Abstract: A tool for chip removing machining includes a holder and a cutting insert clamped within a pocket of the holder. The pocket has upper and lower sides, and the cutting insert comprises an upper surface and a lower surface. The upper side of the pocket and the upper surface of the cutting insert comprise first cooperating contact surfaces defining a first flank angle. The lower side of the pocket and the lower surface of the cutting insert comprise second cooperating contact surfaces which define a second flank angle. The first flank angle is larger than the second flank angle. The lower surface of the cutting insert and the lower side of the pocket form intermeshing projections and recesses which define the second contact surfaces.

Abstract: A holding device for machine tool inserts includes a recess delimited by clamping jaws. The recess serves as a clamping seat for the insert. The holding device also includes a slot extending the recess and having a receptacle for a spreading body of a spreader key. The slot has a half-circular expansion on one of its edges serving as a receptacle for the spreading body. The cross section of the spreading body of the spreader key is a polygon outline in the shape of an isosceles triangle whose corners are each rounded with an equal radius of curvature.

Abstract: A cutting insert clamping mechanism for use in a cutting tool. The cutting tool has a body portion and a clamping portion. The clamping portion includes a base jaw and a clamping jaw. The clamping jaw has on its lower side a forward clamping surface separated by a recess from a rearward clamping surface. A first narrow bridge section connects the clamping jaw to the body portion of the cutting tool. A second narrow bridge section extends generally towards the rearward clamping surface. As a result of the two narrow bridge sections, the forward and rearward clamping surfaces can resiliently bend independently, and thereby are capable of applying independent clamping forces to the insert.

Abstract: A toolholder (1) for clamping a cutting insert (6), the toolholder including a rigid base jaw (2), an upper clamping jaw (3) defining with the base jaw a longitudinally extending insert receiving slot for releasably receiving the cutting insert in a predetermined position, the upper clamping jaw tapering towards a leading nose portion (12) so shaped and dimensioned to initially urge the cutting insert to the predetermined position prior to its clamping in the insert receiving slot.

Abstract: A toolholder for holding a cutting insert, particularly for grooving and/or parting operations. The toolholder comprises a base and a clamping arm forming therebetween a pocket and a slot. The pocket is open at a front end thereof for receiving the cutting insert, and the slot extends rearwardly from a rear end of the pocket. A fastening screw extends through the slot from the clamping arm to the base for displacing the clamping arm toward the base in order to clamp the cutting insert within the pocket. A spacer is disposed in the slot for limiting an extent of movement of the clamping arm toward the base, thereby preventing overclamping of the clamping arm.

Abstract: A holder for free-cutting machining tool inserts, especially for chiseling, piercing or cutting inserts, includes an essentially beam-like edge support (1) with a receiving pocket (5) constructed in its end for the blade edge inserts. Clamping jaws (9 and 11) define the narrow width of the receiving pocket (5). A slot (29) is configured in the blade edge support (1) forming a flexible pivot for moving one clamping jaw. An operating member (37) is provided for producing a clamping force in the area of the slot (29) on the movable clamping jaw (11). The operating member (37) is mounted in a bore (39) at some distance from the slot (29). The clamping force is transmitted to the movable clamping jaw (11) through a force transmission member (43) which is slidably guided in the blade edge support (1).

Abstract: This invention relates to slot milling tools and the like where a number of inserts (4) are detachably mounted at the periphery of a disc shaped carrier means (1). The seats (3) of the inserts are arranged within integral holding projections arranged and shaped relatively to the intended positions to the inserts that on operation the radial component of the cutting force biases the holding force acting against the insert so that it increases on increase of cutting force. This is achieved by arranging at the essentially radially projections (7) an obliquely located nose portion (8) engaging the insert.

Abstract: A blade-shaped tool holder for metal cutting machining comprises a blade part formed of a first metallic material, and a core of a sub micron hard material disposed in the blade part for stiffening the blade part.

