NC machine tool must adapt to high-speed, high efficiency, and high degree of automation features CNC general should include universal tool, universal connectivity and a few special shank tool holders. To join the tool shank and head mounted on the machine power, and therefore has been gradually standardized and serialized. CNC tool classified in many ways. Depending on the tool structure can be divided into: ① monolithic; ② mosaic, using welding or machine clip connector, clamp type can be divided into two types and indexing can not indexable; ③ special type, such as composite tools, minus shock-type tool. According to the materials used in manufacturing tools can be divided into: ① high-speed steel cutting tools; ② carbide cutting tools; ③ diamond tools; ④ other materials, tools, such as cubic boron nitride cutting tools, ceramic cutting tools. From the cutting process can be divided into: ① turning tools, particularly round bore, thread, cutting tools and other; ② drilling tools, including drills, reamers, taps, etc; ③ boring tools; ④ milling tools, etc. . CNC machine tools in order to adapt to the durable, stable, easy to tune, and other requirements can be changed in recent years, machine clip indexable cutting tool has been widely used in the amount of 30% to 40% of the entire CNC tool, metal removal accounted for 80% to 90% of the total.