Abstract: The short flank face includes a second flank face that is adjacent to the short cutting edge rearward of a rotation axis in a rotation direction and is flat and a third flank face that is adjacent to the second flank face rearward of the rotation axis in the rotation direction and is flat. In front view of the body from the front end, a maximum value of a width of the second flank face in the direction orthogonal to the short cutting edge is smaller than a maximum value of a width of the long flank face in the direction orthogonal to the long cutting edge, and a clearance angle of the second flank face is smaller than a clearance angle of the long flank face.

Abstract: A rotary tool includes a coolant hole opening in a flank face. The coolant hole includes, in a cross section orthogonal to a rotational axis of the rotary tool, a first portion protruding toward a front in a rotation direction of the rotational axis and toward an outer peripheral side and having a convex curved shape, a second portion protruding toward the front in the rotation direction and toward a central side having a convex curved shape, and a third portion protruding toward a rear in the rotation direction and toward the central side and having a convex curved shape.

Abstract: A cutting insert may include a base, a cutting edge and a flute. The base may include a rotation axis and may be extended from a first end to a second end. The cutting edge may be located on a side of the first end. The flute may be extended from the cutting edge toward the second end. The cutting edge may include a first cutting edge and a second cutting edge. The first cutting edge may intersect with the rotation axis in a front view. The second cutting edge may be located closer to an outer periphery than the first cutting edge, and a rake angle of the second cutting edge may have a positive value. The first cutting edge may be formed by round honing, and the second cutting edge may be formed by chamfer honing.

Abstract: A cutting tool may include a body, a cutting edge, and a flute. The body may include a rotation axis and extend from a first end to a second end. The cutting edge may be located at the first end. The flute spirally may extend from the cutting edge toward a side of the second end. The cutting edge may include a first cutting edge and a second cutting edge extending from the first cutting edge toward an outer peripheral surface of the body in a front view. The flute may include a first thinning portion located continuously with the first cutting edge at a side of the first end, and a second thinning portion located continuously with the second cutting edge at a side of the first end. A thinning angle of the first thinning portion may be smaller than a thinning angle of the second thinning portion.

Abstract: A cutting tool may include a body, a cutting edge, and a flute. The body may include a rotation axis and extend from a first end to a second end. The cutting edge may be located at the first end. The flute spirally may extend from the cutting edge toward a side of the second end. The cutting edge may include a first cutting edge and a second cutting edge extending from the first cutting edge toward an outer peripheral surface of the body in a front view. The flute may include a first thinning portion located continuously with the first cutting edge at a side of the first end, and a second thinning portion located continuously with the second cutting edge at a side of the first end. A thinning angle of the first thinning portion may be smaller than a thinning angle of the second thinning portion.