Abstract: A tool holder is provided for retaining a cutting tool which can be pivotally adjusted to align the cutting tool and provide a precise cut. The tool holder body has an area of reduced cross-section which serves as a fulcrum about which the cutting tool is pivotable. The tool holder body has a forward tool end for retaining a cutting tool and a rearward end operative to be mounted or retained on a lathe or other machine tool. The forward tool end can be pivotally adjusted about the fulcrum to align the cutting tool and provide an accurate, straight cut into a workpiece. A lever arm attached to the cutting tool end is adjustable to cause pivotal movement of the cutting tool by displacing the tool end laterally in response to the force of the lever arm when it is drawn toward or away from the tool holder body.

Abstract: A tool for chip-removing machining includes an insert holder and an insert that is mechanically connected with the holder via upper and lower interfaces. Each interface includes a pair of contact surfaces that extend at an obtuse angle relative to each other. Disposed centrally between one of those pairs of contact surfaces is a ridge, and disposed centrally between the other pair of contact surfaces there is a flute. Each of the recess and flute is defined by side surfaces that extend at an acute angle relative to each other. When the ridge engages the flute, a proper absorption of transverse forces acting upon the insert is guaranteed, whereby the insert is maintained essentially immovable in its position in order to guarantee a proper machining accuracy.

Abstract: A slot-widening key for use with insert holders of the kind that includes a blade shaped body having a slot intended to receive an insert. One surface of the slot is defined by an elastically flexible clamping arm for clamping the insert. The key has a shaft with two projections for engaging laterally opening seats in the body and the clamping arm, respectively. One of these two projections is provided on a pivoting link that is pivotably connected with the shaft via a hinge pin. The sum of a first distance between the hinge pin and one of projections, plus a second distance between the hinge pin and the other projection, is larger than the at-rest distance between the seats of the insert holder. Pivoting of the shaft beyond an unstable position of equilibrium thus makes the clamping arm deflect by a predetermined value for widening the slot. The key is self-supporting in the slot-widening position and does not require that the manual force be continuously applied.

Abstract: A toolholder for holding a cutting insert, particularly for grooving and/or parting operations. The toolholder comprises a base and a clamping arm forming between one another a pocket and a slot. The pocket is open at a front end thereof for receiving the cutting insert, and the slot extends rearwardly from a rear end of the pocket. A fastening screw extends through the slot from the clamping arm to the base for displacing the clamping arm toward the base in order to clamp the cutting insert within the pocket. A stop is provided for limiting an extent of movement of the clamping arm away from the base, for defining a maximum height of the pocket.

Abstract: A metal-cutting tool comprises a holder, a clamp, and a metal-cutting insert. The holder includes a blade part which forms an upwardly facing seating surface extending in a front-to-rear direction. The holder includes a recess including a longitudinal axis extending in the front-to-rear direction at an angle relative to the seating surface, whereby an imaginary rearward extension of the seating surface converges toward the axis. The insert is mounted on the seating surface and the clamp has a rear portion which is slidable within the recess, whereby a front portion of the clamp pushes downwardly and rearwardly against a top surface of the insert. That top surface is shaped so that the front portion of the clamp is flexed upwardly relative to the rear portion when the rear portion is pushed rearwardly to the clamping position.

Abstract: An insert holder having a slot adapted to receive a cutting insert, a part of the slot being formed by a clamping arm. Two laterally opening seats are provided in the holder for receiving two spaced-apart projections of a key that is intended to bend the clamping arm outwards for widening the slot during the mounting and/or dismounting of a cutting insert. One of the seats has a cylindrical shape and defines a fulcrum for receiving the first projection, while the other seat has an oblong shape in order to effect outward bending of the clamping arm in response to displacement of the second projection along the oblong seat from a first point thereon located at a certain distance from the first fulcrum to a second point thereon located at a shorter distance from the fulcrum.

Abstract: A holder for clamping an insert, such as an insert for the turning of grooves and for parting. The holder includes a slot for receiving the insert. A recess is formed in an upper surface of the slot, and a tensioning roller is rotatably mounted in the recess. The roller is rotatable between a position permitting insertion or removal of the insert, and a position clamping the insert in place.

Abstract: A cutting insert and toolholder for metalworking operations in which the insert is mechanically captured by a resilient clamping arm within a recess of the toolholder secured at three distinct locations. In one embodiment, a clamping arm resiliently secures the insert within the toolholder while in another embodiment a clamping arm is positively displaced to secure the insert within the toolholder.

Abstract: A slot opening key having a body member provided with a first, planar abutment surface and a second surface recessed with respect to the first surface and co-directional therewith. The body member is provided with a pair of spaced-apart prongs which are substantially parallel to one another. The first prong protrudes from the first surface, and the second prong is positioned such that it is spaced apart from the first prong by at least a portion of the second surface. A prong rotating lever is provided to eccentrically rotate one prong relative to the other to adjust the spacing therebetween. The slot opening key is used to facilitate removal and insertion of a cutting insert retained between a resilient clamping jaw and a rigid base jaw, by inserting the prongs into corresponding apertures in each jaw, and actuating the rotating lever. The second surface between the first and second prongs provides clearance so that the key body remains clear of the insert during insertion and removal.

Abstract: A tool holder in which a clamping element is integral with the tool body and movable into clamping and unclamping positions by simple screw or other adjustment. In one embodiment the tool holder comprises an elongated metal body having a mounting portion adapted for attachment to a machine and a forward end operative to retain a cutting tool thereon. The forward end includes an elongated clamping element integral with the body and space therefrom to provide a recess into which a tool bit is insertable. A set screw or other actuating element is cooperative with a portion of the elongated element and the body to cause flecture of the web portion and movement of the elongated element toward the confronting surface of the body to clamp a tool bit into position.

Abstract: A cutting insert (2) having a tip bit. (5) and a tabular tip body (4) supporting the tip. The cutting insert (2) is used by being mounted to the body (1) of a cutting tool. Wherein, the tip body (4) has a plurality of elastic deformation sections (8) separated by a slit (6) which extends on a transverse line from a corner to an area near another corner. The elastic deformation sections are moved closer together and elastically deformed within a plane which includes the tip body 4 when being mounted to the tool body 1. And, the opposing faces of the elastic deformation sections (8) have engaging sections (10) for engaging the tip bit (5).

Abstract: A cutting tool assembly comprises a tool shank having a shank holding portion and an exchangeable adaptor. The adaptor has an adaptor mounting portion to be secured to the shank holding portion with clamping means, and an insert retaining portion for retaining a replaceable cutting insert, the insert retaining portion projecting outwardly from the adaptor mounting portion. The adaptor mounting portion has a side wall formed with a protrusion which has a protrusion abutting surface substantially parallel to the side wall. The shank holding portion has a face surface generally parallel to the side wall of the adaptor mounting portion and formed with a recess mating with and capable of receiving the protrusion of the adaptor mounting portion. The clamping means comprises an adaptor through bore formed adjacent a rear end of the adaptor and passing through the protrusion, a threaded bore formed in the shank holding portion and aligned with the adaptor through bore, and a clamping screw.

Abstract: A cutting tool assembly (1) clamping mechanism (5) which secures a cutting insert (3) for performing cutoff, grooving, slotting, and profiling operations. The clamping mechanism (5) has resilient upper and lower clamping jaws (7, 9) for receiving and securing the insert (3). The cutting insert (3) has front and top faces (13, 15) that define a cutting edge (21) at an intersection thereof, a back face (25), and adjacent proximal and distal bottom faces (27, 29) contiguous with said front and back faces (13, 25) that define an angular lower seating portion (30). The lower clamping jaw (9) of the clamping mechanism (5) includes proximal and distal pocket surfaces (59, 67) forming an angularly recessed jaw portion that is complementary in shape to the angular seating portion (30) of the insert (3).

Abstract: A holder assembly for a chip-removal tool insert has a holder member formed with two clamping jaws which are spaced apart and form an elongated slot there between, the slot is provided with an enlarged opening formed between curved surfaces on opposite inner faces of the jaws, the opening receives an expansion key rotatable in the slot for a further displacement of the jaws from each other during insertion of the chip removal tool in the slot.

Abstract: A metal cutting tool assembly comprising a rigid holder blade, an insert receiving slot formed in a leading end of the holder blade and defined between a resiliently displaceable clamping jaw formed integrally with the holder blade and rigid base jaw forming part of the holder blade, spaced apart displacement and supporting surfaces respectively formed in or on the clamping jaw and the holder, and a slot opening key, a pair of spaced apart projecting prongs of the key with adapted to engage the surfaces. At least one of the prongs is displaceable with respect to the holder blade so as resiliently to displace the clamping jaw outwardly with respect to the base jaw into an opening position for insertion or removal of an insert.

Abstract: A blade-type holder for a cutting insert includes a blade body having front and rear slots. The front slot is closed at its rear end and open at its front end for receiving a cutting insert. The rear slot has a closed front end spaced rearwardly of the closed rear end of the front slot so that a portion of the blade body disposed between those closed ends defines a spring hinge. The spring hinge interconnects a base and camping portion of the blade body. The base portion is disposed below the slots, and the clamping portion is disposed above the slot. An operator employs a tool to manually apply a downward force to the clamping portion at location rearwardly of the spring hinge to cause the front end of the clamping portion to swing upwardly about the spring hinge, to widen the front slot. After a cutting insert has been replaced, the manual force is released, whereupon the front end is swung downwardly into clamping engagement with the cutting insert by the restoring force of the spring hinge.

Abstract: A metal removing tool, in particular lancing insert, has a holder (10) with a slot-shaped recess (11) and a cutting insert (12) detachably held therein under a prestress by means of an elastically expandable clamping arm (101) designed as one side of the recess (11). The opposite cooperating insertion and bearing surfaces of the cutting insert (12) and slot-shaped recess (11) have a V-shaped cross-section. At its insertion and bearing surface facing the clamping arm (101), the cutting insert has a plurality of substantially flat partial surfaces (124, 125, 126) arranged behind each other in the insertion direction. Two surfaces enclose an obtuse angle .alpha. and form a salient point at the ridge (127), so that the clamping arm (101) engages the cutting insert (12) between the ridge (127) and the cutting edge (121) in the clamping state.

Abstract: A metal cutting tool assembly comprising a rigid holder blade, an insert receiving slot formed in a leading end of the holder blade and defined between a resiliently displaceable clamping jaw formed integrally with the holder blade and rigid base jaw forming part of the holder blade, spaced apart displacement and supporting surfaces respectively formed in or on the clamping jaw and the holder, and a slot opening key, with a pair of spaced apart projecting prongs of the key adapted to engage the surfaces. At least one of the prongs is displaceable with respect to the holder blade so as resiliently to displace the clamping jaw outwardly with respect to the base jaw into an opening position for insertion or removal of an insert.

Abstract: A holder blade is provided which includes an elongated member including an insert cavity for securing an insert in place. The insert cavity includes opposing surfaces which include V-shaped lengths which engage corresponding V-shaped lengths provided in opposite surfaces of the insert. A camming action is provided so that the opposing surfaces of the insert cavity may tightly grip the insert.

Abstract: A cut-of tool comprises a thin holder plate of steel, and a cutting insert of cemented carbide. The holder plate has an outwardly opening, insert-receiving recess defined by a bottom wall, an inner wall and an upper wail which is part of an elastically movable clamping arm serving to retain the insert in the recess. The insert has both upper and lower grooves of V-shaped cross-section, which are adapted to cooperate with corresponding V-shaped ridges associated with the recess. Between the insert and the bottom wall of the recess, there is provided a dismountable spacer element of cemented carbide, which has on its upper side a V-ridge for engaging a corresponding V-groove in the underside of the insert. The spacer element is maintained in place, on the one hand, by a countersunk connecting device in the area of the outer end of the bottom wail and, on the other hand, by a male-female connection between the inner wall of the recess and a rear end of the element.

Abstract: A cutter blade (17) for a finger joint cutter head (10) which includes a cantilevered cutting tip attachment. A cantilever pocket (20) is formed in the fillet area of steel backing member (18) to receive and hold the inner end of a hard material cutting tip (19), such as tungsten carbide. Cantilever pocket (20) has tapered sides which diverge outwardly and a rounded vertex or pocket bottom. Cutter tips are elongated to extend well into cantilever pockets (20). Each cutter tip is attached within a pocket (20) and along the joint surface of steel backing members (18), using a sandwich braze, to form braze joints (21) and (22).

Abstract: A cut-off tool includes a plate-like holder and a cutting insert retained by a clamping arm. The insert has on its underside a V-shaped groove cooperating with a ridge of analogous V-shape on the holder plate. The V-groove has two flank surfaces extending at an obtuse angle to each other. The male edge or V-ridge similarly has two flank sides, each of which is broken by a break line so as to form two part surfaces, the inner part surfaces, located closest to the central portion of the V-ridge, enclosing an obtuse angle which is, on the one hand, greater than the corresponding obtuse angle between the outer two part surfaces and, on the other hand, smaller than the obtuse angle between the flank surfaces of the V-groove.

Abstract: A cutting tool for parting and grooving operations comprises a shaft and a clamp body releasably secured to the front end of the shaft. The clamp body carries a cutting insert clamped between a pair of clamp arms. The clamp body includes first and second blade portions oriented at a right angle to one another. The first blade portion is adapted to be secured to one outer surface of the shaft, whereas the second blade portion is adapted to be secured to a second outer surface of the shaft.

Abstract: A parting or grooving tool includes a narrow support blade and a cutting insert removably securable in a recess formed by upper and lower jaws at the front portion of the blade. The inert is clamped into place by an actuator which engages in a slot that extends at an angle in relation to the longitudinal axis of the recess such that the lower jaw is subjected to an elastic bending of such nature that a downwardly directed clamping force is exerted towards the upper surface of the cutting insert.

Abstract: A parting or grooving tool includes a narrow support blade and a cutting insert removably securable in a recess formed by upper and lower jaws at the front portion of the blade. The inert is clamped into place by an actuator which engages in a slot that extends at an angle in relation to the longitudinal axis of the recess such that the lower jaw is subjected to an elastic bending of such nature that a downwardly directed clamping force is exerted towards the upper surface of the cutting insert.

Abstract: The invention is directed to a cutting tool with a cutter bit or a carving insert, which is held exchangeably in a one-piece tool support and lies in contact with opposite jaws of the tool support that form a clamping gap, with prismatic clamping surfaces disposed in common with those of the jaws and with at least one clamping element, such as a tightening screw for narrowing the clamping gap and with at least one separately formed clamping surface section, which, with respect to the direction of the clamping force initiated by the manipulated tightening screw, runs obliquely in such a manner, that a component of force, which is directed towards the open end of the clamping gap, acts upon the cutter bit.

Abstract: A cutting insert comprising a central body portion having a longitudinal plane of symmetry, a pair of oppositely directed end portions formed integrally with said body portion and being respectively formed with rake and flank surfaces and with first and second cutting edges of substantially equal width, the flank surfaces of each end portion tapering by amounts and in directions such as to provide clearance between the flank surfaces and the side walls of the groove being cut, a normal to the midpoint of said first cutting edge being inclined, in a first sense, with respect to said plane of symmetry, by an angle .alpha. and a normal to the midpoint of said second cutting edge being inclined in a second and opposite sense with respect to said plane of symmetry by an angle .alpha., whereby said edges are inclined with respect to each other by an angle 2.alpha..

Abstract: A drill bit has a throw-away drill bit tip in the form of an insert (21, 31) secured to a shank (22, 32) to be mounted in a drilling tool. The insert (21, 31) is disengageably mechanically connected with the shank (22, 32) without any screws. At least a cutting edge of the insert (21, 31) is made of a diamond or cubic boron nitride sintered body, and the shank (22, 32) is made of steel. Due to this structure, the insert (21, 31) has an excellent wear resistance and an adhesion resistance. The shank (22, 32) has sufficient toughness against breakage. Such a drill bit does not require any resharpening for continuous use during bit life.

Abstract: A drill bit has a throw-away drill bit tip in the form of an insert (21, 31) secured to a shank (22, 32) to be mounted in a drilling tool. The insert (21, 31) is disengageably mechanically connected to the shank (22, 32) without any screws. The insert (21, 31) is formed of a silicon carbide whisker reinforced alumina sintered body, and the shank (22, 32) is made of steel. Due to this structure, the insert (21, 31) has an excellent wear resistance and an adhesion resistance. The shank (22, 32) has a sufficient toughness against breakage. Such a drill bit does not require any resharpening for continuous use during bit life.

Abstract: A cutting insert for use in a cutting tool assembly comprising first and second longitudinally directed insert surfaces directed at an acute angle with respect to each other and defining between them a centrally disposed, wedge-shaped body portion of the insert; a leading end portion of the insert formed integrally with a wider end portion of the wedge-shaped body portion and formed with a cutting edge and with an abutment shoulder located between the cutting edge and an adjacent end of said first insert surface and a trailing end portion of the insert formed integrally with a narrower end portion of the wedge-shaped body portion and defined between a wholly recessed extension of said first insert surface and said second insert surface.

Abstract: A drill bit of a diamond-coated sintered body has a substrate mainly composed of Si.sub.3 N.sub.4 or SiC. At least a wear portion of the bit is coated with a diamond layer. If the bit is of the throw-away kind, an insert is removably secured to a shank. At least the insert or a wear portion thereof is coated with a diamond layer. The sintered body contains a prescribed amount of a sintering assistant or aid selected from MgO, Y.sub.2 O.sub.3 and the like. The diamond coating layer has a thickness of at least 0.1 .mu.m.

Abstract: A metal cutting tool assembly comprising a tool block; a substantially planar adaptor to be screw-clamped to the tool block; first and second insert clamping jaws formed integrally with the adaptor and defining between them an insert receiving slot for receiving a cutting insert; a relatively narrow neck portion formed integrally with the adaptor and serving to couple the first jaw with the remainder of the adaptor and screw coupling means for clamping the adaptor to the tool block; the screw coupling means including aligned screw receiving bores formed respectively in the adaptor and the block and so directed that screw insertion of a clamping screw into the aligned bores effectively clamps the adaptor against the tool block and, at the same time, exerts a resultant force on a first jaw so as to pivot it about the neck portion into effectively clamping the insert against the second jaw.

Abstract: A metal-cutting insert for performing cut-off and grooving operations and of the so-called self-gripping type. The insert comprises a front end with a cutting edge, first and second elongated straight grippable surfaces extending in converging relationship rearwardly from the front end and a rear end defined by first and second straight surfaces of approximately equal length that intersect each other in an included obtuse angle. The grippable surfaces each have a concave transverse contour. The first and second end surfaces extend respectively from the first and second grippable surfaces and intersect at a location to coincide with the intersection of a rear locating surface and a key-receiving aperture of a support blade when the insert is fully received within the support blade recess.

Abstract: An elongated tool block for use in metal grooving, parting, turning or boring operations and being of the kind consisting of two component blocks which, when screw coupled together, also clamp a holder blade thereto, one of the blocks being formed with an elongated edge surface serving to delimit an outer longitudinal boundary of a holder blade retaining groove, and having an end portion and an intermediate portion; a relatively resilient coupling portion of this one block serving to couple the end and intermediate portions together; there being furthermore provided first screw coupling means for screw coupling the component blocks together at the intermediate portion and second screw coupling means for screw coupling the component blocks together at the end portion.

Abstract: A cutting tool assembly wherein a replaceable cutting insert is clampingly held between a pair of clamping jaws of an insert holder which are respectively provided with pairs of clamping surfaces one pair of clamping surfaces being of uniformly curved cross-sectional shape, while the other pair of clamping surfaces being of non-uniformly curved cross-sectional shape; the arrangement being such that when the insert is clamped between the jaws the respective clamping surfaces contact each other along discrete, axially directed locations which are symmetrically disposed with respect to and axially spaced from a median plane of the insert.

Abstract: A rotary slot cutting tool having a flat sided disc shaped body with a central bore, a plurality of apertures spaced about the periphery of the body each aperture having in it a cutting insert held in position by the shape of the aperture against radial movement, each aperture being shaped in such a manner that on the application of a force acting radially outwards on the circumference on the bore of the body, faces of the aperture are caused to spread apart to permit removal and replacement of the inserts in an axial direction. The invention further provides an insert for use in rotary and other slot cutting tools.

Abstract: A throw away cutting tool comprising a holder formed with a wedge groove and a throw away insert having a cutting edge at one end thereof and a wedge portion at the other end, the wedge portion being adapted to be clamped in the wedge groove by elasticity of the material of the holder. The holder is at least partly made of cemented carbide for higher rigidity and cutting stability. Also, the radius of curvature at the deep end of the wedge groove is optimized for crack resistance. Further, the angle of the V-ridge on the holder is interrelated to the angle of the V-groove in the insert for more holding stability and crack resistance.

Abstract: A holder for cutting tool inserts, particularly for carving or cutter bits, with a gripper slot, which in each case holds these inserts and the opposite jaws of which have an oval slotted area, into which a prop-open key with an elliptical cross sectional profile can be inserted and turned. The oval slotted region is formed from two recesses, which lie opposite to one another each in a jaw and which run corresponding to the two smaller apical circles of curvature of the elliptical cross sectional profile and are at a distance from one another, the magnitude of which lies between the length of the larger axis of the ellipse and that of the smaller axis of the ellipse.

Abstract: A cutting insert for use in internal and external chamfering of pipe ends. The cutting insert is capable of ready and insertion and replacement in a metal cutting tool and can be held firmly in the tool holder in a predetermined position.

Abstract: A metal cutting insert of substantially polygonal shape having top, bottom, front, rear and side faces; a front cutting edge being formed at the intersection of the top and the front face and first and second side cutting edges formed respectively at the intersections of the top and the two side faces, chip forming means being located on the top face within an area defined by the cutting edges; the top and bottom faces being respectively of convex and concave disposition.

Abstract: A parting tool is provided having a tool shank and an interchangeable blade support connected thereto. The blade support is equipped with a blade attachment of blade. The blade support makes contact along one side thereof with a broad-side of the tool shank. The blade support has narrow sides which are guided, at least on sections, by two guide surfaces of the tool shank typically disposed on flanges. Flat contact surfaces on said flanges perpendicularly disposed in relation to the broad side of the tool shank butt against two corresponding counter guide surfaces on said blade support and are pressed against each other by clamping means such as longitudinally off-set screws. In comparison with earlier parting tools used for the same applications, the parting tools of the invention can be made smaller in overall height and provide extremely stable connection between the blade support and the tool shank, thereby greatly reducing rattling and vibrations during normal cutting operations.

Abstract: A metal cutting tool for turning, cutting off, grooving, chamfering and end facing operations. A cutting insert is clamped in a slot in a tool holder by a resiliently pivoting jaw. The tool and holder have complementary longitudinal keying ribs and grooves and a mating transverse projection and recess for resisting forces in both direction.