Form of centralized processing with extended to other types of CNC machine tools, such as turning center, it is on the CNC lathe configure multiple automatic tool change device, can control the coordinates of three or more, in addition to turning, spindle can halt or index, while the cutting tool rotating milling, drilling, reaming and tapping process, suitable for processing complex of revolving parts.

　　Machining center according to the arrangement of main shaft is divided into two categories, vertical and horizontal. Horizontal machining center general indexing turntable or nc rotary table, each side can be processed workpiece; Also can make multiple coordinate joint movement, so that machining complex curved surface.

　　Vertical machining center is generally not take turntable, only for top surface processing. In addition, there are vertical, lie two spindle type machining center, and the spindle can be adjusted to lie down shaft or vertical stand adjustable processing center, they can to five workpiece surface processing.

　　Processing center automatic tool change device by storage library and change cutter knife. Knife library is a lot of more phyletic, the common disc and chain. The capacity of the larger chain inventory put knife tools.