Abstract: A cutting tool is disclosed, particularly a ball track milling cutter, comprising a tool holder in which a turnover cutting disc is received that includes four cutting edges of circular arc segment shape. The cutting disc is received in a slot dividing the tool holder into two clamping jaws and is adapted to be clamped in position by a clamping screw which extends diametrically and passes through the cutting disc in the area of an opening. In addition to the clamping screw a thrust piece is provided to press the cutting disc with two cutting flanks axially against abutment faces at the bottom of the slot.

Abstract: An end milling tool having an elongate body which has two flutes defining two elongate lands extending generally in an axial direction of the body. The two lands have first and second flute surface each facing in a direction of rotation of the end mill. The end mill carries at least two peripheral-cutting inserts for peripheral milling, an inner drilling insert for cutting a radially inward portion of a hole, and an outer drilling inserts for cutting a radially outward portion of the hole, each insert being replaceable and of a generally flat configuration having a back face held in contact with the appropriate surface of the body, and a front face opposite to the back face and including a cutting edge. The peripheral-cutting inserts are disposed in a staggered manner alternately in the first and second flute surfaces, such that the first flute surface carries the peripheral-cutting insert which is nearest to the end face of the body.

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: The present invention provides a drilling tool having a shank and at least one pair of identical cutting inserts, the inserts having an octagonal shape having alternate equal obtuse angles. Each of the inserts is arranged such that they each have a different radial displacement from the turning axis of the drill, the inner insert having a cutting path which overlaps the turning axis of the drill and the next outer insert having a cutting path which overlaps the cutting path of the inner insert. The cutting path of each insert is formed by the cutting edges either side of the obtuse angles of the insert.

Abstract: A reamer comprises a single, adjustable, elongate carbide blade clamped in position in an axial slot in the reamer periphery by means of a clamping plate, with the slot having a positive rake blade supporting fade so that the blade is adjustable along a line parallel to a tangent to the reamer periphery.

Abstract: A milling tool for cutting internally of a bore by means of replaceable bits. The tool comprises an elongate bar member an end portion of which includes a pair of axially outer portions which extend radially outwardly from a central portion and are disposed on respectively opposite sides of the rotational axis. A pair of clamping members are detachably attached to the bar member on respectively opposite sides of the rotational axis and have axially outer portions which together with the axially outer portions of the bar member form an axially outer surface of the tool. The axially outer portions of the bar member and the clamping members cooperate to form four slots in the tool axially outer surface for clamping engagement of radially extending bits.

Abstract: A cutting tool having an upper cylindrical body and a lower cylindrical body with flat surfaces on opposite sides of the lower cylindrical body, a pair of flutes in said lower cylindrical body and one cutting element indexible to three separate positions and another cutting element carried within said flute and means for detachably securing said cutting elements, and a cutting element in the opposite flute having three cutting edges.

Abstract: A removable and indexable insert includes forwardly and rearwardly projecting faces forming cutting edges with side surfaces and concave end surfaces forming side cutting edges.

Abstract: A cutting insert for a cutting tool includes a cutting edge having a concave portion and a rear portion. The concave portion is disposed in the plane of one side surface of the insert and engages a workpiece in advance of the rear portion of the cutting edge. The latter extends from a radially outer end of the convex portion and has components directed radially outwardly, longitudinally rearwardly and toward the opposite side surface of the insert. The rear portion sequentially engages the workpiece to reduce the amount of vibration of the tool.

Abstract: A material removing tool includes an elongated shank having a rear end portion arranged to be driven by the motor of a boring or milling machine and a front end portion provided with a coaxial stub which is received in a socket between two legs of an adapter which carries the cutting implement. At least one of the legs has a radial hole which is in near register with a tapped bore of the stub. The shank portion of a screw, whose head bears against a conical surface surrounding a portion of the hole in the one leg, meshes with the threads in the tapped bore of the stub to urge the rear edge faces of the legs against complementary surfaces provided on two shoulders forming part of the front end portion of the shank. This enhances the resistance to bending stresses and prevents wobbling or vibration of the adapter relative to the shank.

Abstract: A cutting tool having an upper cylindrical body and a lower cylindrical body with flat surfaces on opposite sides of the lower cylindrical body, flutes in said lower cylindrical body and three triangular cutting elements indexible to three separate positions secured in said lower cylindrical body and means for detachably securing said triangular cutting elements, one of said cutting elements having three cutting edges for each position and the other two of said cutting elements having one cutting edge for each position.

