On Wednesday 10 March 2021 12:58:08 John Dammeyer wrote: > Hi Sam, > I found by making the wall thickness bigger along with the hole > smaller and hub larger I was able to mount the hub on the lathe and > bore both the bore and the outer part of the hub on the lathe to make > them symmetrical. That reduced a lot of wobble compared to earlier > versions. > > In hindsight I would also have made some sort of holder that allowed > me to skim the inside of the actually pulley part. Instead I used > sandpaper because as you can see it has the same roughness from the 3D > printer as your toothed belt section has. > > The hub was a smooth press fit (by hand) in and out of the pulley > part. The photo showing it mounted still has the yellow pulley that > had too small of a hub and the pressure from the set screw cracked it. > So the new green one has a wider set screw area. > > I suspect the biggest issue with your flex pulley would be holding it > stable enough so you could skim away material. Might even be best to > print it with a flat face to hold it round. Then mount it in a > holder, skim the inside surface and then cut through the face at the > back. The flat face could even have mounting holes to mount onto the > back of your plate. This would keep it from turning in the mount > while you skim it. > I've got a better idea, since LCNC can do a taper, taper the holder 2 thou, drive it all the way in so its gripped good, bore it to half that taper, pull it out, turn the other face and repeat w/o touching the x dial. Just make sure all the burrs on the teeth from the printer are well cleaned off with a fresh blade in a box knife. Burrs will show as wibbles in the bore if you dont. :(
> John > > > From: Sam Sokolik [mailto:[email protected]] > > > > another update - at 1/2 step - the discrete resolution should be > > about 40,000 divisions per rotation. .009 deg. > > > > https://www.youtube.com/watch?v=IdfKre6zpEY > > > > On Thu, Feb 4, 2021 at 4:00 PM Sam Sokolik <[email protected]> wrote: > > > https://www.youtube.com/watch?v=ZVVffljc7kE 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
