This is the best and most durable DIY drive I've seen. One improvement for the future is to make the internal tooth gears from something other than 3D printed plastic. Perhaps you can cast them in epoxy and fiber composite. If you used a timing belt as part of the mold the cast teeth would be as perfect as the belt.
I can imagine the mold is the square aluminum part with roughened up internal pocket. Then stretch a belt over a disk and place the disk in the pocket leaving a ring then pour in the epoxy. With luck the epoxy bonds with the aluminum but not with the rubber belt. Perhaps the belt is coated in mould release wax. On Wed, Mar 10, 2021 at 7:58 AM Sam Sokolik <samco...@gmail.com> wrote: > 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 > > > > On Tue, Feb 2, 2021 at 9:46 AM Gene Heskett <ghesk...@shentel.net> > wrote: > > > >> On Tuesday 02 February 2021 08:30:56 Sam Sokolik wrote: > >> > >> > I have looked at cycloidal drives and feel that they have too many > >> > parts :) > >> > > >> > Gene > >> > https://www.youtube.com/watch?v=Gx263nnTrqY > >> > > >> > Ran for over 6 hours like that - about 850rpm input. > >> > > >> I am highly impressed. > >> > >> Now finish the housing, and hang a load on it, like the worm of a BS-1 > >> while making another worm to replace the crappy worm in the Chinese > >> BS-1. That worm is doomed to a higher wear rate, a fact I'm becoming > >> aware of as I exercise this BS-1 servo for tuning. > >> > >> That is why I bought the ender3, but I was using O.P's code which was > >> crappy code IMO. Turns out the ender3 can make stuff a heck of a lot > >> better that the code I could DL from thingiverse. I now have the > >> extruder motor on the x carriage, moving a modified stock hot end, and > >> while its slower than some because the heating is only once the filament > >> is in the nozzle, dozens of times more dependable than the stock setup. > >> No clogging from cold filament because the hot stuff backs up into the > >> heat sink and freezes. > >> > >> I think this loose ring idea has the most promise of making a long > >> lasting drive, and shorter axially than any design so far. Please > >> continue. > >> > >> Thank you Sam S. > >> > >> > On Thu, Jan 28, 2021 at 3:13 AM andrew beck <andrewbeck0...@gmail.com > > > >> > > >> > wrote: > >> > > Guys just to chime in here. > >> > > > >> > > Sam went don't you design a cycloidal drive instead. They are easy > >> > > to make on a normal 3 axis Cnc mill with a end mill and much more > >> > > rigid than a harmonic drive. As they are not so fragile. I'm > >> > > planning on making some on my VMC soon. I don't understand why > >> > > use a harmonic drive. (I actually have a big harmonic drive here > >> > > from a robot. ) > >> > > > >> > > On Thu, 28 Jan 2021, 18:53 Bari, <bari00...@gmail.com> wrote: > >> > > > On 1/27/21 10:55 AM, Sam Sokolik wrote: > >> > > > > Nice being able to make things while I sleep.. > >> > > > > > >> > > > > 2 outside side rings - one 202 teeth - one 200 teeth. > >> > > > > Inside flex ring - 200 teeth. Feels good - for what it is.. > >> > > > > > >> > > > > > http://electronicsam.com/images/greenmachine/IMG_20210127_104237 > >> > > > >.jpg > >> > > > > > http://electronicsam.com/images/greenmachine/IMG_20210127_104628 > >> > > > >.jpg > >> > > > > > http://electronicsam.com/images/greenmachine/IMG_20210127_104354 > >> > > > >.jpg > >> > > > > >> > > > Timing belts will take the flex > >> > > > > >> > > > https://www.youtube.com/watch?v=Y8ZELQdgBbU > >> > > > > >> > > > https://www.youtube.com/watch?v=2YC-0C8oPUo > >> > > > > >> > > > > >> > > > Cycloid prototype under microscope > >> > > > > >> > > > https://www.youtube.com/watch?v=um5GMOBgz6s > >> > > > > >> > > > > >> > > > Hybrid planetary/harmonic drive - check out how they made it flex > >> > > > > >> > > > https://www.youtube.com/watch?v=sdRGrTHq4hA > >> > > > > >> > > > > >> > > > > >> > > > _______________________________________________ > >> > > > 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 > >> > > >> > _______________________________________________ > >> > Emc-users mailing list > >> > Emc-users@lists.sourceforge.net > >> > https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> > >> 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 > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
