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