Patent ID: 8568065

Claim:
An insert holder ( 22 ), for retaining a tangential cutting insert, the insert holder ( 22 ) comprising: a holder front surface ( 30 ); and an insert pocket ( 26 ) comprising: a rear surface ( 38 ); a bottom surface ( 36 ); and a base surface ( 40 ) comprising an insert fastening hole ( 58 ) and three spaced apart base abutment protuberances, including a first, a second and a third base abutment protuberance ( 52 , 54 , 56 ), wherein: the first and second base abutment protuberances ( 52 , 54 ) are located between the holder front surface ( 30 ) and the insert fastening hole ( 58 ); the third base abutment protuberance ( 56 ) is located between the insert fastening hole ( 58 ) and the rear surface ( 38 ) of the insert pocket ( 26 ); the second base abutment protuberance ( 54 ) is further from the bottom surface ( 36 ) than the third base abutment protuberance ( 56 ); the third base abutment protuberance ( 56 ) is further from the bottom surface ( 36 ) than the first base abutment protuberance ( 52 ); and the first, second and third base abutment protuberances ( 52 , 54 , 56 ) comprise first, second and third base abutment surfaces ( 60 , 62 , 64 ), respectively.