Abstract: A cutting insert shapes metallic workpieces by chipping. The cutting insert is especially suited for use in solid drills or double-bit cutters. It has at least one cutting edge which is delimited by a chipping face and a flank extends between two cutting corners. The cutting edge includes two sections which form an obtuse angle and in the area of a roof-shaped tip merge into each other. The chipping face has a raised shaped chipping element which extends from the inside of the chipping face as far as the cutting edge, from where it reaches beyond the roof-shaped tip partially across the two sections of the cutting edge. The cutting edge sections and the adjoining chipping faces include a step delimiting the shaped chipping element, the edges of which step serve as additional cutting edges of the shaped chipping element.

Abstract: A spotting drill and milling cutter (10) having a shank (30) and a pocket (50) for receiving an insert (52). The cutter is capable of forming a spotting hole (12) having a concentric circular cavity (16) at the bottom of the spotting hole. Insert (52) includes a primary cutting edge (54), a secondary cutting edge (64) and a tertiary edge (68) having a cutting portion (68a). The primary cutting edge terminates at a point (56) which is radially offset about 0.001″ to 0.100″ with respect to rotation axis (36) of the cutter. Primary radial relief surface (76) associated with the primary cutting edge and secondary radial relief surface (78) associated with the secondary cutting edge are provided to reduce back dragging relative to the primary and secondary cutting edges.

Abstract: A twist drill includes a shank which defines a longitudinal center axis and has a helical, chip-transporting flute formed therein. A cutting insert is arranged at a front end of the flute. The insert includes a body forming a cutting edge and a flank surface arrangement situated behind the cutting edge. The flank surface arrangement includes first and second flank surfaces extending at respective first and second acute angles relative to a reference plane which contains the center axis. The sizes of the first and second acute angles are different from one another. In one embodiment, each of the first and second flank surfaces intersects the cutting edge. In a second embodiment, only the second flank surface intersects the cutting edge, with the first flank surface extending from a rear end of the second flank surface.

Abstract: A complex cutting-blade tool wherein a neck having a smaller diameter than the diameter of the drill thereof is connected to a shank. At the place where the drill and the neck are connected is provided a burr removal cutting blade inclined roughly 45° from the tool center axis. A hole entrance beveling cutting blade is also mounted through fixture to the neck, inclined at an angle of roughly 45° from the tool turning center axis, in a direction opposite to the burr removal cutting blade. The fixture can be secured at any position along the length of the neck, wherefore the distance between the burr removal cutting blade and the hole entrance cutting blade can be suitably adjusted so as to correspond to the depth of the machined hole (i.e. the thickness of the workpiece).

Abstract: A cutting insert for a borer or reamer comprising a flat blade having a front face with at least one cutting edge, the front face having at least one depression, or dimple, having clamping faces therein which are frustoconical and which in use engage a clamping screw whereby the blade is held in the reamer. The clamping faces extend in a direction parallel to the cutting edge, and the depth of the depression changing continuously in longitudinal cross-section.

Abstract: Proposed is a drilling tool for drilling in solid material, having a base body (1) containing chip flutes (5, 5a) and at least two interchangeable inserts (3, 3a) at the face of the base body (1). The inserts are arranged on the base body at different radial distances such that their working ranges partially overlap. The blades (12) of the inserts (3, 3a) are formed by two cutting edges (8, 9) which together form an obtuse angle, that is the point angle (11). The face (13) of the blades (12) has parallel profile ribs (14, 14a) which act as runners and which in the region of the cutting edges (8, 9), aligned in the direction of chip removal, extend radially inwards over a curved course relative to their installed position, toward a flank region (17) of the insert (3, 3a) near the drilling tool axis (7).

Abstract: A wood coring bit having a base, a central guide shaft, a sleeve extending along the guide shaft, a pair of scribing teeth on the surface of the sleeve adjacent to the work piece, which scores a track into the work piece as the bit rotates and raker tooth on the surface of the sleeve adjacent of the work piece which is aligned to follow in the track scored by the scribing teeth and to cut and lift out the wood from the scored area. A helical slot extends through said sleeve from the raker tooth to receive the chip. A shank aligned with the guide shaft is used to connect the bit to a drill.

Abstract: A boring tool is provided with rotary cutting inserts which rotate as a result of the forces which act on the inserts as the tool bores a workpiece. The inserts are positioned on the tool so that the cutting point of each insert is located in a different radial plane along the axis of the tool. The inserts are also positioned on the tool so that the radial distance of the cutting point of each insert from the axis of the tool is different. The non-symmetrical positioning of the inserts on the boring tool provides improved performance of the tool over a tool in which the inserts are symmetrically positioned.

Abstract: The present invention is a drilling system for cutting flat bottomed holes in work pieces. The tool has two opposing angled cutting edges extending from a rotational axis, with the inner portions of these cutting edges extending upwardly to create an overlapping web at the center. The overlapping web strengthens the center portion of the cuttings edges of the tool. The angle at which the inner portion of the cutting edge is inclined can be increased to create a center point on the cutting surface of the tool. The center point adds stability to the tool as it rotates along its longitudinal axis. The cutting edge has a rake surface with a positive rake angle that lessens the forces on the insert and also allows for better formation of chips of stock material being removed. Chip breakers can be cut into the cutting edges of the insert, further aiding in the removal of stock material.

Abstract: A drilling tool is proposed comprising a shaft which has both a chuck shaft suitable for fitting in machine tools and a drill-holding shaft, known per se, with chuck grooves and (optionally) coolant ducts. A replaceable drill bit (1) is fitted in a positive fit and detachably on the shaft. The drill bit can consist of a homogenous material and has cutting edges (2) inclined radially outwards and backwards; these cutting edges can be formed in one piece from the drill bit material or are composed of blades mounted in the central region and made from the drill bit material and complementary blades orignating from a cutter plate screwed onto the drill bit. The invention proposes that the cutting edges (2) should be aligned symmetrically about the drill bit axis and the cutting edges should be in cutting engagement over the entire radius of the bore to be drilled.

Abstract: A drilling tool for machine tools includes a drill shank provided with a radially outwardly projecting feed helix. The drilling tool also includes a drilling head disposed at the end of the drill shank and having two segment sections which are delimited radially outwardly by partially cylindrical peripheral surfaces and separated from each other by axially parallel chip grooves which are adjacent in the peripheral direction. The drilling head also includes at least two cutting plates disposed at different radial spacings from a drilling tool axis and each having a cutting edge projecting beyond the drilling head. The chip grooves are delimited on the side of the cutting plates by at least one axially parallel radial chip-deflection surface and by a chip-guide surface disposed on the adjacent segment section.

Abstract: A combination drilling member includes an axially elongated drill, such as used for drilling rock, having an axially extending shaft (2) with a first end leading in the drilling direction containing a cutting bit (3). The shaft (2) has at least one helical drilled material removal groove (4) and an auxiliary element encircling and detachably connected to the shaft (2) intermediate the ends thereof. The auxiliary element (6) has at least one elastic plastic part (9) extending around the shaft and containing a through hole (10) for the shaft where the plastic part is secured to the shaft by at least one of frictional and positive locking engagement against inadvertent axial displacement and held against relative rotation to torques of up to 40 Nm.

Abstract: A cutting tool assembly for rotary cutting operations comprising a replaceable cutting head and a tool shank, having a common longitudinal axis and mating peripheral surfaces. The cutting head has a cutting head mounting portion at a trailing end thereof and the tool shank has a cutting head receiving portion at a front face thereof. The cutting head mounting portion and the cutting head receiving portion of the tool shank each have at least two coupling portions bound by associated peripheral surfaces of the cutting head and the tool shank and mating in shape and dimensions. Each coupling portion has a base surface, a torque transmission wall and a fixation wall, the fixation wall of each cutting head coupling portion having an angular extension smaller than a corresponding angular distance between adjacent extremities of the fixation walls of two different tool shank coupling portions.

Abstract: A drill includes a shank, a central insert and a peripheral insert. The shank defines a central axis of rotation and has pockets which carry the peripheral and central inserts. Chip flutes are formed in an outer periphery of the shank for conducting chips cut by the respective inserts. The peripheral insert includes a first operative cutting edge, and the central insert includes a second operative cutting edge which overlaps the first cutting edge at an overlap region. The central insert forms a rake surface adjacent to the second cutting edge. The rake surface includes a first portion disposed at the overlap region, and a second portion disposed at the axis of rotation of the shank. The first portion has a larger rake angle than the second portion.

Abstract: A drilling tool comprises a drill tip, a chip removal part which axially adjoins the drill tip, and a drill shank which is positioned at the end of the chip removal part. Two chip flutes extend in a helical manner over the chip removal part starting at the main cutting edges of the drill tip. The drilling tool is separated into two parts in the region of the chip removal part and consists of a base body which is connected to the drill shank as one part and an exchangeable tip made of a harder material which is connected to the drill tip as another part. The exchangeable tip is connectable to the base body in a form-fitting and/or frictional-fitting manner at an axial separation point.

Abstract: An orthopedic reaming instrument has a generally cylindrical housing having a first end and an opposed second end, an elongate shaft extending from the first end and a removable and replaceable cutting disc disposed at the second end. The housing has a slot defined in the second end that is transverse to a longitudinal axis of the instrument and divides the second end into two spaced apart wall members having arcuate outer surfaces and opposed spaced apart inner surfaces. The cutting disc has at least one cutting edge disposed thereon and is shaped so as to mate with the wall members. A removable and replaceable drill bit may also be provided which extends from a bore in the slot through an aperture in the cutting disc.

Abstract: Proposed is a drilling tool for drilling in solid material, having a base body (1) containing chip flutes (5, 5a) and at least two interchangeable inserts (3, 3a) at the face of the base body (1). The inserts are arranged on the base body at different radial distances such that their working ranges partially overlap. The blades (12) of the inserts (3, 3a) are formed by two cutting edges (8, 9) which together form an obtuse angle, that is the point angle (11). The face (13) of the blades (12) has parallel profile ribs (14, 14a) which act as runners and which in the region of the cutting edges (8, 9), aligned in the direction of chip removal, extend radially inwards over a curved course relative to their installed position, toward a flank region (17) of the insert (3, 3a) near the drilling tool axis (7).

Abstract: A rough boring tool is composed of a boring rod having a tool hole which is provided with a base line and a plurality of reading scales. The rough boring tool is further composed of a boring tool engaged with the tool hole and provided with a plurality of measuring scales corresponding in location to the reading scales and forming an angle with the base line. The advancement quantity of the boring tool can be easily observed with the naked eye by converging the reading scales of the tool hole of the boring rod and the measuring scales of the boring tool.

Abstract: The invention is directed at a drill tool assembly including a holder having a shank and head portion and having a axial centerline or rotational axis on which said holder is rotated in use. The head portion includes a holder slot at least over a central portion of the head, with the slot being oriented perpendicularly to the axial centerline of the holder. The holder slot also includes a locating boss extending upwardly from the bottom of the slot, which includes first and second surfaces, with at least one of the surfaces being located in a predetermined position with respect to the axial centerline of the holder, and substantially parallel to this centerline. A drill insert having first and second cutting surfaces is selectively positioned within the holder slot, and includes a locating slot adapted to be positioned in a predetermined orientation relative to the boss provided in the holder slot.

Abstract: A cutting tool assembly for rotary cutting operations comprising a replaceable cutting head and a tool shank, having a common longitudinal axis and mating peripheral surfaces. The cutting head has a cutting head mounting portion at a trailing end thereof and the tool shank has a cutting head receiving portion at a front face thereof. The cutting head mounting portion and the cutting head receiving portion of the tool shank each have at least two coupling portions bound by assiciated peripheral surfaces of the cutting head and the tool shank and mating in shape and dimensions. Each coupling portion has a base surface, a torque transmission wall and a fixation wall, the fixation wall of each cutting head coupling portion having an angular extension smaller than a corresponding angular distance between adjacent extremities of the fixation walls of two different tool shank coupling portions.

Abstract: A throwaway drill capable of machining a workpiece stably in a balanced manner even under high-efficiency, high-load conditions and capable of disposing of chips efficiently and smoothly. The drill carries an outer insert and an inner insert. As shown, each insert has a plurality of cutting edges each having a curved crest, a first slope, and a second slope which is at least partially a curved line. The inner and outer inserts are arranged so that the cutting area to be cut by the outer insert alone is partially cut by a cutting edge portion of the inner insert near its corner, and the cutting area which to be cut by the inner insert alone is partially cut by the crest of one cutting edge of the outer insert.

Abstract: Using a standard ice auger having a central shaft, a spiral flighting affixed thereon, and an ice cutting blade at the lower end of the flighting, a cylindrical ice hole is bored through an ice sheet. The inventive apparatus, mounted adjacent a lower portion of the standard ice auger, is then used to form an inverted funnel-shaped area at the lower end of the cylindrical ice hole. The inventive apparatus includes a bracket mounted to the ice auger and an ice hole flaring blade pivotally mounted to the bracket. A spring biases the ice hole flaring blade toward a transport position wherein the blade has its free end extending toward an upper end of the ice auger. The ice hole flaring blade is pivotable to an operable position wherein the blade is aligned generally below the ice cutting blade of the auger and has its free end extending downwardly and outwardly from the central shaft of the ice auger.

Abstract: A tool for cutting machining comprises a tool body, a cutting member and a fastener for fastening the cutting member to the tool body. The tool body has a shank, a central bore formed therethrough, and a front surface having grooves formed therein. The cutting member includes a cemented carbide body having a cutting edge formed in a front surface thereof, and a rear supporting surface. The supporting surface includes ridges received in the grooves, and a rearwardly open blind hole. The fastener extends through the central bore and is threadedly connected to the blind threadedly connected to the blind bore for pulling the cutting member against the tool body.

Abstract: A rotary tool for drilling and chamfering, which takes place in one common advance, essentially comprises a base body, a drill clamped centered therein and a chamfering tool disposed on the end of the base body toward the drill tip and having a cutter body tip disposed next to the flank of the lateral free face of the drill. The chamfering tool can be radially adjusted in relation to the drill in a direction pointing at right angles in respect to the drill axis.

Abstract: A drill including a cutter member and a shank which are formed separately from each other and fixed to each other for rotation as a unit, wherein the shank has an engaging groove formed in a distal end face thereof such that the engaging groove extends in an axial direction of the shank and is aligned with a center of the distal end face, and the cutter member consists of a rectangular plate including a proximal end portion fixed to the shank by engagement thereof with the engaging groove, and a distal end portion which is remote from the shank and which has at least one cutting edge.

Abstract: An adjustable reamer includes a securing portion, a shank, a guide members, at least one cutting insert, an adjustment device for adjusting the insert, and a clamp for clamping the insert. The clamp is releasable from the shank. A first place of contact is created between the clamp and the shank, and a second place of contact is created between the clamp and the cutting insert. An angle between the first and second places of contact in relation to the rotational axis of the reamer is at least 100.degree., preferably larger than 135.degree..

Abstract: A chip removal tool for finishing the radial surface of a bore and having a cylindrical bit for mounting a cutting element and a deflector positioned adjacent the cutting element to deflect chips cut from the bore and urging the chips into a flow of fluid from respective cooling and lubricating sources.

Abstract: A drill with a drill point part that contains the drill cutter and is made of a solid hard material. The drill point part is replacably attached to the end face of a drill shaft. The drill shaft is penetrated by a shaft groove which extends in an axial direction of the shaft to accomodate the drill point part and can center the drill point part in the groove region. The drill shaft has grooves on its periphery which run in the axial direction and extend into the region of the shaft groove and continue into the region of the drill point part. The drill point part can be clamped on its side faces corresponding to and opposite the groove flanks in a force-locking manner by an insertion-clamping fit in the shaft groove.

Abstract: A drill comprising, a central cutting edge tip which is arranged on an axial portion of a distal end of a spindle body, and a peripheral cutting edge tip which is arranged on an outer peripheral portion of the distal end of the spindle body, each of the tips including a tip body, the central cutting edge tip being arranged so that its longitudinal direction is parallel with a radius direction of the spindle body, a long-side cutting edge and a long-side corner cutting edge adjacent to an axial side of the long-side cutting edge being formed as an end cutting edge, and the short-side corner cutting edge adjacent to the long-side corner cutting edge being arranged so as to go beyond the axis of the spindle body, the peripheral cutting edge tip being arranged so that its longitudinal direction is parallel with a radius direction of the spindle body, the short-side cutting edge and the short-side corner cutting edge adjacent to an outer peripheral side of the short-side cutting edge being 9 formed as an end cutti

Abstract: A drilling tool, in particular a drill, has replaceable cutting elements that form the cutting edges, and chip-removing flutes. A chip shaping area (22) at least partially made of a more wear-resistant material than the drill body itself is arranged next to the faces (11) of the main cutting edges (5) approximately in the chip flow direction. In another embodiment, the chip shaping area if made of the same material as the drill body and is subjected to a subsequent local hardening process that makes it wear-resistant.

Abstract: A metal cutting tool includes a tool body rotatable about a center axis and a tool tip mounted on a front surface of said tool body for performing a cutting operation. A draw bar mounted axially in the tool body draws a rear surface of the tool tip toward the front surface of the tool body. Those front and rear surfaces include radial projections and radial recesses receiving the projections. The projections are wedgingly connected in the recesses to transmit all axial and rotational forces between the tool body and tool tip.

Abstract: A two-fluted countersink tool for countersinking holes comprising a holder and removable cutting inserts. The cutting holder having a body with two portions removed to define a first and second pocket. Each insert has first and second ends, first and second lateral surfaces, first, second and third top surfaces and a bottom surface. The cutting surface of each cutting insert extends from an edge of the third top surface. The cutting surface has a first cutting edge and a second cutting edge.The cutting inserts are positioned inside the pockets and are attached to the holder such that the cutting edge remains as close as possible to the centerline of the countersink tool.

Abstract: A boring bar includes an insert pocket formed on the back side of a relief in the working end of the bar, for the removable installation of a cutting insert therein. The insert pocket may be formed to provide a positive rake angle for the insert installed therein, relative to the axis of the bar, and further may include a positive angle relative to the radius of the bar as well. The force imparted to the insert as the bar is forced against the workpiece, tends to force the insert upwardly and inwardly into the pocket of the bar, thus assisting in holding and securing the insert to the bar. The bar is also thicker at the upper portion of the insert pocket than at the lower portion of the pocket, thus providing additional strength and stiffness to the bar in this critical area to reduce the possibility of chatter and breakage of the bar. Either the tool moves and the workpiece is stationary, or the workpiece moves and the tool is stationary.

Abstract: A drill including a substantially columnar tool body having an axis. The tool body includes a pair of chip ejection grooves formed in an outer peripheral surface thereof. The tool body further includes, in a distal end portion thereof, a pair of cutting edges provided at respective distal ends of the pair of chip ejection grooves and a recess communicating with the pair of chip ejection grooves. The pair of cutting edges have radially inner ends located in positions slightly offset from the axis radially outward, and the recess extends along the axis while passing a gap between the radially inner ends of the pair of cutting edges, and has a bottom surface facing a distal end of the tool body. The bottom surface of the recess includes one slope and another slope.

Abstract: A self-calibrating countersink tool includes a reusable insert-holder with an axis-defining shank portion and an insert-receiving notch disposed at one end of the holder. The tool also includes at least one selectively attachable insert which is sized and shaped to be received within the insert-receiving notch of the holder. Each disposable insert includes a tapered cutting-edge portion and a notch-mating portion which is complementary in shape to the insert-receiving notch. When the insert is in mating engagement with the holder, the cutting-edge of the insert is disposed forwardly of the holder and defines an angle of between about 105 and 165 degrees relative to the holder axis. The countersink tool also includes an affixation means for affixing a disposable insert to the holder such that the insert is in mating engagement with the insert-receiving notch.

