Abstract: A throwaway ball end mill comprising an end mill body and a tip pressed by a clamp screw onto a cutout formed at the forward end of the end mill body. The cutout is formed in a longitudinal direction with respect to the end mill body, and a pair of lateral regions forked by the cutout have opposite flat surfaces, the lateral regions have clamp holes formed in a direction making a right angle with the cutout, one clamp hole has a conical surface extending toward the periphery of the corresponding lateral region, and the other clamp hole has a female thread formed therein,the centerline of the conical surface is deviated from that of the clamp holes toward the base end of the end mill body. When the clamp screw is tightened with the tip inserted in the cutout, the tip is pressed against the end of the cutout accordingly, and at the same time one lateral region is bent toward the other lateral region.

Abstract: A depth-of-cut bushing is mounted above a cutter-arm array to provide a cutting head mounted on a rotary lawn mower or mower/trimmer. The bushing is shaped so that it acts together with the cutter-arm array to accomplish control of the cutting action. This control enables chipping of stumps or roots at the low horsepowers available with lawn mowers or mower/trimmers.

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 ball end mill and an insert for use in the cutting tool. The insert has a constant angle maintained along the entire clearance face.

Abstract: A removable cutterhead insert for use in a helical cutterhead for an industrial woodworking machine, the helical cutterhead including a generally cylindrical portion, a plurality of circumferential, spaced grooves extending into the cutterhead body from the periphery of the cylindrical portion and adapted to receive the removable cutterhead inserts, and fasteners for removably securing the cutterhead inserts in the grooves; the cutterhead insert includes a mild steel insert body and two blade units; the insert body having raised portions having triangular pockets formed therein so as to have two inwardly-facing flat portions, a hole to receive the fasteners for removably securing the cutterhead insert in the grooves between the inwardly-facing flat portions and two bolt holes to secure the two blade units to the insert body; and the blade units are triangular with cut-off corners each including a blade edge and configured so as not to occlude the countersunk hole and to have the blades edges disposed to align

Abstract: A blade assembly for a shredding machine is presented which can be used in the method for replacing broken blades and when rebuilding the blade seat. The method includes milling the base support to reduce its height and redrilling the blade bolt holes. A new independent blade seat is then affixed by double-threaded bushings after which a new blade can then be bolted atop the blade seat.

Abstract: A dove-tail end mill having a cutter shank with a milling head supporting a plurality of replaceable standard 60.degree. triangular cutter inserts. The cutter inserts are designed and oriented with respect to the cutter head to position cutter edges for generating the inclined undercut surface of a dove-tail slot. Simultaneously, the cutter configuration is designed to establish a clearance angle between the lower cutting edge of each of the cutters and the planar surface being generated by the cutter inserts. The milling head defines a plurality of cutter stations each having planar support surfaces for stabilization of the respective cutter inserts and cutter orientation shoulders for accurate positioning of each of the cutter inserts with respect to the cutting head. The cutting head supports each of the cutter inserts to define a cutting rake of about plus 15.degree. and axial rake of about plus 10.degree. and a radial rake of about minus 14.degree..

Abstract: A cutting insert a rotary cutting tool using the same. The cutting insert is a substantially prismoidal body having top, base and side surfaces and cutting edges formed at intersections of the top and side surfaces. The insert, when mounted in the tool, has at least one inoperative side surface which has at least one depression formed symmetrically with respect to a center of the side surface length. An upper portion of the depression is disposed substantially in the vicinity of the top surface. The depression has a bottom wall oriented substantially co-directionally with the side surface and a pair of side walls oriented substantially transversely to the side surface. The depression is designed so that, when the insert is mounted in the tool, at least one wall of the depression constitutes a support of the cutting insert in the direction along an axis of rotation of the tool.

Abstract: An improved cutting tool having a cutting insert mounting member and a star shaped cutter insert holding member of similar diameter: the two members when interfitted, secure a plurality of cutting inserts about the outer circumference of the assembled tool. Secure clamping of the cutters is achieved through both axial and radial clamping forces generated by the action of the holding member. Additional radial and axial clamping forces are exerted on the cutting inserts by centripetal acceleration acting on the members during operation. Depth limiters devices that mount in the tool act as skids on the work surface to control the aggressiveness of the cut. An isolation mechanism may be included to eliminate oscillations transmitted by the hand held power unit to the cutting tool.

Abstract: A cutting bit formed as a round plate for a material removal tool has a base body, which is defined by a bottom face, a top opposite it and spaced apart from it, and a side face between them. The side face, with a chip face located on the top, defines a circular cutting edge. For securing the bit, a central opening which can receive a securing screw, for instance, is provided. To secure the cutting bit in a tool body in a manner fixed against relative rotation, a plurality of depressions, for instance, are provided on the top of the cutting bit and can be engaged by a clamping claw supported on the tool body. Circumferential forces engaging the cutting bit are diverted by way of these depressions, thus preventing torsion or twisting of the cutting bit.

Abstract: A removable cutterhead insert for use in a helical cutterhead for an industrial woodworking machine, the helical cutterhead including a generally cylindrical portion, a plurality of circumferential, spaced grooves extending into the cutterhead body from the periphery of the cylindrical portion and adapted to receive the removable cutterhead inserts, and fasteners for removably securing the cutterhead inserts in the grooves; the cutterhead insert includes a mild steel insert body and two blade units; the insert body having raised portions having triangular pockets formed therein so as to have two inwardly-facing flat portions, a hole to receive the fasteners for removably securing the cutterhead insert in the grooves between the inwardly-facing flat portions and two bolt holes to secure the two blade units to the insert body; and the blade units are triangular with cut-off corners each including a blade edge and configured so as not to occlude the countersunk hole and to have the blades edges disposed to align

Abstract: A generating milling cutter including a supporting body having a plurality of circumferentially and, if desired, axially spaced supporting teeth, each having a radial seat surface and a second seat surface which extends at the root of the supporting teeth substantially perpendicularly thereto for receiving cutting blades or cutting ledges of heavy duty material adapted to be mounted to the teeth. The seat surfaces of the cutting blades or cutting ledges cooperate with a rearward first abutment surface and a lower second abutment surface. The cutting blades or ledges include at their rearside at least a third abutment surface which extends transversely to the rearward first and second abutment surfaces and cooperates with at least one complementary third seat surface of the supporting teeth.

Abstract: To support an indexable cutting insert (6a) cutting with an end edge and facing edge (7a) as well as circumferentially, with respect to both axially acting forces as well as radially acting forces, the tool body (1) is formed with an abutment surface (17) to accept radially directed forces against which the insert can be clamped; to accept axially directed forces, a holding screw (25) passing through an opening (22, 23) in the insert is formed with an accurately machined portion (28) fitting into an accurately machined portion (29) of a reception bore (27) for the screw, so that the holding screw, itself, acts as an accurately placed axial support for the insert (6a).

Abstract: A cutting tool particularly adapted for machining brittle plastics in which the cutting head has its cutting edges in the first and fourth quadrants of the x-y axes and contained in a common plane on opposite sides of the axis of tool rotation. The cutting edges are on two planar inserts, which can be either integral or separate elements, which meet at the common plane and each of which is relieved or cut away in the opposite quadrant from its own cutting edge to expose the cutting edges of the other. The walls defining the reliefs have 2 or more non-aligned sections forming different angles with the axis of rotation with the steepest angle beginning at the axis and preferably inwardly of the tip of the tool and, overall, exposing not less than a full quadrant of the cutting edge of the other insert while providing cavities and contours which control the movement of the chips and the flow of coolant fluids.

Abstract: The invention relates to a cutter block and a knife for chippers for removing particles of wood, which are used for producing particle board and the like. The knife is embodied as a disposable discontinuous or multiple edge knife or as a solid blade knife. The knife has retention and guiding recesses engaged form-fittingly by positioning pins of a support plate. Further, the knife is in compressive contact with a side wall face, trailing in the direction of rotation of the cutter block of the recess in the surface region of the block body.

Abstract: A bit with a fiber cutter for a rosser head debarking machine. The bit has a base for mounting the bit onto the rosser head. The striking edge of the bit is connected to the base and comes into contact with bark and removes the bark as the rosser head spins. The bit has at least one replaceable fiber cutter that includes a cutting edge that cuts through the bark or fiber within the bark as the rosser head spins. Preferably, the fiber cutter is disk-shaped and tapered away from the striking edge and cuts through the fiber in the bark in a perpendicular direction to the fiber. The cutter can be connected to the bit by a threaded bolt that is positioned through a hole in the middle of the cutter and into a threaded hole in the bit. The bit can have threaded holes on both sides to allow two cutters to be installed or for the bit to be rotated.

Abstract: A milling cutter includes a rotary body and a plurality of recesses spaced around its outer periphery for receiving insert-carrying cartridges. Each cartridge is wedge-shaped and is retained in place by a clamping wedge which is fastened in the respective recess by a clamp screw. Each cartridge has serrations on its rear surface which engage corresponding serrations on the rearward wall of the recess. A locating pin extends between a wall of the recess and a surface of the cartridge. The cartridge carries a spring which is compressed by the clamping wedge such that the spring biases the cartridge against the rearward wall of the recess.

Abstract: A substantially square-shaped exchangeable milling insert for mounting in a cylindrical milling cutter tool for millint 90.degree. recesses in a workpiece and having four indexable cutting edges from respective side edges of said base and intersecting said rake surface, each cutting edge comprising first, second and third successive angularly disposed portions being such that during cutting, the first and second portions of a cutting edge cut an upright surface of a substantially 90.degree. recess in a workpiece with a third portion of an adjacent cutting edge serving as a wiper for a base surface of the recess, at least the first and second portions of each cutting edge being so located that all points thereon lie on a cylindrical envelope generated by a line parallel to a rotary axis of the cutting tool and rotating with respect to the rotary axis at a radius equal to the cutting radius of the cutting tool.

Abstract: An adjustable dado having the adjustment ease of a wobble type dado with the cut quality of a stacking type dado. The outer cutting blade is bored and threaded, and a threaded adjusting collar is threaded into the outer blade. An adjustment washer has pins to engage openings in the adjusting collar, so that rotation of the adjustment washer adjusts the position of the outer blade. The invention allows quick and easy adjustment of a stacking dado without removal of the dado blades.

Abstract: In one embodiment of saw tooth assembly, the tubular saw tooth is releasably inserted with friction fit inside the hollow of a tubular mount. In an alternate embodiment, it is the tubular mount which is releasably inserted with friction fit inside the hollow of the tubular tooth. In both cases, the hollows of the mount and tooth are coextensive, whereby a common axial through-channel is defined. The tubular mount is to be anchored to the peripheral edge of a circular saw discoid plate. The wood chip generated during circular saw operation can therefore freely engage through the common through-channel, i.e. through the whole saw tooth assembly, and escape therefrom. Wood chip clogging of the saw tooth during sawing operations is therefore substantially prevented, and the aerodynamic features of the circular are accordingly enhanced.

Abstract: A cutting blade for working logs to timber form while simultaneously removing wood chips which includes a pair of adjacent recesses formed in the periphery of the blade. A knife is bolted in the cutting blade in a first recess and a wear insert is separately bolted to the cutting blade in the adjacent recess. The bolts are countersunk so as not to extend outwardly from the knife or wear insert.

Abstract: A blade mounting for a chipper blade of a wood-chipping machine, the chipper blade having a back and a fore-part, the blade mounting including: a disk coverplate having an inner slope which bears against the back of the chipper blade; a blade holder having at least two grooves which are oriented perpendicular to a longitudinal axis of the blade holder and parallel to a plane of the chipper blade, the blade holder bearing against the fore-part of the chipper blade; adjusting screws located in the grooves in the blade holder; and dogs for underpinning a bottom edge of the chipper blade at at least two locations, the dogs being adjusted by the adjusting screws.

Abstract: An adjustable wobble dado assembly has a planar circular blade with spaced peripheral cutting teeth. The cutting teeth have respective top cutting edges at their radially outer extremities which are located at progressively different radial distances from the axis of the blade so that, when the axis is tilted relative to the arbor for purposes of cutting a groove, those top cutting edges located at progressively greater radial distances from the axis cut portions of the groove located progressively further from the longitudinal center of the groove. The top cutting edges also have respective different top angles relative to the axis of the blade, those edges located at progressively greater radial distances from the axis having progressively greater top angles relative to the axis. An adjustable hub assembly includes a hub composed of an integral portion of the material of the blade having a thickness greater than that of the blade.

Abstract: A novel hob construction includes a plurality of blades and a cylindrical main body having opposite axial ends. Flanges including axially aligned slots for receiving the blades are located only upon the ends of the main body. A chocking material is provided over the circumferential extent of the main body and between the blades for forming an effective physical extension of the body for bonding the blades to the body and to each other.

Abstract: A cutting insert for use with a rotary milling cutter tool has at least one major cutting edge comprising first, second and third successive component cutting edges. Each second component cutting edge is substantially coextensive with the bore and is of substantially greater length than the length of each of the first and second component cutting edges, and defines with respect to the axis of rotation of the cutter tool an axial rake angle which is substantially less positive than the axial rake angles defined respectively to the first and third component cutting edges with respect to the axis of rotation.

Abstract: A ball end mill is disclosed which has an end mill body, an indexable cutting insert, a clamp screw and an engaging portion. The end mill body includes an axis of rotation therethrough and an insert receiving recess formed in a forward end portion thereof. The insert receiving recess has a concavely curved bearing wall. The insert is generally of an elliptical shape having a pair of convexly curved side faces, and is received in the recess with one of the side faces being held in engagement with the bearing wall. The clamp screw releasably secures the cutting insert to the insert receiving recess. The engaging portion is provided on the end mill body so as to be adjacent to the insert receiving recess, and is adapted to be held in engagement with the other side face of the insert.

Abstract: A cutting tool insert to fit in a holding body for mounting to a rotating machine spindle. The cutting tool insert has multiple faces with one face having several in line cutting edges, one behind the other.A vertical V-groove divides the second cutting edge. The cutting tool insert is symmetrical and is removable, turnable about 180.degree. and replaceable to the holding body.

Abstract: A cutting tool is disclosed which includes a tool body having a plurality of mounting recesses formed on an end thereof. Each of the mounting recesses has a mounting face respectively formed at the bottom thereof. The mounting face has a first threaded hole formed therein. A plurality of inserts are each respectively disposed on the mounting face and secured pressed onto the mounting face by means of a clamping screw screwed into the first threaded hole. The cutting tool is characterized in having a plurality of reduced hardness regions respectively formed under the mounting face inside the tool body, each of the reduced hardness regions having the first threaded hole formed therein, the reduced hardness regions having a hardness lower than the hardness of the tool body.

Abstract: A face mill having one or more cartridges for adjustably supporting cutter inserts on the end face of the rotating tool body. Each cartridge has a convex arcuate surface seated against a concave arcuate seat surface formed on or in the milling tool body. A torsion bar is integrally extended from the cartridge parallel to the axis of the concave seat surface. Also, a manual adjustment screw is located perpendicular to the axis of rotation of the cartridge for applying an adjustment force to the cartridge in opposition to the action of the torsion leaf spring. The torsion bar applies a pre-load force to the cartridge. The manual adjustment screw exerts an opposing force that rotates the cartridge to a desired position for proper orientation of the associated cutter insert.

Abstract: A face mill having one or more cartridges for adjustably supporting cutter inserts on the end face of the rotating tool body. Each cartridge has a convex arcuate surface seated against a concave arcuate seat surface formed on or in the milling tool body. A torsion leaf spring is integrally extended from the cartridge parallel to the axis of the concave seat surface. Also, a manual adjustment screw is located perpendicular to the axis of rotation of the cartridge for applying an adjustment force to the cartridge in opposition to the action of the torsion leaf spring. The torsion leaf spring applies a pre-load force to the cartridge. The manual adjustment screw exerts an opposing force that rotates the cartridge to a desired position for proper orientation of the associated cutter insert.

Abstract: A cutting tool employing negative cutting inserts providing both high volume stock removal and a fine surface finish. The insert utilizes negative radial and positive axial rake angles and incorporates a lead angle of between about 30.degree. degrees to about 90.degree. degrees.

Abstract: A ball nosed milling tool that includes a cutter plate having circular segmental cutting edges formed by chord-oriented shoulders inset into opposite faces of the plate. The shoulders form cutting faces that are acutely angled to the midplane of the plate, such that chips are directed away from the rotational axis of the cutter plate. The cutter plate is clamped within a slot in a supporting spindle by means of a threaded fastener that extends transversely through the plate and the spindle. A cylindrical shank portion of the fastener is oriented to exert a cam action on the surface of a hole in the cutter plate, such that the plate is firmly seated in the spindle slot.

Abstract: A thread-cutting tool comprises a shank 10 for attachment to the spindle of a milling machine, the forward end portion of which shank is formed with a flat 12 recessed to provide a pocket for a flat cutting insert 11. The insert, which is triangular in this instance, has one edge formed with a line of threadform teeth of identical profile. The teeth project laterally for cutting engagement with a work-piece. The surface of the work-piece which is to be formed with a thread is mounted on a fixed work-table of the machine.

Abstract: A threadmilling tool is described, of the type that includes a thread cutting insert 14 (FIG. 1) that mounts on an insert holder 12 which is turned by a milling machine, wherein the insert provides four separate cutting edges 30-36 and can be accurately relocated on the holder. The insert has a cross-section forming a mount portion 50 (FIG. 5) with six straight locating sides 51-56 lying on the sides of an imaginary bisymmetrical polygon 58, and forming a radially outwardly-extending arm 60, 62 at each corner of the polygon. Each arm has an outer border 70 and a pair of opposite sides 72, 74 that extend largely radially from the axis 24 of the polygon, and each arm forms a cutting edge (e.g. 30) at the intersection of the outer border and each side of the arm. A tool holder 16 (FIG. 2) for holding the insert, has walls forming, in cross-section, a pair of straight holder positioning surfaces 80, 82 that abut a pair of insert locating sides, while avoiding contact with the arms 60, 62.

Abstract: A helical cutting tool having a plurality of cutting inserts of quadrilateral configuration removably attached to seats formed in the cutting tool, with each insert including a cutting edge extending in the axial direction bounded on opposite sides by a pair of parallel, radially-extending edges. The cutting inserts are disposed in a helical array in which the cutting edge of each insert is spaced in the circumferential direction from the seat of the next adjacent insert and is in overlapping relationship in the axial direction with the cutting edge of the next adjacent insert, and in which the radially-extending edges of each insert are in overlapping relation with the radially-extending edges of the adjacent inserts, such that the cutting edges of all the inserts define a continuous, non-interrupted, cutting line of stepped configuration.

Abstract: A milling tool in which a circular cutter plate is located in a transverse slot formed in a rotary spindle. The circular plate has four chord-oriented shoulders inset into its side faces. A plate holder mechanism has a V-shaped edge configuration mated to two of the chord-oriented shoulders, such that the cutter plate is accurately and firmly located within the slotted portion of the spindle. The plate holder mechanism includes an axially extending post that fits into an axial hole in the spindle for accurately orienting the plate holder mechanism to the spindle.

Abstract: A thread cutter milling tool that includes a cutter body having two sets of cutter teeth. The cutter body is reversibly mountable on a holder so that either set of teeth is presented to the work. Each set of teeth is formed in an edge of the cutter body that is recessed to form a cutter surface and a chip breaker surface. Each chip breaker surface has a dual action for breaking chips and also for locating the cutter body on the holder.

Abstract: A rotatable arbor-type tool for use in a portable power drill is provide for sharpening the ends of metal studs and particularly snowmobile tread studs or spikes. The tool has a cylindrical head with a tapered central opening axially aligned with the axis of rotation of the head. Radial grooves extend from the central opening through the wall of the head to the outer surface thereof. One wall of each groove constitutes an abutment wall against which a preferably triangular cutting blade having a thickness substantially less than the groove width is positioned. The cutting blade is forceably held against the abutment wall by a set screw extending against the cutting blade from the opposite wall leaving an opening extending along the groove past the cutting tool sufficiently wide to provide an exit from the central opening for chips cut from the end of the stud by the cutting edges of the cutting tool. The abutment wall is that wall which faces the direction of rotation of said head.

Abstract: To retain elongated removable cutter elements (9, 90) on an axially elongated cylindrical body structure (1, 1'), eccentric holding plugs (27, 30, 300) are directly or indirectly engageable with the cutter elements so that the cutter elements can be clamped in grooves (5) with converging side walls, by engaging the eccentric elements either directly against the cutter elements (FIG. 4) or indirectly via a resiliently deflectable or deformable portion (16) of the tool body (1, 1'). The tool body can be formed as an open cage structure (1') (FIGS. 5-8) to permit granulated plastic material to fall between rods or rails (34) formed with the grooves (5) in which the cutter elements (9, 90) are retained by the eccenters (27).

Abstract: There is disclosed an insert clamped tool which has a tool holder including a recess formed at a forward end thereof and defining an insert-receiving seat. The tool holder has a pin-receiving hole formed therein so as to open to the insert-receiving seat and having a tapered portion. A positioning pin is releasably received in the hole of the tool holder. The positioning pin has an engaging portion formed at one end thereof and a tapered portion fitted in the tapered portion of the hole. A cutting insert having a mounting bore formed therethrough is received on the insert-receiving seat in such a manner that the engaging portion of the positioning pin is held in abutting engagement with the mounting bore of the insert. A clamp mechanism is arranged on the tool holder for pressing the insert against the insert-receiving seat and the engaging portion of the positioning pin.

Abstract: Boring apparatus includes a multiple start screw to secure a cutting piece to a boring bar. The multiple start screw prevents loosening of the cutting piece during use of the boring apparatus. The multiple start screw also enables easy changing of the cutting piece or repositioning of the cutting piece between periods of use of the apparatus.

Abstract: A double-edged knife detachably mounted on a counter knife. The knife overlies surfaces inclined and oriented so that when the knife is clamped in place, it is held well rearwardly an edge in the knife which is exposed for cutting. Fasteners hold the counter knife and these are protected from damage by a shoulder.

Abstract: A replaceable insert cutter comprising a cutting body, a plurality of insert pockets in the periphery of the body, each pocket having an insert back locating wall establishing insert circumferential position, a V-shaped support seat establishing a radial and axial position of the insert in a radial threaded screw hole extending through from the V support seat, a cutter insert mounted in the pocket having a back surface engaging the back locating wall, a V base of the insert seated on the support seat, a screw hole and screw extending radially through the insert and retaining engagement with the threaded screw hole, and a radially outermost cutting edge facing circumferentially away from the back surface.

Abstract: A ball end mill includes a body, an indexable cutter insert and a clamp screw. The body has a recess formed in a forward end portion thereof and a bore formed therein and opening to a bottom face of the recess. The bore includes a cylindrical portion disposed adjacent the bottom face and an internally threaded portion greater in diameter than the internally threaded portion. The insert includes a front face, a rear face and at least two convexly curved side faces. The front face has at least two convexly curved main cutting edges each defined by the intersection of a respective one of the curved side faces with the front face. The insert has an aperture formed therethrough and extending generally perpendicular to the rear face. The insert is releasably mounted in the recess with the rear face held in contact with the bottom face in such a manner that one of the main cutting edges is indexed in a cutting position.

Abstract: The invention relates to a debarking means for rotation ring type barking machines, and of the type comprising a plurality of swinging arms (1) yieldably engaging the circumference of an unbarked log and each formed at its free end with a seat (4) for a debarking means (2) detachably mounted by means of a bolt connection (3). The debarking means has a leading edge (7) serving as a cutting edge and a trailing support edge or surface (8) adapted to engage a shoulder (5) on the seat (4) to prevent turning of said debarking means relative to the arm. The support edge (8) extends obliquely in relation to the cutting edge (7), more particularly along the entire width of the debarking means and between two side edges of said means which are of different length.

Abstract: Chipper apparatus including a rotating disc with one or more knives mounted on the disc operable to produce wood chips under the cutting action of the knives. Each knife comprises an elongate knife body bounded by opposed cutting edges. The knife includes a back side formed back knife surfaces extending inwardly on the knife from its cutting edges and the back knife surfaces meeting with a bearing surface. The front side of the knife includes front knife surfaces extending inwardly on the knife from its cutting edges joining with an elongated key-receiving channel indented inwardly into the knife body. A knife is mounted on a rotatable chipper disc through a clamp member which bears against the bearing surface of a knife and a counter-knife which supports the front side of the knife and which includes an elongate key portion fitting within the key-receiving channel of the knife.

Abstract: Adzer bit assemblies (18) are of noncircular outer surface configuration and have a noncircular surface seated against a face (15) of similar noncircular shape to hold the assembly against rotation. When becoming worn, the adzing bit assembly can be loosened from the adzing head (99), and rotated to present a fresh cutting surface.

Abstract: A drill having two or more cutting edges is provided with interchangeable cutting members. The cutting members are fastened by screws in corresponding recesses formed in the drill bit. The cutting members are embodied by interchangeable plates and provided with fastening portions behind the main cutting edge, in the direction of cutting. The screws engage through these fastening portions in threaded bores formed in the front face of the drill bit.

Abstract: A face milling cutting tool comprises a cutter body and cutting bits or tips mounted thereon and is characterized in that each cutting tip: is of flat shape with at least one cutting edge of convexly curved contour and has at one part of its peripheral surface a rake surface; is so tangentially mounted that a front clearance face thereof leaves an axial relief angle relative to the surface of workpiece being machined; and is so mounted that the radial rake angle of the curved cutting edge is of a large negative value. The contour shape of a cutting tip may be substantially triangular, rectangular, parallelogrammatic, circular, elliptical, or any other suitable closed figure, or a combination of any of such contour shapes.

Abstract: A milling cutter for machining T-shaped grooves comprises a shaft (1), the free end of which has a disc-shaped head (2) which comprises first blind recesses (3) opening toward its periphery and toward its frontal face (4) and second blind recess (5) angularly displaced with respect to the first recess (3), opening toward the periphery of the disc ad toward its rear face. Each of these recesses (3,5) comprises a seating (7), against which an indexable hard metal cutting insert (11) is fastened.