A cam is generally a disc or a cylinder mounted on a rotating shaft, which gives a special motion to a follower, through direct contact. The cam profile is determined by the required follower motion and the design of the type of follower.CAM is used and can be used to produce almost any item created by a machine or tool. It can be used to create models from metal, plastic and even wood. Its main roles are: Tool path designs create computer models of new designs.