Metal cutting is the process of cutting excess material from the workpiece with a tool to obtain the required parts such as shape, dimensional accuracy and surface quality. To achieve this cutting process, there must be three conditions: there must be relative movement between the workpiece and the tool, that is, the cutting movement; The tool material must have certain cutting performance; The tool must have appropriate geometric parameters, i.e. cutting Angle, etc. Metal cutting process is through the machine tool or hand-held tools to carry out cutting, its main methods are turning, milling, planing, grinding, drilling, boring, gear processing, marking, saw, file, scraping, research, reaming, tapping, sleeve thread and so on. Although its forms are diverse, they have common phenomena and laws in many aspects, which are the common basis for learning various cutting processing methods.