The cutting head at each end of the insert is provided with an upper chip surface 13, which is provided with a chip forming device in {HEAD ~ the form} of {TAIL ~ a number} of recesses 14, each of which has concave cross section 
of
The cutting head at each end of the insert is provided with an upper chip surface 13 , which is provided with a chip forming device in { HEAD ~ the form } of { TAIL ~ a number } of recesses 14 , each of which has concave cross section
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH