According to shape

1. Knife-edge follower

It is quite simple in construction. However its use is limited as it produces a great wear of the surface at the point of contact.

2. Roller follower

It is a widely used cam follower and has a cylindrical roller free to rotate about a pin joint, at low speeds, the follower has a pure rolling action, but a high speeds, some sliding also occurs.

In case of steep rise, a roller follower jams the cam and, therefore, is not preferred.