Because the cam is a mechanical steering components.
Commands with multiple bends.
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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.
Collateral allocation mechanism.
Leonardo DaVinci had some diagrams involving Cam Mechanisms.
they didnt NO They didn't
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.
Evolution.
A rack and pinion, cam, crank, and screw can do that.
A cam mechanism converts rotational motion into linear or oscillatory motion through the profile of the cam. As the cam rotates, its shape dictates the movement of a follower, which translates the cam's contour into a specific output motion. The design of the cam affects the speed, distance, and timing of the output movement, allowing for precise control in various applications. Thus, the cam's geometry directly influences the relationship between input rotation and output movement characteristics.
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.
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