Sorry, here is the video https://youtu.be/dLNDGUISTYM?t=9m38s
NOTICE. We see the first set of planetary gears THEN the guy reaches over and picks up the SECOND set of sun/planet gears and shows how the assemble onto the shaft. The neat part about Toyota design is ease of assembly./disassembly. Not a wrench to be seen. But there you have it a duel ring planetary system from junk yard parts if you want. and helical cut as well. I also notice the comment about bicycle 2-speed hubs. THAT is great. What is the typical reduction in one of these? I'm building robots too. On Thu, Dec 21, 2017 at 9:39 AM, Chris Albertson <[email protected]> wrote: > > > On Thu, Dec 21, 2017 at 2:12 AM, Gene Heskett <[email protected]> > wrote: > >> 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? >> > > I wrote that before I figured out how to see the video. On eBay you can > fin harmonic drives. They do the something(roughly 1:100 reduction) but > actually better accuracy. > Here are a few: ebay.com/sch/i.html?_nkw=harmonic+drive... > <https://www.ebay.com/sch/i.html?_nkw=harmonic+drive&_in_kw=1&_ex_kw=&_sacat=0&_mPrRngCbx=1&_udlo=50&_udhi=275&_ftrt=901&_ftrv=1&_sabdlo=&_sabdhi=&_samilow=&_samihi=&_sadis=15&_stpos=90278&_sargn=-1%26saslc%3D1&_salic=1&_sop=12&_dmd=1&_ipg=50> > > > >> > 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, >> > > Maybe a better source of parts would be a Toyota Prius viable ratio > transmission. It is already set up with planet gears that match the ring. > The parts come off without even needing tools. > See the ring and planet gear on the left and center of this video. Junk > yard price is about $300. Also notice the two electric motors. They could > like be repurposed. > > >> >> -- > > Chris Albertson > Redondo Beach, California > -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ 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
