Abstract: A cutting tool cover set to a cutting tool which includes a hollow shaft body and at least one insert attached to an end face of the shaft body and cuts by bringing the insert into contact with a work while rotating the shaft body. The cutting tool cover includes: a body portion fixed to a top end portion of the shaft body; and an extension portion extended outward from the circumferential edge of the body portion in the entire circumference of the top end portion of the body portion to cover the surface of the work.

Abstract: A milling insert includes a polygonal tubular insert body which has: rake faces on one polygonal surface thereof, flanks composed of circumferential surfaces adjacent to the polygonal surface, and cutting edges defining a ridge line where the rake faces and flanks intersect each other as cutting edges. The rake faces have serrations where mount portions and valley portions are arrayed alternately to intersect the cutting edges. The ridge line has a waveform shape when the flanks are viewed from above. Bottom portions and top portions of the waveform are formed into concave circular arc portions and convex circular arc portions, respectively, and are alternately repeated. Both of the concave and convex circular arc portions are a ¼ circular arc or more to a ? circular arc or less. Each of the concave circular arc portions is unevenly located between the convex circular arc portions adjacent thereto.

Abstract: Disclosed is a milling insert, in which cutting resistance is reduced, wear advance of cutting edges is suppressed, and elongation of a lifetime is achieved, and is an indexable face milling cutter. When flanks 22 are viewed from the above, a cutting edge ridge line 23 is formed into a waveform shape, in which bottom portions are formed into concave circular arc portions 23b, top portions are formed into convex circular arc portions 23a, and the concave circular arc portions 23b and the convex circular arc portions 23a are alternately repeated, both of the concave circular arc portions and the convex circular arc portions are a ¼ circular arc or more to a ? circular arc or less, and each of the concave circular arc portions is unevenly located at a position close to one of two convex circular arc portions adjacent to the concave circular arc portion, and far from other of the two convex circular arc portions.

Abstract: A cutting tool cover set to a cutting tool which includes a hollow shaft body and at least one insert attached to an end face of the shaft body and cuts by bringing the insert into contact with a work while rotating the shaft body. The cutting tool cover includes: a body portion fixed to a top end portion of the shaft body; and an extension portion extended outward from the circumferential edge of the body portion in the entire circumference of the top end portion of the body portion to cover the surface of the work.