[team222badbrad]

Tonight I investigated the gear ratios.

I do not know how to calculate planetary gear ratios, so here are the #'s

The sun gear attached to the motor is a 9 tooth which meshes with 3 16 tooth planet gears and they mesh with a 42 tooth stationary ring gear.

These gearboxes have 2 stages the first set of planet gears is plastic, while the second set is metal along with the whole ring gear assembly.

The second stage is basically a repeat of the first stage with the sun gear attached to the planet carrier and in the last stage the planet carrier is the output.

Can anyone tell me how to calculate the gear ratio for this?