... CHAPTER 7CAM, TOGGLE, CHAIN,AND BELT MECHANISMSSclater Chapter 7 5/3/01 12:32 PM Page 199A cam is a mechanical componentthat ... curves.Fig. 7 A technique formachining circular-arccams. Radii r2and r5areturned on a lathe; hard-ened templates areadded to r1, r3, and r4forfacilitating hand filing.Sclater Chapter 7 5/3/01 ... motion.During the dwells of the rocker, forexample, a dwell is cut into the cam.Sclater Chapter 7 5/3/01 12:33 PM Page 206207FIFTEEN IDEAS FOR CAM MECHANISMSThis assortment of devices reflects the variety...