Precision machining of mechanical parts is a type of machining, but it is precision machining. With the development of industry and the continuous changes in demand, precision machining has undergone many changes. Its classification is becoming more and more diverse, and its direction is becoming finer and more specialized. With the development of technology, its technology is constantly improving, and the quality and accuracy of machining are also increasing. The development of technology and economy is closely related to the direction of mechanical development.