By making use of Z depth efficiency in error judgement of sampling point and utilizing reliability of vector partition,it can define the cutting error on real time.

• 利用Z高度法效率高的优点，判断采样点是否超差；利用矢量分割法检测结果可靠性高的优点，求解沿着设计曲面的法矢方向以及采样点到刀具扫略体的距离(切削误差)。