Abstract: A saw blade is provided which includes an inner collar separated from an outer collar with a resilient isolated layer. The inner collar fastens to the arbor shaft of a driving motor, while the outer collar is welded to the rim containing hardened particles, such as diamond bits. The inner and outer collars form inner and outer collar flanges which receive the resilient isolating material therebetween. In an alternative embodiment, the inner and outer collars are separated from one another with a plurality of plugs formed of resilient isolating material. The plurality of plugs are formed in a circular pattern about the arbor shaft and are spaced apart from one another. In another embodiment, a vibration dampening coupler is fastened to the arbor shaft and formed separate from the cutting blade. The isolating resilient layer may be formed as a solid layer, as a plurality of O-rings, or with a void therein.

Abstract: In a plating process for constructing a nickel/embedded abrading particle saw blade on a saw blade substrate, the step of plating abrading particles onto and within the supporting copper substrate is disclosed. The beveled edge of a circular aluminum saw blade blank is first coated with a thin zinc layer. Thereafter, copper and abrading particles are plated followed by conventional abrading particle and nickel plating. Conventional material removal thereafter follows at the saw blade side adjacent the circular saw blade blank, saw blade edge, and copper layer. With removal of the copper layer, abrading particles originally partially embedded in the copper layer are exposed for cutting. The need for electro-polishing and garnating is eliminated in so far as exposure of abrading particles is concerned. The final saw blade product produced has uniform cutting edges on both sides with less likelihood of producing edge fractures, chips, or cracks in silicon wafers during separation.

Abstract: A blade comprises a disc-shaped substrate having a major surface and an outer peripheral edge portion encircling the major surface, and an abrasive grain layer mounted on the outer peripheral edge portion of the substrate. The substrate includes a first disc having a major surface, and a second disc having a major surface which is superposed on that of the first disc. The major surface of the second disc is separated from that of the first disc, thereby defining a clearance between the major surfaces of the first and second discs and correspondingly forming a convex surface region on the outside surface of the substrate. The peripheral portion of the convex surface region is provided with a contact portion where the major surfaces of the first and second discs are slidably in contact with each other.

Abstract: Multifunctional blade designs for rotational oscillating cutting include, in one aspect, different cutting teeth segments and cutting agent segments arranged along separate portions of a common cutting edge to carry out various cutting tasks. In another aspect, non-circular cutting blades have separate cutting edge segments, each segment having different cutting teeth or cutting agents. The blade edge may include one portion having grit bonded to the cutting edge to cut hard objects, and another portion having cutting teeth for cutting softer objects. Likewise, the blade edge may include two portions, each having cutting teeth of differing size and pitch to cut differing materials. Another embodiment comprises a triangular blade, the sides of the triangle provided with cutting grit bonded to the edges. Alternatively, at least one side of the triangle may include cutting teeth, so that each side of the triangle is adapted to cut different types of materials.

Abstract: The invention relates to abrasive grinding wheels with an organic binder, comprising a reinforcement in the form of metal fibers. Preferably, those fibers are in the form of "vitreous" metallic ribbons.The grinding wheels according to the invention are advantageously more durable and more conductive.

Abstract: A mounting for use in mounting rotating cutting blades to the drive shaft of saws is provided. The mounting is an arbor or arbor sleeve having a non-symmetrical outer mounting surface onto which is mounted a cutting blade which contains a similarly configured mounting hole. The arbor or arbor sleeve is designed for use with a cutting blade having a mounting hole which, when viewed from one side of the blade is the same as the outer surface mounting surface, and which viewed from the other side of the blade is not the same. The use of the arbor or arbor sleeve of the present invention with a cutting blade having these characteristics results in the blade being mounted on the saw in only one orientation.

Abstract: A mounting for use in mounting rotating cutting blades to the drive shaft of saws is provided. The mounting is an arbor or arbor sleeve having a non-symmetrical outer mounting surface onto which is mounted a cutting blade which contains a similarly configured mounting hole. The arbor or arbor sleeve is designed for use with a cutting blade having a mounting hole which, when viewed from one side of the blade is the same as the outer surface mounting surface, and which viewed from the other side of the blade is not the same. The use of the arbor or arbor sleeve of the present invention with a cutting blade having these characteristics results in the blade being mounted on the saw in only one orientation.

Abstract: In a plating process for constructing a nickel embedded abrading particle saw blade on a saw blade substrate, the step of plating abrading particles onto and within the supporting copper substrate is disclosed. The beveled edge of a circular aluminum saw blade blank is first coated with a thin zinc layer. Thereafter, copper and abrading particles are plated followed by conventional abrading particle and nickel plating. Conventional material removal thereafter follows at the saw blade side adjacent the circular saw blade blank, saw blade edge, and copper layer. With removal of the copper layer, abrading particles originally partially embedded in the copper layer are exposed for cutting. The need for electro-polishing and garnating is eliminated in so far as exposure of abrading particles is concerned. The final saw blade product produced has uniform cutting edges on both sides with less likelihood of producing edge fractures, chips, or cracks in silicon wafers during separation.

Abstract: An abrasive wheel, in particular an abrasive cutting-off wheel, comprises an annular cylindrical inner support of metal and an abrasive ring surrounding the latter, both being connected with each other. The abrasive ring projects on both sides from the support in the direction of the common axis. The abrasive ring can be ground off completely. The support is re-usable or at least recyclable.

Abstract: A concrete cutting saw is provided for the cutting of grooves in the surface of wet concrete. The concrete saw generally comprises a motor driven rotating cutting blade mounted on a support structure. The concrete saw is supported during cutting by wheels, and has a skid plate with a slot through which the rotating cutting blade passes to cut the concrete. The cutting blade is mounted with a sound deadening blade housing and a number of shields and guards located about the skid plate. The skid plate is movably attached to the concrete saw and resiliently urged against the concrete during cutting so that it remains in contact with the surface of the concrete surrounding the cutting blade during cutting. The skid plate is constrained into a bowed configuration so that it is substantially flat during cutting. A variable speed transmission is drivingly connected to the wheels to propel the saw across the concrete during cutting.

Abstract: A rotating tool includes e hub having a central section for attaching the hub to a rotatable shaft and a disc-shaped hub section surrounding the central section. The central section and the hub section are comprised of an elastomeric material and formed as a unitary body. A plurality of sleeves are embedded in the hub section with each sleeve having an end terminating in the hub section and an opposing end protruding from the hub section. The protruding ends are spaced around the circumference of the hub section. Working tips are fastened in the protruding end of each sleeve. Each working tip has a base disposed in the protruding end of the sleeve and a tip protruding from that end of the sleeve. In an alternative embodiments, the hub section has a plurality of projections in which the sleeves are embedded.

Abstract: A saw blade is provided which includes an inner collar separated from an outer collar with a resilient isolated layer. The inner collar fastens to the arbor shaft of a driving motor, while the outer collar is welded to the rim containing hardened particles, such as diamond bits. The inner and outer collars form inner and outer collar flanges which receive the resilient isolating material therebetween. In an alternative embodiment, the inner and outer collars are separated from one another with a plurality of plugs formed of resilient isolating material. The plurality of plugs are formed in a circular pattern about the arbor shaft and are spaced apart from one another. In another embodiment, a vibration dampening coupler is fastened to the arbor shaft and formed separate from the cutting blade. The isolating resilient layer may be formed as a solid layer, as a plurality of O-rings, or with a void therein.

Abstract: An apparatus and method for processing and cutting structural concrete is disclosed in which the apparatus includes a first, larger cutting blade and at least one smaller cutting/finishing blade positioned adjacent to the larger cutting blade. The smaller blade have a beveled or concave cutting surface so that as the larger cutting blade forms cuts into the concrete, the smaller cutting/finishing blade rounds or bevels the edges of the cut. The rounded or beveled edges have a greater surface are and, therefore, additional strength to prevent chipping or cracking along the cuts. In the preferred embodiment, a smaller blade is positioned adjacent to each side of the larger blade to round or bevel both edges of the cut as the cut is formed by the larger blade. In accordance with one aspect of the invention, the above described apparatus can be used on previously made cuts in concrete to round or bevel the edges and avoid breakage or chipping.

Abstract: The present invention is related to an abrasive tool comprising a core and abrasive segments attached to said core wherein said abrasive segments comprise a bond material and superabrasive grains and wherein said segments comprise at least two circumferentially spaced regions and wherein said superabrasive grains are alternately dispersed in said regions in high and low concentrations of superabrasive grains. The present invention is further related to an abrasive tool comprising a core and abrasive segments attached to said core wherein said abrasive segments comprise a bond material and superabrasive grains, wherein said abrasive segments comprise at least two circumferentially spaced regions and wherein said superabrasive grains are alternately dispersed in every other region.

Abstract: In a grinding wheel for use in a grinding machine, a plurality of grinding tips are bonded on the outer peripheral surface of a wheel core having a disk-like shape by bond. On both side surfaces of the wheel core are formed with depressions continuous with the outer peripheral surface of the wheel core. Bond is filled between the outer peripheral surface and the grinding chips, and filled in the depressions of the wheel core to form a bonding layer. Namely, the bonding layer has side portions which extends along both side surfaces of the wheel core in a radial direction.

Abstract: A diamond impregnated saw blade of the type used in dicing saws is adapted for mounting on a high cooling flange or standard flange hubs and useful for cutting very hard objects. The saw blade is made in the form of an annular ring comprising a homogenous mixture of diamonds held in situ by a binder material and is characterized by alternately spaced raised teeth and recessed cooling grooves through which a stream of cooling fluid is directed into the kerf of an object being cut as well as on all cutting surfaces of the cutting saw blade.

Abstract: A saw blade having a central aperture for mounting on an arbor of a concrete cutting machine is disclosed with the arbor having a raised mounting boss corresponding in shape and size to the central mounting aperture of the saw blade. The central mounting aperture of the saw blade is triangular in shape with one apex of the triangle overlying the perimeter of the arbor and the other two apexes of the triangle within the face of the arbor.

Abstract: A method is provided for manufacturing a segmented diamond blade. The method includes the steps of placing a core into a mold and pouring a metal mixture into a mold cavity surrounding the core. The metal mixture is cold pressed to the core to form a blade having a continuous outer rim. Thereafter, the core and outer rim are suspended in a free-sintering furnace which is heated to an initial diffusion bonding temperature. The core and outer rim are heated for an initial bonding time period. Thereafter, the furnace is heated to a final diffusion bonding temperature and the core and outer rim are maintained at this temperature for a final diffusion bonding time period. After the blade cools, it is placed in a cutting tool and segmented. During segmentation, a plurality of radially aligned notches are cut through the outer rim and a corresponding plurality of gullets are cut in the core. During cutting, an inert gas, such as helium, argon or the like, is blown under high pressure directly onto the cutting point.

Abstract: A saw comprises a saw blade having an outer edge, and a diamond-containing coating carried on the outer edge of the saw blade, the saw blade being composed of a synthetic plastic reinforced with a fiber material composed of a plurality of fibers with a volume fraction of 30-70%.

Abstract: A rotating cutting blade and its drive motor are mounted on a wheeled support platform. The blade extends through a skid plate depending from the platform, in order to cut the concrete below the skid plate. The slot in the skid plate has its ends configured to fit within predetermined distances of the corresponding ends of cutting segments on the cutting blade. The cutting segments are configured to have a generally inverted "T" configuration in which a central cutting segment extends radially outward from two cutting segments located on opposite sides of the central segment. The exterior edges of the cutting segments may be square or rounded. The juncture between the central and shoulder segments may be square or rounded. The concrete is advantageously cut before it hardens to 1200 psi, without the use of an added lubricant, or above that hardness with lubricant if the cutting blade is supported within a sufficiently close distance by a skid plate.

