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2016-05-06 00:52 <wpwrak> limpkin: yes, i'm here :)
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2016-05-06 04:50 <limpkin> Seems we're not in the same time zone then aha :)
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2016-05-06 05:06 <DocScrutinizer05> [2016-05-06 Fri 02:55:13] <tmyklebu_> google chrome *actually is* malware.  flash is just shitty.
2016-05-06 05:06 <DocScrutinizer05> [2016-05-06 Fri 02:55:50] <tmyklebu_> they advertise that it sends your keystrokes to the mothership and all.
2016-05-06 05:09 <DocScrutinizer05> [2016-05-06 Fri 03:00:11] <gci_admin> There is also Vivaldi browser, based on Chromium but without the spying. Or so I have heard.
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2016-05-06 07:44 <arossdotme> hmm yea the sure mono 300w amp board is odd that they say its 300w into 2ohm when the amp sound be able to do mono 300w 4ohm.... hmm
2016-05-06 07:44 <arossdotme> sound=should
2016-05-06 08:09 <arossdotme> looking at the datasheet again it seams the TI IC in the sure 300w board can only do 130w 1%THD into 4ohm in PBLT setup. so i guess its not as capable as i thought it was but the IC’s bigger brother is :D tas5630
2016-05-06 08:09 <arossdotme> so ill get the yj tas5630 board unless i get the IRS one... :/
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2016-05-06 16:44 <DocScrutinizer05> sorry for OT: 	10.40.66.150   what an IP is this?
2016-05-06 16:44 <DocScrutinizer05> it's showing up in my 192.168.4.1/24 network
2016-05-06 16:45 <DocScrutinizer05> NFC how it made it there
2016-05-06 16:46 <DocScrutinizer05> http://wstaw.org/m/2016/05/06/plasma-desktopHB2219.png
2016-05-06 16:47 <DocScrutinizer05> could this be a damn brainfscked windows7 PC that has a *hostname* like that?
2016-05-06 16:49 <DocScrutinizer05> MEH!!!  10.0.0.0 10.255.255.255 Class A network 10.x.x.x 10/8 Class A private address block.
2016-05-06 16:51 <DocScrutinizer05> now I wish I had a log of my DHCP leases... Well I have but that definitely wasn't a lease
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2016-05-06 18:08 <DocScrutinizer05> could somebody please lock up in same room Putin and Erdogan plus 3 similar bigmouthed fools to help him against Putin, and only let out one party after the other deceased?
2016-05-06 18:09 <DocScrutinizer05> or lose the key and forget about it
2016-05-06 18:10 <DocScrutinizer05> ooh and before I forget: Turkey out of NATO, *subito*
2016-05-06 18:10 <DocScrutinizer05> maybe take Hungary with you
2016-05-06 18:13 <whitequark> DocScrutinizer05: what if they unite
2016-05-06 18:14 <whitequark> i won't take the chance
2016-05-06 18:14 <DocScrutinizer05> ((lock up in same room)) preferably at some unknown random location in Syria
2016-05-06 18:15 <DocScrutinizer05> somewhere in the territories that are not controlled by gvmt troops
2016-05-06 18:15 <DocScrutinizer05> and thus prone to random bombing
2016-05-06 18:19 <wpwrak> limpkin: best to just say what you have to say, then pick up the response the next time you're around. and eventually, convergence may occur :)
2016-05-06 18:20 <limpkin> Aha :)
2016-05-06 18:20 <DocScrutinizer05> you seen this? (well that's what German TV news report, so take with a grain of salt) Turkish police stops a truck convoy to Syria or similar. Erdogan declared this is humanitarian help. Reproters publsih internal documents that say opposite, and show photos of cargo of grenades in that convoy. Reporters get sentenced 5 years for treason
2016-05-06 18:20 <limpkin> Recently discovered your offline password keeper project, looked quite neat
2016-05-06 18:21 <limpkin> What's the current status?
2016-05-06 18:22 <DocScrutinizer05> in front of court some random asshole shoots at the reporter
2016-05-06 18:23 <DocScrutinizer05> limpkin: anelok is the name
2016-05-06 18:23 <limpkin> Thanks, I had forgotten
2016-05-06 18:23 <DocScrutinizer05> np :-)
2016-05-06 18:27 <DocScrutinizer05> (Turkey) and that same Erdogan think he can extort EU to cancel visa requirements for turkish
2016-05-06 18:28 <DocScrutinizer05> this idiot hasn't understood yet that he couldn't do us a greater favor than overbidding his hand
2016-05-06 18:31 <DocScrutinizer05> merkel gone, Turkey refugee treaty void, EU forced to find some *decent* honest solution for the whole mess, Turkey never member of EU and no visa-free immigration either
2016-05-06 18:31 <DocScrutinizer05> ohwell you may dream, no?
2016-05-06 18:32 <whitequark> how do you select fuses?
2016-05-06 18:33 <whitequark> i have a slow-blow fuse guarding a compressor that normally draws 4A
2016-05-06 18:33 <DocScrutinizer05> by smell? ;-D
2016-05-06 18:33 <whitequark> T type 5A
2016-05-06 18:33 <whitequark> it blows after a few dozen cycles, hot to touch
2016-05-06 18:33 <whitequark> for this compressor http://www.refair.fi/images/technical/Cubigel/GP12TG.pdf
2016-05-06 18:33 <DocScrutinizer05> hmm, you prolly should use a 10A
2016-05-06 18:34 <DocScrutinizer05> industrial-T
2016-05-06 18:34 <whitequark> how fast are F and T?
2016-05-06 18:34 <whitequark> wait
2016-05-06 18:34 <whitequark> waaaait
2016-05-06 18:35 <DocScrutinizer05> Locked rotor current (A)  16.0
2016-05-06 18:35 <DocScrutinizer05> T is a very fuzzy spec
2016-05-06 18:35 <DocScrutinizer05> also I see "200V"
2016-05-06 18:36 <whitequark> hm
2016-05-06 18:36 <whitequark> 220V actually
2016-05-06 18:36 <whitequark> just designed for shitty rural conditions i guess?
2016-05-06 18:36 <DocScrutinizer05> WTF is >> Approximate Power (CV)  3/8 <<  CheVaux?
2016-05-06 18:37 <whitequark> horsepower
2016-05-06 18:37 <DocScrutinizer05> >> Voltage/Frequency (V/Hz)  200V 50Hz<<
2016-05-06 18:38 <DocScrutinizer05> so three eight-ths--thts of a one horsepower?
2016-05-06 18:38 <DocScrutinizer05> this datashit is terrible
2016-05-06 18:39 <DocScrutinizer05> though >> Voltage range (V)  170-242<<
2016-05-06 18:39 <whitequark> yes
2016-05-06 18:41 <DocScrutinizer05> ~242/170
2016-05-06 18:41 <DocScrutinizer05>  /msg apt die
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2016-05-06 18:44 <DocScrutinizer05> ~(242/170)**2
2016-05-06 18:44 <infobot> 2.026435986159
2016-05-06 18:45 <DocScrutinizer05> ~4*(240/200)
2016-05-06 18:45 <infobot> 4.8
2016-05-06 18:46 <DocScrutinizer05> here you are with your 5A fuse ;-)
2016-05-06 18:46 <DocScrutinizer05> add the 16A startup burst to this, N times, and the fuse is gone
2016-05-06 18:48 <DocScrutinizer05> also see >>ELECTRICAL COMPONENTS<<
2016-05-06 18:50 <DocScrutinizer05> plus you don't even know what's the real VA during startup incl start capacitor
2016-05-06 18:51 <whitequark> yes that's why i took a slow blow fuse
2016-05-06 18:51 <DocScrutinizer05> generally I'd use a 10A T for compressors any time
2016-05-06 18:51 <whitequark> ceramic or glass?
2016-05-06 18:51 <whitequark> more generally, not just for this case
2016-05-06 18:52 <DocScrutinizer05> err which type of fuse?
