A body of a cutting tool may include a shank and a tip having spaced-apart, helical flutes. Each spaced-apart, helical flute may include a helical cutting edge extending from a tip bottom, adjacent a shank top, to a tip top. The tip may include chip gash paths. Each chip gash path may be recessed between two of the spaced-apart, helical flutes, and extend from the tip bottom to a tip top portion. The body may include helical coolant channels extending from entrances at a shank bottom, to within a shank interior, to within a tip interior, to tip coolant orifice exits. The coolant orifice exits may be disposed in the spaced-apart, helical flutes adjacent the chip gash paths or disposed in relief surfaces extending from the tip top downward to the chip gash paths. The coolant orifice exits may be spaced-apart from the tip top.

A method for manufacturing a rotatable tool body with pockets positioned circumferentially between flutes about a cylindrical body to accept removable cutting inserts and to distribute the circular runout in a fashion among all of the insert pockets to minimize impact on any particular insert and to increase tolerances. A rotatable tool body also includes these features and a method for utilizing such a rotatable tool body is disclosed.

A method for manufacturing a rotatable tool body with pockets positioned circumferentially between flutes about a cylindrical body to accept removable cutting inserts and to distribute the circular runout in a fashion among all of the insert pockets to minimize impact on any particular insert and to increase tolerances. A rotatable tool body also includes these features and a method for utilizing such a rotatable tool body is disclosed.

A method for making a cutting tool for machining titanium alloy or superalloy, including introducing pure N.sub.2 and Ar into a chamber comprising a heater and a substrate, keeping a temperature of the heater constant, applying a back bias voltage on the substrate, and forming a Me-BN coating on the substrate by magnetron sputtering technology. The flow ratio of pure N.sub.2 to Ar is 0.06-0.25; the pressure in the chamber is 0.4-4 pascal; and the temperature of the heater in the chamber is in a range of 300-600 C. A Me-B target is adopted, and a planet carrier supporting the substrate is connected to a negative pole of a power supply. The rotating speed of the planet carrier is 3 rpm, the back bias voltage is 50 to 300 V, and the time for coating is 60-300 min.

A method and a device for machining an elongated workpiece having a shaft extending in the direction of the workpiece longitudinal axis forms at least one groove with a defined groove surface on the workpiece by material removal by a laser beam directed with its beam axis onto the workpiece surface and guided along a laser path extending exclusively parallel to a groove profile curve corresponding to the intersection between the groove surface to be produced and a geometric plane that forms an angle with the workpiece longitudinal axis, where 90the angle of groove inclination. The distance between the curve and the path is predetermined such that the workpiece material located in the geometric plane on the path side facing away from the curve completely sublimates or vaporizes due to the laser beam power density when the beam is guided along the path.

A method and a device for machining an elongated workpiece having a shaft extending in the direction of the workpiece longitudinal axis forms at least one groove with a defined groove surface on the workpiece by material removal by a laser beam directed with its beam axis onto the workpiece surface and guided along a laser path extending exclusively parallel to a groove profile curve corresponding to the intersection between the groove surface to be produced and a geometric plane that forms an angle with the workpiece longitudinal axis, where 90the angle of groove inclination. The distance between the curve and the path is predetermined such that the workpiece material located in the geometric plane on the path side facing away from the curve completely sublimates or vaporizes due to the laser beam power density when the beam is guided along the path.

An end mill includes: at a distal end portion side in a rotation axis direction of a tool body, a plurality of cutting edges continuous from a center side to an outer peripheral side in a radial direction and adjacently arranged in a rotation direction of the tool body; gashes formed on front sides in a rotation direction of the respective cutting edges; and chip discharge flutes continuous with the gashes. The gashes are composed of distal end side depressed faces formed along a distal end side axis making an acute angle with the rotation axis and rear side depressed faces formed along a rear side axis making a smaller acute angle with the rotation axis than the distal end side axis. The distal end side depressed faces and the rear side depressed faces are formed to have shapes overlapping with one another.

An end mill includes: at a distal end portion side in a rotation axis direction of a tool body, a plurality of cutting edges continuous from a center side to an outer peripheral side in a radial direction and adjacently arranged in a rotation direction of the tool body; gashes formed on front sides in a rotation direction of the respective cutting edges; and chip discharge flutes continuous with the gashes. The gashes are composed of distal end side depressed faces formed along a distal end side axis making an acute angle with the rotation axis and rear side depressed faces formed along a rear side axis making a smaller acute angle with the rotation axis than the distal end side axis. The distal end side depressed faces and the rear side depressed faces are formed to have shapes overlapping with one another.

A method of forming a rotary cutter includes forming at least one longitudinally-extending flute along a body of a rotary blank, and forming a plurality of pockets along the at least one longitudinally-extending flute. A plurality of polycrystalline diamond (PCD) segments are attached to the body, wherein each PCD segment of the plurality of PCD segments is attached to a respective pocket of the plurality of pockets. A cutting edge is formed along a leading edge of each of the PCD segments.

A method of forming a rotary cutter includes forming at least one longitudinally-extending flute along a body of a rotary blank, and forming a plurality of pockets along the at least one longitudinally-extending flute. A plurality of polycrystalline diamond (PCD) segments are attached to the body, wherein each PCD segment of the plurality of PCD segments is attached to a respective pocket of the plurality of pockets. A cutting edge is formed along a leading edge of each of the PCD segments.