A MATHEMATICAL-MODEL FOR A SHORT-CUT OF THE NC TOOL PATH IN WINDOW-FRAME OPERATION

A mathematical model is developed in this paper to represent a short c ut for generating NC tool paths in window-frame operation. The paths f or face milling of flat convex polygon surfaces are considered. The sh ort cut of the tool path is found to be a function of the cutter radiu s, the position of the starting point, and the magnitude of the vertex angle at the starting point of the path. Combining the concept of a s hort cut, the length of tool path will be cut down and the machining w ill be more efficient. An example and some results are adduced to expl ain and verify the model.