In the numerical control lathe F refers to the feeding. The speed of feeding speed. It is divided into each and every turn feed feed per minute. Nc machine tool is programmed according to the prior processing program, automatically to be processing parts processing. We put the parts of the processing craft route, process parameters and tool trajectory, displacement, cutting parameters (spindle revolutions, feeding, turning back, etc.) as well as the auxiliary function (in knife, spindle forward, reverse, cutting fluid, etc.), in accordance with the instruction code and procedures prescribed by the CNC machine format write into the processing program list, then this application form on the contents of the records in the control medium (such as punched tape, tape, disk, magnetic bubble memory), and then input to the numerical control machine tool numerical control device, thereby command machine parts.