Mechanical precision machining, also known as precision machining, is different from ordinary machining. It requires more precision than ordinary machining. He mainly uses the processing machine to change the size of the workpiece. According to the processed workpiece temperature state can be divided into two kinds, cold processing and thermal processing. This is called cold working when it is processed at room temperature but does not cause chemical and physical changes in the workpiece. Processes above or below ambient temperature can cause chemical or physical changes in the workpiece. This is called thermal processing. Cold processing in accordance with the differences in processing methods can be divided into cutting and pressure processing, this type of processing equipment used in the processing requirements are higher, even to the auxiliary fluid, etc., this type of main production of some small parts more. The common heat processing is mainly heat treatment, forging, casting and welding, etc. This type of work is mainly done with some large workpieces.