When the abrasive surface contacts the exterior surface of the work piece, it does so in {HEAD ~ a direction} that is transverse to {TAIL ~ a longitudinal axis} of the work piece 
is transverse to
When the abrasive surface contacts the exterior surface of the work piece , it does so in { HEAD ~ a direction } that is transverse to { TAIL ~ a longitudinal axis } of the work piece
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH