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2014-03-29 00:29 <wpwrak> wow, i'm good. implemented a little EP0 protocol on ybox, and it worked on the first try.
2014-03-29 00:30 <wpwrak> usb, where has all your fight gone ? it's not like you to give in without at least a night of struggle
2014-03-29 01:27 <DocScrutinizer05> USB lost patience, knowing about how long it had to wait for wpwrak's nights no arrive
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2014-03-29 02:55 <wpwrak> ;-)
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2014-03-29 11:04 <whitequark> fun fact
2014-03-29 11:04 <whitequark> HDPE has lower melting point than PMMA, yet is much easier to machine
2014-03-29 11:04 <whitequark> I guess because it's less hard → less friction → less heat
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2014-03-29 11:25 <DocScrutinizer05> HDPE?
2014-03-29 11:26 <DocScrutinizer05> the stuff coke bottles are nowadays made of?
2014-03-29 11:28 <whitequark> no, just the coke bottle caps
2014-03-29 11:28 <whitequark> coke bottles are PET
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2014-03-29 11:28 <whitequark> there are also some other containers made out of HDPE, e.g. flux
2014-03-29 11:29 <whitequark> http://imgur.com/a/W1c3W
2014-03-29 11:29 <whitequark> added a coolant pump
2014-03-29 11:30 <whitequark> *everything* is soaked in water
2014-03-29 11:30 <whitequark> I was prepared for whatever's under CNC to be soaked
2014-03-29 11:30 <whitequark> but
2014-03-29 11:30 <whitequark> turns out the pump literally leaks more than it pumps
2014-03-29 11:30 <whitequark> WTF, Voronezh factory
2014-03-29 11:30 * whitequark wonders if they ever heard of QA... guess not
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2014-03-29 11:47 <DocScrutinizer05> LOL
2014-03-29 11:50 <whitequark> don't repeat my mistake: no buying of russian-made components
2014-03-29 11:50 <whitequark> I swear, chinese ones are better
2014-03-29 11:50 <whitequark> they at least somewhat work most of the time
2014-03-29 11:51 <whitequark> that electrolyte acid bottle is covered in something oily
2014-03-29 11:51 <whitequark> *PLEASE* don't tell me it leaks too
2014-03-29 12:04 <larsc> the acid desolved the bottle
2014-03-29 12:21 <whitequark> nah that's unlikely
2014-03-29 12:22 <whitequark> the bottle is made out of LDPE or maybe MDPE
2014-03-29 12:22 <whitequark> either way, polyethylene is not in general dissolved by acids, except strong oxidizers
2014-03-29 12:22 <whitequark> and it has no plastifier for acid to absorb
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2014-03-29 12:42 <DocScrutinizer05> electrolyte bottle?
2014-03-29 12:43 <whitequark> yes
2014-03-29 12:43 <whitequark> it's an electrolyte for lead acid batteries → approx 30% H2SO4 plus some kind of deshittifier
2014-03-29 12:44 <whitequark> hopefully that doesn't interact in plating process or in fact enhances it, although I would still prefer pure acid
2014-03-29 12:54 <DocScrutinizer05> eeek
2014-03-29 12:57 <whitequark> maybe I can extract it
2014-03-29 12:57 <whitequark> hm... by distillation? though not sure I am aroused by a pot of boiling sulfuric acid somewhere in my house
2014-03-29 12:57 <whitequark> hard to say without knowing what exactly that additive is
2014-03-29 13:00 <whitequark> according to http://www.findpatent.ru/patent/226/2267191.html, one of the components could be diethylenetriaminepentamethylphosphonic acid
2014-03-29 13:04 <DocScrutinizer05> take care, buddy
2014-03-29 13:05 <whitequark> nah, I'll just use it as is
2014-03-29 13:06 <whitequark> seems like the additive is mostly fluorosurfactants, a few organic acids and a metal sulphate
2014-03-29 13:06 <whitequark> lead or cadmium, I *hope* it is lead
2014-03-29 13:07 <whitequark> or maybe it's just pure acid
2014-03-29 13:08 <whitequark> yep, vendor says it is pure acid
2014-03-29 13:08 <whitequark> good
2014-03-29 13:10 <DocScrutinizer05> is it *that* hard to get something simple like sulfuric acid in .ru?
