Patent ID: 8480337

Claim:
A drill for cutting a workpiece, the drill comprising: a drill body having a rotational axis; an inner insert mounted adjacent to the rotational axis at a proximal end of the drill body, the inner insert having a symmetry axis and an axis-symmetrical contour having four cutting edges and four rounded corners; and an outer insert being substantially identical to the inner insert, the outer insert being mounted further away from the rotational axis than the inner insert at the proximal end of the drill body, wherein, as mounted on the drill body, the inner insert and the outer insert each have a front cutting edge, wherein rotational loci of the inner insert and the outer insert at least partially overlap to form an overlapping region therewith, wherein at the overlapping region, the front cutting edge of the inner insert and the front cutting edge of the outer insert incline toward the rotational axis in a direction toward the workpiece, and wherein at the overlapping region, the rotational locus of the front cutting edge of the inner insert protrudes in a direction toward the workpiece along the rotational axis of the drill body compared to the rotational locus of the front cutting edge of the outer insert.