{HEAD ~ The cam mechanism} is mounted on {TAIL ~ a carrier assembly}, on which is mounted a rotary workpiece holder for positioning a workpiece in relation to a machining tool 
{ HEAD ~ The cam mechanism } is mounted on { TAIL ~ a carrier assembly } , on which is mounted a rotary workpiece holder for positioning a workpiece in relation to a machining 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