Chapter 1 What is a Ball Screw We discuss construction of the ball screws in this section Section 1 Variety of Screws Screws Sliding contact screws Ball screws Roller screws Rolling contact screws Triangular thread screws Acme thread lead screws Others Triangular thread screws • Used to fasten two objects • Move a nut linearly by rotating a screw Acme thread lead screw • Used to move things or to transfer forces