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2014-08-08 13:16 <whitequark> wpwrak: btw, remember my order of extra-thick acrylic? it arrived finally
2014-08-08 13:17 <whitequark> although I suddenly realize I don't have anything to cut 1" acrylic horizontally with
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2014-08-08 13:49 <whitequark> whoa
2014-08-08 13:49 <whitequark> this book about PCBs I bought is very interesting. I see it has a chapter on Laser Direct Imaging
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2014-08-08 15:00 <whitequark> wtf
2014-08-08 15:00 <whitequark> so I'm trying to lubricate the linear bearings with this PTFE-based lubricant, nonviscous and inert
2014-08-08 15:00 <whitequark> in principle, the best one for this task
2014-08-08 15:00 <whitequark> and they start to work significantly *worse*
2014-08-08 17:50 <whitequark> hm, odd
2014-08-08 17:50 <whitequark> after assembling it back, it works pretty smooth
2014-08-08 18:03 <DocScrutinizer05> odds are the bearings are already made of PTFE, then you just ruined them by basically dissolving the b earing with the lubricant
2014-08-08 18:04 <whitequark> DocScrutinizer05: huh?
2014-08-08 18:04 <whitequark> they are absolutely not, and if they were, that would not be the case
2014-08-08 18:04 <whitequark> a PTFE lubricant is an emulsion of PTFE in some kind of oil
2014-08-08 18:04 <DocScrutinizer05> while I dunno for sure if this is true for PTFE, it is definitely true for using mineral oil based lubricants on usual oil based plastics
2014-08-08 18:04 <whitequark> it's not corrosive nor a solvent
2014-08-08 18:04 <whitequark> yes. for mineral oil plastics, this is true.
2014-08-08 18:05 <whitequark> but not for PTFE. I do have a lubricated PTFE part there, and it came from a factory lubricated with PTFE, and I used it for half a year
2014-08-08 18:05 <whitequark> still it is pretty much intact
2014-08-08 18:05 <whitequark> the bearings are LM22UU
2014-08-08 18:05 <DocScrutinizer05> then nevermind what I said
2014-08-08 18:05 <whitequark> steel balls inside some kind of regular shitty plastic case
2014-08-08 18:06 <whitequark> http://www.mvbbearing.com/products/LMUU/LM12UU.html
2014-08-08 18:06 <DocScrutinizer05> :nod:
2014-08-08 18:06 * DocScrutinizer05 wonders if can copy the URL via VNC to local browser
2014-08-08 18:06 <whitequark> don't bother
2014-08-08 18:06 <whitequark> the page is very uninformative
2014-08-08 18:07 <DocScrutinizer05> anyway IT WORKS \o/
2014-08-08 18:07 <DocScrutinizer05> hal VNC
2014-08-08 18:07 <DocScrutinizer05> hail
2014-08-08 18:08 <DocScrutinizer05> that's really awesome and amazing
2014-08-08 18:08 <whitequark> so, yeah, I first soaked them with dimethoxymethane aerosol to clean grit that was definitely inside
2014-08-08 18:08 <whitequark> I know because when the liquid dried, there was shit all over my floor
2014-08-08 18:08 <whitequark> it made them roll somewhat better
2014-08-08 18:08 <DocScrutinizer05> almost lets me forget the tooth I just broke. 2nd in 3 weeks
2014-08-08 18:09 <whitequark> then I put a LOT of liquid PTFE-based lubricant inside
2014-08-08 18:09 <whitequark> when I tried to manually move the rod, it still didn't move smoothly at all
2014-08-08 18:09 <whitequark> but when I actually assembled it all on the machine frame, it seems to run quite well
2014-08-08 18:09 <whitequark> much better than before, at least
2014-08-08 18:10 <whitequark> I don't know if it's shitty bearing design or merely shitty broken bearings that I now have
2014-08-08 18:10 <DocScrutinizer05> weird
2014-08-08 18:10 <whitequark> since the balls basically ground several depressions in the hardened chrome-plated rods
2014-08-08 18:10 <whitequark> there could be literally anything wrong with the bearings
2014-08-08 18:10 <whitequark> they aren't *supposed* to do that
2014-08-08 18:10 <DocScrutinizer05> considered acrylic dust getting dissolved in your solvent?
2014-08-08 18:10 <whitequark> hm?
2014-08-08 18:11 <whitequark> no, the bearings are closed, and there was no workpiece material inside
2014-08-08 18:11 <DocScrutinizer05> ok
2014-08-08 18:11 <whitequark> also, dimethoxymethane is sold as PCB cleaner, specifically because it doesn't dissolve plastics
2014-08-08 18:11 <whitequark> you don't want a connector to mangle while you clean it
2014-08-08 18:12 <whitequark> however it is really good at removing various kinds of organic residue
2014-08-08 18:12 * DocScrutinizer05 heads out again, too get some USB extension so can put the N900 on the balcony and *maybe* get more than 6KB/s from 3G
2014-08-08 18:12 <whitequark> so that's what I thought, the pressurised stream of dimethoxymethane should dissolve any sticking stuff and get the grit out of bearings
2014-08-08 18:14 <DocScrutinizer05> fsck dentists, they got no clue really
2014-08-08 18:17 <DocScrutinizer05> I mean, when you mill out everything but a 0.5mm thick wall from a cylindricaloid object made of calcium and fill that cavity with epoxy, what do you expect the calcium wall being able to take on mechanical force before it breaks
2014-08-08 18:18 <whitequark> hmmm
2014-08-08 18:18 <whitequark> should've got an implant, no?