2014-03-29 13:11 <DocScrutinizer05> I mean, stuff labeled as "pure sulfuric acid"
2014-03-29 13:12 <DocScrutinizer05> I dunno what's the situation now, last time I bought such stuff in next drugstore or pharmacy, but that's like 40 years ago
2014-03-29 13:14 <DocScrutinizer05> last chemical experiments (1kg of flash powder based on Mg an KMnO4) been with support of a friend who had a chemicals store
2014-03-29 13:14 <DocScrutinizer05> about 15 years ago
2014-03-29 13:15 <DocScrutinizer05> btw that was a pretty disappointing experience, mostly due to lack of a proper mill to crack the KMnO4 crystals into proper dust
2014-03-29 13:16 <DocScrutinizer05> probably should have tried some recrystallization
2014-03-29 13:29 <DocScrutinizer05> btw the "underwater thunderstorm" experiment is really cool ;-). You could aslo test your battery acid this way, I guess. layer some ethanol over sulfuric acid in a small test tube you better place into a huger water bath, then throw one crystal of KMnO4 into that
2014-03-29 13:31 <DocScrutinizer05> http://www.experimentalchemie.de/versuch-031.htm
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2014-03-29 13:52 <whitequark> DocScrutinizer05: yes, exactly that hard
2014-03-29 13:52 <wpwrak> keep on searching for the right formula. Pro Tip: if the patent application contains the string "stabilize with FOOD", then you're on the right track.
2014-03-29 13:52 <whitequark> there is 1 shop I found which will send dilute 15% acid to individuals
2014-03-29 13:52 <whitequark> and it only ships from SPb, which is rather inconvenient
2014-03-29 13:53 <whitequark> acids >15% aren't sold to individuals under any circumstances whatsoever
2014-03-29 13:54 <whitequark> well, not quite. specifically: sulfuric acid >45%, hydrochloric acid >15%, acetic acid >80%
2014-03-29 13:56 <whitequark> also, acetone >60%, toluene >70%, permanganate >40%, nitromethane and nitroethane >40%
2014-03-29 13:56 <whitequark> and a bunch of other things as well
2014-03-29 13:56 <whitequark> no regulation for other mineral acids
2014-03-29 13:57 <whitequark> despite that, there are very very few vendors who send even diluted acids to individuals
2014-03-29 13:57 <wpwrak> so put "whitequart industries" in the first line of the address :)
2014-03-29 13:58 <whitequark> nah, they'll ask you to pay in the appropriate way companies do
2014-03-29 13:58 <DocScrutinizer05> wtf do you dilute acetone and permanganate with?
2014-03-29 13:58 <wpwrak> or find a supplier nearby so that you can visit them with a bottle of vodka. a fair trade: you bring a bottle of vodka, you leave with a bottle of concentrated whatever.
2014-03-29 13:58 <whitequark> DocScrutinizer05: acetone → water, permanganate... I guess water too
2014-03-29 13:59 <DocScrutinizer05> err
2014-03-29 13:59 <wpwrak> DocScrutinizer05: peroxide ? :)
2014-03-29 13:59 <DocScrutinizer05> KMnO4 in water isn't stable
2014-03-29 13:59 <whitequark> DocScrutinizer05: ethanol then?
2014-03-29 13:59 <DocScrutinizer05> and I doubt acetone will mix with water
2014-03-29 14:00 <whitequark> acetone absolutely does, it is quite polar
2014-03-29 14:00 <wpwrak> whatever sludge the ministry of nuclear waste disposal pays you to get rid of for them ?
2014-03-29 14:02 <DocScrutinizer05> so you say you can't get any crystalline KMnO4?
