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 relation to {TAIL ~ the tool} 
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 relation to { TAIL ~ 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 OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL