Abstract: An improved bond between diamond and a metallic matrix can be achieved by hot pressing the metallic matrix onto a cleaned polycrystalline diamond (PCD) element. The PCD is degreased and then maintained substantially free from subsequent oxidation. The cleaned nonoxidized PCD is then disposed within a hot press and bonded under pressure and temperature with a conventional metallic matrix to form a cutting element. The cutting element thus formed is comprised of a PCD portion and a metallic portion with a high strength bond formed therebetween, on at least one surface of the diamond and, preferably, two adjacent surfaces. Typically, the metallic matrix is a carbide-forming metal or mixture of carbide-forming metals, and the diamond is a thermally stable porous, sintered polycrystalline product. The insert is subsequently placed within a bit mold and a bit is fabricated according to conventional powder metallurgical infiltration techniques.

Abstract: In the known, adjustable, single-cutting-edge machine reamers having a turnable cutting plate, the adjusting and re-adjusting operations are awkward and associated with difficulties because, at least as far as adjusting is concerned, adjustments have to be made at two points, and moreover for adjusting to the set desired value it is generally necessary to proceed in a step-by-step manner, gradually working ones way up to the desired value. These problems are due to the fact that adjustment can in principle only be made in the forward direction, that is to say in the direction of increasing diameter, whereas reverse adjustment in the proper meaning of the term is not possible but can only be achieved indirectly by carrying out a new adjustment with a lower starting value and adjusting in a forward direction.

Abstract: A guide member is removably, but self lockingly, mounted on a cutter head. The cutter head has a dovetailed recess which receives the guide member. One side of the recess has bores which accommodate elastic elements which protrude into the recess. Friction coupling between the guide member and the elastic elements prevents axial movement of the guide member.

Abstract: An indexable insert drill is disclosed that avoids formation of a breakout slug and therefore is particularly suited for drilling a laminate workpiece or stacked workpieces. The tool includes a cylindrical body provided with opposed flutes. A radially inner indexable carbide insert is releasably secured in the back wall of one flute at the leading end of the body and a radially outer insert is similarly secured in the back wall of the opposed flute. The inserts present an active cutting edge generally disposed in a transverse plane containing the axis of the tool and in axially leading relation relative to the tool body, and together are adapted to cut a hole of given diameter with the active cutting edges providing for overlap therebetween.

Abstract: A rotary cutting tool which comprises an elongated body attached to be rotatably driven around its longitudinal axis. An axially extending slot is formed at one end of the body while a cutting insert having a cutting edge is axially insertable into the slot. A pair of diverging abutment surfaces on the body extend inwardly into the slot. These abutment surfaces cooperate with diverging mounting edges formed on the cutting insert to automatically orient the cutting insert upon insertion into the slot to a predetermined position with respect to the body. The cutting insert is secured to the body in a conventional manner, such as soldering.

Abstract: An indexable insert drill particularly suited for use in machining soft metals such as aluminum or the like. The drill includes an elongated body having a drilling portion with at least one groove extending axially along a portion thereof from the drilling portion end. In one embodiment, a generally triangular cutting insert is fixedly mounted in a receiving pocket included in the groove so that in cutting presentment, the insert cutting edge extends radially of the drilling portion from an innermost end area at the drilling portion longitudinal axis to an outermost end area outwardly of the drilling portion side wall. The cutting insert is configured so that the cutting edge will have neutral lead, neutral radial rake and positive axial rake when the insert is mounted in the receiving pocket. The receiving pocket includes a back tapered side wall defining an insert retaining area for conveniently capturing a side of the cutting insert.

Abstract: A tool holding device for holding a cylindrical barrel in a cylindrical chamber which includes a two-part barrel with the parts axially oriented having facing chamfers to form a V-groove which receives a split ring. The retaining barrel has a rearwardly facing shoulder which form an annular abutment for the periphery of the ring when the ring is expanded by drawing the parts of the barrel axially toward each other.

Abstract: A drill bit comprising a shank having three cutting blades extending radially therefrom with the longitudinal cutting edges of the blades defining a right circular cylinder coaxial with the axis of the shank. At the working end of the shank a countersink cutting point is formed by the cutting edges of the blades sloping together to a common point on the axis of the shank and defining a right circular cone.

Abstract: An indexable insert drill employing a plurality of inserts located substantially in a single radial plane characterized by a round innermost insert having its arcuate cutting edge extending across the axial center line of the drill. One or more supplemental inserts, preferably square in configuration and including chip interruption notches positioned for positive axial lead, continue the cutting action radially beyond the arcuate center cut of the round insert with an outermost corner adapted to finish cut the side wall diameter of the hole.

Abstract: A single-point metal machining cutting tool takes the form of an elongated bar whose opposed ends are provided with transverse flat bottom, flat wall grooves intersecting the axis of the bar. Tip holders of complementary flat wall configuration may be mounted within the grooves, held in position by a screw passing through the tip holder at its center and received within a tapped and threaded axial hole within the ends of the cutting tool bar. Shear forces during cutting are not transmitted from the tip holder to the bar through the screw, strain on the screw is eliminated, and the ability of the bar to withstand torque during cutting is maximized by the axial location of a single screw hole at each end.

Abstract: An indexable insert drill with a parallelogram shaped insert positioned at a negative axial lead, the insert having a slanted recess which provides an angularly oriented cutting edge extending from a face cutting corner through or slightly under and substantially beyond the drill axis, and a unique notch in the cutting edge providing chip interruption and stabilized lead.

Abstract: A carriage and guideway unit for a machine tool having a carriage carried by a pair of laterally spaced apart ways with a central portion of the carriage extending between and longitudinally of and bearing on the ways to align the carriage for longitudinal sliding movement along the ways. The carriage is reciprocated on the ways by a drive means having an actuator rod extending between the ways and connected to the carriage such that the centerline of action and reaction between the drive rod and the carriage is centered between and extends longitudinally of the ways and is in the plane of the faces of the ways carrying the carriage.

Abstract: A tool shaft is detachably fastened in a tool holder by means of a plurality of gaskets which are each sandwiched between a pair of press rings. The tool shaft extends through the press rings and gaskets. A screw is provided for compressing the gaskets between the press rings. The gaskets are disposed in recesses of larger volume. The gaskets are nonsymmetrical about the longitudinal axis of the tool shaft. When compressed, the gaskets force the tool shaft laterally against the rings to prevent radial misalignment of the tool shaft.

Abstract: A rotary drill comprises a shank, two axially extending chip removal recesses, and at least two radially oriented cutting inserts. One insert is peripherally located and is arranged adjacent one of the chip removal recesses. The edge of the peripheral insert extends radially so as to form the wall of the hole to be drilled. Another insert is located radially inwardly of the peripheral insert and is arranged adjacent the other chip removal recess. The inserts extend axially to generally the same extent. The inner insert is offset from a 180 degree relationship with the peripheral insert by an angle, which angle is of such magnitude that the drill is radially balanced.

Abstract: An indexable insert drill employing a pair of radially opposed inserts having either positive or negative axial lead cutting edges extending in the same cone of revolution. One of the inserts has a radially inner arcuate corner intersecting and extending across the axial center line. The other insert is located relatively overlapping but outward radially with an outermost corner adapted to finish cut the side wall diameter of the hole. Insert cutting edges provide for chip interruption and breakage.

Abstract: A drill for producing close tolerance holes in non-ferrous and non-metallic composite materials in which the essentially cylindrical size of the body of the drill is maintained all the way to the drilling point, the cylindrical shape as it approaches the drilling point is tapered by being flattened off on opposite sides to taper the body, and the drilling point has symmetrically formed and angularly related cutting edges in the opposite edges of the flattened and tapered body. The drill having the foregoing characteristics may be combined with a countersink formed either separately from or as an integral part of the drill.

Abstract: A cutting tool which may comprise: an elongated bar member having a body portion and an end portion; and an anvil member removably fastened to the end portion of the bar member for rigidly clamping a cutting insert to the bar member for radial projection therefrom. The end portion of the bar member and anvil member, when fastened together, may form a cylindroid which in at least some embodiments may have a central longitudinal axis which is parallel but offset from the central longitudinal axis of the bar member body portion.