2016-05-06 18:52 <whitequark> yeah
2016-05-06 18:52 <DocScrutinizer05> not yeah, which type?
2016-05-06 18:52 <DocScrutinizer05> a 5*20mm?
2016-05-06 18:52 <whitequark> yes
2016-05-06 18:52 <DocScrutinizer05> ohmy
2016-05-06 18:53 <whitequark> ceramic is cheaper and has higher breaking capacity
2016-05-06 18:53 <whitequark> but I guess can't be viewed?
2016-05-06 18:53 <whitequark> observed
2016-05-06 18:53 <DocScrutinizer05> prolly hard to find a 5*20 for this usecase
2016-05-06 18:53 <whitequark> huh? plenty of them
2016-05-06 18:53 <whitequark> http://hken.rs-online.com/web/p/cartridge-fuses/5371004/ http://hken.rs-online.com/web/p/cartridge-fuses/0563592/
2016-05-06 18:54 <DocScrutinizer05> my completely uneducated notiuon is: those fuses are not made to withstand this sort of load
2016-05-06 18:54 <whitequark> how so?
2016-05-06 18:54 <DocScrutinizer05> too small, will get terribly hot
2016-05-06 18:55 <DocScrutinizer05> and particularly too fast
2016-05-06 18:56 <DocScrutinizer05> because of lack of thermal capacity
2016-05-06 18:57 <whitequark> the power entry module I use is rated at 10A as well... 
2016-05-06 18:57 <whitequark> http://www.mouser.hk/ProductDetail/Bulgin/BZH01-Z0000-02/?qs=TobE%2fWCMdlw%252bQ2v7k%2fNv5w%3d%3d
2016-05-06 18:57 <DocScrutinizer05> T here means maybe a few 100ms
2016-05-06 18:57 <whitequark> that should be adequate for motor startup
2016-05-06 18:57 <DocScrutinizer05> no, isn't
2016-05-06 18:57 <DocScrutinizer05> not really
2016-05-06 18:57 <DocScrutinizer05> might be >1s
2016-05-06 18:59 <DocScrutinizer05> anyway the startup bursts are >10A most probably and thus age the fuse
2016-05-06 18:59 <DocScrutinizer05> eventually it will just give up
2016-05-06 19:00 <DocScrutinizer05> use a 16A if you can get. The device is supposed to have a built in protector circuit anyway
2016-05-06 19:00 <DocScrutinizer05> see !OVERLOAD"
2016-05-06 19:00 <DocScrutinizer05> s/!/"/
2016-05-06 19:00 <qi-bot> DocScrutinizer05 meant: "see "OVERLOAD""
2016-05-06 19:00 <whitequark> yes, it does
2016-05-06 19:01 <whitequark> the fuse is to catch failures elsehwere
2016-05-06 19:01 <whitequark> it also has a pump, a fan, a control box...
2016-05-06 19:01 <DocScrutinizer05> Protector  MRT20APK         Current (A)  13.2
2016-05-06 19:01 <whitequark> also I would rather catch a failure early than wait 5+ minutes until the protector trips
2016-05-06 19:02 <DocScrutinizer05> your fuse is supposed to not blow before the protector engages
2016-05-06 19:02 <whitequark> why?
2016-05-06 19:02 <whitequark> also, hm
2016-05-06 19:02 <DocScrutinizer05> because you don't want to change it every other day?
