The recesses 14 are provided to give the insert a positive chip angle of 5° to 30° so as to enable {HEAD ~ plastic deformation} of {TAIL ~ the chip} such that it becomes easier to break 
The recesses 14 are provided to give the insert a positive chip angle of 5 ° to 30 ° so as to enable { HEAD ~ plastic deformation } of { TAIL ~ the chip } such that it becomes easier to break
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