2014-03-28 00:00 larsc has quit [Ping timeout: 252 seconds] 2014-03-28 00:01 larsc has joined #qi-hardware 2014-03-28 00:08 wej has quit [Ping timeout: 245 seconds] 2014-03-28 00:22 wej has joined #qi-hardware 2014-03-28 00:23 wolfspra1l has joined #qi-hardware 2014-03-28 00:23 rz2k has joined #qi-hardware 2014-03-28 00:26 wolfspraul has quit [Ping timeout: 265 seconds] 2014-03-28 01:17 wow, coolant is so awesome 2014-03-28 01:17 I decided I'll just fucking flood the entire area, and that worked perfectly 2014-03-28 01:18 I have a perfect mirror finish and only broken one endmill, and even that one because of stupidity 2014-03-28 01:26 :-) 2014-03-28 01:27 so you did my basin suggestion? 2014-03-28 01:29 http://imgur.com/a/pqSVl 2014-03-28 01:29 nope, simply poured water all over that 2014-03-28 01:29 btw it's not just cooling, it also acts as lubricant and transports away the dust 2014-03-28 01:29 one downside, now everything is covered with sludge and/or water 2014-03-28 01:29 and given that my table clamps and table are wooden... 2014-03-28 01:30 well, victim table 2014-03-28 01:30 wax goes a long way 2014-03-28 01:30 don't have any 2014-03-28 01:31 parafin oil 2014-03-28 01:31 neither that 2014-03-28 01:31 I think I have earwax but probably not enough to make a basin 2014-03-28 01:31 :p 2014-03-28 01:31 or simply parafin (candle) 2014-03-28 01:31 why the hell would I have any candles? it's 2014 2014-03-28 01:32 not for basin, to seal wood 2014-03-28 01:32 oooooh 2014-03-28 01:32 yes, good idea 2014-03-28 01:45 fuck. no. I did not figure it out. 2014-03-28 01:45 another broken endmill. 2014-03-28 01:46 fucking shit. 2014-03-28 01:58 it just occurred to me that the lateral force on the endmill bit is identical to the lateral force on the PCB 2014-03-28 01:59 when your clamps are a bit loose, it might move away PCB before endmill breaks 2014-03-28 01:59 if you even had sonsors there, dang nice stuff you could do 2014-03-28 02:00 s/son/sen/ 2014-03-28 02:00 DocScrutinizer05 meant: "if you even had sensors there, dang nice stuff you could do" 2014-03-28 02:01 350 devices, 400 donors, 73555 2014-03-28 02:01 ;-) 2014-03-28 02:01 aesthetic numbers 2014-03-28 02:02 though I wonder how the HECK somebody managed to donate 5 EUR 2014-03-28 02:04 atommann has joined #qi-hardware 2014-03-28 02:12 a diffusely symbolic token of appreciation :) 2014-03-28 02:13 what was the largest donation you received ? 2014-03-28 02:14 (endmill broken by stupidity) yeah, that's a common cause of death there ;-) 2014-03-28 02:19 (sensors) i don't think you want your clamps loose enough for anything like that to happen. loose workpieces give you all sorts of exciting new problems 2014-03-28 02:20 in any case, i'd try to work with lower feed rates. at those breakneck speeds, it's no surprise the endmills die like files 2014-03-28 02:24 dos1 has quit [Ping timeout: 240 seconds] 2014-03-28 02:29 rz2k has quit [] 2014-03-28 02:32 sooo... it seems the main reason is that at first pass, water simply disperses very quickly from surface of acrylic 2014-03-28 02:32 and later it tends to stay there 2014-03-28 02:32 so I changed initial depth to .5mm and pour a LOT of water right on endmill at all times while milling the initial groove 2014-03-28 02:33 thankfully there is nothing in my cnc that can rust! 2014-03-28 02:33 if you want to go the water route, you may indeed want to think of using a basin 2014-03-28 02:33 hah, final last words :) 2014-03-28 02:34 the wood will of course be useless in a basin, but you could just use acrylic as victim material 2014-03-28 02:37 mhmmm 2014-03-28 02:37 no, I just placed a lot of tissues under the machine 2014-03-28 02:37 ;-))) 2014-03-28 02:38 let's hope you're right about there being no parts that could rust :) 2014-03-28 02:50 btw, it's not like I *want* to use those breakneck feeds 2014-03-28 02:50 I have to, kinda 2014-03-28 02:50 roh_ is now known as roh 2014-03-28 02:52 nicksydney_ has joined #qi-hardware 2014-03-28 02:52 nicksydney has quit [Ping timeout: 255 seconds] 2014-03-28 02:53 obsessive-compulsive ? ;-) 2014-03-28 02:54 lol 2014-03-28 02:54 no, I mean at lower feeds acrylic really tends to accumulate on the endmill 2014-03-28 02:55 even with all the water ? 2014-03-28 02:55 yeah 2014-03-28 02:56 with my mill, most of it is reduced to powder. some strings may remain, but they just fall off after a while and don't get in the way 2014-03-28 02:59 do you use water? 2014-03-28 02:59 nicksydney has joined #qi-hardware 2014-03-28 02:59 naturally humidified air :) 2014-03-28 03:00 naturally ? 2014-03-28 03:00 nicksydney_ has quit [Ping timeout: 255 seconds] 2014-03-28 03:01 the air in buenos aires is usually fairly humid 2014-03-28 03:02 xiangfu has joined #qi-hardware 2014-03-28 03:12 http://i.imgur.com/cS7t0uy.jpg 2014-03-28 03:14 my powder is a bit more coarse. i don't think i have a picture from the middle of a run. have to take one the next time i mill something. 2014-03-28 03:24 arielenter has joined #qi-hardware 2014-03-28 03:31 arielenter has quit [Ping timeout: 265 seconds] 2014-03-28 03:32 xiangfu has quit [Ping timeout: 252 seconds] 2014-03-28 03:34 xiangfu has joined #qi-hardware 2014-03-28 03:55 wpwrak: so I settled on 7000rpm 560mm/min for 1.2mm endmill 2014-03-28 03:55 (I broke all the smaller ones) 2014-03-28 03:55 it doesn't stress the endmill too much and leaves a really nice finish 2014-03-28 03:57 xiangfu has quit [Ping timeout: 240 seconds] 2014-03-28 04:02 michael_lee has joined #qi-hardware 2014-03-28 04:11 idundidit__ has joined #qi-hardware 2014-03-28 04:14 idundidit_ has quit [Ping timeout: 240 seconds] 2014-03-28 04:48 xiangfu has joined #qi-hardware 2014-03-28 05:03 xiangfu has quit [Remote host closed the connection] 2014-03-28 05:09 kanzure has quit [Read error: Operation timed out] 2014-03-28 05:30 atommann has quit [Ping timeout: 265 seconds] 2014-03-28 06:24 jekhor has joined #qi-hardware 2014-03-28 06:34 atommann has joined #qi-hardware 2014-03-28 08:07 pcercuei has joined #qi-hardware 2014-03-28 08:07 pcercuei has quit [Client Quit] 2014-03-28 08:07 pcercuei_ has joined #qi-hardware 2014-03-28 08:11 pcercuei_ is now known as pcercuei 2014-03-28 08:16 jluis has quit [Quit: Me'n vaig] 2014-03-28 08:54 (diffusely symbolic token) the funny part in it: you can only select multiples of 10.- 2014-03-28 08:55 (largest donation) 4k iirc 2014-03-28 08:56 (want clamps loose enough) this wasn't a suggestion but a assumption to develop a suggestion on 2014-03-28 08:57 jekhor has quit [Ping timeout: 265 seconds] 2014-03-28 09:04 (basin) you know those vacuum cleaners that have a combined vacuum and waterjet nozzle? does that give you some idea for alternatives to basin and lots of water? 2014-03-28 09:05 what became of your whistler tool? 2014-03-28 09:05 is that a vacuum that can cope with water? 2014-03-28 09:07 sth like this: http://www.certeo.de/nasssauger-und-industriesauger/kaercher-nass-und-trockensauger-nt-27-1-me-adv-m12355.html ? 