2016-05-06 19:02 <whitequark> that section is rather confusing
2016-05-06 19:03 <whitequark> the "protector" is a bimetallic plate that measures the temperature of the compressor casing
2016-05-06 19:03 <DocScrutinizer05> it also is a heater in itself
2016-05-06 19:03 <whitequark> oh right
2016-05-06 19:03 <DocScrutinizer05> see the resistor in the circuit diagram symbol
2016-05-06 19:04 <DocScrutinizer05> so it's basically a fuse
2016-05-06 19:05 <DocScrutinizer05> and it's set up in a way so it only triggers when the compressor suffers overload for whatever reasons. AIUI it does so at nominally 13.2A
2016-05-06 19:05 <whitequark> well, there are two actions
2016-05-06 19:05 <whitequark> it also watches for overheat of compressor without overcurrent
2016-05-06 19:05 <whitequark> if there is no cooling of freon then the compressor can pump but get hotter and hotter
2016-05-06 19:05 <whitequark> e.g. if the fan died
2016-05-06 19:05 <DocScrutinizer05> yes, Iknow those fridge compressor circuits
2016-05-06 19:06 <DocScrutinizer05> most usual overheating reason is repeated starts
2016-05-06 19:07 <whitequark> hmmm
2016-05-06 19:07 <DocScrutinizer05> those compressors are not made to get started more than once every 5 minutes
2016-05-06 19:07 <whitequark> this chiller i designed doesn't appear to suffer much from repeated starts, i tried running it with hysteresis of 1°C
2016-05-06 19:08 <whitequark> and it doesn't even get hot if the duty cycle is not high
2016-05-06 19:08 <DocScrutinizer05> I just can report what I've seen in hundreds of fridges
2016-05-06 19:08 <whitequark> yeah, I believe you about fridges, I've read that too
2016-05-06 19:08 <whitequark> I am wondering what is the exact difference
2016-05-06 19:08 <DocScrutinizer05> I've seen it
2016-05-06 19:09 <whitequark> it's not the compressor itself but rather something else about the freon circuit, I think
2016-05-06 19:09 <whitequark> hang on
2016-05-06 19:09 <whitequark> I remember now what I read about repeated starts, the core of the issue was not repeated start itself, rather repeated start was a symptom
2016-05-06 19:09 <DocScrutinizer05> try to start your fridge 4 times in one minute, it will go into chillout mode
2016-05-06 19:10 <whitequark> overheat, protector trips, cools down, turns on, overheat...
2016-05-06 19:10 <whitequark> then at some point it fails because it's not made to be that hot that long
2016-05-06 19:10 <whitequark> re chillout mode: isn't that just the PTC starter?
2016-05-06 19:11 <DocScrutinizer05> seen the effect I mentioned, a several dozen times
2016-05-06 19:11 <DocScrutinizer05> no, that's the overload protection afaik
2016-05-06 19:11 <whitequark> so let's try this, i'll start this thing 20 times in 1.5 minutes
2016-05-06 19:11 <whitequark> is that enough?
2016-05-06 19:12 <whitequark> i'm certain enough that repeated starts themselves aren't the issue that i don't worry about this killing my chiller
2016-05-06 19:12 <DocScrutinizer05> enough for your 5A fuse? ;-) for sure
2016-05-06 19:12 <whitequark> yeah, with some higher rated fuse.
2016-05-06 19:14 <DocScrutinizer05> look, a fuse with 10A is sort of warranted to stay intact with 10A, but the other characteristics vary massively with type of fuse. A simple household fuse 10A T may survive 20A for a 15 minutes
2016-05-06 19:14 <DocScrutinizer05> a 20*5mm will not survive for one minute
2016-05-06 19:16 <DocScrutinizer05> prolly not for 10s
2016-05-06 19:16 <whitequark> ok so I started it about 50 times as fast as it would run, running it less than for 1s every time
2016-05-06 19:16 <whitequark> actually the 5A fuse survived it all
2016-05-06 19:16 <whitequark> this is sand-filled ceramic so I think it has a higher effective capacity because of all the sand dissipating the heat
2016-05-06 19:17 <DocScrutinizer05> get datasheets if you want to know for sure
2016-05-06 19:17 <whitequark> and no the compressor is barely warm
2016-05-06 19:18 <DocScrutinizer05> *shrug*
2016-05-06 19:18 <DocScrutinizer05> I got no more experienced anecdotes to contribute
2016-05-06 19:19 <whitequark> ohhhh http://docs-asia.electrocomponents.com/webdocs/135f/0900766b8135f371.pdf
2016-05-06 19:19 <whitequark> opening time 60 Minutes minimum
2016-05-06 19:19 <whitequark> for 150%
2016-05-06 19:20 <whitequark> yea looks like these ceramic cartridge fuses can withstand a lot of abuse before they blow
2016-05-06 19:20 <whitequark> i'll go with 10A T
2016-05-06 19:20 <DocScrutinizer05> hmm?
