Page 323 - Cam Design Handbook
P. 323
THB10 9/19/03 7:28 PM Page 311
CAM MANUFACTURING 311
Cam
Translating
Follower
(a) Straight rib.
Cam Follower
Stud
Cam
Follower
no. 2
Cam no. 1
(b) Tapered rib. (c) Conjugate cams.
FIGURE 10.22. External double roller on cam.
adjustment is sometimes provided for reducing backlash and preloading the roller. In
Fig. 10.21b we see concentric rollers of the same diameter but in a relieved groove. The
undercut is difficult to produce accurately. The last type, and the most acceptable, is shown
in Fig. 10.21c, where we see two concentric rollers of different diameters in a stepped
groove.
external double roller on cam: In Fig. 10.22 are shown positive-drive double
rollers on double surfaces. Figure 10.22a indicates a globoidal cam having a straight rib
and a translating follower. Figure 10.22b has a tapered rib with a globoidal cam and an
oscillating follower. An excellent choice for radial cams is realized by the application of
conjugate or complementary cams, Fig. 10.22c. This arrangement is flexible and accurate
and minimizes misalignment of contacting parts. It is also reliable for high-speed, high-
mass systems giving low noise and low vibration. In all three cam followers shown, pre-