
whitequarkwell, I rather printed it on paper and duct-taped that to the case16:58
whitequarkthen drilled right through it16:59
DocScrutinizer51PE film works great for avoisding scratches and marking the points for holes, and to somewhat keep drill from running away from point of hole17:12
DocScrutinizer51when you got no PE film, a paper sticky tape does17:14
DocScrutinizer51PE film works great for avoisding scratches and marking the points for holes, and to somewhat keep drill from running away from point of hole17:14
DocScrutinizer51and always use X shaped marks so you still see where the center of hole shall be even when you started drilling17:15
wpwrakyeah. film -> manual holes (with an awl) -> remove film -> drill is best. that way, the film doesn't crumple 17:31
wpwrakyou can also do it with paper, but it's harder to realign17:32
whitequarkwhy even remove paper?17:35
wpwrakbecause you don't want to damage it when working on the wood ?17:38
wpwrake.g., if you pass with a saw, the paper will be ripped apart17:39
wpwrakif all you do is drill small holes, you can probably leave it there, if firmly attached, but most other tools will shred it17:40
DocScrutinizer05nah, attach (protective) PE-film with marks. Drill. Remove film17:52
DocScrutinizer05the thicker the film, the better17:53
DocScrutinizer05sticky film of course17:53
DocScrutinizer05preferably (semi)transparent, though that's not mandatory17:54
DocScrutinizer05>>It is kind of sad, really, that people are so technically illiterate in a technological world.  We live in a Cargo Cult society, really, where a bunch of primitive apes run around examining the technological relics handed down to them by the Gods.<<17:59
DocScrutinizer05couldn't put it any better ;-P18:00
DocScrutinizer05alternative to PE: this paper sticky tape, made to get off easily after to painted your walls: http://www.bonum-werkzeuge.de/shop/tesa-krepp-4306-groesse-30-mmx50m-p-3224.html18:04
DocScrutinizer05s/ to pai/you pai/18:04
DocScrutinizer05for cutting stuff with pad saw (http://ecx.images-amazon.com/images/I/41b5-8M+vyL._SL110_.jpg) it's mandatory to protect your surface with either of both protective materials18:09
DocScrutinizer05unless your surface is irrelevant to begin with18:10
whitequarkDocScrutinizer05: ooh yes, masking tape. I have a roll18:26
DocScrutinizer05then you write proper cross-shaped marks on that paper. At least 20mm length for each line, so you *easily* can see if your drill is properly centered18:31
DocScrutinizer05even during drilling18:31
whitequarkwell the idea was to print the blueprint on paper18:31
whitequarkI don't think I can print on masking tape18:31
whitequarkI can print on self-adhesive paper but it's $$$ and then you have to get it off somehow18:32
DocScrutinizer05then use blueprint paper and transfer the marks from your template paper to the mask tape18:32
DocScrutinizer05s/blueprint/carbon copy/18:33
whitequarkwell... why not just fix the blueprint on workpiece?18:33
whitequarkdrilling won't tear it off18:33
whitequarkI mean, it did not18:33
DocScrutinizer05because it's not sticky18:33
whitequarktpe it over the edges18:33
DocScrutinizer05doesn't work. Never did for me18:33
whitequarkhmm, worked well for me. I missed that hole because I did not think it through and didn't make crosses like you suggest18:34
whitequarkrather I printed a hole as well18:34
whitequarkofcourse that made positioning very hard18:34
DocScrutinizer05the idea is that the tape is sticky to your object to drill at the point where drilling, so it guides your drill and holds it in place18:34
whitequarklolwat? a 50 micron tape will hold my 1.5kg hand drill in place at 1000rpm or something?18:35
whitequarka hole made with an awl, sure. tape? can't believe that18:35
DocScrutinizer05while a simple paper not only doesn't hold the drill in place but also gets destroyed when drill runs away18:35
DocScrutinizer05well, all I can say is: it works18:36
DocScrutinizer05the harder the surface you wanna drill (steel, glass) the more noticeable the difference18:36
whitequarkwell, I can try that surely18:36
DocScrutinizer05of course thick PE works better than thin mask paper tape18:37
whitequarkdefine thick?18:37
DocScrutinizer05and yes, for sure you should pre-pinch with an ale18:39
DocScrutinizer05or a hardened steel nail and hammer18:39
DocScrutinizer05and even _that_ is much easier to accomplish when you got some "soft" sticky protective material on top of your steel surface18:41
DocScrutinizer05actually humans are not made for dealing with surfaces as hard as steel18:43
DocScrutinizer05only CNC (usually) doesn't mind18:43
DocScrutinizer05try it and you'll get it what I'm talking about18:45
DocScrutinizer05drilling stuff like http://commons.wikimedia.org/wiki/File:Badezimmer.jpg you will *love* your masking tape18:46
DocScrutinizer05and don't ask me how many steel surfaces I ruined when drill ran away while drilling18:48
