- Reverse the direction of rotation
- Change the speed of rotation
- Move rotational motion to a different axis
- Keep the rotation of two axes synchronized
Gears are read left-to-right when counting ratios (left gear is bigger in a 2:1).
Gears are manufactured such that tooth count is more accurate than circumference in determining gear ratios.
To create large gear ratios, use a gear train.
Worm gears function as “one tooth” gears
and flip the axis of motion 90°.
A planetary gear system uses the same axis for both input and output gear
and is very rugged.
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