Patent ID: 7530769

Claim:
A tool for metal cutting machining a surface in an opening, the tool comprising: a cutter tip having at least one geometrically defined cutting edge, the cuffing edge formed in a straight line between two adjacent corners of the cutter tip, wherein the cutter tip is a hexagonally shaped indexable tip and wherein an angle between each side of the cutter tip and an adjacent side is substantially the same for each side of the cutter tip; the cutter tip having a front side with at least one clamping notch having a V-shaped cross-section formed in the front side; two supporting regions in the tool for supporting the cutter tip, the supporting regions having support surfaces against which the cutter tip rests, and the support surfaces of the supporting region are oriented with respect to each other at an angle, the supporting regions also being so oriented that a line bisecting the angle between the support surfaces runs essentially perpendicular to an active one of the cutting edges, which is the edge that removes metal chips from the surface in the opening, wherein the cutter tip is turnable six times to make six cutting edges available for machining; a clamping claw which holds the cutter tip to the supporting regions, the clamping claw comprising a clamping lip; wherein the clamping lip comes to rest on a front side of the cutter tip and engages the clamping notch, and wherein the tool and cutter tip thereof are both shaped to be operable for metal cutting machining of valve seats in cylinder heads of internal combustion engines.