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Thread: Planetary gear ratio design help needed

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    Planetary gear ratio design help needed

    I am building a unique planetary gearset and I need help finding the correct pitch diameters to give me a 10:1 ratio. It is based on a friction drive so there are no teeth. the sun gear will be my input, the planet gear will rotate around my sun gear driving the output and the ring gear will be fixed. My planet gear will be 1.225" dia. This is limited by the materials I have available so it's a fixed dia. I need to know what size to make the sun gear to get the correct ratio. I tried to figure it out but I am not sure my calculations are correct - actually I am pretty sure they are wrong... can anyone help?


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    An open mind is a virtue...so long as all the common sense has not leaked out.


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    What is the ring gear diameter? Do you want to use the same 1.225" for the sun gear?


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