Abstract: A tool mountable on a high speed spindle of a CNC machine tool, operable to finish a side edge of a flat workpiece positioned directly on a support surface of the machine tool, generally consisting of a member having a shank portion removeably mountable on the spindle of the toolhead assembly of the machine, and a head section. The head section is provided with an annular side surface engageable with the side edge of a flat workpiece positioned directly on the support surface of the table of the machine. The annular surface also is provided with a profile corresponding to the profile of the side edge of the workpiece being finished, and abrasive particles bonded thereto.

Abstract: A cylindrical, abrasive grinding wheel having a cylindrical abrasive region with an abrasive surface at an outer circular band thereof. The abrasive region includes layers of abrasive particles. The layers of abrasive particles can be tilted with respect to an axis of rotation of the grinding wheel or they can such that grooving in the grinding wheel and a workpiece ground by the grinding wheel can be reduced. Alternatively, the abrasive region can be formed from a plurality of abrasive segments each having layers of abrasive particles. The layers of abrasive particles can be staggered in the direction of the axis of rotation from one segment to another. This can also reduce grooving in the grinding wheel and workpieces.

Abstract: An object of the invention is to provide a core drill for drilling a fine hole which can securely fix an abrasive grain to a core material, can finish to a predetermined diameter in a relatively easy manner, and can manufacture one having a superfine diameter about some &mgr;m, and a method of manufacturing the same. A core drill for drilling a fine hole in accordance with the invention for achieving the object is structured such as to drill a fine hole onto a work, or grind an inner diameter of the drilled fine hole to a predetermined shape, and characterized by bundling ceramics long fibers so as to make a core material, impregnating the core material with a molten synthetic resin so as to harden, and holding an abrasive grain by the synthetic resin.

Abstract: The invention relates to a diamond tip disk saw that does not vibrate during high-speed rotation, enhance the quality of the cut surface, and increase the durability of the saw. The diamond tip disk saw according to the invention comprises of a metal disk having a shaft hole and a plurality of diamond tips on both sides of the periphery. In between the shaft hole and the diamond tips, the saw is provided with a plurality of corrugations forming substantially sinusoidal waves on both sides of the saw. A greater efficiency is obtained when the corrugations are formed in a convex arc coming out of the disk surfaces.

Abstract: In a negative mould (1) closed by a lid (3), hard material abrasive grains (5) are nickel-attached to the peripheral inside surface. The negative mould (1) contains, in addition to the outside contour (4) of the tool to be manufactured, also the surfaces for the location bore (7) and the end face locations (7′) of the said tool. Subsequently the inner space of the negative mould (1) is completely filled with a casting mass (6) interspersed with solid particles (8) and the said mass allowed to harden. The mould (1) is removed by machining or etching. This process permits the inexpensive and economic manufacture of tools coated with hard material abrasive grains.

Abstract: A method and apparatus for knurling a workpiece in which the knurl pattern includes grooves of at least two different configurations. The apparatus includes a knurl wheel holder that allows angular rotation of the knurl wheel about the holder longitudinal axis while maintaining the knurl wheel point of contact on the longitudinal axis. The apparatus also includes a knurling wheel that includes teeth of at least two different configurations. Also disclosed is a method of molding a molded article with the knurled workpiece to impart the inverse of the knurl pattern onto the molded article, such a molded article, a method of forming a structured abrasive article with the molded article, and such an abrasive article.

Abstract: A method and apparatus for machining flat or planarizing a fire deck of a bimetallic engine block includes providing a grinding wheel by disposing a series of abrasive inserts at spaced locations along a circumference of a circular head, so that during rotation of the head, the inserts form a notional annular grinding ring. The head is preferably a conventional milling head and the inserts are sized and shaped to fit within receptacles adapted to receive conventional milling inserts. In an alternate embodiment, a second series of abrasive inserts may be disposed radially inward of the first series of inserts to form an inner notional annular grinding ring disposed concentrically with the outer ring. Inner and outer inserts preferably comprise a single layer of diamond abrasive brazed onto a metallic substrate.

Abstract: A grinding wheel for use in grinding glass, has an outer periphery of abrasive material secured to a body portion made of a lightweight material.

Abstract: A grinding wheel is provided for grinding the fire deck of an engine block. The grinding wheel, includes a first annular grinding element disposed concentrically with the wheel on a backing plate. The first annular grinding element includes a first abrasive component of either metal brazed single layer abrasive components or abrasive components comprising grain bonded in a porous matrix having about 55 to 80 volume percent interconnected porosity. The wheel preferably has a second annular grinding element disposed concentrically inward of the first annular grinding element. The first annular grinding element preferably comprises a single layer of relatively course diamond abrasive component brazed on a metallic substrate, while the second annular grinding element preferably comprises a single layer of relatively fine diamond abrasive components brazed on a similar substrate.

Abstract: An abrasive surface for cutting and grinding tools and having abrasive particles embedded in a filler material. The abrasive surface is bonded to the perimeter edge of a rigid hub and has a circumferential dimension and a width dimension. The abrasive surface is divided along both the circumferential dimension and the width dimension into a plurality of hard regions and soft regions. The hard regions wear more slowly that the soft regions and so different patterns of hard regions and soft regions produce different cutting profiles. A method for fabricating the abrasive surface includes forming a laminated sheet from a plurality of laminated layers. Each laminated layer includes at least a layer of soft, easily deformable material and a layer of abrasive particles. The layers of abrasive particles can be formed into staggered rows to form the pattern of hard regions and soft regions. The layers of the laminated layers are sintered together to form the laminated sheet from which the abrasive surface is cut.

Abstract: A toothed timing belt is produced from a belt blank utilizing an apparatus having a belt blank fixturing device for supporting the belt blank for selective indexable rotation about a first axis and a toothed grinding wheel rotatable about a second transverse axis and supported for movement across the width of the belt blank in a direction parallel to the first axis for cutting a series of circumferentially spaced transverse teeth into the belt blank. The belt blank is indexed with each pass of the grinding wheel until the entire belt has been provided with teeth. The toothed belt blank may then be severed about its periphery to provide a plurality of discrete timing belt members.

Abstract: A rotatably mounted tool for surface working of construction blocks, e.g. concrete or granite blocks, as well as roadways, incorporates a plurality of flat, planar surfaces which are circumferentially spaced apart around the outer, peripheral surface of the generally cylindrical tool drum. A plurality of abrasive mounting shoes are removably secured to the flat drum surfaces, with flat surfaces on the shoes evenly seated in conforming relation to the flat drum surfaces. Abrasive segments are selectively affixed to each mounting shoe in a desired number, size, and spacing to carry out the desired surface working operation, i.e., cutting grooves in road surfaces or smooth finishing concrete blocks. The arrangement and orientation of the abrasive mounting shoes on the tool drum may also be varied in order to achieve full work surface coverage for particular applications.

Abstract: An abrasive tool includes a steel core having at least one cutting face which is knurled to provide a uniform texture of recesses of predetermined size. A single layer of abrasive grain such as diamond, synthetic diamond, and/or cubic boron nitride having a grit size which is less than the predetermined size of the recesses is brazed onto the cutting face so that the single layer of abrasive grain follows the texture of the cutting face to facilitate coolant and swarf transport for improved tool life, power consumption and workpiece surface finish.

Abstract: A centrifugal rotational countersink reamer for three-dimensional bores, being comprised mainly of an axial screw typed spring and an encircling screw typed spring, the encircling screw typed spring loosely slips over and encircles the threads of the axial screw typed spring, one end of the axial screw typed spring forms a central rod mounted in a cylindrical seat, the countersink reamer is inserted and fixedly mounted on an electric or pneumatic hand tool or a claw on a drilling machine; then the countersink reamer can be inserted into a rough bore, the hand tool is activated to rotate the countersink reamer, thus the axial screw typed spring creates a centrifugal swivelling wiping action during rotation, the threads of the encircling screw typed spring form grinding blades to abrase during rotation rough edges, especially the rough edges in the rough bore or on the three-dimensional interior/exterior bore rims located in a narrow area which makes the rough edges hard to be accessed for grinding.

Abstract: A method is provided for machining the fire deck of an engine block. The method includes providing a grinding wheel having an outer annular grinding element disposed concentrically or the wheel may be provided with an inner annular grinding element disposed concentrically inward of an outer element. The outer element comprises a single layer of relatively coarse diamond abrasive brazed on a metallic substrate, while the inner element comprises a single layer of relatively fine diamond abrasive brazed on a similar substrate. The outer grinding element and the inner element if utilized, is formed as a discrete unit individually fastened to a backing plate to facilitate independent height adjustment of the elements relative the backing plate. The method further comprises orienting the grinding wheel with its axis of rotation at a predetermined oblique angle a relative the fire deck.

Abstract: A diamond-charged abrasive layer (3) of a grinding wheel has a convex profile over at least part of its length (L) in order to have greater resistance to wear. Also provided is a machine for grinding ophthalmic lenses which employs the grinding wheel.

Abstract: A polycrystalline diamond cutting element has a non-planar, non-linear interface between a substrate and a table. The substrate has one or more protrusions mounted on the surface of the substrate and in spaced relationship. Each protrusion has a generally curved shape such as a delta or triangular shape that extends from the center of the substrate toward the perimeter of the substrate. The depth of the groove between protrusions generally increases along the path toward the perimeter of the element. Similarly, the depth of each protrusion from groove to groove varies along the path toward the perimeter of the element. A thicker, superhard layer such as a diamond layer is provided toward the circle of the element to increase working life. The resulting cutting element is symmetrical about the central axis to alleviate the need for proper orientation of the cutting element during assembly into a drill bit. In another embodiment, a depression is used in place of the protrusion to form a substrate.

Abstract: An electrodeposited diamond wheel including a circular substrate having an attaching aperture formed at the center and a plurality of cooling apertures each formed at a predetermined distance from the attaching aperture in the outer circumferential direction and each at a predetermined pitch. Diamond abrasive particles are electrodeposited on the outer circumference of the circular substrate. Ridges and grooves are formed as corrugations on both surfaces of the circular disc, and diamond abrasive particles are electrodeposited on the outer circumference of the corrugations to form a cutting edge, the cutting edge being formed into a corrugated shape conforming to the substrate. The diamond wheel is suitable for cutting of a composite material of a heat-softening material and a reinforcing material.

Abstract: An abrasive tool for cutting extremely abrasive-resistant materials includes a novel, abrasive segment with a generally crenelated, rectangular appearance. The segment has a single piece vein of a primary abrasive and first bond material extending completely along the length of the segment. The vein transverses the width of the segment at least once in a non-linear path and alternately coincides with inner and outer faces. Gaps between the vein and the faces opposite the vein coincident faces are occupied by a second bond material, and optionally, a secondary abrasive, thus forming multiple, separated abrasive regions. The bottom surface of the segment is attached to a core at an operative perimeter which defines the cutting edge of the tool. The segment can be adapted to conform to the curvature of diverse cutting edges, and thus can be used in rotary and reciprocating saw blades and core drilling bits.

Abstract: A variable volume coolant system for delivering liquid coolant to the interface defined between a machine tool and a workpiece to be abraded to a desired size and curvature. A first conduit path is defined between a source of liquid coolant and a nozzle for delivering coolant to the gap defined between the machine tool and the workpiece; a second conduit path is also defined between the source of liquid coolant and the nozzle. A first valve, such as a solenoid valve, controls the flow of liquid coolant through the first conduit path, while a second valve performs the same function for the second conduit path. The first conduit path possesses a greater volume than the second conduit path. By selectively adjusting the first and second valves, a high volume flow of liquid coolant is maintained over most of the machining operation, while a greatly diminished, low volume flow is established toward the completion of the machining operation.

Abstract: The subject invention is a cutting disc having a plurality of radial slots connecting with the peripheral edge of the disc which form multiple tabs integrally mounted to the cutting disc with the tabs protruding outwardly from the peripheral edge of the cutting disc. There is at least one tab for each support segment located between directly adjacent radial slots. When fixedly mounting of the cutting segments into the support segments, the cutting segment is also fixed to a tab.

Abstract: A molded bonded abrasive grinding wheel adapted for relatively rough grinding operations is provided with a plurality of protuberances spaced in a predetermined pattern along the peripheral surface thereof and extending substantially orthogonally therefrom to define a textured grinding face. The protuberances are molded integrally with the grinding wheel and are formed by placing a perforated, or textured annular insert in a grinding wheel mold during molding wherein the insert is molded in-situ about the peripheral surface of the grinding wheel. The insert is removed from the peripheral surface after molding or during grinding to expose the protuberances defined by the perforations of the insert.

Abstract: A method of dressing a threaded grinding wheel comprising rotating the grinding wheel and dressing tool about their respective axes and bringing the tool into contact with a point on a flank of the grinding thread. The dressing tool is traversed along the width of the grinding wheel with the dressing tool maintaining contact with the point during the traversing to remove stock material at the point on the flank along the width of the grinding wheel. The method includes controlling the amount of stock material removed by the dressing tool during the traversing at the point whereby different amounts of stock may be removed in different axial sections along the grinding wheel width at the point thus varying the grinding profile at each section at the point of contact. The tool is traversed at successive points along the grinding thread profile to produce a different grinding profile at each section of the grinding wheel. A method of grinding spur and helical gears is also disclosed.

Abstract: A combined cutting/grinding tool comprises a grinding wheel with an exterior circumferential grinding surface for profiling an object surface of a product to be manufactured. The grinding surface includes an abrasive grit. A profile is formed in the grinding surface for grinding a corresponding profile into the object surface. A plurality of inserts are inserted into a plurality of slots formed in the grinding surface. A cutting portion of each insert extends radially and integrally outward from the grinding surface to cut detail into the object surface of the part to be manufactured.

Abstract: Textured indentations in the cutting surface of the core of a cutting tool are designed to accommodate a single layer of superabrasive grain. The superabrasive grain contained in these textured indentations is thereby oriented during metal bond brazing such that a cutting edge of the superabrasive grain is oriented outward from the plane of the cutting surface of the core. Enhanced bond life, cutting performance and tool life are achieved.

Abstract: A diamond drill consists of a core and a pair of abrasive diamond tips which are joined to constitute a diamond tip and core assembly in the form of a flat plate. The diamond tips have chamfering sections for providing a cutting blade of a diameter smaller than that of a cutting blade provided by finishing blade sections thereof. The chamfering sections can be used not only for chamfering an edge of a glass plate defining an opening but for cutting a non-circular opening. In another embodiment, an abrasive diamond ring is installed on a shank and used for chamfering an edge of a glass plate defining an opening or for cutting a non-circular opening having a small corner.

Abstract: There is disclosed a method for generating highly-accurate tooth surfaces of a globoid worm wheel without using a globoid worm hob. When generating tooth surfaces of a copper-alloy globoid worm wheel by grinding with an electro-deposition grinding tool including a cutting surface on which abrasive grains are embedded, the electro-deposition cutting tool then being finished to have the same tooth surfaces as a globoid worm which can engage with the globoid worm wheel, the generation of the tooth surfaces of the globoid worm wheel is carried out under such a condition that a maximum cutting depth of one abrasive grain is predetermined to be not more than a quarter of the average diameter of the abrasive grains.

Abstract: A grinding wheel for treating a surface of a power transmission belt/belt sleeve. The grinding wheel has a cylindrical body defining a rotational axis and having a circumferential outer surface with there being a plurality of abrading elements arranged in circumferentially spaced relationship on the outer surface of the body. Reliefs are provided between adjacent abrading elements. The invention further contemplates a method of treating a belt using the inventive grinding wheel.

Abstract: A grinding wheel for V-profiling ophthalmic lenses of various diameters, powers and thicknesses has a V-shaped groove circumferentially thereabout which defines a forward V surface and a rear V surface meeting at a nadir of the groove. A rear flat surface tapers outwardly in relation to an axis of rotation of the wheel from a rear edge of the rear V surface toward a rear face of the wheel. The forward V surface is of a first grinding aggressiveness, the rear V surface is of second grinding aggressiveness greater than the first grinding aggressiveness and the rear flat surface is of third grinding aggressiveness substantially greater than the second grinding aggressiveness. In a preferred embodiment, the wheel also has a forward flat surface tapering outwardly in relation to the axis of rotation of the wheel from a forward edge of the forward V surface toward a forward face of the wheel.

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: 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: 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 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 tool for producing crown wheels by means of a generating process comprises a disc which is rotatable about its axis, with machining elements which are provided on the periphery thereof and the cutting edges of which lie in the outer surface of a profile determining the shape of the teeth of a crown wheel to be produced with the tool, said profile extending essentially helically over the periphery of the disc.

Abstract: A cutting blade the core of which is generally tear-drop shaped in cross-section. The sides of the tear-drop shaped core form an included angle of not less than about 5 degrees (and typically not less than about 9 degrees), and abrasive is provided essentially on only the wide bottom surface of the core.

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: A grinding wheel assembly for grinding and sizing workpieces such as an elastomeric power transmission belt is provided that comprises a wheel member including an abrasive, annular outer surface, a pair of annular flange members detachably connectable to opposing sides of the wheel member for providing opposing annular flanges that circumscribe and radially extend beyond opposing sides of the outer surface of the wheel member, wherein each of the flanges includes an inner abrasive surface for sizing a workpiece which is substantially coarser than the abrasive surface on the outer surface of the wheel member.