Because the cam is a mechanical steering components.
Commands with multiple bends.
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Collateral allocation mechanism.
They can be used to advance or retard the cam timing to correct inaccuracies in the cam or change the characteristics of the cam profile.
Leonardo DaVinci had some diagrams involving Cam Mechanisms.
they didnt NO They didn't
Evolution.
A cam toy is made with a mechanism to make it move or make sound, It may operate on a simple mechanism such as a small circular piece of wood/plastic which rotates inside the toy to make it move.
A rack and pinion, cam, crank, and screw can do that.
When you turn a cam, the rod stays on it for the whole time. So if you cut out or add a piece to the cam, it changes the affect on how high or low the action goes.
Theater Provided Equipment
In some engines the lifter bore is offset in relation to the cam lobe. In others the cam lobes are tapered from side to side