Getting closer... I have to drill a bunch of holes in the face plate... also have to preload the wheel bearing (grind a bit from the center)
http://electronicsam.com/images/greenmachine/IMG_20210313_201227.jpg On Fri, Mar 12, 2021 at 10:41 AM Gene Heskett <ghesk...@shentel.net> wrote: > 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:samco...@gmail.com] > > > > > > 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 <samco...@gmail.com> > 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 > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
