The shape of CNC lathe is similar to that of ordinary lathe, that is, it is composed of bed, headstock, tool rest, feed system, pressure system, cooling and lubrication system, etc. The feed system of CNC lathes is qualitarily different from that of ordinary lathes. The traditional ordinary lathes have feed box and exchange gear frame, while the CNC lathes directly use servo motor to drive the slide plate and the tool rest through the ball screw to achieve feed movement, so the structure of the feed system is greatly simplified. Generally, it can automatically complete the processing of cylindrical surface, conical surface, spherical surface and thread, but also can process some complex rotary surface, such as hyperboloid.