Patent ID: 8449225

Claim:
A cutting tool ( 40 ) comprising an insert holder ( 42 ) and a cutting insert ( 10 ), the insert holder ( 42 ) comprising: a block portion ( 44 ) and a clamping portion ( 46 ) for retaining the cutting insert ( 10 ) and defining a forward to rearward direction, the block portion ( 44 ) having upper and lower blocks ( 48 , 50 ) defining an upper to lower direction and a resilient slot ( 49 ) between them and an upper block front face ( 61 ) at a forward end of the upper block ( 48 ) and a lower block front face ( 72 ) at a forward end of the lower block ( 50 ); the clamping portion ( 46 ) having upper and lower jaws ( 74 , 76 ) integrally formed with the block portion ( 44 ), the upper jaw ( 74 ) projecting forwardly from one side of the upper block front face ( 61 ) and having an upper jaw surface ( 84 ), the lower jaw ( 76 ) projecting forwardly from the one side of the lower block front face ( 72 ) and having a lower jaw surface ( 90 ) facing opposite the upper jaw surface ( 84 ); wherein, the lower jaw ( 76 ) has a cutting portion support ( 93 ), the cutting portion support ( 93 ) projects transversely at an angle α from the forward end of the lower jaw ( 76 ), the cutting portion support ( 93 ) has a generally upward facing cutting portion support surface ( 100 ); the cutting insert ( 10 ) has a shaft ( 20 ) having shaft top and bottom surfaces ( 24 , 26 ) and opposing side surfaces ( 23 , 25 ) which extend therebetween, a first cutting portion ( 22 ) integrally formed with the shaft ( 20 ), the first cutting portion ( 22 ) projects transversely to the shaft ( 20 ) at the angle α from a first shaft end, the first cutting portion ( 22 ) has opposing cutting portion top and bottom surfaces ( 27 , 28 ) and opposing cutting portion side surfaces ( 29 , 30 ) which extend between the cutting portion top and bottom surfaces ( 27 , 28 ), the cutting portion top surface ( 27 ) and the cutting portion side surfaces ( 29 , 30 ) meet at an edge ( 31 ), at least a portion of which forms a cutting edge ( 32 ), wherein, in the assembled position of the cutting tool ( 40 ), the upper jaw surface ( 84 ) abuts the shaft top surface ( 24 ), the lower jaw surface ( 90 ) abuts the shaft bottom surface ( 26 ) and the cutting portion support surface ( 100 ) abuts the cutting portion bottom surface ( 28 ); and wherein the cutting portion bottom surface ( 28 ) is non-planar.