2014-03-28 09:08 of course you as well could use a huge bottle with two pipes for in and out of air, to collect the water _outside_ of the vacuum cleaner 2014-03-28 09:10 then use sth like an medical infusion bag http://german.infusion-bags.com/china-comfortable_1000ml_medical_grade_pvc_infusion_bag_easy_hanging_dual_port_bag-924616.html 2014-03-28 09:10 fill it with water 2014-03-28 09:12 mount a 1mm syringe needle to the end of tube/hose and attach that to the spindle head/motor so it adds a constant tiny jet of water on the endmill, attach the vacuum hose next to it, so it will instantly suck up all the water from your acrylic surface - incl the acrylic dust 2014-03-28 09:16 you probably even could cut the end of the vaccum hose at a 45° angle so the end can hoover 1mm above the acrylic surface and the hose rises at 45° form surface. Then cut an aperture into the hose exactly above center of the ellipsoid footprint, where you insert the endmill and syringe needle 2014-03-28 09:18 the air flow inside that vacuum hose end will be perfect :-) some air from top along spindle axis, to blow away the water and slurry. And most air from circumference of hose footprint along acr. surface and going straigt up into the hose, taking all the water and slurry with it 2014-03-28 09:20 also the downward air along spindle axis will avoid any water creeping up the tool bit / spindle to the motor 2014-03-28 09:21 sounds like a mad useful extension for your CNC 2014-03-28 09:26 mth has quit [Ping timeout: 240 seconds] 2014-03-28 09:31 atommann has quit [Ping timeout: 252 seconds] 2014-03-28 09:44 atommann has joined #qi-hardware 2014-03-28 10:27 jekhor has joined #qi-hardware 2014-03-28 10:34 atommann has quit [Ping timeout: 255 seconds] 2014-03-28 10:40 mth has joined #qi-hardware 2014-03-28 10:44 mth has quit [Remote host closed the connection] 2014-03-28 10:47 mth has joined #qi-hardware 2014-03-28 11:05 valhalla has quit [Ping timeout: 264 seconds] 2014-03-28 11:10 jekhor has quit [Read error: Connection reset by peer] 2014-03-28 11:12 valhalla has joined #qi-hardware 2014-03-28 11:26 DocScrutinizer05: yes, that was the idea 2014-03-28 11:26 except for a first proto, I'll just make a small reservoir for collecting used coolant 2014-03-28 11:26 well... by the way 2014-03-28 11:26 I bought a centrifugal pump, it has a DC motor 2014-03-28 11:26 how do you regulate power of such beast? 2014-03-28 11:52 jekhor has joined #qi-hardware 2014-03-28 12:20 military-grade resistors ? 2014-03-28 12:26 hi 2014-03-28 12:50 wpwrak: do you are a expert in workqueue? :( 2014-03-28 12:51 s/workqueue/workqueues 2014-03-28 12:51 eintopf meant: "wpwrak: do you are a expert in workqueues? :(" 2014-03-28 12:51 and I mean linux workqueues 2014-03-28 12:51 ... 2014-03-28 12:54 rz2k has joined #qi-hardware 2014-03-28 13:10 jekhor_ has joined #qi-hardware 2014-03-28 13:10 jekhor has quit [Read error: Connection reset by peer] 2014-03-28 13:36 jekhor_ has quit [Read error: Connection reset by peer] 2014-03-28 13:42 hmm, what does an expert "in workqueues" do ? :) i have used them in the past. i don't use them often enough that i would get the API right from memory. 2014-03-28 14:12 Jay7 has quit [Ping timeout: 255 seconds] 2014-03-28 14:13 Jay7x has joined #qi-hardware 2014-03-28 15:45 wpwrak: no, I said "regulate" 2014-03-28 15:46 meaning, what do I do? limit voltage? limit current? 2014-03-28 15:47 could also just plug it in reverse (to somewhat reduce pumping power) 2014-03-28 15:48 both ? :) but yes, i'd adjust voltage and let current follow 2014-03-28 15:48 hmm. so, an LM317 2014-03-28 15:48 reverse thrust also sounds interesting, though. please make sure you include the audio track when you make a video of that :) 2014-03-28 15:49 audio track? what's about it? 2014-03-28 15:49 I've did reverse trust trick on this specific pump in the past, it's nothing special really 2014-03-28 15:49 it just works worse, and in this case that's exactly what I want 2014-03-28 15:49 oh, you mean constant reversal 2014-03-28 15:50 (lm317) maybe you could also cook something with a PWM. not sure. that's more DocScrutinizer05's domain. 