Wenderoth, Lind & Ponack
Throw away inserts
 A polygonal throw away insert includes an insert body having two opposite, parallel major surfaces and a plurality of sides. A cutting edge is formed along a line where each of the sides joins each of the surfaces. A ramp extends from each cutting edge downwardly towards the center of at least one of the two major surfaces of the insert body. A pair of first chip breaking projections are provided on the ramp adjacent each corner of the insert body in a symmetrical relationship with respect to the bisector of the corner, and a second chip breaking projection is provided on the bisector behind the first projections. 
Sumitomo Electric Industries, Ltd.
B Y
B23B Y10T
inventional additional
Yoshikatsu
Mori