This paper introduces the impact of the wheel radius changes to the cam lift value when the camshaft grinder grinds the camshaft,and introduces some methods adopted that in order to solve this problem,and also describes the focus of an application program that is developed based on the NC grinder.

In view of constant-diameter cam mechanism with planar motion roller-follower,the relation between the assembly condition of mechanism and cam motion angles is determined and method of calculating configuration dimensions of mechanism is given too.

Finally, a practical example of this mechanismyoke cam, is conducted, which proves this method, compared with C program, is good in the efficiency, practicability and manmachine interaction.