First, the normal vector of the surface was calculated using the differential geometry based on the features of an involute and a cycloid as a reference of radius of the ball milling cutter.

• 由于铣刀每完成一个行程后，还要进行轮廓插补，采用一种新的渐开线轮廓插补方法，并将插补轨迹换算成球头铣刀的刀心轨迹。