2014-03-28 15:50 pcercuei_ has joined #qi-hardware 2014-03-28 15:50 well, I have LM317 on hand and don't care about power so... 2014-03-28 15:50 though, going from 24V to ~10V would dissipate some massive amount of heat 2014-03-28 15:52 btw, I bought sulfuric acid 2014-03-28 15:53 pcercuei_ is now known as zcrc 2014-03-28 15:53 steadily working your way up towards HCl :) 2014-03-28 15:53 pcercuei has quit [Ping timeout: 264 seconds] 2014-03-28 15:54 meh no 2014-03-28 15:54 I decided I will still etch with persulphate, but add a fishtank heater and aerator to it 2014-03-28 15:54 i'm already looking forward to the euphoric outburst when you finally get drunk enough to dare to try it ;-) 2014-03-28 15:54 at 50°C persulphate should work very well 2014-03-28 15:57 how to put a nail into the wall: method #1: place pointy end on wall, take hammer, hit non-pointy end a few times. method #2: fix nail with structure that's independent of building, lift building with crane, repeatedly move building sideways to make it bump into nail, release nail from fixture, return building to original position. 2014-03-28 15:58 why choose method #2 ? because you don't risk hitting your fingers with the hammer 2014-03-28 16:00 remind me again how do I avoid corrosion while storing and using HCl in a 20sq.m flat 2014-03-28 16:00 btw, i think the next nobel prize for literature should go to gcc. i asked it to make a little gpio-polling loop. instead, it wrote an epic poem about redundancy, inefficiency, and bloat ... 2014-03-28 16:00 with no balcony or a ventilation slot to attach to 2014-03-28 16:01 how about using two plastic containers ? one opening down, the other opening up. ventilate on open window from time to time to avoid excessive cl buildup 2014-03-28 16:02 constant maintenance or acidic corrosion, awesome choice 2014-03-28 16:02 (containers) the "airtight" type 2014-03-28 16:02 also do you know that HCl eats through plastic? 2014-03-28 16:02 well, you'll probably access it often enough that the maintenance will be quite implicit 2014-03-28 16:03 well, not technically "eats", it extracts the plastifier basically, and the base matrix becomes extremely brittle 2014-03-28 16:03 well, buy only a quantity you can reasonably expect to use within the next, say, 5 years 2014-03-28 16:04 last time it ate through bottle in 1 2014-03-28 16:04 get a real bottle :) 2014-03-28 16:05 maybe ask a chemist how they do it. they're probably a simpler way than what i'm describing 2014-03-28 16:05 or watch breaking bad 2014-03-28 16:06 and get ideas from there :) 2014-03-28 16:07 yeah, it may have "dual" uses when getting unexpected visitors 2014-03-28 16:09 ew 2014-03-28 16:17 arielenter has joined #qi-hardware 2014-03-28 16:19 arielenter1 has joined #qi-hardware 2014-03-28 16:21 arielenter has quit [Ping timeout: 240 seconds] 2014-03-28 16:37 panda|z has quit [Ping timeout: 268 seconds] 2014-03-28 16:46 panda|z has joined #qi-hardware 2014-03-28 16:56 arielenter1 has quit [Quit: Leaving.] 2014-03-28 16:57 arielenter has joined #qi-hardware 2014-03-28 17:14 kanzure has joined #qi-hardware 2014-03-28 17:15 zcrc has quit [Ping timeout: 264 seconds] 2014-03-28 17:37 (lm317) DC-motors you operate like buck converter, with FET based PWM and clamp diode 2014-03-28 17:41 HCL storage - baby simple: give it some victim material, probably weak NaOH solution enclosed in a sealed container together with the HCl bottle works just *great* 2014-03-28 17:44 ah yes. even easier. or maybe baking soda. not as aggressive as raw NaOH. 2014-03-28 17:44 jekhor_ has joined #qi-hardware 2014-03-28 17:45 CaOH 2014-03-28 17:46 you'll want wet phase 2014-03-28 17:46 dos1 has joined #qi-hardware 2014-03-28 17:46 hi dos1 2014-03-28 17:47 or stuff like Mg or Al 2014-03-28 17:47 isn't CaOH about as wet as NaHCO3 ? 