Abstract: An edge-carrying drill body intended for deep hole drilling, is rotatable around a central geometric axis and comprises a through-channel arranged for internal chip evacuation. The channel mouths in front and rear ends of the drill body. A front channel mouth is bridged-over by a bridge on which a plurality of cutting edges are formed, which edges are made integrally with the rest of the bridge. The front mouth includes inlets disposed in front of respective cutting edges with reference to the direction of rotation of the body.

Abstract: A drill for chip removing machining, including a front tip including at least one cutting edge and a chip flute. The chip flute is countersunk in an envelope surface of a body of the drill and extends rearwardly from the cutting edge. The chip flute is generally defined by a cross-section-wise concavely vaulted surface located between first and second longitudinal borders, the first longitudinal border extending from an area of a peripheral end of the cutting edge. The chip flute is deeper in an area of the first longitudinal border than in an area of the second longitudinal border such that a curve defining the cross-sectional shape of the flute surface has a radius of curvature that is smallest in the vicinity of the first longitudinal border and that increases towards the second longitudinal border. The flute surface transforms into a planar chip surface, which in turn transforms into the cutting edge.

Abstract: A drill for chip removing machining, including a front tip including at least one cutting edge and a chip flute. The chip flute is countersunk in an envelope surface of a body of the drill and extends rearwardly from the cutting edge. The chip flute is generally defined by a cross-section-wise concavely vaulted surface located between first and second longitudinal borders, the first longitudinal border extending from an area of a peripheral end of the cutting edge. The chip flute is deeper in an area of the first longitudinal border than in an area of the second longitudinal border such that a curve defining the cross-sectional shape of the flute surface has a radius of curvature that is smallest in the vicinity of the first longitudinal border and that increases towards the second longitudinal border. The flute surface transforms into a planar chip surface, which in turn transforms into the cutting edge.

Abstract: An edge-carrying drill body intended for deep hole drilling, is rotatable around a central geometric axis and comprises a through-channel arranged for internal chip evacuation. The channel mouths in front and rear ends of the drill body. A front channel mouth is bridged-over by a bridge on which a plurality of cutting edges are formed, which edges are made integrally with the rest of the bridge. The front mouth includes inlets disposed in front of respective cutting edges with reference to the direction of rotation of the body.

Abstract: Rotatable tool for chip removing machining includes a rotatable holder part and a cutting part that is detachably connected to a front end of the holder part. In the front end of the holder part, a forwardly open slot is formed, which separates two elastically flexible branches of the holder part. For clamping of the cutting part on the holder part, a male/female coupling is provided, which comprises a pin on either the holder part or the cutting part and a corresponding pin-receiving seat in the other part. If the pin is on the holder part, then a manually induced elastic deformation of the branches towards one another reduces the diameter of the pin to enable the pin to enter the female part. Subsequent return of the branches toward a rest state thereof causes the diameter of the pin to expand and tightly hold the cutting part.

Abstract: A rotatable tool for chip removing machining having a rotatable holder part and a cutting part that is detachably connected to a front end of the holder part. In a front end portion of the holder part, a forwardly open slot is formed, which separates two elastically flexible branches of the holder part. For clamping of the cutting part on the holder part, a male/female coupling is arranged, which comprises a centrical, male-like pin on one of the parts and a corresponding seat in the other part. Disposed on the holder part radially outside of the male/female coupling are thrust load carrying support surfaces, which surfaces are at least partially conical and are engaged by corresponding support surfaces of the cutting part. During a cutting operation, axial thrust loads transmitted to the axial thrust support surfaces cause the branches to be pressed in a direction intensifying the radial contact between the pin and the seat.

Abstract: A deep hole drill for chip-removing drilling in a workpiece includes a body which has a cutting head and an integral cutting part. The body defines a longitudinal axis of rotation and has a longitudinal internal channel which opens into an end face of the cutting head for receiving cuttings that are entrained in a cooling medium. A chip removing insert is disposed on the cutting head. A support pad and a guide bar are disposed on a generally cylindrical outer peripheral surface of the cutting head and are arranged in circumferentially spaced relationship to one another. Cooling ducts are formed in the outer peripheral surface and are oriented generally parallel to the axis. The cooling ducts are open at the end face for conducting cooling medium thereto. The cooling ducts are situated adjacent the support pad and guide bar, respectively, for cooling same.

