Tool path generation method is the most important and the most extensive and in-depth content for the free-form surface parts NC-machining. In the multi-axis NC-machining

tool path influences on the precision and efficiency of machining. The routine method of calculating tool path is the method using the ideal tool profile. Put forward taking advantage of the actual tool profile. To machine the complex surface

usege of the actual tool profile is put forward. Through detecting the actual profile of rotating cutter

to use the actual profile to calculate tool path of machining the known surface. This method can improve the machining precision effectively

and can detect the new production knives whether standards-compliant or not. The method applies to tool path calculation of rotary cutter.