Patent ID: 8479622

Claim:
A cutting tool assembly ( 10 , 110 ) for machining a workpiece ( 92 ) comprising: a tool holder ( 12 , 112 ) having a longitudinal axis A extending in a forward to rearward direction (F, R) having a peripheral outer surface ( 20 ) and a front mating end ( 22 , 122 ), and a tool head ( 14 , 114 ) having a rear mating end ( 62 , 162 ) and a forward insert receiving end ( 57 ) with a cutting insert ( 16 ) removably secured therein, the front mating end ( 22 , 122 ) of the tool holder ( 12 , 112 ) comprising: a male or female type tool head coupler ( 23 , 123 ) having a threaded screw bore ( 44 ) therein with a central axis B, and a plurality of abutment wall surfaces ( 48 , 148 ; 50 , 150 ; 52 , 152 ; 54 , 154 ) adjacent a planar supporting surface ( 26 , 126 ), the rear mating end ( 62 , 162 ) of the tool head ( 14 , 114 ) comprising: a male or female type tool holder coupler ( 63 , 163 ) having a through bore ( 70 ) therein, and a plurality of adjacent abutting wall surfaces ( 74 , 174 ; 76 , 176 ; 78 , 178 ; 80 , 180 ) adjacent a planar support surface ( 66 , 166 ), wherein the support surface ( 66 , 166 ) is in contact with the supporting surface ( 26 , 126 ), at least three of the plurality of abutting wall surfaces ( 74 , 174 ; 76 , 176 ; 78 , 178 ; 80 , 180 ) are in contact with at least three of the plurality of abutment wall surfaces ( 48 , 148 ; 50 , 150 ; 52 , 152 ; 54 , 154 ), and a fastening screw member ( 90 ) extends through the through bore ( 70 ) and engages the threaded screw bore ( 44 ), and wherein the at least three of the plurality of abutment wall surfaces ( 48 , 148 ; 50 , 150 ; 52 , 152 ; 54 , 154 ) are non-coplanar and inclined at an acute third angle α to a major plane P 1 containing the longitudinal axis A, when viewed in a direction of the supporting surface ( 26 , 126 ).