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hi..i'm interesting in building a planetary gear for this motor :http://www.gngebike.com/belt-chain-motor with a radio of at around 5:1, there are a few issues i see, the first ,is that motor's shaft is 12mm with a keyway , i see sun's bore is 8mm, is it possible to get a sun gear with bigger borethe 2nd issue of mounting, i see no mounting holes on the ring gear, but i see some on yours, did you make them? does this mean i would have to re-make the holes each time i get replacement gear? btw the ring gears seem to be out of stock..
can any one guide me how to make pitch circle dia
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