Abstract: In a diamond cutting saw blade, a plurality of slits 1 are formed at regular intervals on the outer periphery of a disc-shaped iron substrate 2, and a plurality of segment chips 3 are fixed onto the outer periphery of the disc-shaped iron substrate 2. Two trapezoidal concave portions 4 which expand outwardly are formed on both sides of the outer periphery of each segment chip 3. Further, a trapezoidal concave portion 5 is formed at the intermediate position of the segment chip 3 on a joint surface of the iron plate 2 so as to expand toward the joint surface. At the corner where a bottom surface 4a and a tapered surface (side surface) 4b of the concave portion 4 formed on the outer periphery intersect, there is formed a curved surface 4c having a radius of 1.0 to 2.5 mm. Similarly, in a concave portion 5 formed in the inner periphery of the segment chip 3, there is formed a curved surface 5 c having a radius of 1.0 to 2.

Abstract: An agricultural tool including a disc blade incorporating hard wear resistant inserts for attachment to an axial member of an agricultural tool for rotation through the soil. The disc blade includes parallel spaced flat round front and rear surfaces having a central cylindrical opening. The front surface tapers radially outwardly to the rear surface thereby defining a common outer rim having a knife edge. A plurality of notches are spaced circumferentially along the front surface of the disc blade and inwardly from the outer edge of the front surface of the disc blade. The notches are configured to receive a plurality of hard wear resistant inserts to provide improved wear resistance.

Abstract: A base blade for circular saw blades or abrasive cutting disks, comprising of a circular disk body fabricated at least partially of plastic material reinforced with embedded fibers. The fibers are arranged in many fiber layers laying upon one another which are connected without gaps, are plane, circular-disk shaped, and concentric to the disk body. In a first type of fiber layer, the fibers are arranged with respect to the body of the disk in an at least approximately radial direction in straight lines, and are arranged in a uniform distribution along the entire extent. In a second type of fiber layer, the fibers run essentially concentrically to the disk body in an at least approximately circular manner. The two types of fiber layers are arranged in the disk body in a distribution chosen as a function of the size of the disk body.

Abstract: A saw comprises a saw blade having an outer edge, and a diamond-containing coating carried on the outer edge of the saw blade, the saw blade being composed of a synthetic plastic reinforced with a fiber material composed of a plurality of fibers with a volume fraction of 30-70%.

Abstract: A grinding tool bit is formed of a disk-shaped base member (1) with a central through opening (6) for attaching the base member to a drive spindle of a machine tool. The base member (1) is covered with individual cutting elements (4) at the radially outer circumferential surface (2) and in the side faces (3) adjacent the outer circumferential surface (2).

Abstract: Diamond cutting tools such as a diamond core drill and a disk-shaped diamond saw which are used to grind and cut hard articles in order to bore or cut hard articles. The diamond cutting tools comprise a tool body and a diamond blade portion attached to an outer end of the tool body. The diamond blade portion has a plurality of outer cuts formed at an outer end thereof and a plurality of inner slots formed under and between the outer cuts and higher than the bottoms of outer cuts by a certain depth. The diamond cutting tools can carry out effectively boring or cutting work until the expensive diamond blade portion is completely worn away.

Abstract: A mounting for use in mounting rotating cutting blades to the drive shaft of saws is provided. The mounting is an arbor or arbor sleeve having a non-symmetrical outer mounting surface onto which is mounted a cutting blade which contains a similarly configured mounting hole. The arbor or arbor sleeve is designed for use with a cutting blade having a mounting hole which, when viewed from one side of the blade is the same as the outer surface mounting surface, and which viewed from the other side of the blade is not the same. The use of the arbor or arbor sleeve of the present invention with a cutting blade having these characteristics results in the blade being mounted on the saw in only one orientation.

