#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