Mathematical formulas are derived comprehensively and systematically for the profile coordinate, pressure Angle and radius of curvature of the cylindrical CAM with an oscillating roller follower.

The coordinate changing method used to bring the CAM theory profile of the eccentricity rotor tri-proportion controller was introduced in this paper.

The coordinate value of corresponding profile may be obtained quickly so long as the length of the chord of arbitrary oblique section is computed, without solving the complex equation of the surface.