350 DESIGN OF MACHINERY CHAPTER 8 Vfollower Vfollower Vfollower Follower Follower Follower Spring Spring Spring Cam Cam Cam ①cae cam cam (a)Roller follower (b)Mushroom follower (c)Flat-faced follower FIGURE 8-3 Three common types of cam followers A three-dimensional cam or camoid(not shown)is a combination of radial and 8 axial cams.It is a two-degree-of-freedom system.The two inputs are rotation of the cam about its axis and translation of the cam along its axis.The follower motion is a function of both inputs.The follower tracks along a different portion of the cam depending on the axial input. Cam Half joint Follower N Vfollower FIGURE 8-4 Axial,cylindrical,or barrel cam with form-closed,translating follower