A lapping machine is a grinding machine that grinds the surface of a workpiece with a lap that is coated or embedded with abrasive. It is mainly used for grinding high-precision planes, inner and outer cylindrical surfaces, conical surfaces, spherical surfaces, thread surfaces and other profiles in workpieces. The main types of grinders are disc grinders, rotary grinders and various special grinders. The grinder control system uses PLC as the control core, and the text display is the control mode of the human-machine dialogue interface. The man-machine dialogue interface can talk to people about equipment maintenance, operation, faults, etc.; the operation interface is intuitive and convenient, program control, and operation is simple. For all-round security considerations, misoperations in abnormal conditions are invalid. Real-time monitoring, faults, error alarms, and easy maintenance. Grinding machine shift control method, the grinding process has three stages, namely the start stage, the formal stage and the end stage. At the beginning stage, the grinding tool rotates at a constant speed, the official stage of the grinding tool rotates at a constant speed, and at the end stage, the grinding tool rotates at a reduced speed. Improve the performance of the grinder, improve the shape of the grinder, and make it practical and commercialized for wider application.