Patent ID: 8690495

Claim:
A cutting tool, comprising: one or more cutting portions including a cutting insert, a wedge for clamping the cutting insert, a slot formed in a body of the cutting tool and receiving the wedge, and an insert seat recessed within a side surface of the slot and receiving the cutting insert; said insert seat having a radial inner side surface, a bottom supporting surface on which the cutting insert is seated, and a lateral supporting surface outwardly extending from the radial inner side surface and the bottom supporting surface, said cutting insert having a polygonal top surface, a bottom surface supported by the bottom supporting surface of the insert seat, and a plurality of side surfaces connecting between the top surface and the bottom surface, wherein the top surface of the cutting insert comprises a recessed portion having a plurality of inclined abutment surfaces which are inclined toward the center of the top surface of the cutting insert, an outline of said recessed portion being twisted at a twist angle α with respect to an outline of the top surface of the cutting insert, and wherein the wedge includes a projecting portion that contacts one of the inclined abutment surfaces and pushes the cutting insert so that two side surfaces of the side surfaces of the cutting insert can be supported by the radial inner side surface and the lateral supporting surface of the insert seat.