Abstract: A cutting wheel, especially suitable for dicing silicon wafers and the like, which has a high degree of stiffness as a result of the wheel being a monolith with a thick inner section and thin outer or cutting section.

Abstract: A contoured cutting element for cutting a contoured groove, i.e. other than square or rectangular, in a substrate of plastic, metal, concrete, asphalt, macadam, stone or the like has a cutting surface whose length, in the direction of cutting of the element is directly proportional to the amount of material that portion of the cutting surface must remove to provide uniform wear on the cutting surface over long periods of usage.

Abstract: A mounting for use in mounting rotating cutting blades to the drive shaft of saws is provided. The mounting is an arbor or arbor sleeve having a non-symmetrical outer mounting surface onto which is mounted a cutting blade which contains a similarly configured mounting hole. The arbor or arbor sleeve is designed for use with a cutting blade having a mounting hole which, when viewed from one side of the blade is the same as the outer surface mounting surface, and which viewed from the other side of the blade is not the same. The use of the arbor or arbor sleeve of the present invention with a cutting blade having these characteristics results in the blade being mounted on the saw in only one orientation.

Abstract: A two-tier groove cutting circular saw blade includes a circular core having sectors defined in circumferentially spaced relation to one another along the periphery, and lands defined in circumferentially spaced relation to one another between the periphery and center of the core. Pluralities of outer and inner cutting segments are secured to the respective core sectors and lands. First and second pluralities of anti-undercut elements are defined on the core respectively between the center and periphery thereof and along the periphery thereof between preselected ones of the lands and sectors for defining first and second exit paths away from the inner and outer cutting segments for flow of material particles generated from the cutting of the groove and flushing of the groove by fluid coolant so as to reduce wear and undercutting of the core adjacent to the inner and outer cutting segments.

Abstract: A saw comprises a saw blade having an outer edge, and a diamond-containing coating carried on the outer edge of the saw blade, the saw blade being composed of a synthetic plastic reinforced with a fiber material composed of a plurality of fibers with a volume fraction of 30-70%.

Abstract: In the annular sawing of bars, in particular of semiconductor material, the ccurate fitting of the saw blade is of great importance. In the case of the conventional clamping systems, in which the saw blade is held on the machine rotary part by clamping forces exerted by means of a holding ring and is subjected to tension by means of an additional clamping ring, inadequate tensioning constancy is usually caused by the tensioning forces acting against the clamping forces. A tensioning behavior which is better in comparison can be achieved according to the invention by the tensioning forces being applied to the clamping ring by clamping elements releasably connected to the machine rotary part and consequently clamping forces and tensioning forces no longer being directed against one another. By the use of such clamping systems, longer saw blade service lives and higher sawing outputs can be achieved.

Abstract: A saw comprises a support such as a metallic disc-shaped blank and a working portion bonded to the periphery of the blank. The working portion comprises a mass of abrasive particles held in a polymeric matrix and has a bonding surface through which it is bonded to the support and a working surface. Examples of suitable polymeric matrices are rubber, polyurethane and nylon.

Abstract: An inside diameter blade has an annular plate and a layer of abrasive grains deposited on an internal circumferential portion of the annular plate. The thickness of the internal circumferential portion of the annular plate is set to no greater than 1/5,000 of its outer diameter. The tensile strength of the annular plate is set to no less than 230 kgf/mm.sup.2.

Abstract: An improved annular cutting disc of the type having an inner annular edge as the cutting edge. The disc is comprised of a thin, metallic core member upon which a coating which is a slurry of nickel and diamond particles is plated and is the cutting coating. The coating extends radially inwardly from the inner wall of the core member towards the axis of the annular cutting disc to provide the cutting edge thereof. The cutting edge of the coating has a greater axial extent than the axial extent of the coating of the radial outward extent thereof. The coating defines a pair of axially extending shoulders at the radial outward extent upon which a coolant may impinge to reduce deleterious thermal effects. If desired, a first coating of nickel may be plated intermediate the cutting coating and the core member.