2016-05-06 19:21 <DocScrutinizer05> seems like the 1AT blows in 0.3s with 3A
2016-05-06 19:23 <whitequark> ywah
2016-05-06 19:23 <DocScrutinizer05> now take your compressor that's possibly drawing 16A during startup, and a 5AT fuse
2016-05-06 19:23 <DocScrutinizer05> that's exactly what I meant
2016-05-06 19:23 <whitequark> .75s min 80s max
2016-05-06 19:23 <DocScrutinizer05> T is not always like T
2016-05-06 19:23 <whitequark> but that's for continuous 10A
2016-05-06 19:23 <whitequark> er 5A
2016-05-06 19:23 <whitequark> er 16A over 5A fuse
2016-05-06 19:27 <DocScrutinizer05> I looked at the diagram
2016-05-06 19:27 <DocScrutinizer05> you should go for a 15AT
2016-05-06 19:28 <DocScrutinizer05> good for short protection, leave the rest to the OVERLOAD protector component
2016-05-06 19:29 <DocScrutinizer05> when you have other stuff as well which you want to protect, you rather should use a dedicated fuse for that other stuff
2016-05-06 19:31 <DocScrutinizer05> your 50 starts test is maybe not very relevant since the fuse didn't even heat up from nominal current
2016-05-06 19:32 <DocScrutinizer05> wpwrak: a user asked about anelok
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2016-05-06 19:41 <DocScrutinizer05> whitequark: >>.75s min 80s max 16A over 5A fuse<< yep, maybe, but not repeatedly, this is strictly oneshot
2016-05-06 19:41 <DocScrutinizer05> fuse will age and wear out
2016-05-06 19:41 <DocScrutinizer05> it stores up each overcurrent
2016-05-06 19:41 <DocScrutinizer05> eventually it breaks
2016-05-06 19:42 <DocScrutinizer05> particularly those flimsy 20*5 ones
2016-05-06 19:48 <whitequark> DocScrutinizer05: yes hence i go for 10AT
2016-05-06 19:49 <DocScrutinizer05> might work, buit why not go for 16A ?
2016-05-06 19:49 <whitequark> where it's *supposed* to withstand that 16A overshoot
2016-05-06 19:49 <whitequark> because the power entry module is rated for 10A max
2016-05-06 19:49 <whitequark> I don't like the idea of using a 16AT fuse in something rated for 10A
2016-05-06 19:49 <DocScrutinizer05> what is this power entry module?
2016-05-06 19:50 <whitequark> http://www.mouser.hk/ProductDetail/Bulgin/BZH01-Z0000-02/?qs=TobE%2fWCMdlw%252bQ2v7k%2fNv5w%3d%3d
2016-05-06 19:50 <whitequark> http://www.mouser.com/ds/2/57/Polysnap-2010-4034.pdf
2016-05-06 19:51 <DocScrutinizer05> hmm ok, makes sense
2016-05-06 19:53 <DocScrutinizer05> whether it makes sense to use a 10A rated power module for a compressor rated 13.2A overcurrent protection, is another question
2016-05-06 19:54 <DocScrutinizer05> can't you use a larger fuse, like 10*30mm or whatever?
2016-05-06 19:54 <DocScrutinizer05> prolly integrated into the power module, eh?
2016-05-06 19:54 <whitequark> yep
2016-05-06 19:54 <whitequark> that was like half the point
2016-05-06 19:54 <DocScrutinizer05> ideally use a softstart circuit
2016-05-06 19:57 <DocScrutinizer05> I designed a really oldschool "russian design" softstart for a cinema projector 1600W Xenon transformer/rectifier: relay coil in parallel to the consumer (transformer), a 20 Ohm series resistor that gets shorted by the relay contact
2016-05-06 19:57 <DocScrutinizer05> the friggin transforme was a quarter ton
2016-05-06 19:58 <DocScrutinizer05> literally
2016-05-06 19:58 <whitequark> 250kg for 1600W?
