An apparatus for machining a workpiece to {HEAD ~ a predetermined contour} in {TAIL ~ accordance} with a reference pattern comprises a cam mechanism which defines the reference pattern 
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An apparatus for machining a workpiece to { HEAD ~ a predetermined contour } in { TAIL ~ accordance } with a reference pattern comprises a cam mechanism which defines the reference pattern
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH