Abstract: A cutting tool apparatus having a shank and a tool support extension disposed longitudinally adjacent the shank and extending in a direction distal the shank, wherein the tool support extension includes an incurvate taper profile.

Abstract: A high-speed milling cutter has a tool parent body and one or more plate-shaped cutting inserts with a convex, approximately arc-shaped cutting edge. The insert(s) is/are fastened in an insert seat of the tool parent body. Mating elements with mutual contact surfaces for absorbing the centrifugal forces occurring during use are provided in each case between insert seat and cutting insert. The contact surface of the first mating element is designed in the shape of a circular arc, approximately concentrically to the cutting edge. The contact surface of the second mating element is likewise designed in the shape of a circular arc, approximately concentrically to the cutting edge, or consists of at least two contact zones which lie on an imaginary circular arc, approximately concentrically to the cutting edge, the contact surface or the imaginary circular arc coinciding with the contact surface of the first mating element.

Abstract: A tool body includes an insert seat for receiving a cutting insert for chip-removing machining. The insert seat includes a bottom surface and support surfaces upstanding from the bottom surface. Each support surface comprises at least three ridges separated by grooves. Each groove has a depth greater than zero and no greater than 0.015 mm. An insert mounted in the seat by a screw has a center hole whose axis is offset from the axis of a threaded hole of the body in which the screw is connected. That offset distance creates a prestress of the insert toward the ridges. The depth of the grooves (i.e., the height of the ridges) is substantially less than the distance of the offset.

Abstract: A holder (20) for a cutting insert (12), which includes a head (22) with a pocket (24) for holding the cutting insert and a bar device (26) for supporting the head, allows the use of a removable head for a miniature head and bar device that fits into a small hole in a workpiece, and allows rapid and easy replacement of the head. The head has a front part (42) of small height for holding the cutting insert and has a taller rear part (40) of the same height as the bar device. The head rear part has a screw-receiving hole (56) that extends at a downward-rearward incline (A) into a corresponding threaded hole (62) at the front of the bar device. The head and bar device respectively have a recess (70) and a projection (74) that lie around the screw-receiving holes and that align the head and bar device. A coolant passageway system (92) in the bar device provides coolant for both right and left hand heads.

Abstract: A cutting tool has a tool body in which a cutting insert is secured to an insert pocket in the tool body by a fastener. In contrast to the use of a threaded clamping screw, the fastener remains in engagement with the tool body during all stages of the attachment and clamping, or unclamping and removal of the cutting insert. The fastener is rotatable between a clamping position and a non-clamping position by means of one of two keys. One key being capable of engaging one of the fastener's ends, and the other key being capable of engaging the other of the fastener's ends. This is particularly convenient for circumstances where the approach to one or the other of the fastener's ends may be obstructed.

Abstract: Small size insert and insert-blank apparatus for machine tools for grooving and turning have a body with generally parallel and opposing sides, and top and bottom surfaces which have at least a portion thereof inclined from adjacent a first end to the opposite end, and two heads extending from opposite ends of the body, each head having a rear end with which the body forms portions adapted to serve as stops to prevent rearward movement with respect to the machine tool when use. The body of the apparatus is adapted to be mounted in a toolholder having a nest or pocket having an inclined bottom wall which cooperates with the inclined portion of the bottom surface of the apparatus, and a clamp secured to the toolholder having a finger portion cooperative with the inclined portion of the top surface of the apparatus to resist forces on the apparatus during turning.

Abstract: A cutting tool includes a holder and at lest two first cutting inserts. The holder has a number of insert pockets in order to receive those cutting inserts. The cutting inserts are mounted in the holder such that their radially outermost portions lie substantially in an imaginary circle. The circle constitutes an effective diameter of the cutting tool. The cutting tool, in addition, includes at least one second cutting insert provided for a machining operation different from that of the first cutting inserts. The second cutting insert is spaced radially inwardly from the circle.

Abstract: Small size insert and insert-blank apparatus for machine tools for grooving and turning have a body with generally parallel and opposing sides, and top and bottom surfaces which have at least a portion thereof inclined from adjacent a first end to the opposite end. The body of the apparatus is adapted to be mounted in a toolholder having a nest or pocket having an inclined bottom wall which cooperates with the inclined portion of the bottom surface of the apparatus, and a clamp secured to the toolholder having a finger portion cooperative with the inclined portion of the top surface of the apparatus to resist forces on the apparatus during turning. Small size insert and insert-blank apparatus optionally have at least one head having a rear end and a body extending from the rear end of the head having top and bottom surfaces with inclined portions intersecting the rear end of the head forming portions adapted to serve as stops to prevent rearward movement with respect to the machine tool when in use.

Abstract: A cutting tool is disposed on a turret. The cutting tool includes: a holder having a peak end, and a throw-away insert clamped to the peak end of the holder with a clamp screw. The holder has a bottom face and a peak end face defining a corner of the holder. The corner of the holder forms a chamfered face. The throw-away insert has a bottom face and a relief face defining a corner of the throw-away insert. The corner of the throw-away insert forms a chamfered face. The chamfered face of the corner of the holder and the chamfered face of the corner of the throw-away insert prevent the cutting tools adjacent to each other from causing an interference with each other when the cutting tools are at least one of in a standby position and in a machining operation.

Abstract: A cutting tool apparatus having a shank and a tool support extension disposed longitudinally adjacent the shank and extending in a direction distal the shank, wherein the tool support extension includes an incurvate taper profile.

Abstract: A cutting tool has at least one insert receiving pocket with a cutting insert retained therein. The insert receiving pocket has a base wall and a side wall transversely directed to the base wall with a circular recess having a peripheral wall extending downwardly from the base wall. A threaded bore extends downwardly from the lower wall of the recess. The cutting insert has an upper surface, a lower surface and a cylindrical protrusion having peripheral surface extending downwardly from the lower surface. A through bore extends through the cutting insert from the upper surface. A retaining screw passes through the through bore and threadingly engages the threaded bore with the peripheral surface abutting the peripheral wall and with the lower surface abutting the base wall.

Abstract: An apparatus and method for clamping an insert in a tool holder includes a recess and a clamp pin with a lever portion having a curved surface at each end thereof. The recess includes an angled wall for engaging one of the curved surfaces of the lever portion. A wedge portion is disposed within the recess and operatively coupled to a lock screw such that rotation of the lock screw causes movement of the wedge portion in a first direction. A biasing force is applied to the lever portion to cause the clamp pin to move in a second direction that is different than the first direction. The wedge portion includes one or more angled walls for engaging one of the curved surfaces of the lever portion. Movement of the wedge portion in the first direction causes the angled wall of the recess to act as a cam surface to cause the clamp pin to pivot about a pivot point, P, located along a central axis of the clamp pin.

Abstract: The present invention provides a cutting tool assembly having a cutting insert holder and a cutting insert. The cutting insert holder has a clamping jaw, a base jaw and an inner side surface extending therebetween. An insert pocket is defined between the two jaws and the inner side surface. The inner side surface is provided with a positioning member. A clamping screw passes through the upper clamping jaw and is threadingly connected to the lower clamping jaw. The cutting insert has a central body portion having a side surface provided with a location member which is engaged by the positioning member whereby the axial location of the cutting insert is fixed.

Abstract: An apparatus and method for clamping an insert in a tool holder includes a recess and a clamp pin with a lever portion having a curved surface at each end thereof. The recess includes an angled wall for engaging one of the curved surfaces of the lever portion. A wedge portion is disposed within the recess and operatively coupled to a lock screw such that rotation of the lock screw causes movement of the wedge portion in a first direction. A biasing force is applied to the lever portion to cause the clamp pin to move in a second direction that is different than the first direction. The wedge portion includes one or more angled walls for engaging one of the curved surfaces of the lever portion. Movement of the wedge portion in the first direction causes the angled wall of the recess to act as a cam surface to cause the clamp pin to pivot about a pivot point, P, located along a central axis of the clamp pin.

Abstract: A rotatable tool includes a rotatable body defining an axis of rotation. The body forms a seat configured to receive a cutting insert. The seat includes a bottom surface and a radial support upstanding therefrom. The bottom surface includes a screw-receiving hole which intersects the bottom surface to form a port therein. The screw-receiving hole includes a female screw-threaded portion spaced from the port by a non-threaded portion. A fastening screw secures the cutting insert to the body. The screw includes a shaft having at one end thereof a male screw thread connectable to the female screw threaded portion, and at an opposite end thereof a head. The shaft also includes a non-threaded portion disposed between the male screw thread and the head and sized to be received in the non-threaded portion of the screw-receiving hole.

Abstract: A tool includes a holder body having a pocket which has a bottom surface and at least one upstanding support surface. A cutting insert is provided in the pocket, the cutting insert having a side surface structure. The support surface is provided with a cavity which contains a rounded member (e.g., a cylindrical pin). The rounded member is stationarily mounted in the cavity, and a portion of a convexly rounded outer surface of the rounded member protrudes past the cavity and into the pocket. A securing element is attached to the holder to force a side surface of the insert against the convexly rounded surface.

Abstract: Small size insert and insert-blank apparatus for machine tools for grooving and turning have a body with generally parallel and opposite sides, and top and bottom surfaces which have at least a portion thereof inclined from adjacent a first end to the opposite end. The body of the apparatus is adapted to be mounted in a toolholder having a nest or pocket having an inclined bottom wall which cooperates with the inclined portion of the bottom surface of the apparatus, and a clamp secured to the toolholder having a finger portion cooperative with the inclined portion of the top surface of the apparatus to resist forces on the apparatus during turning.

Abstract: A metal cutting insert for the chip-forming cutting (e.g., grooving) of metal workpieces includes a body having a top surface, a bottom surface, and a side surface interconnecting the top and bottom surfaces. A front end of the insert forms a straight cutting edge, and a rear end of the insert forms a convexly curved abutment surface which abuts a concavely curved support surface of a holder. The abutment surface and the support surface have equal radii. The bottom surface of the insert comprises a V-shaped tongue which fits within a V-shaped groove of the holder. The side surface includes a front portion that forms an acute angle with the top surface, and a pair of intermediate portions that are convergent in a direction away from the cutting edge.

Abstract: The present invention relates to a tool for chip removing machining, which comprises a holder (1); as well as a tool head (13) connected therewith, which carries at least one cutting insert (18) for chip removing machining, the holder (1) and the tool head being connected to each other by means of serrated surfaces (10, 2), and that the tool comprises members (12, 15, 16) for connecting the tool head (13) with the holder (1). The invention also relates to a tool head (13) and a holder (1) separately. What characterizes the tool according to the present invention is that the dividing plane (4), which is formed by the serrated surface (10) of the holder (1) and the serrated surface (2) of the tool head (13), forms an angle of 45° to a second basal plane (Bp2) of the tool.

Abstract: A cutting tool comprising a holder and a cutting insert mounted therein. A second bore of the holder extends downwardly from an insert receiving pocket. A third bore extends rearwardly from the second bore and opens into a fourth bore. A locking pin inserted in the second bore protrudes upwardly into the first through bore. A protrusion extends rearwardly from an upper portion of the locking pin. A rearwardly facing groove in a lower portion of the locking pin is co-aligned with the third bore. A plunger is received in the third bore. A forward portion of the plunger is in contact engagement with the groove. A rear portion of the plunger has a first engagement surface transversely directed to a first axis (A) of the plunger. A clamping member, engaged in the fourth bore and having a second engagement surface, is in contact engagement with the first engagement surface.

Abstract: A wear insert for a tool holder includes a top surface and a bottom surface with a dimple disposed in the top surface. A boss is disposed within the dimple. The tool holder for releasably securing the wear insert has a tool holder body including an insert-receiving pocket formed at a forward end. The tool holder body has a bottom and at least one side wall for receiving an insert. The tool holder includes an internally threaded clamp-securing bore formed between an inclined surface and the insert-receiving pocket. A clamp is arranged on the tool holder body and including a lower face with a nose portion having a shaped lip and a clamp contour portion. The clamp also has a threaded aperture formed therethrough. A clamp screw is inserted into the threaded aperture of the clamp.

Abstract: A rotatable tool includes a rotatable body defining an axis of rotation. The body forms a seat configured to receive a cutting insert. The seat includes a bottom surface and a radial support upstanding therefrom. The bottom surface includes a screw-receiving hole which intersects the bottom surface to form a port therein. The screw-receiving hole includes a female screw-threaded portion spaced from the port by a non-threaded portion. A fastening screw secures the cutting insert to the body. The screw includes a shaft having at one end thereof a male screw thread connectable to the female screw threaded portion, and at an opposite end thereof a head. The shaft also includes a non-threaded portion disposed between the male screw thread and the head and sized to be received in the non-threaded portion of the screw-receiving hole.

Abstract: A tool for chip removing machining includes a holder having a top side in which is formed a seat for a cutting insert to be clamped by a clamping mechanism. That clamping mechanism includes a clamping body movable inside a cavity formed in the holder. The body carries a finger which passes through a hole formed in a bottom surface of the seat and engages the cutting insert. A rotatable screw is provided in a bore of the holder and extends into the cavity. The screw is formed with a thick first portion, as well as a thinner second portion having a male thread which is in engagement with a female thread formed in a through-hole of the clamping body. The bore in the holder is cylindrical and has a smooth surface, and the thick portion of the screw has a cylindrical smooth envelope surface which is rotatably mounted in the bore. A free end of the screw is supported by an end wall of the holder. The finger is completely surround by the bottom surface of the seat.

Abstract: A tool for material-removing machining of workpieces of hard metal with a blade plate held by a clamping lug is suggested which is distinguished in that the blade plate (11) has a groove (25) provided on the front side (45) in which the clamping lug (13) engages.

Abstract: The present invention provides a cutting tool assembly having a cutting insert holder and a cutting insert. The cutting insert holder has a clamping jaw, a base jaw and an inner side surface extending therebetween. An insert pocket is defined between the two jaws and the inner side surface. The inner side surface is provided with a positioning member. A clamping screw passes through the upper clamping jaw and is threadingly connected to the lower clamping jaw. The cutting insert has a central body portion having a side surface provided with a location member which is engaged by the positioning member whereby the axial location of the cutting insert is fixed.

Abstract: A cutting insert intended for chip removing machining includes a body forming at least one cutting edge, a securing structure such as a helical thread disposed at one side of the body, and a key grip such as a profiled recess disposed at an opposite side. The insert is formed of injection molded cemented carbide such that the body, the securing structure, and the key grip are all integral with one another. The insert is secured in a holder by rotating the insert using a key which engages the key grip, whereupon the securing structure engages a complementary securing structure on the holder to pull the insert body against the holder.

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 toolholder for easy indexing in areas of limited access. In an outer end of the toolholder runs a through channel in which a bent bolt is inserted. The channel extends through the toolholder and is open at an outer end of the toolholder.

Abstract: A chisel holder is connected exchangeably in a fixed manner to at least one base mount disposed on a surface of a cylindrical cutting device, such as a cutting machine or a line milling machine, in a manner obviating use of a threaded setscrew. A borehole extends through the base mount, and a securing bolt received therein grips at least regionally through or behind an aligned recess formed in the chisel holder. The securing bolt is then clamped or locked to the base mount without use of threads.

Abstract: A cutting insert has an upper surface bounded by a cutting edge, a base, and a peripheral flank surface. The shape of the peripheral flank surface varies along the height of the cutting insert. Near the top of the peripheral flank surface, it conforms to the round or polygonal geometry of the cutting edge so as to provide support for the cutting edge. Lower down the cutting insert, the peripheral flank surface is shaped to provide transverse bearing surfaces which have considerably lower pressure angles, i.e., resistance to turning moments, than would be provided by the inherent geometry of the cutting edge. Preferably, these transverse bearing surfaces are formed by recessed features such as channels, and most preferably, as chevron-type channels. This latter possibility leads to a lower cross-sectional geometry which approximates to an n-pointed star.

Abstract: A cutting tool assembly having a longitudinal axis comprises a cutting insert (3) to be releasably retained in a tool holder (1). The cutting insert (3) is formed with a through bore (21) having spaced apart, peripherally located, radially directed support wings (22). The tool holder (1) is provided with a coupling member (11) having a plurality of corresponding radially extending abutment wings (15). The coupling member (11) of the tool holder (1) is rotatable and axially displaceable with respect thereto.

Abstract: A tool includes a cutting head and a holder, wherein the cutting head and the holder form two cooperating surfaces that are pressed together. The surfaces possess rows of alternating parallel grooves and ridges for locking the surfaces to each other. Each of the surfaces has two rows of grooves, one row oriented 90.degree. relative to the other row. On one of the surfaces, some of the grooves of one row are in non-intersecting relationship with the grooves of the other row. On the other surface, the rows extend completely across one another, whereby the rows together form a waffle-like pattern. The cooperating surfaces allow at least four separate relative positions between the cutting head and holder.

Abstract: An indexible cutting insert for chip-breaking metal machining comprises an upper surface or chip surface, a lower bottom surface which is substantially plane parallel to the upper surface, and at least a side surface extending between the surfaces, which forms an acute angle with the upper surface and an obtuse angle with the bottom surface. The side surface has at least two bulging portions which are intended to function as support surfaces against the support surfaces in an insert seat.

Abstract: A boring bar includes a shaft and a head which carries a cutting insert. The head includes a conical protrusion which fits in a correspondingly shaped recess of the shaft and is secured therein by an adhesive joint in order to damp vibrations.

Abstract: A tool for cutting metal machining comprises one or several cutting insert seats (1), each one for an indexable cutting insert, each insert seat comprising a bottom support surface (10) and at least two side surfaces, which form a right angle with each other. One of these side surfaces comprises two side surfaces (12, 16), which are located at different distances from the bottom support surface (10), one of these being intended as a support surface for square cutting inserts and the other as a support surface for specially shaped hexagonal inserts. In this way, one and the same insert seat can accommodate either a square or a hexagonal cutting insert, which considerably improves cutting economy.

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 tool assembly has a tool holder having a holder support face, a clamping dog having a dog surface spaced from and facing the holder support face, and a tool between the holder and the dog and having an end cutting edge, a face directly confronting the support face, and a surface directly confronting the dog surface. One of the surfaces is formed with a recess and the other surface is formed with a bump engageable in the recess. The dog surface can be pressed in a clamping direction generally perpendicular to the faces and surfaces toward the support surface and to clamp the tool between the dog and the support. The bump and recess are so dimensioned that they engage each other at at least three locations spaced from one another perpendicular to the clamping direction.

Abstract: Disclosed is a lathe cutting tool assembly found of a tool holder which has a seat to accommondate a cutter insert, the cutter insert being provided with a clamping groove or bore. The insert is held in the tool holder by a clamping shoe. The clamping shoe is tightly secured to on the tool holder. To protect the clamping shoe and improve the seating of the cutter insert in the tool holder, a clamping plate is secured to the clamping shoe and lies upon the cutter insert. A projection is provided on the bottom of the clamping plate facing the cutter insert and is in clamping contact with the groove or bore. The tool assembly is especially adapted for a turning chisel.

Abstract: A cutting tool assembly comprising a tool holder formed with an insert retaining pocket having a pocket base wall and in which is releasably mounted a cutting insert and a shim. The cutting insert is of a substantially prismatic shape having an upper surface, a lower surface and side relief flank surfaces and at least one cutting corner defined therebetween and presenting at least one cutting edge formed by the intersection of the upper surface and a corresponding number of the side relief surfaces adjacent thereto.

Abstract: A metal cutting insert is directly mounted on a support surface formed either by an insert holder, or by a shim interposed between the insert and insert holder. The insert includes a bottom surface having grooves and planar surface portions disposed between the grooves. The support surface includes ribs which fit into respective grooves of the insert. Some of the planar surface portions of the insert bear against a planar, rib-free portion of the support surface.

Abstract: A metal cutting including a tool head, a cutting plate, and a snap-locking arrangement for securing the cutting plate to the tool head and formed of a projection, extending from the cutting plate or the bottom of the cavity, which is formed in tool head for receiving the cutting plate, into a hole formed, respectively, in the bottom of the tool head cavity or in the cutting plate, and a snap-action locking element located in the hole for engaging the projection and retaining it in the hole.

Abstract: A cutting tool assembly with a clamping mechanism for releasably clamping a tool bit (18) on a tool holder (10) is disclosed. The tool holder (10) defines an elongated planar seating surface (12) with a socket (14) on its forward end and a threaded bore (20) on its rear end. A further threaded bore (22) is provided in the seating surface intermediate the forward and rearward ends. A conical tool bit (18) forms a circular cutting edge (52) and has a shank (16) adapted to be received in the socket (14). An elongated bar-shaped clamping member (32) has one end engaging in a circumferential groove (28) of the tool bit (18). The opposite end of the clamping member (32) has arcuate concave surface portion (32b) for abutment with the conical surface on a tapered head (34) of an adjustment screw (36) engaged in the threaded bore (20) of the seating surface (12).

Abstract: A cutting tool assembly comprising a tool holder formed with an insert retaining pocket having a pocket base wall and in which is releasably mounted a cutting insert and a shim. The cutting insert is of a substantially prismatic shape having an upper surface, a lower surface and side relief flank surfaces and at least one cutting corner defined therebetween and presenting at least one cutting edge formed by the intersection of the upper surface and a corresponding number of the side relief surfaces adjacent thereto.

Abstract: A form insert toolholder assembly including a toolholder having a base. The base includes a base inclined surface having an outer edge and an inner edge. The base further includes a clamp receiving portion having top wall, a first side wall and a second side wall. The top wall defines a clamp receiving portion opening. The inner edge and the first side wall define an insert pocket. A pin is positioned on the base inclined surface between the outer edge and the inner edge. The assembly further includes a clamp having an upper surface and a lower surface. The clamp defines a clamp opening extending from the upper surface to the lower surface. The lower surface has a clamp inclined surface that is parallel to the base inclined surface. The assembly further includes an insert having a cutting edge, a mounting edge, a first end, a second end, a base surface and a clamp surface.

Abstract: A cutting insert (10) or (10') for boring machines is constituted by a substantially prismatic body, with two cutting sides, whose front surface is centrally provided with a slightly concave portion (12) or (12'), which extends for the whole longitudinal development. The insert (10) or (10') is locked in a traditional hollow space (16) obtained on the head (18) of a boring machine, by means of one or more screws (20) whose lower sector, substantially truncated-conic, shows a slight convexity, perfectly complementary to the concave configuration of the central portion (12) or (12') of said insert.

Abstract: A stump-grinding apparatus includes a primer mover secured to a frame having a pair of wheels and a handle. A cutting wheel is secured to the prime mover for rotation. At least one cam member is coupled between the wheels and the frame and is operable from the handle to selectively adjust the height between the cutting wheel and the object to be disintegrated. A throttle member is also secured to the handle for selective control of the prime mover. The cutting wheel has a generally disk-shaped element having an outer diameter. At least one cutting tooth having a leading cutting edge and a generally opposite trailing cutting edge is secured to the outer diameter of the disk to define a selected angle between the leading cutting edge and a line parallel to the axis rotation of the cutting wheel. This angular offset permits the cutting wheel to cut a wider kerf, and to impart a slicing action in addition to the chipping action of the teeth.

Abstract: A knife assembly for a disc type wood chipper includes a reversible disposable knife having a serrated back bearing surface positioned between a serrated knife clamp and a flat counterknife. The knife can be reground and advanced along the serrated clamping surface of the clamp so as to maintain a desired edge position with respect to the surface of the chipper disc and the anvil surface.

Abstract: A cutting tool having a positioning block inserted between the cutting insert and the insert-receiving seat is disclosed. The disclosed cutting tool demonstrates excellent resistance to damage by severe vibration caused by the milling process. The cutting tool of the present invention comprises (a) a tool body having a recess formed at a forward end thereof and defining a insert-receiving seat; (b) a cutting insert; (c) a positioning block to be placed between the cutting insert and said insert-receiving seat, having a top and bottom faces and having a hardness thereof which is lower than that of a surface of an insert-receiving seat; and (d) clamp means for securing the cutting insert and the positioning block on the insert-receiving seat. The above described positioning block is able to absorb some extent of vibration of the cutting insert during the milling process. According to the present invention, there is also provided the cutting tool in which a positioning block has two layers.

Abstract: A variable tool bit holder which takes the place of up to eight standard tool bit holders for machining a workpiece including a shank member having a generally elongated rectangular configuration, and a groove positioned on an end portion of the shank member and comprises an end groove portion extending across an end surface of the shank member and side groove portions extending horizontally on the left and right side surfaces of the shank member toward the opposing end surface for a distance at least equal to the end surface groove portion; a support blade having top and bottom surfaces each defined by a frontally disposed V-shaped bit-receiving forward edge portion and a rearwardly disposed planer top surface disposed above the plane of the bit-receiving surface; a transversely projecting elongated rib extending longitudinally along the inner side of the support blade and adapted to be inserted in a selected groove portion and releasably secured thereto; an insert bit having opposing cutting tips and a V-sh