Ball screw is an ideal product that converts rotary motion into linear motion, or converts linear motion into rotary motion. The ball screw is composed of a screw, a nut and a ball. Its function is to convert rotary motion into linear motion, which is a further extension and development of ball screws. The important significance of this development is to change the bearing from rolling motion to sliding motion. Because of its small frictional resistance, ball screws are widely used in various industrial equipment and precision instruments. High-precision linear motion can be achieved under high load conditions.