Thanks Andy, I'll look into that. I have another question. From that document on the cup based harmonic drive the designer created the ellipse shaped holder for the bearings.
OTOH, the one Sam built uses two diametrically opposed larger bearings. >From my perspective most of the bearings in the cup based are effectively >useless. Seems better to use either one larger one at each end or 3 smaller >ones as close as possible together. I have a number of 13mm bearings with 5mm >holes although they are very close to the edge of the ellipse. Or is the >larger diameter bearing easier on the flex gear cup (or belt like Sam used)? John > From: Andy Pugh [mailto:bodge...@gmail.com] > > On 28 Nov 2021, at 04:44, John Dammeyer <jo...@autoartisans.com> wrote: > > > > And look at creating the flex part from steel since I have gear cutters > > and an arbor. > > The ideal profile is not an involute. There is a sketch of it somewhere in > the HD website. > >
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