2014-03-29 14:03 <whitequark> I don't think so
2014-03-29 14:03 <DocScrutinizer05> weird
2014-03-29 14:04 <whitequark> used in organic synthesis as oxidizer
2014-03-29 14:04 <DocScrutinizer05> I however wonder what those 40% are meant
2014-03-29 14:04 <whitequark> basically if you want to do any organic synthesis you're fucked, because all common compounds are restricted
2014-03-29 14:04 <whitequark> "can be used to make narcotic drugs", my ass
2014-03-29 14:04 <whitequark> hands and brain also can be used for that, better restrict them too
2014-03-29 14:05 <DocScrutinizer05> KMnO4 is not really soluble in water to amounts of >40% of weight or volume, or mol, I guess
2014-03-29 14:06 <whitequark> I have no clue
2014-03-29 14:09 <DocScrutinizer05> anyway, bluebox alarm, the zombie leaves his cage
2014-03-29 14:09 <DocScrutinizer05> o/
2014-03-29 14:17 <DocScrutinizer05> fun: http://maemo.cloud-7.de/share-service/20140329_001.jpg
2014-03-29 14:18 <whitequark> "Schadenfreudenburg" hahaha
2014-03-29 14:20 <whitequark> look at this pump: http://i.imgur.com/vkEiX8L.jpg
2014-03-29 14:21 <whitequark> seems like they put a rubber ring around the motor and so made it separate the two parts, turbine compartment and motor compartment
2014-03-29 14:21 <whitequark> except outer case has a crack so water gets in the back compartment
2014-03-29 14:21 <whitequark> ugh.
2014-03-29 15:12 <DocScrutinizer51> whitequark: indeed ugh
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2014-03-29 16:12 <wpwrak> time for a reboot ...
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2014-03-29 17:22 <whitequark> DocScrutinizer51: you'll like http://hack-a-day.github.io/arduinoOut/
2014-03-29 17:22 <whitequark> well. seems everyone here would like it :p
2014-03-29 17:23 * wpwrak goes for the booze. hopes not to wake up before the day of engineering shame has ended.
2014-03-29 17:24 <whitequark> giggle
2014-03-29 17:25 <whitequark> wpwrak: my comment (have you read it already?): http://hackaday.com/2014/03/29/arduino-day-is-today/#comment-1312821
2014-03-29 17:26 <larsc> omg1 they keep multiplying
2014-03-29 17:26 <wpwrak> hehe, well put :)
2014-03-29 17:28 <wpwrak> pro tip: catch the skull "sideways". then it'll be caught in the paddle, move left and right but no fly odd (until you move the paddle away)
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2014-03-29 17:34 <DocScrutinizer05> well, lucky enough I had my my last Absolut100 *before* I ran into this
2014-03-29 17:35 <whitequark> you drink vodka?
2014-03-29 17:35 <DocScrutinizer05> sure, nothing else usually
2014-03-29 17:36 <DocScrutinizer05> this "game" is shite though, I keep the arrow keys hammered and nothing moves
2014-03-29 17:36 <DocScrutinizer05> :-(
2014-03-29 17:36 <DocScrutinizer05> while the "ball" bounces out
2014-03-29 17:36 <whitequark> hmmm
2014-03-29 17:36 <whitequark> thats weird
2014-03-29 17:36 <DocScrutinizer05> huuuuge delays
2014-03-29 17:37 <whitequark> do you use IE6 ?
2014-03-29 17:37 <whitequark> oh, delays. so you run latest chrome on pdp-11? :p
2014-03-29 17:37 <DocScrutinizer05> WUT?
2014-03-29 17:37 <whitequark> what I mean is that any recent-ish browser on recent-ish machine shouldn't have any problems *shrug*
2014-03-29 17:38 <whitequark> sadly JS games have thrown us back in performance by factor of somewhere between 100-1000
2014-03-29 17:39 <DocScrutinizer05> jr@saturn:~> time for ((i=0; i<1000000; i++)); do :; done
2014-03-29 17:39 <DocScrutinizer05> real    0m3.826s
2014-03-29 17:39 <DocScrutinizer05> user    0m3.761s
2014-03-29 17:39 <DocScrutinizer05> sys     0m0.060s
2014-03-29 17:39 <whitequark> will be a while before moore's law catches on. or maybe we'll never regain it, seeing as JS is strictly single core and moore's law works on multicore for several years
2014-03-29 17:39 <whitequark> 4.8s on my machine
2014-03-29 17:40 <dos1> 4.8s and game works nice on Konqueror
2014-03-29 17:40 <whitequark> I'm impressed, what is this beast you run that a ivy bridge i7 with 12G of RAM and an SSD can't beat?
