[OK fair warning, this is a long form exploration rather than a quick flashy demo!]

Join me behind the scenes for an in-depth exploration of the process I'm taking to completely redo the venerable 6497 watch movement. You've seen this assembly many times in CAD, mainly due to the popularity of a particular user's Grabcad upload. We are all indebted to this model (and to the longevity and robustness of the original 6497 design!)

Anyway, I've gone back to square one and using a variety of tools & techniques at my disposal in Onshape, some up with a robust, parametric, flexible approach. No imports, this is all native Onshape. It also factors in some of the real-life design considerations (endshake allowance, etc) as well as using accurate cycloidal gear teeth profile rather than approximations.