On Thu, 2 Dec, 2021 at 6:41 PM, Andy Pugh <bodge...@gmail.com> wrote:
To: enhanced machine controller (emc) > On 2 Dec 2021, at 21:14, Todd Zuercher > <to...@pgrahamdunn.com<mailto:to...@pgrahamdunn.com>> wrote: > > What if you used two outer ring gears of the same diameter one with one > fewer teeth. Then have 4 sets of planetaries stacked in pairs. Each pair > would be pinned together -------------- And how do you do that w/o moving the support bearings to the outside ends of the pinions because the armature would get in the way of the pins, co-incidentally requiring the armature to be two disks locked together some how doe to printer limitations on overhangs. While the pinions would simply be long enough to engage the two internal gears. Which can still be triangular shapes with the tips clipped to prevent tip bottoming in the mating spline set. But with pinions that much smaller than the internal splines, the need for an involute shape creeps into the design. So you are back to the large eccentric armature pushing the loose belt as your "pinion". Another point: And with 4 sets of pinions at 90 degrees you would need a 4 tooth difference in tooth count in order for the teeth to be fully engaged every 90 degrees. So the desired gear ratio is half the two sets of pinions case. I had considered such a design, but it would have been too long to fit the place I had to put it. But where length is not a problem, something like that could be knocked up in OpenSCAD in a day or so. ---------------- You can just use pinions twice as long as the ring gears. I think I have seen this done It would work with all-external gears too. _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net<mailto: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
