The cam mechanism is coupled to the workpiece holder by drive means and is driven so as to impart an oscillatory pivotal movement to the workpiece holder while rotating the workpiece holder, thereby effecting a predetermined pattern of movement of {HEAD ~ the workpiece} in {TAIL ~ relation} to the tool 
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The cam mechanism is coupled to the workpiece holder by drive means and is driven so as to impart an oscillatory pivotal movement to the workpiece holder while rotating the workpiece holder , thereby effecting a predetermined pattern of movement of { HEAD ~ the workpiece } in { TAIL ~ relation } to the tool
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH