End mill cutter having a plurality of cutting edges distributed over the circumference of the mill cutter, having a flank which is adjacent to the respective cutting edge in the circumferential direction and a supporting surface which adjoins the flank on that side which faces away from the cutting edge in the circumferential direction.

An end mill includes a body including an axis, first cutting edges on a side of a front end of the body, second cutting edges at a rear side of the respective first cutting edges, flutes located along the second cutting edges, and heels located along the flutes. A shape of each of the flutes in a cross section includes a first concave curve on a side of the second cutting edges, a second concave curve on a side of the heels, and a protrusion located between the two concave curves, the protrusion includes two concave curves intersect each other, and a ratio of a distance from a circle including a maximum diameter in the body centered on the axis to a top of the protrusion to a distance H from the circle to the second cutting edge is 0.1 to 0.4.

A cutting tool includes a main body. The main body includes a distal end surface, a rear end surface, and a side surface. A spiral first groove and a spiral second groove are formed on the side surface of the main body. The first groove has at least four installation surfaces. The first installation surface is located on a most rear end surface side. The second installation surface is located closer to a distal end surface side with respect to the first installation surface. A length from the first installation surface to the second groove in a circumferential direction along the rotation direction of the main body is set to a first length. A length from the second installation surface to the second groove in the circumferential direction is set to a second length. The first length is longer than the second length.

The invention relates to a milling tool having a plurality of first blades and at least one second blade, which are arranged on the milling tool in a staggered manner in the circumferential direction of the milling tool, wherein the plurality of first blades are arranged in the axial direction of the milling too at a nominal position, wherein the plurality of first blades comprises a compensation group having at least one compensation blade and at least one non-compensation blade, wherein the at least one non-compensation blade is assigned a nominal cutting circle, wherein the at least one compensation blade is assigned a compensation cutting circle, wherein the nominal cutting circle and the compensation cutting circle are different, wherein the at least one second blade is offset forward in the axial direction of the milling tool by a forward offset with respect to the nominal position in the direction of a machining front end, wherein the at least one second blade is assigned a surface machining cutting circle, wherein the surface machining cutting circle is smaller than the nominal cutting circle and than the compensation cutting circle, wherein the at least one second blade leads the plurality of first blades in the circumferential direction.

A milling tool having a front end, a rear end, a longitudinal axis extending therebetween, a shank portion and a cutting portion. The cutting portion includes a plurality of teeth separated by a corresponding number of flutes. Each tooth extends axially along the cutting portion following a curved helical path around the longitudinal axis, and extends at a first helix angle from the front end to a helix transition, and at a second helix angle from the helix transition towards the shank portion. The second helix angle is greater than the first helix angle by at least 2 and at most 15. The first helix angle () is 3350, and the second helix angle () is 4055, and wherein the helix transition is axially located from the front end by 0.2 to 0.7 of the longitudinal length of the cutting portion.