On the perimeter of a head (14) that is bonded on one end of the shank (12) of a T-shaped cutter, multiple end cutting edge sections (16) with a cutting edge (16a) on the tip side of the T-shaped cutter (10) and multiple upper edge sections (18) with a cutting edge (18a) on the base end side are disposed alternating in the circumferential direction of the T-shaped cutter. The cutting edges (16a, 18a) of the end cutting edge sections (16) and the upper edge sections (18) form an integral structure with the shank (12) and the head (14).

A T-slot cutter (1) is a tool for cutting a T-groove in a workpiece, and includes a body (2A) and an insert portion (3). The insert portion (3) is fixed to a leading end portion of the body (2A) using screws (8). The insert portion (3) is configured by overlaying inserts (4) and (5). By changing a combination of the inserts configuring the insert portion (3), a groove width and an angular shape of the T-groove cut in the workpiece can be easily adjusted. On mating faces of the inserts (4, 5), convex portions and concave portions of the mating face of the insert (4) overlap with concave portions and convex portions of the mating face of the insert (5). As a result, the inserts (4, 5) partially overlap with each other in a thickness direction, and thus a protrusion length of the insert portion (3) can be shortened.

A cutting tool according to one aspect of the present disclosure includes an attaching portion, a cutting portion having a core portion and a surface portion, and a joint portion. The attaching portion includes a hard component and a hard material. The hard component is at least one selected from the group consisting of TiC, TiCN, W, WC, Al.sub.2O.sub.3, and a combination of at least one of CBN and diamond and at least one of W and WC. The hard material includes one or two or more types of iron group elements, and has a Young's modulus of not more than 350 GPa. The core portion includes a cemented carbide material. The surface portion includes PCD or CBN. The cutting portion has a chamfer portion. The surface portion includes a groove, a flank face, and a cutting edge. The cutting edge extends toward the attaching portion.

A cutting tool according to one aspect of the present disclosure includes an attaching portion, a cutting portion having a core portion and a surface portion, and a joint portion. The attaching portion includes a hard component and a hard material. The hard component is at least one selected from the group consisting of TiC, TiCN, W, WC, Al.sub.2O.sub.3, and a combination of at least one of CBN and diamond and at least one of W and WC. The hard material includes one or two or more types of iron group elements, and has a Young's modulus of not more than 350 GPa. The core portion includes a cemented carbide material. The surface portion includes PCD or CBN. The cutting portion has a chamfer portion. The surface portion includes a groove, a flank face, and a cutting edge. The cutting edge extends toward the attaching portion.

A T-slot router bit for simultaneously cutting a T-slot groove into a work piece and withdrawing pieces of cut work piece from the T-slot groove in a single pass. The T-slot router bit includes a shank end, a boring end opposite to the shank end, a shank that extends from the shank end and is adapted to engage with a chuck of a router, a body that extends from the shank to the boring end and defines a T-shaped configuration, a pair of helical flutes of the body that extends between the shank and the boring end, and a pair of cutting edges that extends between the shank and the boring end.

A T-slot cutter (1) is a tool for cutting a T-groove in a workpiece, and includes a body (2A) and an insert portion (3). The insert portion (3) is fixed to a leading end portion of the body (2A) using screws (8). The insert portion (3) is configured by overlaying inserts (4) and (5). By changing a combination of the inserts configuring the insert portion (3), a groove width and an angular shape of the T-groove cut in the workpiece can be easily adjusted. On mating faces of the inserts (4, 5), convex portions and concave portions of the mating face of the insert (4) overlap with concave portions and convex portions of the mating face of the insert (5). As a result, the inserts (4, 5) partially overlap with each other in a thickness direction, and thus a protrusion length of the insert portion (3) can be shortened.

A cutting insert having a first coupling structure, a tool holder having a complementary second coupling structure with a seat for a milling tool system, and a milling tool system having a cutting insert and a holder are all described. The first coupling structure has a circular cylindrical element with a cylinder abutment surface, the circular cylindrical element projecting axially from a bottom surface of a central body and being arranged concentrically with respect to a central axis, A perpendicular abutment surface is arranged perpendicular to the central axis, and at least two ribs project axially from the bottom surface. Each rib has a contact area with a normal direction at least essentially perpendicular to the central axis for opposing a torque about the central axis.

A router bit for use with a turning implement comprising a router bit body having a shank body adjacent a cutting body for forming a key hole in a work piece. The shank body has an outer surface configured to be received by the turning implement. The cutting body has a body portion that spans between a tapered head portion and a tapered end portion, the tapered end portion attached to the shank body. The tapered head portion has a plunge cutting surface that forms a first acute angle with the longitudinal axis. The shank body has a diameter that is smaller than the diameter of the tapered head portion. The tapered end portion has a diameter that varies along its length from the shank body to the tapered head portion to reduce breakage of the router bit body during use. A wing may be attached to the cutting body.

A T-slot router bit for simultaneously cutting a T-slot groove into a work piece and withdrawing pieces of cut work piece from the T-slot groove in a single pass. The T-slot router bit includes a shank end, a boring end opposite to the shank end, a shank that extends from the shank end and is adapted to engage with a chuck of a router, a body that extends from the shank to the boring end and defines a T-shaped configuration, a pair of helical flutes of the body that extends between the shank and the boring end, and a pair of cutting edges that extends between the shank and the boring end.