2014-08-08 18:18 <DocScrutinizer05> sort of
2014-08-08 18:19 <DocScrutinizer05> 3 weeks ago right lower 7 broke, now left lower 7 same
2014-08-08 18:19 <whitequark> that sucks :/
2014-08-08 18:20 <DocScrutinizer05> indeed
2014-08-08 18:21 <DocScrutinizer05> particularly since detinst "fixed" both less than a year ago, and already fixed the very same problem on left lower a 2 weeks after original work. And that shit cost me 1500
2014-08-08 18:21 <whitequark> wow
2014-08-08 18:22 <DocScrutinizer05> that dentist is not worth her money
2014-08-08 18:23 <DocScrutinizer05> I wonder if there shouldn't be warranty on craftmanship for dentist work as well
2014-08-08 18:23 <whitequark> I think there is?
2014-08-08 18:24 <DocScrutinizer05> on the bright side: it could be worse. both teeth are dead - complete radix nerve removal - iirc
2014-08-08 18:25 <DocScrutinizer05> so at least no pain, except from sharp edges cutting my tongue
2014-08-08 18:25 <DocScrutinizer05> in holiday
2014-08-08 18:27 <DocScrutinizer05> probably you and me both would be the better dentists than this lady. We understand our materials and glue and stuff, right? ;-D
2014-08-08 18:27 <wpwrak> you may want to go to a local dentist to get a temporary filling. that'll be good for some weeks.
2014-08-08 18:29 <wpwrak> that way you won't cut yourself on sharp edges
2014-08-08 18:29 <DocScrutinizer05> it's only 10% of the active surface that's missing now, and I'm afraid some more provisional messing with this tooth will ruin the radix treatment which so far acts fine
2014-08-08 18:29 <whitequark> oooh yes, sharp edges cutting the tongue. I understand you so well
2014-08-08 18:31 * DocScrutinizer05 gets a decent glass of Terry Centenario to forget that shit
2014-08-08 18:32 <larsc> whitequark: always swallow your razors whole
2014-08-08 18:57 <wpwrak> also, do not run your chainsaws at excessive speed while juggling them
2014-08-08 19:01 <whitequark> http://lab.whitequark.org/notes/2014-07-08/cnc3020t-poor-positioning-accuracy/
2014-08-08 19:03 <DocScrutinizer05> I guess what broke away isn't tooth calcium but already some epoxy or acrylate she used last time she tried to fix exactly same issue: http://maemo.cloud-7.de/share-service/20140808_012.jpg
2014-08-08 19:07 <DocScrutinizer05> so trying to get this simply replaced by another blob of acrylic putty might not be the worst idea indeed
2014-08-08 19:08 <whitequark> huh
2014-08-08 19:08 <whitequark> I would use single-component epoxy though, it seems sturdier to me
2014-08-08 19:09 <DocScrutinizer51> I dunno what they use in dentistery nowadays
2014-08-08 19:09 <whitequark> could ask pubmed?
2014-08-08 19:10 <DocScrutinizer51> prolly mostly cyanoacrylate with UV curing
2014-08-08 19:10 <DocScrutinizer51> some harvard shit
2014-08-08 19:11 <DocScrutinizer51> some of the stuff is mildly biozid so can't get used every case
2014-08-08 19:13 <whitequark> mmm, cyanoacrylate
2014-08-08 19:13 <whitequark> UV curing? I thought cyanoacrylate curing is catalyzed by water vapour
2014-08-08 19:15 <wpwrak> prolly some plastic-ceramic mix. and yes, everything with uv curing.
2014-08-08 19:15 <wpwrak> that is, unless it's somewhere inaccessible. then they switch to some concrete
2014-08-08 19:17 <whitequark> interesting
2014-08-08 19:21 <wpwrak> yes ! ubuntu updates chromium to a version without the http://-stripping bug. FINALLY !
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2014-08-08 19:48 <eintopf> :/
2014-08-08 19:48 * eintopf reminds me of the firefox stealing focus bug
2014-08-08 19:49 <eintopf> about years, firefox switching virtual desktop if you opened a url
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2014-08-08 20:45 <fmeerkoetter> I didn't fully grok http://en.qi-hardware.com/wiki/Ben_WPAN - is it currently possible to buy ATUSB devices?
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2014-08-08 22:08 <wpwrak> how to get rid of telemarketers: https://plus.google.com/+ChrisBlasko/posts/GzCuzTyUXNq
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