Drill motor gearBox question

[Paul Copioli]

Dennis,

For each planetary set, the gear ratio can be calculated as follows:

1. the small gear in the middle is the sun gear, the internal gear (the one with the teeth on the inside also called the fixed gear) is called the ring gear.

2. the gear ratio for each stage is calculated as folows:

# of teeth on ring gear
------------------------------ + 1
# of teeth on sun gear

3. Multiply each stage's gear ratio together to get the total ratio. If in high speed, the second stage gear ratio is 1; so only multply the 1st and the 3rd stages.


-Paul