{HEAD ~ The impact surface} is vibrated in {TAIL ~ the clearance} between the tool and the profile of the workpiece, so as to de burr the latter 
is vibrated in
{ HEAD ~ The impact surface } is vibrated in { TAIL ~ the clearance } between the tool and the profile of the workpiece , so as to de burr the latter
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH