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The most common type has the follower ride in a slot so that the captive follower produces radial motion with positive positioning without the need for a spring or other mechanism to keep the follower in contact with the control surface.A face cam of this type generally has only one slot for a follower on each face.A once common, but now outdated, application of this type of cam was automatic machine tool programming cams.Each tool movement or operation was controlled directly by one or more cams.In the most common type, the follower rides in a groove cut into the surface of a cylinder.

Cylindrical cams may also be used to reference an output to two inputs, where one input is rotation of the cylinder, and the second is position of the follower axially along the cam. These were once common for special functions in control systems, such as fire control mechanisms for guns on naval vessels A face cam produces motion by using a follower riding on the face of a disk.Cams used for function generation may have grooves that require several revolutions to cover the complete function, and in this case, the function generally needs to be invertible so that the groove does not self intersect, and the function output value must differ enough at corresponding rotations that there is sufficient material separating the adjacent groove segments.A common form is the constant lead cam, where displacement of the follower is linear with rotation, such as the scroll plate in a scroll chuck.A common example is the camshaft of an automobile, which takes the rotary motion of the engine and translates it into the reciprocating motion necessary to operate the intake and exhaust valves of the cylinders.Certain cams can be characterized by their displacement diagrams, which reflect the changing position a roller follower (a shaft with a rotating wheel at the end) would make as the cam rotates about an axis.

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