Abstract: A tangential indexable cutting insert having eight lips which are distributed in pairs over four side faces of the indexable cutting insert, each lip being formed by a main lip which is formed by the intersection of one of the side faces with a base face, a secondary lip, which is formed by the intersection of the side face with an adjacent side face, and a corner edge (5) adjoining the main lip and the secondary lip, is distinguished by the fact that the main lip has a front portion (4a) which is located at the level of the corner edge, a rear portion which is located at a lower level closer to a center axis of the indexable cutting insert, and a transition portion between the front portion and the rear portion, the three portions being located in one plane.

Abstract: A tangential indexable cutting insert having eight lips which are distributed in pairs over four side faces of the indexable cutting insert, each lip being formed by a main lip which is formed by the intersection of one of the side faces with a base face, a secondary lip, which is formed by the intersection of the side face with an adjacent side face, and a corner edge (5) adjoining the main lip and the secondary lip, is distinguished by the fact that the main lip has a front portion (4a) which is located at the level of the corner edge, a rear portion which is located at a lower level closer to a center axis of the indexable cutting insert, and a transition portion between the front portion and the rear portion, the three portions being located in one plane.

Abstract: The invention relates to an eight-edged rotatable and reversible cutting insert having two opposite, substantially square base surfaces which are twisted relative to one another about a central axis running perpendicularly to said base surfaces, and having four identical side surfaces. A main lip is formed between each base surface and each side surface and extends only over part of the length of the side surface. Each side surface has two diagonally opposite corner edges which are of circular or curved design and form a secondary lip adjacent to the respective main lip. In addition, each side surface has two chip pockets which are drawn into the side surface and which, starting from the respective corner edge, extend along the main lip assigned to said corner edge up to a rear chip pocket end.

Abstract: The invention relates to an eight-edged rotatable and reversible cutting insert having two opposite, substantially square base surfaces which are twisted relative to one another about a central axis running perpendicularly to said base surfaces, and having four identical side surfaces, wherein a main lip is formed between each base surface and each side surface. A bearing surface is formed between two chip grooves which extend along the associated main lip of the respective side surface, said bearing surface extending symmetrically beyond the groove ends of the adjacent chip groove and transversely to the main lips until its adjoins the latter.

Abstract: The invention relates to an eight-edged rotatable and reversible cutting insert having two opposite, substantially square base surfaces which are twisted relative to one another about a central axis running perpendicularly to said base surfaces, and having four identical side surfaces. A main lip is formed between each base surface and each side surface and extends only over part of the length of the side surface. Each side surface has two diagonally opposite corner edges which are of circular or curved design and form a secondary lip adjacent to the respective main lip. In addition, each side surface has two chip pockets which are drawn into the side surface and which, starting from the respective corner edge, extend along the main lip assigned to said corner edge up to a rear chip pocket end.

Abstract: The invention relates to an eight-edged rotatable and reversible cutting insert having two opposite, substantially square base surfaces which are twisted relative to one another about a central axis running perpendicularly to said base surfaces, and having four identical side surfaces, wherein a main lip is formed between each base surface and each side surface. A bearing surface is formed between two chip grooves which extend along the associated main lip of the respective side surface, said bearing surface extending symmetrically beyond the groove ends of the adjacent chip groove and transversely to the main lips until its adjoins the latter.

Abstract: The invention relates to a cutter insert comprising cutting edges (3, 6) and at least one cutting cavity (4) which is recessed in the cutting surface (1). The surface and the contour shape of the cutting cavity (4) are configured such that they are similar to the surface and to the contour shape of an asymmetrically oval shell. The cross-sectional profile of the cutting cavity surface comprises, in the directions of the principal axis (8) and the minor axis (10) of the oval shape, a less sharp or sharper curvature on the sides thereof facing the cutting tip (2) and the cutting edge (3, 6) than that on the sides thereof facing away from the cutting tip (2) and the cutting edge (3, 6).

Abstract: The invention relates to a cutter insert comprising cutting edges (3, 6) and at least one cutting cavity (4) which is recessed in the cutting surface (1). The surface and the contour shape of the cutting cavity (4) are configured such that they are similar to the surface and to the contour shape of an asymmetrically oval shell. The cross-sectional profile of the cutting cavity surface comprises, in the directions of the principal axis (8) and the minor axis (10) of the oval shape, a less sharp or sharper curvature on the sides thereof facing the cutting tip (2) and the cutting edge (3, 6) than that on the sides thereof facing away from the cutting tip (2) and the cutting edge (3, 6).

Abstract: A screwing plate or thread cutting bit comprising at least one cutting tip whose contour matches the desired shape of the threading. The cutting tip is configured as a chip forming element which is shaped in the form of a spur located between both sides of the cutting faces. The chip forming element rises above the cutting faces more or less in the form of a table mountain. The flanks of the spur, which are slanted in the form of inclined walls, are spaced at different distances from the adjacent cutting edges so as to form cutting faces with differing widths.

Abstract: CLAIM The ornamental design for a cutting tool insert, as shown and described. DESCRIPTION FIG. 1 is an isometric view of a cutting tool insert in accordance with a first embodiment of the subject invention; FIG. 2 is a top plan view of FIG. 1, wherein the bottom plan view is identical; FIG. 3 is a side elevation view from any side of the cutting tool insert in FIG. 2; FIG. 4 is a cross-sectional view taken along lines “4—4” in FIG. 1; FIG. 5 is an isometric view of a cutting tool insert in accordance with the second embodiment of the subject invention; FIG. 6 is a top plan view of FIG. 5, wherein the bottom plan view is identical; FIG. 7 is a side elevation view from any side of the cutting tool insert in FIG. 5; FIG. 8 is a cross-section view taken along lines “8—8” in FIG. 5; FIG. 9 is an isometric view of a cutting tool insert in accordance with a third embodiment of the subject invention; FIG. 10 is a top plan view of FIG.