Abstract: The invention relates to a machining tool, especially a milling-cutter, in which each insert-holding cartridge (1) is fixed in a removable manner in a housing made in the body (2) of the tool. A blocking element accessible from the outside cooperates with the body of the tool and bears in service position against an inclined plane (6) of the back side of the cartridge, so as the pressure toward the bottom and forward according to the arrow F blocks the cartridge in its housing on three bearings respectively situated on the bottom (3), the back side (4) and the front side (5) of this housing. The cartridge further laterally bears against a fixed or adjustable stop.

Abstract: The cutting tool, for example a milling-cutter, with interchangeable insert-holding cartridges comprises a body (1) presenting a peripheral supporting face (4) directed towards the rear end of the body and recesses (2) distributed at its peripheral front end and intended to receive interchangeable cartridges (3). Each cartridge comprises at its front end a cutting bit (5), generally fixed in a removable manner, and a back portion (7) at its rear end presenting a supporting face (8) directed towards the front and intended to come, in a service position, in abutment against the supporting face (4) of the body. The fixing devices (9, 11) of the cartridges on the body of the tool are such that they enable an axial setting of the position of said cartridges, as well as the backward movement thereof for a temporary putting out of service.

Abstract: A hard metal cutting bit is useful both for rough cutting and for finishing, and comprises a polygonal member having parallel opposite main faces, and on at least one of the main faces a fillet that extends continuously about the edge of the main face, the fillet being concave and of greatest depth and width mid-way between the corners of the bit and of the least width and depth at the corners of the bit. A first chip breaker on the main face is next to the fillet and is of least width and depth mid-way between the corners and greatest depth and width adjacent the corners of the bit. A second chip breaker is next to the first and spaced by the first chip breaker from the fillet, and is discontinuous and concave and of greatest depth and width mid-way between the corners and terminates adjacent the corners.