Ball screws are ideal for converting rotary motion into linear motion, or linear motion into rotary motion. Ball Screws are the most commonly used transmission element on tool machinery and precision machinery, and their main function is to convert rotary motion into linear motion, or torque into axial repetitive force, and at the same time both high precision, reversibility and high efficiency. Because of its small frictional resistance, Ball Screws are widely used in various industrial equipment and precision instruments. Ball screw consists of screw, nut, steel ball, pre-pressurized piece, reverser and duster. Its function is to convert rotary motion into linear motion. When the ball screw is used as the active body, the nut will be converted into linear motion with the rotation angle of the screw in accordance with the corresponding specifications of the guide, and the passive workpiece can be connected with the nut through the nut holder and the nut, so as to realize the corresponding linear motion.