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3 stage planetary gearbox — image 1
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3 stage planetary gearbox

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Planetary gearbox, input and output are 1/2 in hex shaft. Gearbox has a ratio of aprox 52.73:1

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Creative Commons — Public Domain

3 stage planetary gearbox, designed to run with an FRC CIM motor, but it can be used with whatever.

If you want to print this to use with a motor, make sure to print in a filament like nylon or PETG/PCTG. I tried with PLA and it melted as soon as I spun the motor up.

Uses 12x 1in 10-32 bolts and 12x 1/2 in 10-32 bolts, both should be countersunk but you could potentially skip the 1/2 in bolts depending on how well the 1in bolts hold the gear carrier parts together.

Ill link the Onshape file in case it helps you assemble the gearbox

https://cad.onshape.com/documents/c942869c50bd69b2b53022e9/w/55b29751b32d2e8ab11b7ecf/e/50e3d8f669b6c1c342d128f9