Abstract: A single flute drill having a single, replaceable cutting insert which can drill from the solid, as well as being used for other single point machining operatings such as turning, internal and external diameter boring, contouring and facing. The insert is configured and related to the drill body so as to provide a single, radially extending cutting edge which has an effective neutral rake and negative lead. A specific insert structure is also provided for use in the drill. The disclosed insert comprises a solid body having parallel upper and lower faces each generally in the shape of an equilateral parallelogram and joined along their peripheral edges by side walls. One cutting edge is formed along the juncture of one side wall and the upper face and is inclined along its length toward the lower face. A second cutting edge is formed along the juncture of the lower face and a second side wall which intersects the first side wall at a corner.

Abstract: A combination work tool and holder therefor, wherein the work tool is stabilized during work movement by the provision of an independently movable stabilizer bar mounted alongside and generally parallel to a tool holding bar, a rigid member clamping the bars together in order to increase the rigidity of the tool holding bar. The ability of the stabilizer bar to be independently moved enables the two bars to be clamped together in various positions in order to eliminate interference with working clearances and the like. Additionally a holding block construction for positioning the bars with respect to each other is disclosed.

Abstract: A drill comprising a shank and an elongate body with an axial slot near one end thereof. A generally hexagonal insert of sintered tungsten carbide or high speed steel is placed in the slot and received in a V-shaped seat formed in the bottom of the slot. A cross-screw extends through a hole in the insert and serves to clamp the slot closed upon opposite sides of the insert. In a preferred embodiment a passage extends axially through the drill body, and the insert seats in a separable anvil which is located by means of a tang registering in the axial passage.

Abstract: A cutting tool is disclosed which has an axis of rotation and comprises a cutting portion having a tapered body and a generally conically shaped surface. Wall means extend radially into the tapered body and define a curved cutting face wall. A relieved land surface extends to and meets the cutting face wall to define a curved cutting edge. The curved cutting edge is located substantially on or at the conical surface of the tapered body. A lateral support surface is located substantially at or on the conical surface of the tapered body and at a positon generally diametrically opposed to the curved cutting edge. The conical surface of the tapered body is substantially recessed rotatively ahead of the cutting edge to the lateral support surface to provide space for chips and is, also, sufficiently recessed rotatively rearwardly of the cutting edge to the lateral support surface to prevent that area from making contact with the workpiece.

Abstract: A cutting tool holder includes an elongated holder body having a first end face through which passes a shaft receiving bore which extends longitudinally through the holder body to receive an elongated tool mounting shaft therein. The tool mounting shaft has an end collar at one end and is threaded at its opposite end to be releasably fastened to the holder body with the shaft extending through the holder body, and the tool mounting portion of the shaft protruding therefrom. A plurality of substantially disc-shaped shaft mounted members, including cutting tools and spacers, have opposite faces and are received in face-to-face relationship on the tool mounting portion of the shaft, between the end collar and the holder body end face. The end collar and each shaft-mounted member is provided with locator means comprising complementary-shaped recesses (holes or grooves) and protrusions (pins or bars) formed, respectively, on the adjacent faces thereof.

Abstract: A boring tool for working a small diameter bore in a workpiece having a shaft of circular cross-section comprising a clamping portion for supporting the tool and a neck portion extending forwardly therefrom. The forward end of the neck portion carries a cutting plate. The cutting plate is located entirely within the circular cross-section of the neck portion, except for a cutting point on such cutting plate which extends somewhat laterally beyond the circular cross-section of the neck portion. The neck portion has a channel of semicircular cross-section which spirals from the front end thereof toward the clamping portion of the shaft, the spiral being in the directions of rotation and of feed of the workpiece with respect to the tool. In a modification, a cuttings breaker is mounted to overlie the cutting plate, extends close to the cutting point and has an axially extending cuttings breaking channel running the length thereof parallel to the axis of the neck portion and opening toward the cutting plate.

Abstract: A drill having inner and outer indexable cutting inserts for forming a hole in a workpiece. The inner insert is positioned at a non-negative radial angle and is set out axially ahead of the outer insert to increase the service life of the inserts. Tungsten carbide wear strips are spaced angularly around the drill body to limit radial movement of the body and to prevent the body from wearing.

Abstract: A tool such as a drill, etc. made of a hard metal, e.g., a cemented carbide, having applied thereto a coating film of a noble metal such as gold, silver, platinum, etc. by means of an ion-plating treatment.