Patent ID: 8388271

Claim:
A cutting tool assembly ( 20 ) comprising: a holder ( 22 ) comprising: a holder front surface ( 40 ); opposing holder top and bottom surfaces ( 30 , 32 ) and first and second holder side surfaces ( 34 , 36 ) extending therebetween; and a recess ( 46 ), having a recess side surface ( 48 ), formed on the first holder side surface ( 34 ) and extending rearwardly from the holder front surface ( 40 ), and a recess top surface ( 52 ) adjacent the recess side surface ( 48 ) and formed on the holder top surface ( 30 ); and an adapter ( 24 ) removably secured to the holder ( 22 ), the adapter ( 24 ) comprising: an insert clamping portion ( 28 ); opposing adapter top and bottom surfaces ( 58 , 60 ), and adapter inner and outer side surfaces ( 62 , 64 ) extending therebetween; and an adapter side plate ( 68 ) protruding transversely from the adapter inner side surface ( 62 ), the adapter side plate ( 68 ) having an adapter side plate rear surface ( 74 ) adjacent the adapter inner side surface ( 62 ) and an adapter side plate front surface ( 72 ); wherein: the adapter inner side surface ( 62 ) abuts the recess side surface ( 48 ); the adapter side plate rear surface ( 74 ) abuts the holder front surface ( 40 ) at a holder front surface portion ( 106 ) that is adjacent to the first holder side surface ( 34 ); in a bottom view of the holder ( 22 ), the holder front surface portion ( 106 ) forms an internal acute angle α with the first holder side surface ( 34 ); and in a bottom view of the adapter ( 24 ), the adapter side plate rear surface ( 74 ) forms the acute angle α with the adapter inner side surface ( 62 ).