On Wednesday 19 August 2020 12:09:05 Gene Heskett wrote: > On Wednesday 19 August 2020 10:25:14 Greg Bernard wrote: > > Most hardware stores carry silicone grease for o-rings in the > > plumbing section. I'd be willing to bet it would work just fine for > > your purpose. > > Thats similar to DC-4, and I have some of that but its 60 yo. > "Borrowed" it while building titan ones up in SD in '60. But as a > lubricant, not to good, -0 surface tension. So I didn't think of it. > > Its running on a thin film of Lymans Super Moly barrel grease, seems > happy but its young yet. Running nicely at noon yet, at about 15 rpm > out, sounds like maybe 1000 revs in. Can't stop it by hand. More > making. > > Looked at printers, thought I'd found one in the Saphire, till I read > the reviews, zero support, crappily made, 9 reviews, all complaining. > Thumbs down. > But the cyclic noise seemed to be getting worse, like the tips of the splines were starting to drag again. So I took it apart, and found something else that bothers me, in addition to the motor mount screw back out an making a slight mark on the carrier, all 3 of the bearing carriers I have printed are .2mm non symmetrical, as in one center bearing runs .2mm farther from the shaft than the other. This is causing the whole cup to wobble and it can be seen and felt in the output flange. Greased the inside of the cup. Went to garage and got a dial and found that on an inch dial, only around a thou difference. Put a bigger stator ring in it about .3mm bigger, just enough to make the bolts drag going back in. Back to running till? At max divisor and about 250 kilohertz steps. This gave it a just detectable backlash. Way more than that in the BS-1's worm at best setting. Which may be where this one is going if I don't destroy it first And I'm trying to find the weakest link here. Another thing of note, at .5 amps a coil, the current mapping of these tb6560's sucks dead toads thru soda straws, the microstepping is nowhere linear. And makes the iron complain vocipherously.
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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
