Abstract: A drilling tool includes a drill body having chip channel formed therein and carrying cutting inserts at front ends of respective chip channels. Disposed in the chip channels at a location spaced from the cutting insert are respective damping elements. Each damping element comprises first and second portions formed of respective materials of different rigidity.

Abstract: The invention relates to a drilling tool for hole-drilling in metallic materials, including a drill body (11) as well as at least one cutting insert (12) located in the front end thereof, defining the periphery of the drill, the drill body having a number of axially extending chip channels (14, 15) and bars (16, 17) situated therebetween. Characteristic of the new tool is that the drill body (11) has been provided with a damping unit (18) situated at an axial distance behind the cutting inserts in at least one chip channel which damping unit entirely or partly fills up a portion of said chip channel, and which damping unit is composed of two material portions (18a, 18b, 23a, 23b) made up of different rigidities.

Abstract: A spiral drill includes a rear shank portion; a front tip; and a spiral (helical) middle portion extending therebetween. Spiral ribs are formed in the middle portion, and coolant channels extend through the drill to the tip for conducting coolant fluid. The coolant channels form exit openings in the tip which are spaced at different radial distances from a centerline of the drill. Each coolant channel extends spirally through a respective rib, and the portion of each coolant channel disposed in the shank is straight. Those straight portions are spaced by different radial distances from the centerline.

Abstract: A spiral drill includes a rear shank portion; a front tip; and a spiral (helical) middle portion extending therebetween. Spiral ribs are formed in the middle portion, and coolant channels extend through the drill to the tip for conducting coolant fluid. The coolant channels form exit openings in the tip which are spaced at different radial distances from a centerline of the drill. Each coolant channel extends spirally through a respective rib, and the portion of each coolant channel disposed in the shank is straight. Those straight portions are spaced by different radial distances from the centerline.

Abstract: A spiral drill and a method to manufacture a spiral drill with two indexable inserts at different distances from the center line and two coolant channels, where the coolant channels (23,24) run parallel to the center line within the shank part, and where the spiral part has been twisted while heated to form spirally curved coolant channels (17,18), and where exit channels at the tip have been drilled after twisting, and where the exit openings (21,2) are located at different distances from the center line.

Abstract: A drill for drilling in metal with improved performance in the smaller diameter range. The drill comprises a drill shaft, the front end of which is provided with radially outer and radially inner inserts, each insert having elongated rhomboidic shape, in which each of the short sides is broken at its middle to form a V-shape having an internal obtuse angle. The inserts are arranged such that the longitudinal axis of the radially outer insert is inclined at an angle from the longitudinal axis that is different from the angle of inclination between the longitudinal axis of the radially inner insert and the longitudinal axis of the drill.

Abstract: Spiral drill comprising a cylindrical part with two chip grooves (15,16) and a principal maximum stiffness direction (22,23), an attachment part (30) with larger diameter connecting to the cylindrical part at a transition (14), and a tip with indexable cutting inserts (12,13), the chip grooves spirally encircling the cylindrical part to make the principal direction turn an angle C which is at least 110 degrees and at most 125 degrees.

Abstract: A drill with indexable inserts has one center insert (11) and one peripheral insert (12), said center insert having a symmetric drill point (25) on the drill axis (10) with a transverse edge which is continuous with one short edge (27) and one long edge (21,23) and a screw hole offset from the symmetry axis of the drill point (25) towards the side of the long edge (21,23).