Abstract: An element which defines a support pad and/or a guide bar adapted to be mounted in a seat of a cutter head of a deep hole drill comprises a body which defines a longitudinal direction and a cross-direction. The body includes an inner mounting side and an opposing outer side. The outer side includes a contact surface which is adapted to engage a wall of a hole being drilled. The outer side also includes a countersink extending across the outer side in a direction transversely of the longitudinal direction. An edge of the contact surface facing toward a center of the body forms an angle with the longitudinal direction in the range of 55°±10°.

Abstract: Rotatable tool for chip removing machining includes a rotatable holder part and a cutting part that is detachably connected to a front end of the holder part. In the front end of the holder part, a forwardly open slot is formed, which separates two elastically flexible branches of the holder part. For clamping of the cutting part on the holder part, a male/female coupling is provided, which comprises a pin on either the holder part or the cutting part and a corresponding pin-receiving seat in the other part. If the pin is on the holder part, then a manually induced elastic deformation of the branches towards one another reduces the diameter of the pin to enable the pin to enter the female part. Subsequent return of the branches toward a rest state thereof causes the diameter of the pin to expand and tightly hold the cutting part.

Abstract: A rotatable tool for chip removing machining having a rotatable holder part and a cutting part that is detachably connected to a front end of the holder part. In a front end portion of the holder part, a forwardly open slot is formed, which separates two elastically flexible branches of the holder part. For clamping of the cutting part on the holder part, a male/female coupling is arranged, which comprises a centrical, male-like pin on one of the parts and a corresponding seat in the other part. Disposed on the holder part radially outside of the male/female coupling are thrust load carrying support surfaces, which surfaces are at least partially conical and are engaged by corresponding support surfaces of the cutting part. During a cutting operation, axial thrust loads transmitted to the axial thrust support surfaces cause the branches to be pressed in a direction intensifying the radial contact between the pin and the seat.

Abstract: A drill includes a shank having a tip with two cutting inserts located in a main plane. The cutting inserts have short central cutting edges oriented in a secondary plane. The edges form a pointed center cutting edge for the purpose of entering a workpiece and thereby centering the drill. In the shank two helical flutes are provided, the flutes extending from the tip to the base end. The flutes are located diametrically opposite each other and are separated by two helical lands. The flutes lie in a flute plane that extends at an angle of 90.degree. to the land plane. The secondary plane forms an angle of about 90.degree. to the orientation of the land plane when viewed at the base end of the shank.

Abstract: The present invention relates to a drill comprising a shaft with chip-conveying flutes and a drill head with two or more cutting elements. Each of the cutting elements comprises a cutting edge which is delimited between a chip-breaking surface and a relief surface and which, at least in the proximity of the geometrical center or rotational axis of the drill, comprises a curved portion. The cutting edge of the individual cutting elements is located with its curved portion in such a way that a tangential point on a straight line that extends from the central axis and tangentially touches said curved edge portion, is provided distantly from the central axis of the drill. In the immediate proximity of this central axis, the cutting edge is terminated in a small material portion which is common for all cutting edges and which extends between the cutting elements in order to serve for centering the drill.

Abstract: A drill comprising a solid shank with a first, tip-forming end having cutting edges on opposite second end and a number of flutes corresponding to the number of cutting edges. The flutes extend from the tip end towards the other end and have the purpose of forming and conveying chips from the corresponding cutting edge. At a predetermined distance from the tip, each individual flute turns from a first, chip-forming zone with a predetermined width or cross-sectional area into a second, merely chip-conveying zone with a larger width or cross-sectional area. After having been formed in the first zone, the chips are given the possibility of dilating in the second zone, in order to facilitate chip conveyance.