Abstract: A trepanning cutting tool for producing a through hole in a metal workpiece by cutting an annular groove about a removable core utilizes four (4) carbide cutting inserts. The cutting inserts are so arranged that they sever the radial span of the annular groove into six (6) relatively small segments which can be readily evacuated from the cutting region in the form of chips.

Abstract: A rotary material removing tool whose holder can be installed in and rotated by a milling or like machine. The front portion of the holder has a transverse slot flanked by two prongs and receiving a portion of a flat cutter which is held in the slot by one or more coupling screws in such a way that its rear surface is urged against the bottom surface in the slot. The coupling screw is received in a bore of one of the prongs and its head extends into a bore of the cutter. The peripheral surface of the head and/or the surface surrounding the corresponding portion of the bore in the cutter is conical, and the two surfaces cooperate to urge the rear surface of the cutter against the bottom surface in the slot when the screw is driven home. To this end, the axis of the bore which receives the shank of the screw is disposed between the axis of the bore in the cutter and the bottom surface in the slot.

Abstract: A hole cutting tool of the type operable to produce a circular hole by cutting only the circumferential areas thereof, comprising removable cutting inserts which are received in a cutting head of the tool and are engageable with a workpiece to produce a desired hole. A cooperative wedge-like relation between the inserts and wedge elements of the tool secures the inserts in slots in the cutting head and permits use of the tool in reduced sizes.

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 intramedullary reamer comprising a tapered cylindrical body member, a groove extending along the opposite sides and across the small end of the body member, a plurality of longitudinally disposed valleys disposed in advance of the groove to facilitate removal of cutting chips and a replaceable blade adapted to fit into the groove in the body member, the cutting edge of the blade being exposed above said groove, the open end of the blade being provided with locking means to secure the blade to the body member.

Abstract: Shoe members and drill shank members for large diameter cable drilling bits are provided with a tongue on one of the members that projects axially relative to the drill shank member and with an arcuate lip and projecting stop on the other of the members to trap the tongue and prevent radial movement of the shoe member in response to radially directed forces caused by the spinning of the bit in drilling operations. Such forces would impose shear stresses on the fastening members that extend through the shoe member and axially into the drill shank. Four embodiments are disclosed: a spudding bit, two star bits and a scow bit.

Abstract: A rotatable shell cutter has a cylindrical member which advances to cut into a pipe. A plurality of cutting elements are arranged in a circle at one end of the cylinder. Each cutting assembly comprises a cartridge fixed as one piece to the cylindrical member, such as by brazing or the like, a seat positioned thereon through dowel pins, a cutting insert mounted on the seat through a cooperating V-shaped projection and recess, and a clamp engaging, positioning and securing the cutting element against the seat and also secured to the cartridge for urging all of the cutting assembly elements together.

Abstract: To form holes of small diameter, a drill includes a single cutting insert having an active edge portion with two oppositely facing cutting edges. When the drill is rotated, one cutting edge of the insert cuts the center portion of the hole while the oppositely facing cutting edge cuts the peripheral portion of the hole.

Abstract: An apparatus useful for forming in a curved surface, an enlarged hole surrounded by an upturned flange whose unattached edge lies substantially in a common plane, uses a drill rod, a set of bits, and a mechanism for forming an upturned flange. A first bit attached to the lower end of the rod forms an initial hole. A second bit, spaced axially along the rod, forms a widened oval hole with tapered sides upon continued axial and rotary movement of the rod relative to the workpiece. A flange forming mechanism is then extended beneath the edge region of the hole and pulled through the hole while rotating, to form the upturned flange. A third bit mounted peripherally with respect to the second bit is used to smooth and level the flange edge and to provide it with a desired shape.

Abstract: To provide for self-centering of boring tools, particularly of larger diameter boring tools having replaceable rotatable cutter bits, the cutter bit closest to the central axis of the tool holder or tool shank, i.e. the radially innermost bit is formed with auxiliary cutting surfaces adjacent the corners of a square or parallelogram-shaped bit, for example by chamfering the corner, with a relief surface therebehind, and positioning the auxiliary cutting surface to intersect the central axis of the boring tool so that, in operation, a small conical tip will be left which is continuously reduced in size and cut; and wherein the cutter bits are positioned on the tool bodies to present cutting edges at the end face which overlap with respect to workpiece removal, so that each cutter bit will independently cut into the workpiece, at least the inner cutter bit being guided in its cutting circle by the radially outer corner fitting against the surface cut in the workpiece.