2014-03-29 17:40 <DocScrutinizer05> i5
2014-03-29 17:40 <DocScrutinizer05> 8G, SSD
2014-03-29 17:41 <dos1> but I think it's using onkeypress instead of onkeydown/up, so the "delay" may depend on the key repeat delay
2014-03-29 17:41 <whitequark> though, I wonder what is the bottleneck in this test
2014-03-29 17:41 <dos1> laptop, i5, 8G and SSD here ;)
2014-03-29 17:41 <whitequark> DocScrutinizer05: cat /proc/cpuinfo | head -n 30|grep 'cache size'
2014-03-29 17:42 <DocScrutinizer05> cache size      : 6144 KB
2014-03-29 17:42 <whitequark> mine is 4096 KB, so my guess is likely right
2014-03-29 17:42 <dos1> 3072 KB
2014-03-29 17:42 <whitequark> it's cache-bound
2014-03-29 17:43 <whitequark> that's basically a fork() benchmark
2014-03-29 17:43 <DocScrutinizer05> booze down to zilch, gotta leave to get more
2014-03-29 17:43 <whitequark> so you're just sitting there alone drinking vodka?
2014-03-29 17:44 <whitequark> are you sure you aren't russian and/or alcoholic? :p
2014-03-29 17:44 <DocScrutinizer05> I did, now it's over
2014-03-29 17:44 <DocScrutinizer05> no, I drank vodka and am still listening to B52s
2014-03-29 17:45 <DocScrutinizer05> and that's actually something I missed a lot, just sitting there and listening music with a glass of vodka
2014-03-29 17:45 <DocScrutinizer05> and now I'm again in fron of this brainkiller
2014-03-29 17:45 <DocScrutinizer05> o/
2014-03-29 17:46 <whitequark> okay...
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2014-03-29 18:15 <wpwrak> real    0m7.663s, sigh
2014-03-29 18:16 <wpwrak> still not too bad for an old Q6600
2014-03-29 18:16 <wpwrak> shows that things haven't improved much in the last demi-decade
2014-03-29 18:18 <whitequark> wpwrak: well, if fork performance is the only critical thing to you... ;)
2014-03-29 18:18 <wpwrak> (brainkiller) that would be bild.de then, i guess :)
2014-03-29 18:18 <larsc> I though he meant the vodka
2014-03-29 18:19 <wpwrak> (cpu performance) i suppose it's not all that different in may other aspects
2014-03-29 18:19 <wpwrak> larsc: hehe ;-) indeed, let's celebrate the traditional values ! :) nastrovje !
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2014-03-29 18:22 <larsc> could also be some kind of medication though. "I'm on prescribed brainkillers, the extra strong ones"
2014-03-29 18:26 <wpwrak> ah, that's the new anti-zombie vaccination, isn't it ?
2014-03-29 18:35 <whitequark> let the holy war commence. http://hackaday.com/2014/03/29/arduino-day-is-today/#comment-1312974
2014-03-29 18:36 <larsc> already deleted
2014-03-29 18:36 <larsc> at least that comment does not seem to be visible
2014-03-29 18:38 <whitequark> visible for me
2014-03-29 18:38 <whitequark> weird
2014-03-29 18:38 <whitequark> visible for me even in incognito mode...
