A crank is a lever attached to a rotating shaft. Sometimes the crank is used to turn a shaft - for instance when it is used as a handle, and sometimes the crank is driven by the rotating shaft. In this case, the crank can be used to change the type of motion.
	A crank can convert a rotating motion into a reciprocating motion. This means that if you attach a rod to the central pin of the crank above, the rod will go up and down.
	see the Geneva Wheel working

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