Page 302 - Cam Design Handbook

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290 CAM DESIGN HANDBOOK

(a) Machining center (note carousel tool changer at top left).

(b) Milling cylindrical cam. (c) Milling radial cam.
FIGURE 10.4. CNC cam machining. (Courtesy Mallory Industries Inc., Farmington Conn.)

Standard plate and barrel cams are typically rough milled, leaving approximately
0.012in grinding stock per side, are stress relieved to remove residual machining stresses,
and then are hardened and finally ground to finish dimensions. Grinding is usually required
to remove distortions from the heat treating phase. Some of the smaller cams can be
milled to size and ion-nitrided. Proper feeds and spindle speeds must be maintained to
prevent excessive cutter wear and deflections. Also grinding wheel breakdown must be
monitored and is usually compensated by eccentric grinding wheels. Operators must peri-