SMD planetary gearbox where the sun gear is the driver and the ring gear is stationary. The reduction depends on how many teeth the sun, planet and ring gears have.
Planetary gear sets can achieve a ratio of 3: 1 to 10: 1 and if further reduction is required, SMD will offer double and triple planet sets where reductions can be made from 100: 1 to 1000: 1.
