In operation, a user moves the belt sander along the guide rails while {HEAD ~ the abrasive surface} contacts {TAIL ~ the exterior surface} of the work piece to smooth the exterior surface of the work piece 
contacts
In operation , a user moves the belt sander along the guide rails while { HEAD ~ the abrasive surface } contacts { TAIL ~ the exterior surface } of the work piece to smooth the exterior surface of the work piece
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH