Gears are mechanisms that mesh together via teeth and are used to transmit rotary motion from one shaft to another. Gears are defined by two important items: radius and number of teeth. They are typically mounted, or connected to other parts, via a shaft or base.

Gears can serve as an efficient means to reverse the direction of motion, change rotational speed, or to change which axis the rotary motion is occurring on. The sizes of the gears usually depend on the desired gear ratio and the shaft upon which the gears will be mated.

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