The Computer Numerical Control  is the essential technology of automatic tools machine. To mill or lathe a piece this technology is able to transform an ISO code generated by a CAM in a movement of the spindle along the various axes of the machine.

TVM usually uses this technology to mills to three or five axes. The CNC then commands and controls the servo drives of the various axes via encoders include the information on their actual position, so as to have a rear-driven system between numerical control and axes.