Abstract: A mine tool roof bit insert has two flat parallel sides extending in the long dimension of the insert and has two uppermost slanted surfaces extending between the two flat parallel sides. There is a trough at the top of the insert, which is between the two uppermost slanted surfaces and which is substantially orthogonal to the two flat parallel sides.

Abstract: A fully dense ceramic-metal body including about 40-68 v/o .alpha.-alumina; about 10-30 v/o of a granular, hard refractory carbide, nitride, or boride; about 20-40 v/o silicon carbide platelets or elongated grains; and about 2-10 v/o of a dispersed metal phase combining Ni and Al mostly segregated at triple points of the microstructure. The preferred metal phase contains a substantial amount of the Ni.sub.3 Al ordered crystal structure. In the preferred body, the reinforcing SiC phase is partially incorporated into the alumina grain, and bridges the grain boundaries. The body including a segregated metal phase is produced by densifying a mixture of the hard phase components and the metal component, with the metal component being present in the mixture as Ni powder and Al powder. The body may be used as a cutting tool for machining nickel superalloys or cast iron at speeds up to about 1000 sfm, feed rates up to about 0.012 in/rev, and depth of cut up to about 0.10 inches.

Abstract: The forward surface of a bit mount against which the shoulder of a cutting bit can rotatably bear has carbide inserts brazed therein to reduce wear of the forward surface. In the manufacture thereof, there are insert holes in the forward surface into which the carbide inserts are inserted. There are smaller holes next to the insert holes, and overlapping therewith, into which braze slugs are inserted. There is an interference fit between the carbide inserts and the braze slugs, which aids in retaining the carbide inserts in the insert holes during the brazing operation.

Abstract: An ultra light duty polygonal lay down indexable insert having a scalloped shaped island symmetrically disposed on the top or bottom surface of the insert.

Abstract: Composite materials, articles and cutting tools are prepared by densification to form a body comprising whiskers of hard refractory transition metal carbides, nitrides or carbonitrides uniformly distributed in a two-phase silicon nitride matrix. A first phase comprises silicon nitride grains and the second phase is an intergranular phase formed from one or more suitable densification aids. Optionally, dispersoid particles and/or polycrystalline fibers may also be incorporated. The preferred composite article or cutting tool has a fracture toughness equal to or greater than about 3.5 MPa.m.sup.1/2.

Abstract: A connection system for connecting an interchangeable tool head to the spindle of a numerically controlled machine includes radially displaceable wedge members which when actuated radially to an outer clamping position provide for a clamping connection between the spindle and the tool head. When actuated to an inner release position the system allows for withdrawal of the tool head from the spindle. The wedge members are displaced by a central actuating rod connected to the wedge members via cam means such that the wedge members are positively driven by the cam means in both radial directions of movement.

Abstract: A polygonal lay down indexable cutting insert for a centrally located island and light feed and light depth of cut applications. The insert has a variable land surface angle which is 14.degree. at each corner of the insert and merges into a 12.degree. as measured along the flanks of the insert. A second descending angle is 27.degree. along the flanks. The corners are radiused along the variable land surface and the descending angle surfaces to impart better strength and cutting for the insert. Moreover, the first variable descending angle is greater than the first variable descending angle along the flanks of the insert.

Abstract: A polygonal, indexable cutting insert having a positive rake and a cutting edge having a truncated sinusoidal form. Serrations on the side faces extend perpendicular to the top face.

Abstract: A method for machining a high temperature nickel based alloy workpiece or other difficult-to-work material. The method involves machining the workpiece at an effective cutting speed of up to about 1500 sfm per minute, moving a ceramic-metal cutting tool across the face of the workpiece at a rate of up to about 0.04 in/rev, and cutting the workpiece with the ceramic-metal cutting tool to effect a depth of cut of up to about 0.15 inches per pass. The ceramic-metal cutting tool has a density of at least about 95% of theoretical, and includes about 80-98%, preferably 88-96%, by volume of granular hard phases and about 2-20%, preferably 4-12%, by volume of a metal phase. The granular hard phases are (a) a major hard phase portion of alumina and (b) a minor hard phase portion of hard refractory metal carbides, nitrides, carbonitrides, and borides.

