Patent ID: 8702353

Claim:
A tangential cutting insert ( 10 ) comprising two opposing side surfaces ( 12 ) and a peripheral surface ( 14 ) extending therebetween, the peripheral surface ( 14 ) comprising four identical end surfaces ( 18 ), each end surface ( 18 ) extending between two adjacent end surfaces ( 18 ); each end surface ( 18 ) and each side surface ( 12 ) intersect at a major edge ( 20 ), at least a portion of the major edge ( 20 ) being a major cutting edge ( 22 ); each end surface ( 18 ) and each adjacent end surface ( 18 ) intersect at a minor edge ( 24 ), at least a portion of the minor edge ( 24 ) being a minor cutting edge ( 26 ), the major cutting edges ( 22 ) being longer than the minor cutting edges ( 26 ); each of the major and minor cutting edges ( 26 ) of a respective end surface ( 18 ) have a rake surface ( 34 ) associated therewith in the respective end surface ( 18 ), the rake surface ( 34 ) extending in a inward direction of the cutting insert ( 10 ); wherein, in a side view of the cutting insert ( 10 ) the major cutting edges ( 22 ) are concave.