Control machine tools including CNC lathe, CNC lathe is just one of the nc machine tools, CNC machine tool include machining center, pipe threading, boring machine, planer, and so on and so on. Nc machine tool is digital control machine tools (Computer numerical control machine tools) for short, is a kind of a program control system of automatic machine tools. The control system is able to handle the with logic control code or other symbols in accordance with procedures prescribed by the instruction, and the decoding, with code Numbers, through information carrier type numerical control device. After processing the numerical control device and a variety of control signals, control the action of machine tool, according to the shape and size of the drawing requirements, automatically to parts processing. Nc machine tools is better solved the complex, precision, small batch and many varieties of parts processing, is a kind of flexible, highly efficient automation of machine tools, represents the development direction of modern machine tool control technology, is a typical mechatronics product.