Abstract: A tool mechanism for machining a hole side surface, and for chamfering the ends of the hole, includes a boring cutter and two chamfer cutters oriented so that during an axial infeed of the cutter assembly the hole side surface is machined and a chamfer is formed at one end of the hole. The cutter assembly can be shifted transversely to position a chamfer cutter for machining a second chamfer on the other end of the hole. The cutter assembly is carried on a cutter support member that is swingably mounted on a tool body secured to the spindle of the cutting machine. An actuator device is movable along the tool body axis to adjust the position of the cutter support member.

Abstract: A U-shaped sheet metal brazing shim for disposition within a groove in a drill bit body to encircle the edge area of a plate-type cutting insert. Brazing alloy is provided to form bonds between the shim and opposed surfaces on the cutting insert and drill bit body. Closely spaced holes extend across essentially the entire surface of the metal sheet to provide thermal stress relief within the brazed joint. Border areas of the sheet are left unperforated so that edges of the sheet are relatively smooth and free of sharp projections that could cut into a person's hand while the shim is being handled or repositioned.

Abstract: An adjustable boring head that includes a main body member having a longitudinal axis, and a boring bar holder adjustably mounted in the main body member for slidable adjustments transversely across the longitudinal axis. A square cross-sectioned slideway is formed in an end face of the main body member for precise guidance and rigid support of the boring bar holder. The boring bar holder is a unitary one piece structure having a deep socket opening for rigidly mounting the boring bar.

Abstract: An insert having a cutting segment of a polycrystalline diamond or cubic boron wafered between two layers of a hard metal carbide is bonded into a pocket in a standard insert and machined to form a chip breaker having a clearance surface and expose the cutting edge of polycrystalline material integral with the cutting segment.

Abstract: A high depth, low force, polygonal throw away indexable cutting insert to turn ductile materials like steel at low to high cutting speeds and medium to high ranges of feed and depth of cut.

Abstract: A mechanism for clamping a cutting tool holder in a socket formed in an end face of a clamping unit in a cutting machine. An axially movable drawbar has a multiple number of flat surfaces obliquely angled to the drawbar axis for exerting cam forces on individual wedge elements that are slidably guided for outward movement into wedge lock engagements with an inturned flange on the tool holder. The wedge elements exert axial forces on the tool holder internal flange for simultaneously achieving a relatively tight fit of the tool holder in the associated socket and a seating of the tool holder against an end face of the clamping unit. The mechanism can be used in rotary or non-rotary machines.

Abstract: Chip control insert having parallel side central aperture diamond configuration, a planar recess below peripheral cutting edges on each side, and characterized by a planar locating surface surrounding the central aperture with a substantial area recess intermediate the aperture and locating surface, said locating surface having corner and intermediate radial projections with inclined side walls to provide effective chip breaking.

Abstract: A non-contact coolant supply apparatus for supplying coolant for cutting a workpiece wherein there is relative cutting motion about an axis of rotation between a cutting member mounted on a tool shank.

Abstract: A high feed/heavy depth of cut indexable insert for the aluminum wheel turning market featuring a cutting edge with higher elevation than the central island chipbreaker forms.

Abstract: A drill is provided having a generally cylindrically shaped body. The body has a rear end structured to releasably connect with a torque transmitting machine in a conventional manner. The body has a forward end which is provided with diametrically opposed seats. Each seat releasably retains a cutting insert. Each cutting insert has a cutting edge projecting forwardly from the forward end of the body. Further, the cutting inserts are oriented so that one cutting edge is at a ten degree positive lead angle and the other cutting edge is at a five degree negative lead angle, the angles being measured normal to the center line of the drill. In operation, the drill is used to provide a bore hole in a workpiece, the bore hole having a predetermined perimeter. As the rotating drill contacts the workpiece, the cutting edges contact the workpiece in a predetermined, progressive manner which thereby creates a plurality of spaced apart circular notches of differing depth in the workpiece.

Abstract: A rotary slotting tool that includes a circular tool body having a V-shaped groove in its peripheral edge to establish a centering plane for individual cutter element holders. A pocket is formed in the leading face of each holder for mounting an individual cutter element. The pocket structure configuration is varied between successive holders so that successive cutter elements overhang different side faces of the associated holders. A common cutter element configuration is used for all of the cutter elements.