Nc machine tool Numerical control machine tool is in the form of a numeric code information (application instructions), control cutting tools according to the given working procedure, the movement speed and trajectory for automatic processing machine tools, CNC machine for short. The characteristics of Nc machine tools has extensive adaptability, processing object changes only need to change the input of program instruction; Higher than average automatic machine processing performance, can accurate processing complexity, which is suitable for small and medium-sized batch processing, frequent modification, high precision and complicated shape and artifacts, and can obtain good economic results. With the development of numerical control technology, the use of numerical control system of machine tool varieties increased, lathe, milling machine, boring machine, drilling machine, grinding machine, gear processing machine, electric spark machine tool and so on. In addition to automatic tool change, a fake card for machining processing center, turning center, etc. The development history of In 1948, parsons, companies in the United States, entrusted by the U.S. air force aircraft propeller blade profile