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21 Jul

Non-invertible functions, which require the groove to self-intersect, can be implemented using special follower designs.A variant of the face cam provides motion parallel to the axis of cam rotation.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.

A face cam of this type generally has only one slot for a follower on each face.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.Applications include machine tool drives, such as reciprocating saws, and shift control barrels in sequential transmissions, such as on most modern motorcycles.A special case of this cam is constant lead, where the position of the follower is linear with rotation, as in a lead screw.