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Thus, in practice, the points at which lift begins and ends mean that a tangent to the base circle appears on the profile.

A face cam that implements three outputs for a single rotational input is the stereo phonograph, where a relatively constant lead groove guides the stylus and tone arm unit, acting as either a rocker-type (tone arm) or linear (linear tracking turntable) follower, and the stylus alone acting as the follower for two orthogonal outputs to representing the audio signals.

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.

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A once common, but now outdated, application of this type of cam was automatic machine tool programming cams.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

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