Gear

Rotating circular machine part with teeth that mesh with another toothed part

A gear or gearwheel, also called a toothed wheel, or cog is a rotating machine part typically used to transmit rotational motion or torque by means of a series of "teeth" that engage with compatible teeth of another gear or other part. The teeth can be integral saliences or cavities machined on the part, or separate pegs inserted into it. In the latter case, the gear is usually called a cogwheel.

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