Patent ID: 7753627

Claim:
A single-lip drill comprising: a drill head; a bit integrally formed on the drill head and defining a cutting wedge; and at least one cutting edge provided on the cutting wedge for machining by cutting of a workpiece, wherein the cutting edge is associated at least one chip former for shaping the chips cut off by the cutting edge; wherein the chip former comprises a slot having a substantially U-shaped cross-section and has a positive rake angle (γ) between the tool face and an imaginary line perpendicular to a machining face of the workpiece to be cut; wherein the chip former has a chip guide face extending from the cutting edge towards a bottom of the chip former and a chip break section following the chip guide face, commencing at a distance from the cutting edge, and extending to a boundary surface with respect to a corrugation for removing a coolant-chip mixture; and wherein the chip guide face comprises a sloping surface with a constant tangent angle, which sloping surface is followed by a curved chip breaking section.