The spline sleeve is a linear motion system. When the spline sleeve uses the steel ball in it to move linearly on the precision ground spline shaft, it can transmit torque. Torque can be transmitted when moving linearly on the spline shaft. The spline shaft has a compact structure, can transmit excess load and power, and has a long life. The ball screw shaft is a mechanical element composed of screw, nut, ball and other parts. Its function is to convert rotary motion into linear motion or linear motion into rotary motion. It is a further extension of the traditional sliding screw. The profound significance of this development is the same as the changes brought by rolling bearings to sliding bearings. Due to its excellent friction characteristics, ball screw pairs are widely used in various industrial equipment, precision instruments, and precision CNC machine tools. Especially in recent years, as the linear drive execution unit of CNC machine tools, the ball screw pair has been widely used in the machine tool industry, which has greatly promoted the CNC development of the machine tool industry.