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