A cam-follower mate is a type of tangent or coincident mate. It allows you to mate a cylinder, plane, or point to a series of tangent extruded faces, such as you would find on a cam. You can make the profile of the cam from lines, arcs, and splines, as long as they are tangent and form a closed loop.
The following picture shows three followers which stay in contact with the cam as it rotates.
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To add a cam-follower mate:
Click Mate
on the Assembly toolbar, or click Insert,
Mate.
Under Advanced Mates, click Cam
.
Under Mate Selections, select the tangent
faces on the cam for Entities to Mate
.
Right-click one of the faces
and click Select Tangency. This
selects all the tangent faces in one step.
Click in Cam follower and select a face or vertex on the cam follower.
Click 
.
The follower is mated to all of the cam surfaces, allowing the follower to stay in contact with the cam as it rotates.
A cam-follower mate for a cam made from a set of tangent
surfaces appears in the FeatureManager design tree as CamMateCoincident
or CamMateTangent. A cam-follower
mate for a cam made from a single surface appears as Coincident
or Tangent.