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