Abstract: A two-tier groove cutting circular saw blade includes a circular middle core having sectors defined about the periphery, a pair of side cores disposed adjacent opposite surfaces of the middle core and having lands defined about their outer peripheries, and pluralities of outer and inner cutting segments are secured to the respective middle core sectors and side core lands. Each side core is smaller in diameter than the middle core such that the side core lands and inner cutting segments secured thereon are displaced radially inwardly from the middle core sectors and outer cutting segments secured thereon, thereby adapting the blade for cutting a narrow lower tier and a wider upper tier of the two-tier groove. The blade also includes core anti-undercut features provided on the middle and side cores at predetermined locations thereon for defining exit paths for flow of material particles generated from the cutting of the groove and flushing of the groove by fluid coolant.

Abstract: This invention relates to devices for sawing hard material such as stone, and includes extenders to be affixed to the peripheral surfaces of a sawing core. Each has vertical sidewalls which are spaced-apart from each other by top and bottom spacer elements. The cavity created thereby opens to the front (i.e., in the direction of travel of the core when in use) and to the rear of the extender. The bottom of the cavity, which is formed by the upper surface of the bottom spacer element, inclines upward toward the rear to deflect water that has been sprayed onto the device to lubricate, cool and clean it, onto the next succeeding extenders and their associated cutting surfaces. The top spacer element receives a slideably replaceable cutting member base from said front direction, that may have a U-shaped mounting base and has a matrix element affixed to its top that is adapted to provide desired cutting surfaces.

Abstract: A rotating cutting blade and its drive motor are mounted on a wheeled support platform. The blade extends through a skid plate depending from the platform, in order to cut the concrete below the skid plate. The slot in the skid plate has its ends configured to fit within predetermined distances of the corresponding ends of cutting segments on the cutting blade. The cutting segments are configured to have a generally inverted "T" configuration in which a central cutting segment extends radially outward from two cutting segments located on opposite sides of the central segment. The exterior edges of the cutting segments may be square or rounded. the juncture between the central and shoulder segments may be square or rounded. The concrete is advantageously cut before it hardens to 1200 psi, without the use of an added lubricant, or above that hardness with lubricant if the cutting plate is supported within a sufficiently close distance by a skid plate.

Abstract: An annular thin plate blade having a cutting edge at its inner periphery and a method of producing the thin plate blade in which an annular member made of polycrystalline diamond formed by vapor phase synthesis is provided at the inner periphery of the thin plate blade and the thin plate blade has a thickness of 20 to 300 .mu.m.

Abstract: In an inside grindstone and a washing method thereof, a plurality of concave cut-outs are arranged on both sides of a cutting-edge layer which is formed at an inner periphery of an annular substrate. Parts of abrasive grains at both sides of an outer periphery of the cutting-edge layer are smaller in projecting amount than parts of the abrasive grains on an inner periphery of the cutting-edge layer.The washing method comprises the step of blowing off shavings accumulated in the concave cut-outs, by abrasive liquid and jetting gas which are jetted toward the cutting-edge layer.

Abstract: The invention is directed to a cutter comprising, a base plate formed by bonding two sheets of thin ring member together, a plurality of projections formed thinner than the base plate on the peripheral edge thereof, an provided with holes and slits which are interposed therebetween, wires passing through the holes so as to connect the projection, and a ring-shaped cutting body including abrasive grains and formed around the projections so as to expose a portion of slits.Since the projections are formed thinner, abrasions easily take place thereon when the cutter is used. Furthermore, the cutting body at the slits is reinforced by the wires connecting the projections.Since the base plate is formed by bonding two ring members, it has a large strength as compared with the base plate used in the conventional cutter. Therefore, the base plate hardly breaks when using the cutter.

Abstract: A rotary blade has a rotary substrate with chips disposed about the outer edge of the substrate. The substrate further has two sets of semicircular slits. The first set of semicircular slits is disposed annularly about the rotary substrate on a circle coaxial with the center of rotation of the rotary blade. The semicircular slits open toward the center of rotation. The second set of semicircular slits are disposed on a circle inside of the circle of first slits. These slits open outwardly, thus blocking, at least partially, the first semicircular slits from the center of rotation. A filler material is filled into the semicircular slits, the slits thus providing a vibration damping effect. The chips may be attached to the outer edge of the rotary substrate by concave profiled cassette stands.

Abstract: A cutting saw includes a cutting saw plate formed by bonding two thin plates having an orbicular shape together. The thin plates are bonded together by bracing or silver-alloy brazing. In fact the cutting saw plate is formed as an assemblage of two thin plates. A sinter including abrasive is formed around the periphery of the cutting saw plate. The sinter is formed in zigzag fashion in the direction of its thickness.

Abstract: A diamond abrasive saw blade for the dry sawing or cutting of concrete, masonry or the like is disclosed. The saw blade comprises a flat, circular plate having a central mounting hole and having a diamond abrasive matrix rim on the outer periphery of the plate. The plate has a plurality of apertures therethrough spaced around the plate between the mounting hole and the diamond abrasive rim. A coating is applied to at least one face of the plate with this coating substantially filling the apertures for aiding in the securing of the coating to the plate. This coating includes abrasive particles with the thickness of the abrasive particles, the coating, and the plate being less than or equal to the thickness of the diamond abrasive matrix rim.A method of abrasively dry cutting or sawing of masonry or concrete utilizing such a saw blade is also disclosed.

Abstract: A cutting tool comprising a disk, on the periphery of which are mounted cutting segments. The cutting elements have grooves which extend over the entire height of each cutting segment and have channels discharging chip material in peripheral direction. The latter are in particular meander-shaped, zigzag-shaped or wave-shaped, with the cutting-segment surfaces being opposite one another conformingly parallel in such a manner that a full cross-sectional overlapping is assured in an axial direction. Side channels and/or V-channels can follow a center channel in order to also permit a lateral material discharge.

Abstract: An improved circular saw blade assembly for cutting in a single pass a two tier groove in a concrete areaway. The saw blade body having a first row of cutting elements in the form of a metallic matrices containing fragmented diamond particles secured to the blade body periphery. A plurality of cutting blocks formed of the same material as the cutting elements are positioned in a circular configuration intermediate the periphery and the center of the blade body. The cutting blocks are secured to the blade body so as to position the cutting faces on the cutting blocks on each side of the blade whereby the cutting faces coact to cut a groove in the concrete above and wider than the groove cut by the peripheral cutting elements.

Abstract: A cutter comprises a ring-shaped base plate. On the peripheral edge of the base plate there are formed a plurality of projections interposing slits therebetween. The projections are formed thinner than the base plate and provided with holes, through which wires are passed to connect the projections. Furthermore, around the projections, a ring-shaped cutting body is formed. The cutting body includes abrasive grains and is formed to expose a portion of slits.

Abstract: The invention relates to a circular saw blade of the sandwich-type, i.e. a blade comprising two steel discs (2, 3) on the periphery of which the cutting elements (5) of the blade are attached. In order to improve the vibration and noise damping properties of such blades an intermediate layer (4) of an energy-absorbing and solderable material is introduced between the discs and the discs are interconnected by soldering, preferably by means of a plurality of spot-like soldered joints (11), with said intermediate layer (4) serving as the solder. (FIG. 2).

Abstract: A method to be used for adjusting the radial deviation from the true runn position of the internal cutting edge of annular saw blades and an apparatus for carrying out the method. For this purpose, the radial deviation or out-of-true is first measured as a function of position. Subsequently, the saw blade is stretched as a function of position in a defined manner in order to compensate for the deviations from the specified value of the radial out-of-true as a function of position. The measuring and tensioning cycles are continued until the deviation from the specified value no longer exceeds a predetermined tolerance limit. Saw blades adjusted in this manner are characterized by long service lives and high cutting accuracy.