I see a flaw in the design which may explain the comment in the video
about the action being rough: the sun gear has 17 (a prime number)
teeth while the ring gear has 45 (3*3*5) teeth. That means there is
only one position in which the two will align to permit a planet gear
with an even number of teeth (these have 16 (2*2*2*2).
-- 
Mike Hungerford
http://users.sdccu.net/chthulhu2/models.html
Kore de ii no da.

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