Vaseline ..... cheap .... grease FDA silicon based is better .... but you talk about PLA which is the water soluble part .... so when you increase the speed make sure that there is no water inside or humidity .... the temperature and the water increase the disintegration of this plastic. PET plastic based is better choice for these purpose, more strong and durable.
Some printing PETs are mixed with plastics which make it more flexible. In USA you have a good choice of filaments and for good prices too. regards bkt Il giorno gio 23 lug 2020 alle ore 22:45 Gene Heskett <[email protected]> ha scritto: > On Thursday 23 July 2020 15:26:06 Chris Albertson wrote: > > > I would very much like to hear what the experts at Mobile say, if you > > can get an answer from them. > > > > But what I do is save fail and redesigned printed parts so I can do > > experiments on them like testing of Epoxy or CA glue is best or just > > put them in a vice and bend 'till they break. I've never done grease > > and oil tests but you likely have enough reject parts not to at least > > test of the oil dissolves PLA or not > > > > They say PLA is made of corn oil and is biodegradable. But I've yet > > to see any biodegradation even with part soaked in water. > > > > But I do see very fast wear with PLA parts. If I put a steel shaft on > > a PLA bearing the bearing hole gets worn out. What I found is I can > > but bronze bushings and pres fit them in the PLA hole. Oilite bronze > > on steel works well untill in get hot and melts the PLA. Another > > solution is skateboard bearings. These are cheap > > > > The best harmonic redcer designs I've need use bearing for the pins so > > the PLA is not needing to rub on a pin. > > > > I've foubd PLA does not like friction so pressed in sleave or sealed > > bearinbg units are best. and these are really cheap on eBay and can be > > re-used on furute projects many times. But plain bearing made of PLA > > just don't last. > > > > On Thu, Jul 23, 2020 at 12:01 PM Gene Heskett <[email protected]> > wrote: > > > Greetings all; > > > > > > Slow, makes watching grass grow exciting... 3h:40m into making the > > > housing cup, its claiming 6% done. And still doing infill for the > > > end wall stuck on the bed. > > > > > > Someone said that it will need grease and mentioned the silicon > > > stuff used in power tool gear boxes. But one of the features of si > > > stuff is its total lack of surface tension which generally prevents > > > actual contact between the parts. And thats good. Thats what the EP > > > of a grease is all about. But I've no clue how PLA and petro based > > > greases get along, so what is the best grease for PLA parts? Do we > > > have to use si based stuff which equals a higher wear rate to keep > > > the PLA from deteriorating from the petro based grease? > > > > > > Inquiring minds would like to hear the merits discussed. Or should > > > I call the Mobil Oil warehouse in Omaha and put it to the real > > > experts? > > > > > > Thanks all. > > Thanks for all the replies from everybody. > > But except for the anecdotal stuff, PLA is basically missing inaction in > the link supplied. Since PLA is supposedly vegetable based, I think I'll > try canaba wax, which should, once the solvent naptha has evaporated, > leaves a hard, non-stick coating on the PLA. Might be an interesting > experiment as I get the impression it would have the cahones from a 3NM > motor, to turn the bs-1's worm under a cutting load. I have a much larger > 100/1 gear box for that if this fails. > > =================== > > As for calling Mobil, the last time I did that it was getting on into cold > weather in 1973, with a Nebraska ETV transmitter that needed a barrel of > tech grade ethylene glycol for antifreeze. I found a barrel, sitting just > inside the dock door in Omaha and bought it, but I probably ran the > station's LD bill up as I called all over the country looking for it. > > It was scheduled to be shipped to Sprague in Lincoln the next monday, who > would share it with Cornel-Dubilaire in makeing electrlolytic capacitors. > Due to the OPEC embargo, it turned out to be the last barrel of tech grade > in the country, and I got it for KXNE for $8.50/gallon. They hadn't paid > mobil for it yet and I had a state PO in hand. > > Car antifreeze can't be used due to the high voltages involved, the anti > this and that additives make it almost a shorrt circuit, and the additives > would have killed a couple thousand in deionizer cartridges just undoing > what 1 gallon of auto antifreeze would have done to the system. So I > single-handedly caused the capacitor shortage in the service industry that > winter of 73 by putting Sprague abd C-D out of the business. > > One of those now it can be told stories. > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/gene> > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
