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Ideally, a convex curve between the onset and maximum position of lift reduces acceleration, but this requires impractically large shaft diameters relative to lift.Thus, in practice, the points at which lift begins and ends mean that a tangent to the base circle appears on the profile.

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Each tool movement or operation was controlled directly by one or more cams.

Instructions for producing programming cams and cam generation data for the most common makes of machine were included in engineering references well into the modern CNC era.

Displacement diagrams are traditionally presented as graphs with non-negative values.

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.

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.

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 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.Non-invertible functions, which require the groove to self-intersect, can be implemented using special follower designs.A face cam of this type generally has only one slot for a follower on each face.In some applications, a single element, such as a gear, a barrel cam, or other rotating element with a flat face, may do duty as a face cam in addition to other purposes.The base circle is the smallest circle that can be drawn to the cam profile.

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