A cam is a rotating or sliding piece in a mechanical linkage used especially in trasforming rotary motion or vice-versa. It is often a part of a rotating whell or shaft (e.g. a cylinder with an irregular shape) that strikes a lever at one or more points on its circular path. The cam is used to deliver pulses of power to a steam hammer, for example, or an eccentric disc or other shape that produces a smooth reciprocating motion in the follower.
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