2016-05-06 19:58 <whitequark> that seems super inefficient
2016-05-06 19:58 <DocScrutinizer05> yep
2016-05-06 19:58 <DocScrutinizer05> it had a monster DC choke for smoothing the current
2016-05-06 19:59 <DocScrutinizer05> no significan capacitors
2016-05-06 19:59 <whitequark> seems like stupid wasteful design
2016-05-06 19:59 <DocScrutinizer05> plus the whole thing was adjustable
2016-05-06 19:59 <whitequark> oh like a variac?
2016-05-06 19:59 <DocScrutinizer05> Selen rectifiers
2016-05-06 20:00 <DocScrutinizer05> made in the 1930s
2016-05-06 20:00 <DocScrutinizer05> yes
2016-05-06 20:00 <whitequark> oh 1930s that explains it
2016-05-06 20:00 <DocScrutinizer05> nah, nowadays that's a 5kg SPSU
2016-05-06 20:01 <DocScrutinizer05> that thing was a tank
2016-05-06 20:01 <DocScrutinizer05> 300kg
2016-05-06 20:02 <DocScrutinizer05> 90*60*50cm
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2016-05-06 20:04 <DocScrutinizer05> this sort of technical level: http://www.fernsehmuseum.info/index.php?eID=tx_cms_showpic&file=uploads%2Fpics%2FVorfuehrraum-ErnemannX-werkfoto.jpg&width=1280m&height=1024m&bodyTag=%3Cbody%20style%3D%22margin%3A0%3B%20background%3A%23fff%3B%22%3E&wrap=%3Ca%20href%3D%22javascript%3Aclose%28%29%3B%22%3E%20%7C%20%3C%2Fa%3E&md5=0bed2a1c6083e190964f0523255f09bf
2016-05-06 20:04 <eintopf> hi
2016-05-06 20:07 <DocScrutinizer05> http://www.fernsehmuseum.info/index.php?eID=tx_cms_showpic&file=uploads%2Fpics%2FVorfuehrraum-ErnemannX-4kanal-uniphon-verstarker.jpg&width=1280m&height=1024m&bodyTag=%3Cbody%20style%3D%22margin%3A0%3B%20background%3A%23fff%3B%22%3E&wrap=%3Ca%20href%3D%22javascript%3Aclose%28%29%3B%22%3E%20%7C%20%3C%2Fa%3E&md5=51ebfe827bcfdb142580e869fcd8db9c  you see the black lamp current adjustment knobleft side at bottom end of the projector, it
2016-05-06 20:07 <DocScrutinizer05> adjusted the DC current that controlled the https://en.wikipedia.org/wiki/Transductor
2016-05-06 20:08 <whitequark> even without switchng you don't need that much
2016-05-06 20:08 <DocScrutinizer05> hi eintopf
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2016-05-06 20:09 <whitequark> hah, a magnetic amplifier
2016-05-06 20:09 <whitequark> that's truly ancient tech
2016-05-06 20:15 <DocScrutinizer05> this was the lamp: http://www.kinobauer.de/anleitungen/BL9X_manual.pdf  I doubt I could find docs for the transformer/rectifier/regulator
2016-05-06 20:16 <DocScrutinizer05> I guess the xenon was even just 800W, no 1600
2016-05-06 20:18 <DocScrutinizer05> 40..70A * ~25V
2016-05-06 20:19 <wpwrak> limpkin: it's very slowly crawling forward. i now have the next hw design mostly finished (still needs a bit more work on CAD, and then the layout)
2016-05-06 20:20 <limpkin> great! last time i tried to access the website it was offline or had some problems though
2016-05-06 20:21 <limpkin> are you alone working on it?
