Cam Shape(ct) 3. Cylindrical cam(圆柱凸轮) or barrel cam The roller follower operates in a groove cut on the periphery of a cylinder. The follower may translate or oscillate. If the cylindrical surface is replaced by a conical one, a conical cam results 4. End ca(端面凸轮) This cam has a rotating portion of a cylinder. The follower translates or oscillates whereas the cam usually rotates The end cam is rarely used because of the cost and the difficulty in cutting its contourCam Shape(ct) 3. Cylindrical cam （圆柱凸轮）or barrel cam : The roller follower operates in a groove cut on the periphery of a cylinder. The follower may translate or oscillate. If the cylindrical surface is replaced by a conical one, a conical cam results. 4. End cam （端面凸轮）: This cam has a rotating portion of a cylinder. The follower translates or oscillates, whereas the cam usually rotates. The end cam is rarely used because of the cost and the difficulty in cutting its contour