In the world of machines, there are so many different parts and components. There is such a large number that if you placed them together, they would cover the world. Well, maybe not that many, but the numbers are endless. The important thing to know is, each and every part has its specific use. Some parts provide speed while some provide consistency. Some even provide ease of movement so that other movements are not restricted. In some cases there is a static fixture, while a movable joint propels both parts to the location that is desired. These are called bearings. A certain part of the bearing that is sometimes looked over, are the effective cam followers.