Abstract: This invention discloses an improved cutting tool such as a counterbore cutter or piloted reamer that is comprised of a free-spinning pilot connected to the cutting tool. The free-spinning pilot allows the cutting tool to rotate within it while it makes firm contact with a pre-drilled hole in material to be cut improving the location of the cutter relative to the hole.

Abstract: A drilling tool for drilling in metals has in its front part cutting insert-carrying cartridges, for instance 3, 5 or 7 in number. The peripheral cartridge (6) carries a peripheral cutting insert (7). This peripheral cartridge is fastened in the drill by a locking screw (16) that extends in a slot (17) in the drillhead. Radially inside of the peripheral cartridge is a wedge (15) which can be displaced axially and thereby regulate the radial position of the peripheral cartridge and cutting insert and, thereby, the cutting diameter. When the desired radial adjustment has been attained, the peripheral cutting insert is fixed by the locking screw (16). In this way, a very exact adjustment of the cutting diameter is obtained.

Abstract: A metal cutting drill with replaceable cutting inserts and a length to diameter ratio of four to one or more. Two cutting inserts are positioned in exactly opposed diametric positions, and engage the workpiece in a substantially identical manner to precisely balance the radial forces resulting from drill axially advancing though a workpiece. Through the use of dual cutting inserts, the drill cuts the full circumference of a bore with each one-half revolution and therefore achieves the a faster axial feed rate. By virtue of the inserts being triangular, the curved corners on the cutting edges of the two inserts may be positioned relatively close together and yet sufficient space is left between the inserts to enable the drill shank between the inserts to be relatively thick and strong even at increased length to diameter ratios.

Abstract: The invention pertains to a drilling tool for drilling in solid metal. It comprises a base body with flutes for chip removal and two interchangeable inserts (1) designed especially as reset bits, having the same shape and size and being arranged in a recess at the end of a flute at the front of the base body. The inserts (1) are situated at different radial distances from the drilling tool axis (30) with overlapping work ranges. The blade (4,4a) of the insert (1) is formed by two cutting edges (10, 10a) and (14, 14a) which together form an obtuse point angle (18). The insert (1) is characterized by an extended form in its longitudinal direction L with channel-like troughing of its faces (3) running essentially in the longitudinal direction and by an arrangement of the blades (4,4a) at the channel ends. Furthermore, the channel has a base surface (9) which with its longer parallelogram sides (6,7) forms an acute angle (8) with the longitudinal axis (2) of the insert (1).

Abstract: A reamer for precision machining of holes includes a reamer body and a knife plate supported above the exterior of the body and extending along the exterior. The knife plate has a front lower radial height cutting region and a rear taller radial height cutting region joined by an inclined step so that the first front region does the major cutting and the second rearward region does the finer machining. The front cutting region has an entrance bevel. The inclined flank shapes of the cutting regions are disclosed. Reamer guide strips supported along the support have a similarly shaped bevel and step as the knife plate.

Abstract: An inflatable gas pipeline stopper is used for stopping gas flow through pipelines to permit repairs to be made to gas pipelines. For plastic gas pipelines, a tapping tee is attached to the plastic gas pipeline and a gas tight apparatus having a valve is attached to the tee. Thereafter, the plastic gas pipeline can be cut with a pipe cutter that is engaged with a hexagonal head and magnetic attachment to be operated from the exterior of the air tight apparatus. The pipe cutter can be removed from the air tight apparatus and the valve of the air tight apparatus closed to prevent gas from escaping from the pipeline. The inflatable gas pipeline stopper with dual air bags can then be inserted into the plastic gas main, through the air tight apparatus and the tee, to stop the flow of gas through the pipeline. After repairs on the pipeline are complete, the inflatable gas pipeline stopper can be removed, the tee can be stopped, and the air tight apparatus can be removed.

Abstract: The invention relates to a drilling tool (11), comprising a drill shank (22) which has an inner chip space (13) and an outer chip space (14) which extend axially along the drill shank (22) and which in each case accommodate at least one indexable insert (21, 22), the drill shank (12) having a left-hand twist for damping vibrations and increasing the cutting capacity.

Abstract: Reamers, when operated with large amounts of material removed and at high reaming speeds, encounter difficulties when they ream in material in which permanent structural changes occur on the application of heat and subsequent rapid cooling. These difficulties are avoided in that the transition region between the main cutting edge and the minor cutting edge follows a constantly curved path at least one end region of which runs tangentially to at least the minor cutting edge.

Abstract: A deburring tool comprising a barrel having a blade slot integrally formed in its top end and a blade having an aperture disposed therethrough freely positioned within the blade slot. A blade axle aperture is disposed through the barrel and the blade slot. The blade axle is positioned within the blade axle aperture and through the blade aperture in order to secure the blade within the blade slot. A resilient positioning member aperture is integrally formed in the bottom end of the barrel for receiving the resilient positioning member. The resilient positioning member maintains contact with the blade and exerts an outward force against it. The blade is able to retract if forced but will immediately extend outward due to the resilient positioning member as soon as any opposing forces dissipate.

Abstract: A drilling tool having an elongated body with a longitudinal axis and provided with at least one insert receiving pocket and an indexable cutting insert for use with the drilling tool for performing drilling action is disclosed. The insert of the drilling tool includes a rake face, relief flank faces, a base, a plurality of cutting edges, each defined between the rake face and adjacent relief flank face and included between two adjacent cutting corners. Each cutting edge has at least one set of component cutting edges, each set having two pairs of component cutting edges merging in a common point, each pair comprising a first and a second component cutting edge merging via a bridging section directed towards a central line constituting or parallel to a median line of the insert and passing through the common point.

Abstract: A tungsten carbide boring bar has a mechanism for securing the cutter insert in a passage in the boring bar. The boring bar has a transverse bore through the body of the tool. A steel plug is received in the bore closely adjacent the position of the insert. The plug has a central threaded passage. A retainer is threadably received in the plug and has an inner end seated in a notch in the shank of the insert to retain the tool in position, and an outer end adapted to receive a turning tool.

Abstract: A drill including a bit having an extension received in and axially extending groove formed in the end face of the drill base body, a side cutting edge projecting beyond the base body circumference, and two active end cutting edges projecting beyond the end face of the base body, with the drill further including clamping elements for securing the bit extension in the base body groove with a possibility of radial adjustment.

Abstract: A drill for drilling in metal with improved performance in the smaller diameter range. The drill comprises a drill shaft, the front end of which is provided with radially outer and radially inner inserts, each insert having elongated rhomboidic shape, in which each of the short sides is broken at its middle to form a V-shape having an internal obtuse angle. The inserts are arranged such that the longitudinal axis of the radially outer insert is inclined at an angle from the longitudinal axis that is different from the angle of inclination between the longitudinal axis of the radially inner insert and the longitudinal axis of the drill.

Abstract: A drill includes a substantially cylindrical holder (10) with a longitudinal axis (X) and a transverse axis (Y) perpendicular thereto, a drill tip (12) in which there is a groove (14) running along the transverse axis (Y) with a groove bottom (16) and groove sides (18',18"), and a cutting insert fitted in the groove having two main cuts (26',26") with forwardly adjacent cutting surfaces (32',32") and two rear surfaces (30',30") opposite a cutting surface on the other side of the transverse axis (Y). The holder has two bores (20',20") in a radial plane (R) of the drill, each of which is in the region of a rear surface (30',30") of the insert (25) and opens into a groove side (18',18"). The longitudinal axes (24',24") of the drillings (20',20") run at an acute angle to the groove side (18',18") and the adjacent rear surface (30',30") of the insert (25).

Abstract: A cutting insert having a cutting head and a coupling shank integral at one end thereof with the cutting head and including a screw threaded portion. The cutting insert is formed by a powder metallurgy process of compacting and sintering and the screw threaded portion is constituted by a substantially cylindrical body having a pair of diametrically opposed, longitudinally truncated planar portions interposed between substantially curved cylindrical portions having arcuate surfaces on which there are formed a non-continuous screw thread, the arcuate surfaces extending between 50 to 85% of the total peripheral extent of the cylindrical body of which they form part. There is also disclosed a powder metallurgy process for manufacturing the cutting insert.