First, in order to ensure that the thread of the guide, processing spindle rotation week, the feed of the tool must be equal to the thread of the guide, the feed is larger; in addition, the strength of the threaded tool is generally poor, so the threaded tooth type is often not once processed, the need for many times for cutting.

X, Z for the thread end point (point C) coordinates; U, W starting point coordinates to the end point coordinates of the incremental value; R for the cone thread end point radius and the starting point radius of the difference between the R value of positive and negative judgement and G90 the same way, cylindrical threads R = 0, can be omitted; F for the pitch value.