Computer numerical control machine tool is an automatic machine tool with program control system. The control system can logically process a program with control coding or other symbolic instructions and decode it so that the machine can move and process parts. Referred to as CNC, also known as CNC machine, CNC lathes, Hong Kong and guangdong pearl river delta area known as computer gong. Compared with the ordinary machine tools, CNC machine has the following characteristics: low machining accuracy high, has the stable machining quality. Low for multi-axis linkage, to processing complicated shape parts; Machining parts is changed, generally only need to change the CNC program, can save production preparation time; 's high precision and large rigidity, the machine itself can choose favorable processing amount, high productivity (generally 3 ~ 5 times of ordinary machine tool). Machine tool automation degree is high, can reduce labor intensity; Low to the operating personnel's quality request is higher, to the maintenance personnel of the higher technical requirements.