2014-03-29 18:39 <larsc> ah, now it is
2014-03-29 18:41 <whitequark> er, posted it as a reply to the wrong person :/
2014-03-29 18:41 <whitequark> crappy interface
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2014-03-29 19:13 <larsc> well better late then never "[PATCH v2] fs: FAT: Add support for DOS 1.x formatted volumes"
2014-03-29 19:25 <whitequark> lol
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2014-03-29 20:11 <whitequark> a guy using arduino in production, not understanding how power management works
2014-03-29 20:11 <whitequark> why am I not surprised...
2014-03-29 20:22 <larsc> well, does he have to?
2014-03-29 20:31 <wpwrak> larsc: (dos 1.x) so we're seeing the first fallout from the source code release :)
2014-03-29 20:31 <whitequark> larsc: he claims to be a professional embedded developer
2014-03-29 20:32 <whitequark> and says that EE community is close-minded for not appraising his work
2014-03-29 20:32 * whitequark shrugs
2014-03-29 20:40 <wpwrak> "RMs are not necessarily cheaper than AVRs, " huh ?
2014-03-29 20:42 <whitequark> hm?
2014-03-29 20:42 <wpwrak> didn't you mean the opposite ?
2014-03-29 20:42 <whitequark> whoops
2014-03-29 20:43 <whitequark> well, I corrected myself in some next message anyway
2014-03-29 20:44 <whitequark> I made parametric gcode for milling a container out of acrylic: https://gist.github.com/whitequark/9862605
2014-03-29 20:46 <wpwrak> let's see how long until you snap out of this "g-code as source" mindset :)
2014-03-29 20:46 <whitequark> so far I haven't found a CAM which works for me
2014-03-29 20:47 <whitequark> well, there's pcb-gcode which mostly works (but is for other things), and inkscape gcode plugin (which is also for other things and really only good for generating sequences of points
2014-03-29 20:48 <wpwrak> by the time you get to 3D, you'll have to, in one way or another
2014-03-29 20:48 <whitequark> wpwrak: what do you use?
2014-03-29 20:48 <whitequark> 3D... well, if I need an arbitrary mesh, then sure, need some kind of CAM
2014-03-29 20:48 <wpwrak> for 3D ? fped :)
2014-03-29 20:48 <wpwrak> for 2D, fped (and happy with it) or kicad, depending on what it is i'm doing
2014-03-29 20:48 <whitequark> but mostly I don't want or need arbitrary mesh. I need a pocket here, a profile there.. which can be perfectly done with some handy gcode routines
2014-03-29 20:49 <whitequark> and when gcode will get a little unwieldy, I have plans for my own CAM :p
2014-03-29 20:49 <wpwrak> ;-)
2014-03-29 20:49 <whitequark> based on a pure functional DSL, manipulating contours (and sometimes meshes), then spitting out them as gcode
2014-03-29 20:50 <whitequark> operations such as: make a contour for a primitive or a set of points; apply affine transform; intersect/union/subtract contours; pocket/profile by contour (with const TEA of course)
2014-03-29 20:51 <whitequark> I just need to bind to / port libarea/libkbool, and its insides gross me out *really badly*
2014-03-29 20:51 <whitequark> who the fuck even writes like that
2014-03-29 20:51 <whitequark> (╯°□°）╯︵ ┻━┻
2014-03-29 20:52 <whitequark> wpwrak: maybe that CAM will once be able to eat contours from FreeCAD, like heekscnc is supposed to (but the published version doesn't actually work)
2014-03-29 20:52 <whitequark> (and heekscnc is so horrible to use anyway, it's even much worse than freecad)
2014-03-29 20:52 <whitequark> *heekscad
2014-03-29 20:53 <whitequark> wpwrak: I do agree this approach is too repetitive though, e.g. manually writing out four egdes is not fun at all
2014-03-29 20:53 <whitequark> and that doesn't decompose into gcode subroutines cleanly
2014-03-29 20:53 <whitequark> hence, my own CAM
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2014-03-29 23:27 <Guest54638> do you have noise from you NN spk or headphones?
2014-03-29 23:28 <Guest54638> background noise, hiss,fissile that's noticeable when listening to music?
2014-03-29 23:29 <Guest54638> I find it more noticeable when using ear pieces than big headphones