2014-03-28 17:47 depends on how much water you add ;-) 2014-03-28 17:47 yeah :) 2014-03-28 17:48 but do you actually need to add water ? the Cl is likely to spend a lot of time buzzing around 2014-03-28 17:48 hello 2014-03-28 17:51 sure, but I tell you what I don't like about backing soda: the CO2 it releases. NaOH + HCl -> NaCl + H2O 2014-03-28 17:51 ah, i see 2014-03-28 17:52 CaOH alias chalk is probably the best 2014-03-28 17:52 yeah, if it really gets bad, the co2 could begin to act as a buffer. though i kind doubt whitequark would get near such quantities 2014-03-28 17:52 well Ca(OH)2 2014-03-28 17:57 yeah, sounds tame enough, including the CaCl2 you get in the end 2014-03-28 17:58 actually ... no, wrong reaction ... 2014-03-28 17:59 you get an explosive ;-) Ca(ClO3)2 2014-03-28 17:59 plus some CaCl2 2014-03-28 18:00 6 Ca(OH)2 + 6 Cl2 = 5 CaCl2 + Ca(ClO3)2 + 6 H2O 2014-03-28 18:02 huh?? 2014-03-28 18:05 you don't believe it ? 2014-03-28 18:05 where the heck is there any Cl2 ? 2014-03-28 18:06 it's that what escapes from the HCl ? 2014-03-28 18:06 HCl != Cl2 2014-03-28 18:06 http://de.wikipedia.org/wiki/Calciumchlorat 2014-03-28 18:10 well, whether HCl or H2+Cl2 escapes, you get some CaCl2 and maybe a bit of Ca(ClO3)2 2014-03-28 18:11 neither sounds overly worrying to me. it's not as if the quantities we're talking about were particularly large 2014-03-28 18:11 would be weird to get a pretty exlosive substance from every single vomiting on chalk 2014-03-28 18:12 and in case of a spill, it would be just CaCl2 (and H2O) 2014-03-28 18:12 prlly the Cro Magnon had already discovered the gunpower then 2014-03-28 18:12 happens to you often ? :) 2014-03-28 18:14 actually nope, I thinke last time I puked been last millenium 2014-03-28 18:14 but yes, it's probably HCl and not Cl2 that escapes 2014-03-28 18:14 due to a rotten ham on some pizza 2014-03-28 18:14 yum ;-) 2014-03-28 18:25 mhhh, yumyum noodles... 2014-03-28 18:25 however the feel like puking is more constant by the month recently 2014-03-28 18:26 ah, those soldering fumes ... 2014-03-28 18:26 * wpwrak nogs knowingly 2014-03-28 18:26 or, according to the old german proverb: "ich kann gar nicht so viel essen wie ich kotzen moechte" 2014-03-28 18:26 #s/nog/nod/ 2014-03-28 18:27 first finish neo900, then you can food-bounce all you want ;-) 2014-03-28 18:27 not cause of soldering, cause of other members of my species 2014-03-28 18:29 from an evolutionary aspect, we need another huge meteorite or a pandemic disease 2014-03-28 18:30 Malthusian catastrophe not happening fast enough ? 2014-03-28 18:32 whatever it is, it's already overdue 2014-03-28 18:46 random sidenote: funny name: "Steinunn Sigurðardóttir" 2014-03-28 18:46 ah yes, those icelanders 2014-03-28 18:47 yeah, those sons and dottiers 2014-03-28 18:48 greatly simplifies genealogy though 2014-03-28 18:48 I can already tell the "first" name of her father ;-) 2014-03-28 18:51 Also you never have to wonder if that's a male or female first name :-D 2014-03-28 18:51 arielenter has quit [Ping timeout: 240 seconds] 2014-03-28 18:52 annoying however gets the name plate on your family door 2014-03-28 18:52 use apartment numbers ? 