DocScrutinizer05won't happen when you "mask"18:48
DocScrutinizer05even when drill runs away, it's not damaging the surface18:48
DocScrutinizer05(1000rpm) you should start slowly, young padawan ;-)18:51
DocScrutinizer05muuuch slower than 1000RPM18:52
DocScrutinizer05...until you *fell* the drill found its place18:52
DocScrutinizer05don't tel me your drilling machine has no variable speed18:53
DocScrutinizer05stuff like that isn't sold anymore since it's basically unusable18:53
DocScrutinizer05probably even your CNC has a numeric (aka PC) control for spindle RPM for exactly this purpose to start drilling slowly18:59
whitequarkDocScrutinizer05: (1000rpm) I have no idea how fast is my hand drill actually19:21
whitequarkit's also graded in parrots19:21
whitequark(CNC) it actually did not have PC control for spindle out of the box, I think I told this story here already19:21
whitequarkbasically it had PWM output on control board with LPT and PWM in on spindle driver19:22
whitequarkall I had to do is to run two wires19:22
whitequarkhm, so G40 is simultaneously the gcode command for cutter radius compensation and ICD-10 code for epilepsy19:55
whitequarkchecks out19:55
DocScrutinizer05hehe, G40 sounds about right, yeah21:12
DocScrutinizer05yes, you told the details about spindle speed control21:13
whitequarkDocScrutinizer05: I don't think CNC needs to "feel" anything though21:35
whitequarkeverything I seen recommended just plunging into workpiece21:35
DocScrutinizer05(CNC needs to "feel" )you're mixing up cause end consequence21:41
DocScrutinizer05when you're supposed to start with slow drill speed until you notice drill "found it's place", this doen't mean CNC does need to notice anything since drill will "find its place" with or without anybody noticing21:43
whitequarkbut doesn't drill need to "find its place" only if you don't have rigid support while drilling?22:01
whitequarkand CNC is supposed to be rather rigid22:01
DocScrutinizer05yes, but end,ill/drill bit is flexible before it breaks22:01
whitequarktool deflection, right22:02
whitequarkwell, it probably only matters much for tiny drill bits22:02
whitequarkI made a hole!22:02
whitequarkwas not trivial at all22:02
wpwrak(find its place) i guess bit flexibility vs. hardness of workpiece. e.g., your wobbly 0.2 mm drills vs. steel should yield interesting but ultimately tragic results22:05
whitequarkI wonder22:06
wpwrakrelatively thin drills vs. copper (for my vias) work fine without further ado, though22:07
whitequarkyep, first thing I tested that .2mm drill at was copper22:07
whitequarkworks just fine22:07
wpwrakjust make sure the workpiece doesn't move. drills really hate that :)22:07
wpwrakmine (for vias) are 0.35 mm and seem to last forever, as long as i don't make any mistakes22:09
wpwrakof course, if i do, *snap*, there it goes ...22:10
wpwrakthe 1/8" endmill is great for making mistakes. i think it's stronger than any force my mill could produce :)22:11
whitequarkyep, 3mm is rather thick22:11
paul_boddieviric: Just tested gpg on the Ben NanoNote again. 4096-bit key generation works, but there's an excruciating wait for entropy.22:30
viricit's a rare operation though :)22:30
paul_boddieIf there's any readable documentation about writing entropy generation devices for the kernel, maybe post it here for curiosity/amusement.22:31
paul_boddieBut in case there was any doubt, gpg isn't too demanding on the Ben otherwise.22:32
paul_boddieAnd as I noted before, I get complaints about entropy on my desktop system anyway.22:32
viricvery good!22:34
viricthank you a lot!22:34
whitequarkDocScrutinizer05: well obviously this failed22:34
whitequarkargh, "use washers"22:34
whitequarkofcourse that didn't work, because if nut is too small for the slot, *it wouldn't lock in the slot*22:35
wpwrakviric: buy one atben and receive 2 MILLION true random bits per second FOR FREE ! ;-)23:17
wpwrak(in fact, you'll have a hard time to pull them out of the chip so fast. but you'll still be orders of magnitude faster than even your pc, with all its entropy sources)23:18
whitequarkCNC seems to have lost its mind23:21
whitequarkif I go higher in X, Y, Z then spindle works23:22
whitequarkif I go lower in -//- then spindle inexplicably loses PWM23:22
whitequarkhow is this even possible23:22
whitequarkmoreover when I turn spindle *off*, physically disconnecting its control circuit, it turns full-on for a sec23:24
wpwrakyour CNC mill - the gift that keeps on giving ;-)23:25
whitequarkI have this feeling I need to get rid of 555 in that circuit23:25
wpwrakyeah, raising that ancient corpse from the dead was probably a bad idea from the start ...23:27
whitequarkit doesn't even do anything now23:28
whitequarkit is basically supposed to act as a wire23:28
whitequarkand I suspect that it utterly fails23:28
--- Mon Mar 17 201400:00

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