Combining workpiece and lapping tool movement, this paper derives the movement rule and its path of workpiece relative to lapping tool.It is found that the path is a group of cycloids.

• 在求出工件的运动后，再结合已知的磨具运动，本文分别求出工件相对磨具的运动规律及相对运动轨迹，发现该轨迹是一组摆线。