2014-03-28 18:53 particularly when multiple generations live in one household 2014-03-28 18:53 e.g., in argentina, nobody puts a name on the door. it's all by address 2014-03-28 18:53 heh, I bet that has advantages 2014-03-28 18:55 add to that a lax registration office practice, and you're quite safe from unadvertised visits 2014-03-28 18:56 afaik in USA it's similarly lax, that's maybe one of the reasons why parking tickets are not on the owner but on the car 2014-03-28 18:59 well, there are those who visit robin hood style, taking from the (suspected) rich, giving to the self-identified needy. for these, name or number don't really matter. at least not the simpler ones 2014-03-28 19:03 sure. For those I had a few nice surprises installed when I'd live where you do 2014-03-28 19:04 you know, along the line P99 (actually not P9) 2014-03-28 19:04 cause of death: own booby trap :) 2014-03-28 19:07 arielenter has joined #qi-hardware 2014-03-28 19:27 arielenter has quit [Read error: Connection reset by peer] 2014-03-28 19:29 arielenter has joined #qi-hardware 2014-03-28 20:39 michael_lee has quit [Remote host closed the connection] 2014-03-28 20:58 adamone has joined #qi-hardware 2014-03-28 21:03 adamone has quit [Quit: Leaving] 2014-03-28 21:03 snufkintardis has joined #qi-hardware 2014-03-28 21:08 snufkintardis has quit [Read error: Connection reset by peer] 2014-03-28 21:09 snufkintardiz has joined #qi-hardware 2014-03-28 21:30 snufkintardis has joined #qi-hardware 2014-03-28 21:30 depends on your confidence in your own acting and in your projects 2014-03-28 21:33 snufkintardiz has quit [Ping timeout: 255 seconds] 2014-03-28 21:45 snufkin has joined #qi-hardware 2014-03-28 21:47 snufkintardis has quit [Ping timeout: 264 seconds] 2014-03-28 21:50 snufkintardis has joined #qi-hardware 2014-03-28 21:50 snufkintardis has quit [Read error: Connection reset by peer] 2014-03-28 21:53 snufkin has quit [Ping timeout: 252 seconds] 2014-03-28 22:23 yeah. i try to err on the side of caution, especially when it comes to designing deadly traps :) 2014-03-28 22:26 and if you know Dr. Strangelove, then you can also appreciate why MAD wouldn't be an effective deterrent 2014-03-28 22:54 sorry, the last one doesn't make sense to me, prolly because of me not really knowing "Dr. Strangelove" 2014-03-28 22:57 I tend to design such traps with at least triple ANDed trigger, with a unusual but loud and obvious warning on every single trigger getting pulled. A similarly unusual but fool proof big emergency stop button. And no instant deadly force, rather start with something that I'm even more immune against than most others: high voltage ;-) 2014-03-28 22:58 a very good first defense line is an electronic dog, loud and nasty, with the speaker right behind the door 2014-03-28 23:01 (Dr. Strangelove) ah, one of the best movies ever made. very nice pitch-black humor. 2014-03-28 23:02 (no immediate lethal force) ah, dragging out the experience. well, why not :) 2014-03-28 23:07 (loud) probably an evil growl and some snuffle like a grisly bear is more effective than loud barking ;-) 2014-03-28 23:10 make a little robot arm that scratches on the door, with tungsten claws :) 2014-03-28 23:11 180dB 8kHz is also quite effective 2014-03-28 23:11 (robot) lol - just thought about exactly same . At a height of at least 1.50m 2014-03-28 23:12 better 1.80m 2014-03-28 23:13 3s after the 8kHz attack, gas kicks in, all still in front of the door, when somebody tries to open it 2014-03-28 23:13 break it 2014-03-28 23:14 the arm would also be dual-purpose - if they get in, those tungsten claws could teach them the error of their ways 2014-03-28 23:14 yup 2014-03-28 23:14 tarantino style :) 2014-03-28 23:16 well, when somebody already got in, you can do only two things: knock them out for at least 30min, or lock them in for at least same time 2014-03-28 23:16 Jay7x has quit [Ping timeout: 255 seconds] 2014-03-28 23:16 Jay7 has joined #qi-hardware 2014-03-28 23:19 several kW of focused microwave energy might do 2014-03-28 23:19 or tasers 2014-03-28 23:22 sharks. with lasers. 2014-03-28 23:28 jekhor_ has quit [Read error: Operation timed out] 2014-03-28 23:58 hah