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