CNC machine generally consists of the following several parts: host, it is the main part of the nc machine tool, including the machine body, columns, spindle and feed mechanism such as mechanical parts. It is used to complete a variety of machining parts. Numerical control device, is the core of the nc machine tool, including hardware (printed circuit board, CRT displays, the key box, paper tape reader, etc.), and the corresponding software for the digital parts of the program, and complete the input information storage, data transform, interpolation algorithm and implement various control functions. Low drive, it is a CNC machine tool drive components of the actuator, including spindle drive unit, feed unit, spindle motor and feed motor, etc. The main shaft and feed drive are realized by electrical or electro-hydraulic servo system under the control of numerical control device. When several feed linkage, can complete positioning, straight line, plane curve and spatial curve processing. Assist device, index of machine tool some necessary supporting parts, to ensure the operation of the nc machine tools, such as cooling and chip removal, lubrication, lighting, monitor, etc. It includes hydraulic and pneumatic device, chip removal device, switching table, numerical control turntable and numerical control dividing head. Programming, and other ancillary equipment, can be used to in closed parts of programming, storage, etc.