whitequark | wpwrak: btw, remember my order of extra-thick acrylic? it arrived finally | 13:16 |
---|---|---|
whitequark | although I suddenly realize I don't have anything to cut 1" acrylic horizontally with | 13:17 |
whitequark | whoa | 13:49 |
whitequark | this book about PCBs I bought is very interesting. I see it has a chapter on Laser Direct Imaging | 13:49 |
whitequark | wtf | 15:00 |
whitequark | so I'm trying to lubricate the linear bearings with this PTFE-based lubricant, nonviscous and inert | 15:00 |
whitequark | in principle, the best one for this task | 15:00 |
whitequark | and they start to work significantly *worse* | 15:00 |
whitequark | hm, odd | 17:50 |
whitequark | after assembling it back, it works pretty smooth | 17:50 |
DocScrutinizer05 | odds are the bearings are already made of PTFE, then you just ruined them by basically dissolving the b earing with the lubricant | 18:03 |
whitequark | DocScrutinizer05: huh? | 18:04 |
whitequark | they are absolutely not, and if they were, that would not be the case | 18:04 |
whitequark | a PTFE lubricant is an emulsion of PTFE in some kind of oil | 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 | 18:04 |
whitequark | it's not corrosive nor a solvent | 18:04 |
whitequark | yes. for mineral oil plastics, this is true. | 18:04 |
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 | 18:05 |
whitequark | still it is pretty much intact | 18:05 |
whitequark | the bearings are LM22UU | 18:05 |
DocScrutinizer05 | then nevermind what I said | 18:05 |
whitequark | steel balls inside some kind of regular shitty plastic case | 18:05 |
whitequark | http://www.mvbbearing.com/products/LMUU/LM12UU.html | 18:06 |
DocScrutinizer05 | :nod: | 18:06 |
Action: DocScrutinizer05 wonders if can copy the URL via VNC to local browser | 18:06 | |
whitequark | don't bother | 18:06 |
whitequark | the page is very uninformative | 18:06 |
DocScrutinizer05 | anyway IT WORKS \o/ | 18:07 |
DocScrutinizer05 | hal VNC | 18:07 |
DocScrutinizer05 | hail | 18:07 |
DocScrutinizer05 | that's really awesome and amazing | 18:08 |
whitequark | so, yeah, I first soaked them with dimethoxymethane aerosol to clean grit that was definitely inside | 18:08 |
whitequark | I know because when the liquid dried, there was shit all over my floor | 18:08 |
whitequark | it made them roll somewhat better | 18:08 |
DocScrutinizer05 | almost lets me forget the tooth I just broke. 2nd in 3 weeks | 18:08 |
whitequark | then I put a LOT of liquid PTFE-based lubricant inside | 18:09 |
whitequark | when I tried to manually move the rod, it still didn't move smoothly at all | 18:09 |
whitequark | but when I actually assembled it all on the machine frame, it seems to run quite well | 18:09 |
whitequark | much better than before, at least | 18:09 |
whitequark | I don't know if it's shitty bearing design or merely shitty broken bearings that I now have | 18:10 |
DocScrutinizer05 | weird | 18:10 |
whitequark | since the balls basically ground several depressions in the hardened chrome-plated rods | 18:10 |
whitequark | there could be literally anything wrong with the bearings | 18:10 |
whitequark | they aren't *supposed* to do that | 18:10 |
DocScrutinizer05 | considered acrylic dust getting dissolved in your solvent? | 18:10 |
whitequark | hm? | 18:10 |
whitequark | no, the bearings are closed, and there was no workpiece material inside | 18:11 |
DocScrutinizer05 | ok | 18:11 |
whitequark | also, dimethoxymethane is sold as PCB cleaner, specifically because it doesn't dissolve plastics | 18:11 |
whitequark | you don't want a connector to mangle while you clean it | 18:11 |
whitequark | however it is really good at removing various kinds of organic residue | 18:12 |
Action: 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 | 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 | 18:12 |
DocScrutinizer05 | fsck dentists, they got no clue really | 18:14 |
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 | 18:17 |
whitequark | hmmm | 18:18 |
whitequark | should've got an implant, no? | 18:18 |
DocScrutinizer05 | sort of | 18:18 |
DocScrutinizer05 | 3 weeks ago right lower 7 broke, now left lower 7 same | 18:19 |
whitequark | that sucks :/ | 18:19 |
DocScrutinizer05 | indeed | 18:20 |
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 | 18:21 |
whitequark | wow | 18:21 |
DocScrutinizer05 | that dentist is not worth her money | 18:22 |
DocScrutinizer05 | I wonder if there shouldn't be warranty on craftmanship for dentist work as well | 18:23 |
whitequark | I think there is? | 18:23 |
DocScrutinizer05 | on the bright side: it could be worse. both teeth are dead - complete radix nerve removal - iirc | 18:24 |
DocScrutinizer05 | so at least no pain, except from sharp edges cutting my tongue | 18:25 |
DocScrutinizer05 | in holiday | 18:25 |
DocScrutinizer05 | probably you and me both would be the better dentists than this lady. We understand our materials and glue and stuff, right? ;-D | 18:27 |
wpwrak | you may want to go to a local dentist to get a temporary filling. that'll be good for some weeks. | 18:27 |
wpwrak | that way you won't cut yourself on sharp edges | 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 | 18:29 |
whitequark | oooh yes, sharp edges cutting the tongue. I understand you so well | 18:29 |
Action: DocScrutinizer05 gets a decent glass of Terry Centenario to forget that shit | 18:31 | |
larsc | whitequark: always swallow your razors whole | 18:32 |
wpwrak | also, do not run your chainsaws at excessive speed while juggling them | 18:57 |
whitequark | http://lab.whitequark.org/notes/2014-07-08/cnc3020t-poor-positioning-accuracy/ | 19:01 |
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 | 19:03 |
DocScrutinizer05 | so trying to get this simply replaced by another blob of acrylic putty might not be the worst idea indeed | 19:07 |
whitequark | huh | 19:08 |
whitequark | I would use single-component epoxy though, it seems sturdier to me | 19:08 |
DocScrutinizer51 | I dunno what they use in dentistery nowadays | 19:09 |
whitequark | could ask pubmed? | 19:09 |
DocScrutinizer51 | prolly mostly cyanoacrylate with UV curing | 19:10 |
DocScrutinizer51 | some harvard shit | 19:10 |
DocScrutinizer51 | some of the stuff is mildly biozid so can't get used every case | 19:11 |
whitequark | mmm, cyanoacrylate | 19:13 |
whitequark | UV curing? I thought cyanoacrylate curing is catalyzed by water vapour | 19:13 |
wpwrak | prolly some plastic-ceramic mix. and yes, everything with uv curing. | 19:15 |
wpwrak | that is, unless it's somewhere inaccessible. then they switch to some concrete | 19:15 |
whitequark | interesting | 19:17 |
wpwrak | yes ! ubuntu updates chromium to a version without the http://-stripping bug. FINALLY ! | 19:21 |
eintopf | :/ | 19:48 |
Action: eintopf reminds me of the firefox stealing focus bug | 19:48 | |
eintopf | about years, firefox switching virtual desktop if you opened a url | 19:49 |
fmeerkoetter | I didn't fully grok http://en.qi-hardware.com/wiki/Ben_WPAN - is it currently possible to buy ATUSB devices? | 20:45 |
wpwrak | how to get rid of telemarketers: https://plus.google.com/+ChrisBlasko/posts/GzCuzTyUXNq | 22:08 |
--- Sat Aug 9 2014 | 00:00 |
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