On Fri, Dec 15, 2017, at 06:16 AM, andy pugh wrote:
> If you look at stock internal gears: > http://www.hpcgears.com/pdf_c33/17.7.pdf > You will find that getting a pair that differ by only one tooth isn't > that easy. And they will differ in PCD. The PCD difference isn't to > hard too deal with in external gears if you can make them big enough > for the corrections not to distort the teeth too much, but it would be > much easier to not have two PCDs on the planets. > So, you would ideally be making your own internal gears. I believe it would be possible to design a similar drive using the same internal gear for both the grounded ring and the output ring. All the gears would have standard tooth forms, and could be off-the-shelf. The trick is that the planet gears centers would have to be at different radii. So instead of the two sets of planet gears running on the same planet carrier pins and being fastened to each other, you would have two sets of planet carrier pins (probably on opposite sides of a planet carrier plate). The planets would all be independent. One set would have N teeth, the other set would have N+1 teeth. The sun gear would be two stacked and coupled gears, one with M teeth (meshing with the N tooth planets) and one with M-2 teeth (meshing with the N+1 planets). Not sure if what I'm describing is still a wolfrom drive, but it would have the same result - a very high reduction from planet to output ring. -- John Kasunich [email protected] ------------------------------------------------------------------------------ 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