2016-05-06 20:21 <wpwrak> limpkin: with all that, i think it's time to try to a crowdfunding campaign. that projects needs proper funding to be able to speed up, so that'll be critical.
2016-05-06 20:21 <wpwrak> oh, right ... lemme put it back into service ... it'll spit out a complaint about hte certificate but it'll work
2016-05-06 20:21 <limpkin> sending you a pm
2016-05-06 20:24 <wpwrak> so far i do most of the work, yes. some biz side discussions with dave ball (but we haven't created a company just yet), discussions on the qi-hw list with various members, and a few people have contributed a bit of code, but i'd say it's something like 98% me so far. that will have to change, too :)
2016-05-06 20:25 <limpkin> congrats
2016-05-06 20:26 <DocScrutinizer05> krhrhr, good luck with changing that
2016-05-06 20:26 <DocScrutinizer05> whitequark: http://www.osram.com/appsinfo/pdc/pdf.do?cid=GPS01_1028548&mpid=ZMP_1200637&vid=PP_EUROPE_Europe_eCat&lid=EN
2016-05-06 20:27 <whitequark> huh still mfgd?
2016-05-06 20:28 <DocScrutinizer05> yep
2016-05-06 20:29 <DocScrutinizer05> I guess for several 100 bucks per lamp they will continue to do so until some regulations about radioactive materials forbid
2016-05-06 20:29 <DocScrutinizer05> (the wolfram electrodes are doted with some radioactive stuff to facilitate igniting the arc)
2016-05-06 20:30 <whitequark> thoriated?
2016-05-06 20:30 <whitequark> thorium is an alpha emitter so that's actually ok
2016-05-06 20:31 <whitequark> welding electrodes made from thoriated tungsten are not just still sold, in HK I couldn'd find any other ones (eg lanthaated)
2016-05-06 20:31 <whitequark> and that's ok as long as you don't make them into fine dust
2016-05-06 20:31 <whitequark> the problem with welding electrodes is that before welding, you are supposed to grind them, and wel...
2016-05-06 20:32 <whitequark> and that's pretty stupid too because all modern TIG comes with HF starter, don't need no radioactivity for that
2016-05-06 20:32 <whitequark> I think thorium in these welding electrodes was more for its refractory properties than arc starting as well
2016-05-06 20:33 <DocScrutinizer05> dunno
2016-05-06 20:35 <DocScrutinizer05> it was quite impressive which protective wear you needed to handle those lamps. changing them you looked like a bomb technician
2016-05-06 20:35 <DocScrutinizer05> because of the gas pressure
2016-05-06 20:36 <DocScrutinizer05> whe a lamp went *boom* when hot, it regularly killed the reflector made of 1cm thick glas which was like 20cm away from the lamp
2016-05-06 20:38 <whitequark> well it pretty much is a bomb
2016-05-06 20:38 <DocScrutinizer05> damn, ding doesn't know "Quarzglass"
2016-05-06 20:39 <DocScrutinizer05> yeah, even when cold it seems that fused quartz under 3 atmospheres pressure is not exactly healthy
2016-05-06 20:39 <whitequark> fused quartz is a pretty good material to work with. very low coeff of expansion, and rather resistant overall
2016-05-06 20:39 <whitequark> but as any other glass it'll fragment
2016-05-06 20:40 <DocScrutinizer05> yeah, but when it breaks...
2016-05-06 20:40 <DocScrutinizer05> exactly
2016-05-06 20:40 <whitequark> i had an idea for a fused quartz dinner set
2016-05-06 20:40 <DocScrutinizer05> and when hot those lamps have iir 20 or 30 Atm pressure
2016-05-06 20:41 <whitequark> instead of dishwashing run it through an oxypropane flame
2016-05-06 20:41 <DocScrutinizer05> hehe
2016-05-06 20:41 <DocScrutinizer05> nice idea
2016-05-06 20:41 <whitequark> have you *seen* how much off the shelf fused quartz costs?
