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<whitequark>
wpwrak: btw, remember my order of extra-thick acrylic? it arrived finally
<whitequark>
although I suddenly realize I don't have anything to cut 1" acrylic horizontally with
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<whitequark>
whoa
<whitequark>
this book about PCBs I bought is very interesting. I see it has a chapter on Laser Direct Imaging
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<whitequark>
wtf
<whitequark>
so I'm trying to lubricate the linear bearings with this PTFE-based lubricant, nonviscous and inert
<whitequark>
in principle, the best one for this task
<whitequark>
and they start to work significantly *worse*
<whitequark>
hm, odd
<whitequark>
after assembling it back, it works pretty smooth
<DocScrutinizer05>
odds are the bearings are already made of PTFE, then you just ruined them by basically dissolving the b earing with the lubricant
<whitequark>
DocScrutinizer05: huh?
<whitequark>
they are absolutely not, and if they were, that would not be the case
<whitequark>
a PTFE lubricant is an emulsion of PTFE in some kind of oil
<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
<whitequark>
it's not corrosive nor a solvent
<whitequark>
yes. for mineral oil plastics, this is true.
<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
<whitequark>
still it is pretty much intact
<whitequark>
the bearings are LM22UU
<DocScrutinizer05>
then nevermind what I said
<whitequark>
steel balls inside some kind of regular shitty plastic case
* DocScrutinizer05
wonders if can copy the URL via VNC to local browser
<whitequark>
don't bother
<whitequark>
the page is very uninformative
<DocScrutinizer05>
anyway IT WORKS \o/
<DocScrutinizer05>
hal VNC
<DocScrutinizer05>
hail
<DocScrutinizer05>
that's really awesome and amazing
<whitequark>
so, yeah, I first soaked them with dimethoxymethane aerosol to clean grit that was definitely inside
<whitequark>
I know because when the liquid dried, there was shit all over my floor
<whitequark>
it made them roll somewhat better
<DocScrutinizer05>
almost lets me forget the tooth I just broke. 2nd in 3 weeks
<whitequark>
then I put a LOT of liquid PTFE-based lubricant inside
<whitequark>
when I tried to manually move the rod, it still didn't move smoothly at all
<whitequark>
but when I actually assembled it all on the machine frame, it seems to run quite well
<whitequark>
much better than before, at least
<whitequark>
I don't know if it's shitty bearing design or merely shitty broken bearings that I now have
<DocScrutinizer05>
weird
<whitequark>
since the balls basically ground several depressions in the hardened chrome-plated rods
<whitequark>
there could be literally anything wrong with the bearings
<whitequark>
they aren't *supposed* to do that
<DocScrutinizer05>
considered acrylic dust getting dissolved in your solvent?
<whitequark>
hm?
<whitequark>
no, the bearings are closed, and there was no workpiece material inside
<DocScrutinizer05>
ok
<whitequark>
also, dimethoxymethane is sold as PCB cleaner, specifically because it doesn't dissolve plastics
<whitequark>
you don't want a connector to mangle while you clean it
<whitequark>
however it is really good at removing various kinds of organic residue
* 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
<whitequark>
so that's what I thought, the pressurised stream of dimethoxymethane should dissolve any sticking stuff and get the grit out of bearings
<DocScrutinizer05>
fsck dentists, they got no clue really
<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
<whitequark>
hmmm
<whitequark>
should've got an implant, no?
<DocScrutinizer05>
sort of
<DocScrutinizer05>
3 weeks ago right lower 7 broke, now left lower 7 same
<whitequark>
that sucks :/
<DocScrutinizer05>
indeed
<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
<whitequark>
wow
<DocScrutinizer05>
that dentist is not worth her money
<DocScrutinizer05>
I wonder if there shouldn't be warranty on craftmanship for dentist work as well
<whitequark>
I think there is?
<DocScrutinizer05>
on the bright side: it could be worse. both teeth are dead - complete radix nerve removal - iirc
<DocScrutinizer05>
so at least no pain, except from sharp edges cutting my tongue
<DocScrutinizer05>
in holiday
<DocScrutinizer05>
probably you and me both would be the better dentists than this lady. We understand our materials and glue and stuff, right? ;-D
<wpwrak>
you may want to go to a local dentist to get a temporary filling. that'll be good for some weeks.
<wpwrak>
that way you won't cut yourself on sharp edges
<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
<whitequark>
oooh yes, sharp edges cutting the tongue. I understand you so well
* DocScrutinizer05
gets a decent glass of Terry Centenario to forget that shit
<larsc>
whitequark: always swallow your razors whole
<wpwrak>
also, do not run your chainsaws at excessive speed while juggling them