{HEAD ~ The cam mechanism} is coupled to {TAIL ~ 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 the workpiece in relation to the tool 
{ HEAD ~ The cam mechanism } is coupled to { TAIL ~ 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 the workpiece in relation to the tool
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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