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  1. MarkH111

    Planetary gear train calculations

    Hello, I am designing an orrery (a mechanical model of of the solar system), im a geotechnical engineer by trade so I'm not fresh on calculating more complex gear ratios. I have a system within the orrery where I want to reduce 365 rpm to 13.36rpm. I can rationalize 13.36 to 334/25 teeth in...

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