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A simple displacement diagram illustrates the follower motion at a constant velocity rise followed by a similar return with a dwell in between as depicted in figure 2.However, the most common type is in the valve actuators in internal combustion engines. The cam can be a simple tooth, as 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 (back and forth) motion in the follower, which is a lever making contact with the cam. a cylinder with an irregular shape) that strikes a lever at one or more points on its circular path.Here, the cam profile is commonly symmetric and at rotational speeds generally met with, very high acceleration forces develop.Ideally, a convex curve between the onset and maximum position of lift reduces acceleration, but this requires impractically large shaft diameters relative to lift.Face cams may also be used to reference a single output to two inputs, typically where one input is rotation of the cam and the other is radial position of the follower. These were once common is mechanical analog computation and special functions in control systems.

Face cams may provide repetitive motion with a groove that forms a closed curve, or may provide function generation with a stopped groove.

A once common, but now outdated, application of this type of cam was automatic machine tool programming cams.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.

The purpose and detail of implementation influence whether this application is called a cam or a screw thread, but in some cases, the nomenclature may be ambiguous.

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.

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