Large diameter edges formed in arc shapes having curvature radii larger than a ball radius are provided. This allows improving surface roughness of a machined surface by cutting of a planar surface with the respective large diameter edges compared with cutting of a planar surface with a ball end cutting edge formed in an arc shape having a single curvature radius. Further, since the respective large diameter edges are formed in the arc shape, compared with cutting of a curved surface with linear cutting edges, surface roughness of a machined surface can be improved by cutting a curved surface with the respective large diameter edges. Accordingly, a pick feed during the cutting of the planar surface and the curved surface with the respective large diameter edges can be increased, and therefore machining efficiency in the cutting of both of the planar surface and the curved surface can be improved.

This cutting insert has: as cutting edges, arcuate cutting edges that are of an arc shape protruding toward an outer circumference side of a distal end. A chisel part is formed at an intersecting ridge line part between the flank faces of the pair of arcuate cutting edges. A round honing is formed on the cutting edge tip of the arcuate cutting edge at least in a range where a radial angle is 30 or less. A curvature radius of the round honing in a cross section perpendicular to the edge length direction of the arcuate cutting edge is 20 to 40 m. A chisel angle formed between the distal end part of the arcuate cutting edge and a chisel edge of the chisel part is 150 to 170 as seen in an insert front view.

A ball nose end mill insert includes an insert body having an axial center axis, two opposed substantially flat insert side surfaces, and a peripheral surface joining the two insert side surfaces. The peripheral surface includes two arcuate surfaces at a first axially forward end of the insert and an insert support surface at a second axially rearward end of the insert. The arcuate surfaces extend axially rearward from an axial center area of the first axially forward end and are positioned symmetrically on opposite sides in relation to the axial center area. Peripheral side surfaces adjoin the arcuate surfaces. An insert through hole intersects the insert side surfaces. The insert support surface has an axial insert support surface having surface portions on opposite sides of the axial center axis and a radial insert support surface. The axial and the radial insert support surfaces together form an acute angle.

A method for assembling cable wrapping tapes. From an adhesive tape parent roll, strip-like adhesive tapes (11), each having two cut edges (12a) on the sides, are produced from a textile material which has an adhesive coating (12) on one side, by cutting in the drawing direction of the parent roll. The cutting is performed using an ultrasound-excited cutting tool (1) and wherein the cutting is performed using a cooled cutting tool (1). An adhesive tape (11), having a strip-like textile carrier material (13) and an adhesive coating (12) applied to one side and two cut edges (12a) on the sides. The cut edges (12a) are created by ultrasound cutting, and the textile carrier material (13) of the carrier is fused to its cut edges (12a). No adhesive coating (12) exists on the cut edges (12a); which are free of lint and threads.

This cutting insert has: as cutting edges, arcuate cutting edges that are of an arc shape protruding toward an outer circumference side of a distal end. A chisel part is formed at an intersecting ridge line part between the flank faces of the pair of arcuate cutting edges. A round honing is formed on the cutting edge tip of the arcuate cutting edge at least in a range where a radial angle is 30 or less. A curvature radius of the round honing in a cross section perpendicular to the edge length direction of the arcuate cutting edge is 20 to 40 m. A chisel angle formed between the distal end part of the arcuate cutting edge and a chisel edge of the chisel part is 150 to 170 as seen in an insert front view.

A cutting insert includes a rake face, a flank surface, and a cutting edge, the cutting edge includes a bottom cutting edge that is positioned at a front end in a central axis direction and forms a convex arc shape and an outer peripheral cutting edge aligned with a radial-direction outer end of the bottom cutting edge and forms a convex arc shape of which a curvature radius is larger than that of the bottom cutting edge, an angle formed between a tangent line to a boundary point between the bottom cutting edge and the outer peripheral cutting edge and the central axis is less than 45, a curvature radius R1 of the bottom cutting edge is 0.3 to 10 mm, and a ratio (R2/R1) of a curvature radius R2 of the outer peripheral cutting edge to the curvature radius R1 of the bottom cutting edge is 3.6 to 333.

A cutting insert includes a rake face, a flank surface, and a cutting edge, the cutting edge includes a bottom cutting edge that is positioned at a front end in a central axis direction and forms a convex arc shape and an outer peripheral cutting edge aligned with a radial-direction outer end of the bottom cutting edge and forms a convex arc shape of which a curvature radius is larger than that of the bottom cutting edge, an angle formed between a tangent line to a boundary point between the bottom cutting edge and the outer peripheral cutting edge and the central axis is less than 45, a curvature radius R1 of the bottom cutting edge is 0.3 to 10 mm, and a ratio (R2/R1) of a curvature radius R2 of the outer peripheral cutting edge to the curvature radius R1 of the bottom cutting edge is 3.6 to 333.

Large diameter edges formed in arc shapes having curvature radii larger than a ball radius are provided. This allows improving surface roughness of a machined surface by cutting of a planar surface with the respective large diameter edges compared with cutting of a planar surface with a ball end cutting edge formed in an arc shape having a single curvature radius. Further, since the respective large diameter edges are formed in the arc shape, compared with cutting of a curved surface with linear cutting edges, surface roughness of a machined surface can be improved by cutting a curved surface with the respective large diameter edges. Accordingly, a pick feed during the cutting of the planar surface and the curved surface with the respective large diameter edges can be increased, and therefore machining efficiency in the cutting of both of the planar surface and the curved surface can be improved.

A method for assembling cable wrapping tapes. From an adhesive tape parent roll, strip-like adhesive tapes (11), each having two cut edges (12a) on the sides, are produced from a textile material which has an adhesive coating (12) on one side, by cutting in the drawing direction of the parent roll. The cutting is performed using an ultrasound-excited cutting tool (1) and wherein the cutting is performed using a cooled cutting tool (1). An adhesive tape (11), having a strip-like textile carrier material (13) and an adhesive coating (12) applied to one side and two cut edges (12a) on the sides. The cut edges (12a) are created by ultrasound cutting, and the textile carrier material (13) of the carrier is fused to its cut edges (12a). No adhesive coating (12) exists on the cut edges (12a); which are free of lint and threads.

A ball-end mill includes arcuate cutting edges each extending from a tip end to a peripherally outermost point along a S shape curve when viewed from the front side, spirally-shaped, peripheral cutting edges each smoothly connected to each arcuate cutting edge, and a convex rake face of each arcuate cutting edge protruding forward in a rotation direction. Each arcuate cutting edge has a radial rake angle satisfying <, where is a radial rake angle at a radial angle of 5, is a radial rake angle at a radial angle of 90, and is a radial rake angle at a rotationally most projecting point of the arcuate cutting edge. The radial rake angle has the maximum value at a radial angle in a range of 12-40 and continuously decreases in a range from the rotationally most projecting point to the peripherally outermost point.