A thread milling cutter having a main body which includes a shank and a cutting portion, which is cylindrical in its basic shape, an axis of rotation and a plurality of cutting teeth, which are spaced in the peripheral direction and which are arranged on the cutting portion in at least two different radial planes extending perpendicularly to the axis of rotation is provided. The thread milling cutter combines the advantages of high working efficiency of one-piece thread milling cutters having a plurality of cutting teeth and cutting lobes with the advantages of thread milling cutters having indexable cutting inserts without being restricted to large diameters. The cutting portion, respectively, has at least two seats for receiving a respective standard cutting insert in each of at least two different radial planes and the cutting teeth are formed by cutting corners of standard cutting inserts.

A thread milling cutter having a main body which includes a shank and a cutting portion, which is cylindrical in its basic shape, an axis of rotation and a plurality of cutting teeth, which are spaced in the peripheral direction and which are arranged on the cutting portion in at least two different radial planes extending perpendicularly to the axis of rotation is provided. The thread milling cutter combines the advantages of high working efficiency of one-piece thread milling cutters having a plurality of cutting teeth and cutting lobes with the advantages of thread milling cutters having indexable cutting inserts without being restricted to large diameters. The cutting portion, respectively, has at least two seats for receiving a respective standard cutting insert in each of at least two different radial planes and the cutting teeth are formed by cutting corners of standard cutting inserts.

A thread milling cutter (1) includes an integrally formed thread milling tool (10) having a rotational axis (S), a shank portion (24) and a forward cutting portion (34). The cutting portion (34) has at least five insert pockets (42) recessed therein with at least one insert pocket (42) being devoid of an associated support protrusion (46), allowing different insert placements for different thread pitches.

A thread milling cutter (1) includes an integrally formed thread milling tool (10) having a rotational axis (S), a shank portion (24) and a forward cutting portion (34). The cutting portion (34) has at least five insert pockets (42) recessed therein with at least one insert pocket (42) being devoid of an associated support protrusion (46), allowing different insert placements for different thread pitches.

A thread milling tool extends along an axis of rotation and contains a thread milling section and a drill tip adjoining the thread milling section. The thread milling section has three cutting flutes and at least one thread milling tooth, while the drill tip has three main cutting edges, each of which reaches a main cutting circle when viewed in parallel to the axis of rotation. The main cutting circle defines a drilling diameter that can be produced by the drill tip. Each main cutting edge has a main cutting surface that is connected to one cutting flute of the cutting flutes and reaches the main cutting circle at a respective radial main cutting angle when viewed in parallel to the axis of rotation, and at least one radial main cutting angle of the radial main cutting angles is positive.

Opposing undercut surfaces may be formed on a helical thread disposed about a shaft of a fastener by: rotating the shaft; translating a first cutting head medially toward the shaft along a first oblique trajectory of a first oblique cutting surface of the first cutting head; translating the first cutting head along a length of the shaft to form at least one of the opposing undercut surfaces on the helical thread; translating a second cutting head medially toward the shaft along a second oblique trajectory of a second oblique cutting surface of the second cutting head; and translating the second cutting head along a length of the shaft to form at least another one of the opposing undercut surfaces on the helical thread.

Opposing undercut surfaces may be formed on a helical thread disposed about a shaft of a fastener by: rotating the shaft; translating a first cutting head medially toward the shaft along a first oblique trajectory of a first oblique cutting surface of the first cutting head; translating the first cutting head along a length of the shaft to form at least one of the opposing undercut surfaces on the helical thread; translating a second cutting head medially toward the shaft along a second oblique trajectory of a second oblique cutting surface of the second cutting head; and translating the second cutting head along a length of the shaft to form at least another one of the opposing undercut surfaces on the helical thread.

A whirling tool (21), in particular for cutting a thread, includes a body with cutting teeth integrally machined thereon (23; 47, 51). Inaccuracies caused by mounting cutting teeth on the tool are avoided thereby.

A whirling tool (21), in particular for cutting a thread, includes a body with cutting teeth integrally machined thereon (23; 47, 51). Inaccuracies caused by mounting cutting teeth on the tool are avoided thereby.

Provided is a thread mill that can reduce tilting of an internal thread to be machined, thus increasing the tool life. A thread mill includes a plurality of thread cutting edges that are circumferentially spaced apart on a front end side of an outer circumference of a tool body, and a plurality of end cutting edges formed at the front end of the tool body. A functional cutting edge portion that cuts a workpiece, and a non-functional cutting edge portion that is relieved toward an axial shank end relative to a trajectory of the functional cutting edge portion when the tool body is caused to make one rotation about an axis are formed on the plurality of end cutting edges.