Abstract: The present invention relates generally to spade drills and more particularly to an indexable spade drill blade which is adapted to be clamped in the clamp slit of a boring bar or holder and which may be readily reversed so that an unused cutting edge may be brought into play for further boring when wear has taken place on the cutting edges. Essentially the spade cutting blade is formed with an eccentric to permit indexing and must be used with an appropriate boring bar or holder which has a shape such that the cutting point of the eccentric blade is brought on the shank center line of the boring bar or holder.

Abstract: A machining tool comprising a rotatable holder, a removable, axially adjustable leading element, such as a drill bit, mounted in the holder and a throw-away cutting insert mounted in a fixed, unadjustable position on the holder to fix the position of the cutting edge on the insert axially in relation to the leading element and the holder.

Abstract: A reamer has a head with a recessed bearing plane which absorbs the pressure of a clamping member which presses against one side of a cutter knife. A counter member is positioned with one side displacable on the recessed bearing plane in the direction of increased cutting diameter. The cutter knife is held between the clamping member and the counter member. The counter member has a region with a straight holding portion which supports the cutter knife. The clamping member and counter member have congruent oblong holes which extend in the direction of increased cutting diameter. These holes are traversed by a clamping screw which is screwed into a threaded hole in the head. When the screw is tightened, the three piece unit of clamping member, cutter knife and counter member are tightened in the reamer head.

Abstract: A tool support is provided for removably supporting a twist drill of high speed steel and a pair of indexable cutter blades of tungsten carbide. The cutter blades are triangular and provide three cutting edges about the periphery thereof, and the cutter blades are removably mounted on the tool support to enable selective indexing of the cutting edges to a cutting position. The cutting edge to be used is axially and radially stabilized in the cutting position by engaging edge and bottom portions of the blade in a pocket provided on the tool support. The tool support includes a channel adjacent each of the cutter blades defined by walls extending axially of the tool support in planes parallel to the tool axis and perpendicular to one another to optimize the available area for chip removal, and the entrance ends of the channels are provided with relief surfaces to promote the feeding of chips into the channels.

Abstract: A hand held tool for installing a threaded fastener in which the tool is adapted for use solely as a drill bit, solely as a screwdriver, and as a combination thereof, wherein the threaded fastener has a central bore extending therethrough. Extension of the drill bit beyond the end of the screwdriver blade may be selectively controlled, and the drill bit may be maintained in its entirety within the shaft of the screwdriver when not in use to thereby preserve the sharpness of the drill bit. A unique locking collar is also provided.

Abstract: A boring cutter which is adapted to be rotated about its central axis includes at least one insert pocket having opposed parallel leading and trailing walls, as well as a bottom wall. An insert seat of generally L-shaped configuration is provided, with the leading surface of the insert seat being in abutting relationship with the leading wall of the pocket. The opposed trailing surface of the insert seat includes both a leading and rear locating support surface adapted to receive an indexable cutting insert. A wedge is receivable between the rear surface of the cutting insert and the trailing wall of the pocket. The radial position of both the insert seat and the wedge, relative to the central axis of the boring cutter is adjustable. By this arrangement, the radial position of the cutting insert may be varied to thereby adjust the effective outer diameter of the boring cutter.

Abstract: To reduce the requirement for stocking different types of holder plates for cutting chips 9, at least the chip holder plate 16 carrying the radially outermost chip, and the next adjacent chip holder plate 6 carrying the radially more inwardly positioned chip, have mutually engaged common abutment surfaces 19, 27. The tool body 1 is formed with a recess 5 in which the radially outermost chip holder plate and the next adjacent plate are commonly secured, for example by clamping bolts or screws extending inwardly into the tool body at an angle with respect to the tool body axis 26. All of the radially inwardly positioned chip holder plates 6 are of equal size and shape. The boring or drilling diameter of the tool is defined by the width of the radially outermost chip holder plate and the chip positioned thereon.

Abstract: There is a disclosed tool holder and bit construction for use in precision machining operations, wherein the tool holder is provided with means to removably position the same for rotation by a machine spindle, and a cavity of precise rectangular uniformly diminishing cross-section inwardly from one end, to receive a mating correspondingly precisely formed tool bit comprised solely of a carbide composition and integral shank to be positioned in and removable from the cavity when conditions require, means being provided in said holder to facilitate such removal.

Abstract: A plurality of cutting plates are mounted in a recess forming a mouth at one end of a drill bit and each cutting plate has a plurality of cutting edges. The drill bit mouth provides chip removal. In the cutting position, the cutting plates are arranged in a plane extending in the direction of the axis of rotation of the drill bit and the cutting edges are arranged in a step-wise manner. The cutting plates can be turned for arranging different ones of the cutting edges in the cutting position. The cutting plates extend radially outwardly from the axis of rotation with one plate adjacent the axis of rotation and the at least one other plate extending radially outwardly from it. The cutting plates have a parallelogram shape in the axial plane of the cutting position. In the cutting position, cutting edges of the cutting plates are in parallel relation to one another with adjacent parallel cutting edges on adjacent cutting plates being in contact with one another.

Abstract: A drill having at least two indexable radially spaced inserts arranged with axially projecting cutting points to machine overlapping concentric grooves, the outermost insert machining a groove having an outside diameter equal to the diameter of the hole and the innermost insert machining a groove overlapping the center of the hole, and radial components of the cutting thrust on said inserts being in opposition and balancing each other. The cutting thrust may be balanced by the number, shape and/or the rake of the cutting edges.

Abstract: A combined boring and milling tool has at least three triangularly shaped turnable cutter blades. The effective cutting edge of the first turnable cutter blade extends as bit (or drilling cutting edge) from the periphery of the shank at least to its axis. A second turnable cutter blade is offset 180.degree. peripherally from the first and its effective cutting edge extends as cutting edge on the periphery of the shank parallel to the shank axis. A third turnable cutter blade is offset axially from the first so that its effective cutting edge extends as a cutting edge parallel to the shank axis. The two effective cutting edges of the second and third turnable cutter blades lie on the same flight circle and their working ranges overlap axially. The first and third turnable cutter blades have a common chip space.

Abstract: In a boring tool for making borings in solid metal material of workpieces, at least one cutting bit is interchangeably arranged in a recess, at the end of the borer shank. The polygonal cutting bit has a plurality of cutting edges of equal length, of which two are in engagement with the workpiece at each time. For the purposes of improved centering of the borer, these two operative cutting edges each form approximately the same angle to a line parallel to the borer axis. A plurality of cutting bits at different radial distances may also be arranged in the boring tool, with two cutting edges of each cutting bit being in engagement with the workpiece and the working regions of the cutting edges of adjacent cutting bits each overlapping somewhat.

Abstract: A boring bar whose body has an inclined end surface on one free end thereof against which an elongate cutting member is positioned. The inclined end surface has a recess extending inwardly therefrom in which a yoke member is positioned, the yoke member having a portion extending outwardly beyond the inclined end surface and perpendicular thereto and surroundingly engaging the cutting member, and a screw or other suitable securing element cooperates with the yoke member for applying an inward force thereto in a direction perpendicular to the inclined end surface for clampingly securing the cutting member firmly against the inclined end surface of the body.

Abstract: Tool for drilling holes, such as cylinder head drill, woodworking drill, and the like, which includes a carrier member having at least one endwise arranged end face cutter, or first cutting means, and at least one precutter, or second cutting means, extending in endwise direction, and circumferentially beyond the carrier member, the precutter defining the diameter of the hole to be produced with the tool and including at least one cutting edge. At least the part adjacent the cutting edge of the precutter is approximately parallel to the pertaining circumferential portion of the carrier member. The outer side of the precutter includes at least one guide surface parallel to the outer circumferential portion of the carrier member. The end face cutter and the precutter are removably securable with at least one clamping element to the carrier member and can be in the form of reversible cutting elements.

Abstract: An indexable insert drill having a cylindrical body with two flutes and a cutting insert mounted at the end of each flute. The cutting inserts are mounted so that each presents a cutting edge of a length less than the radius of the drill with each edge being positioned to provide negative lead and effectively neutral radial and axial rake. The first of the cutting edges intersects the longitudinal axis of the drill body and extends radially outward to an end area spaced inwardly from the circumference of the drill body. The second of the cutting edges extends from an outer end area radially outward of the drill body circumference to an inner end area radially inward of the radial outermost end of the first cutting edge. Preferably, the first cutting edge extends over two thirds of the radial dimension of the body and has an effective cutting length of at least twice that of the second cutting edge.

Abstract: A drilling bit has cutting edges radiating from its axis, each being a segmental part of a circular cutter the axis of which is substantially tangential to a circle centered on the bit axis, the cutters being at different distances from the bit axis. The cutters may be rotated to enable worn cutting edges to be replaced and the extremities of all cutting edges are substantially in a plane normal to the bit axis.

Abstract: A drill body for drilling solid metal and for finish boring having, at the working end, two or more replaceable, indexable, hard metal inserts dimensioned and spaced radially to cut equal volumes of metal. The inserts are retained in pockets by a headed screw with a through passage for a wrench. The outside insert is also shaped and positioned so the drill body may be shifted radially from the drilling axis and used as a boring bar.

Abstract: A countersinking tool comprises a disposable, flat, chip-like cutting insert mounted on a holder rotatable about its axis. The insert is readily assembled or disassembled on the holder by turning a pin which extends through holes in the insert and the holder. The insert has a flat inside surface for seating on a flat surface on the holder, and the insert has a pair of flat, peripheral side surfaces each of which engages against a respective flat surface or locating portion on the holder to locate the insert in a cutting disposition on the holder. The insert and the holder have various features which cooperate to promote the countersinking function.

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 boring device adapted for deep boring wherein the boring head has a plurality of cutting inserts adjustably mounted on the boring head. Axially extending guide plates are mounted on the periphery of the boring head and are substantially equidistantly disposed between adjacent cutting inserts.

Abstract: A tool for removing a disk or cylindrical core from a workpiece which includes a shank, an extension piece and cutting elements, the extension piece being in the form of a hollow cylinder and including apertures in the wall thereof for the introduction therein of a coolant. An axially movable centering element is positioned with the extension piece, the centering element including a centering spigot which fits into a cup-shaped centering piston, plate springs within the piston and against which the centering spigot is movable, and an elastic ring therearound for contact against the inner wall of the hollow cylinder.

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 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 drill bit or other working tool is provided with driven end segments which are removably received in longitudinal slots formed in a shank. The slots bottoms are contacted by the driven end segments to align the working tool with the shank; and, slot side walls contact the driven end segments for transmission of torque to the working tool. The working tool and shank are formed separately, then connected together, and the shank is connected to and driven by a rotary device.

Abstract: A rotatable shell cutter member for cutting a hole in large diameter and thick wall plastic pipe. The shell cutter member is rotated and advanced with a positive predetermined lead against the plastic pipe and it first forms a hole in the plastic pipe by cutting and retaining a coupon therefrom and it further progressively enlarges the hole to a diameter equal to or slightly greater than the overall outside diameter of the shell cutter member. The chips initially cut from the plastic pipe in cutting the coupon are discharged upwardly and inwardly of the shell cutter member above the coupon being cut and, when the shell cutter member with its cutting edge in constant cutting engagement with the pipe begins cutting a continuous chip cut, it is also discharged upwardly and inwardly of the shell cutter member.

Abstract: An extension for a boring rod with two counter-rotating boring tool carriers. The boring tools of the carriers are arranged at opposite ends of the boring tool carrier and displaced through 180.degree. relative to each other. The boring tool carriers have a cylindrical shaft and are each guided within a chuck socket, which sockets have a cone on their external ends and both sockets are arranged within a through longitudinal bore in a housing capable of being mounted within the boring rod. Threaded rings are screwed into each end of the longitudinal bore and act in conjunction with the chuck socket through their internal conical part to effect an axial seating between the inner end of the chuck socket and an adjusting bushing, movable within the longitudinal bore, which engages by means of two threads running counter to each other with the corresponding threads of the boring tool carrier. A centering device is provided between the housing and the boring rod.

Abstract: A tool for preparing tube ends for welding comprising a rotary tool head connected to the drive shaft of an air motor driven angle drive unit, said tool head having a plurality of radially extending arms provided with inclined cutting edges operative, upon rotation of the tool head and axial advance thereof with respect to the tube, to chamfer or bevel the end of the tube for welding, said tool head further being provided with guide means for rotation of the tool head about the tube axis. One form of tool herein is further characterized in that the cutter carrying arms are radially adjustable for chamfering different sizes of tubes. Another form of tool herein is further characterized in that at least one of the cutters is indexable to a position wherein the cutting edge thereof is perpendicular to the axis of the tube to dress the end surface of the tube.

Abstract: A boring bar having a removable indexable cutting insert with a plurality of cutting edges is disclosed. The cutting insert is held in place in the bar by a locking finger on an insert clamp which is locked into place by a ball which is wedged against a release pin that engages the clamp. The ball may be moved so as to allow the pin to move, thereby releasing the force applied by the clamp whenever the insert is to be indexed or whenever a replacement of the insert is required. This is achieved by either manual or hydraulic control of a wedge shaft that engages the ball.

Abstract: A cylindrical deburring tool is provided with a diametric guide slot extending through the body with a pair of cutter blades received in said guide slot for radial displacement therein and spring-biased apart to a position determined by an adjustable abutment means acting on each blade.