2016-05-06 20:41 <whitequark> and custom is going to run a small fortune
2016-05-06 20:42 <DocScrutinizer05> sure
2016-05-06 20:42 <whitequark> i actually bought a teacup (actually crucible used as a teacup) from fused quartz
2016-05-06 20:42 <whitequark> 100ml $60 I think
2016-05-06 20:42 <DocScrutinizer05> :nod:
2016-05-06 20:42 <DocScrutinizer05> sounds about right
2016-05-06 20:42 <whitequark> might still consider doing it if i find a vendor, hehe
2016-05-06 20:42 <whitequark> but that sounds like custom mold... $$$ even in china
2016-05-06 20:42 <DocScrutinizer05> the problem will be: it's too fragile
2016-05-06 20:43 <whitequark> it's not very fragile
2016-05-06 20:43 <whitequark> I dropped it a bunch of times and I'm 80% sure regular glass would break before that
2016-05-06 20:43 <DocScrutinizer05> let it drop and then tell me again ;-)
2016-05-06 20:43 <DocScrutinizer05> ooh?
2016-05-06 20:43 <whitequark> like I dropped it from ~50cm into the metal sink and it actually *bounced*
2016-05-06 20:43 <DocScrutinizer05> wow
2016-05-06 20:45 <whitequark> would've defnitely shattered if the sink was ceramic
2016-05-06 20:45 <whitequark> stone even?
2016-05-06 20:45 <DocScrutinizer05> yeah, I think it's quite strong but zilch elastic
2016-05-06 20:46 <whitequark> idea: mill a dinner set from a silicon monocrystal
2016-05-06 20:46 <DocScrutinizer05> uiuiuiiiuiiiiuiiii
2016-05-06 20:47 <whitequark> same problem really, extremely strong but cannot absorb impact energy
2016-05-06 20:47 <DocScrutinizer05> I had the useless endpieces of a silicon monocrystal
2016-05-06 20:47 <whitequark> and it has to go somewhere
2016-05-06 20:47 <whitequark> oooh
2016-05-06 20:48 <whitequark> I actually hope to have a czochralski setup in maybe a year
2016-05-06 20:48 <DocScrutinizer05> maybe 3cm diameter on the cut side
2016-05-06 20:48 <whitequark> it *could* be used to grow Si although thats not what i need it for
2016-05-06 20:48 <DocScrutinizer05> wtf wrong with apt?
2016-05-06 20:48 <DocScrutinizer05> ~die
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2016-05-06 20:48 <whitequark> but only up to 3-5cm in total dia, which means I'm not getting that dinner set :D
2016-05-06 20:49 <DocScrutinizer05> :-)
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2016-05-06 20:50 <whitequark> it's actually surprisingly simple to make
2016-05-06 20:50 <whitequark> and not even that expensive, just 3-4k for the diameter above
2016-05-06 20:50 <whitequark> .... if you know the right shop in russia, of course
2016-05-06 20:52 <DocScrutinizer05> hmm, looks like it's not *that* trivial to build
2016-05-06 20:53 <whitequark> it's not trivial or even very simple at all, it's just surprisingly simple compared to *expectations*
2016-05-06 20:53 <whitequark> that is i have not really considered it manageable for 1 person with a modest salary but it is
2016-05-06 20:55 <DocScrutinizer05> hmm, silicon melting point 1400°C, OK
2016-05-06 20:56 <DocScrutinizer05> not as bad as I thought
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2016-05-06 20:56 <whitequark> apart from that I'm getting a furnace capable of 1800°C. I want to play with brazing in inert atmosphere, custom ceramics, stuff like that
2016-05-06 20:56 <DocScrutinizer05> whatever that means: http://scidre.de/index.php?id=81
2016-05-06 20:56 <whitequark> and I need it anyway to prepare the slug
2016-05-06 20:57 <whitequark> the batch?
2016-05-06 20:57 <whitequark> yeah
2016-05-06 20:58 <whitequark> wow, that one is seriously impressive
2016-05-06 20:58 <whitequark> I don't want to know how much it costs
2016-05-06 20:58 <whitequark> nevermind that it doesn't really exist...
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