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Gearing Systems : Rack and Pinion

A rack and pinion consists of a pinion gear and a linear gear called the rack. The teeth of rack are similar to that of a spur gear, except the teeth on the rack are basic trapezoids making it easy to create a tool to cut these. Refer to the image below.

Rack and pinion

The purpose of a rack and pinion is not to gear the motor down. Instead the rack and pinion setup is normally used to convert a rotary motion into a linear motion. It is possible to backdrive a rack and pinion which means a break should be included in the setup.

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