On Thursday 21 December 2017 04:18:46 Chris Albertson wrote: > To make this really work for rotary tables you need a very fine pitch. > I have seen these 3D printed in plastic but they slip and don't > handle much torque because the outer ring deforms > One idea I had was to press fit the plastic ring gear into a short > section of steel pipe. > > Put you can buy these drives already made for about $250. That is > really not abad price for arc-second level precision and near zero > backlash. > Where?
> On Wed, Dec 20, 2017 at 10:15 PM, Lawrence Glaister <[email protected]> wrote: > > very cool Gene.... had some troubles playing the video, but I seem > > to have the gist of it. It does seem like a very interesting design > > for rotary tables.... just have to figure out how to re-purpose some > > rear end ring gears and pinions.... hmmm... was thinking of > > regearing the jeep anyway!. Lawrence Glaister VE7IT Now theres a recipe for some bigger machinery, > > > > On 2017-12-20 07:36 PM, Gene Heskett wrote: > >> On Wednesday 20 December 2017 15:06:20 Gene Heskett wrote: > >> > >> On Wednesday 20 December 2017 12:36:57 [email protected] wrote: > >>>> I got my first prototype working. It came out to be 60:1. > >>>> sun = 15 > >>>> first planet = 15 > >>>> first ring = 45 > >>>> second planet = 14 > >>>> second ring = 45 > >>>> I have a short video but can not post it here > >>> > >>> Need more details plz. Like did you make or source the gears etc. > >>> And there's lots of places on the net to put a video, even my site > >>> (see sig) is available if you send it to me via a pm. I'll figure > >>> where to put it and make a link. Biggest problem is my upload back > >>> to the viewer is only about 2.5 Mbits/Sec. So playback may > >>> stumble. But at least it will be out there... > >>> > >>> Cheers, Gene Heskett > >> > >> Grumpy's video is now on my site in the sig, with a link from the > >> front page. Enjoy. Sure, its only plywood, but it works as a proof > >> of concept. I may see if I can make one in steel, with bearings. In > >> wood, its certainly compact compared to a worm and eccentric bull > >> gear. > >> > >> > >> Cheers, Gene Heskett > > > > ------------------------------------------------------------ > > ------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
