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