Abstract: Accessories for an angle grinder include a disposable rotary sanding disk having quite large shaped ventilating/viewing apertures, for use with a resilient backing plate also having shaped ventilating apertures. The apertures of one or both parts are shaped so that snagging of the apertures on projections from the work surface is minimized and to facilitate air flow across the work surface during use. This air flow helps in cooling the work and ejecting detritus, so minimising clogging effects. The ventilating apertures also facilitate viewing the work to be sanded through the spinning disk during the abrasion process, so that operator feedback is immediate. The holes also give the sanding disk more resilience so that a greater area comes in contact with the work and the disk wears more evenly over its abrasive surface.

Abstract: Coated abrasives comprising shaped structures deposited on a backing can be given increased versatility can be made by a process in which the shaped structure is imposed on a structure deposited in layers on the backing before the shaped structures are formed such that different characteristics are revealed as the structure is eroded during use.

Abstract: Accessories for an angle grinder include a tool comprising a rotary disk having releasably attached to its surface, an annular attachment having a cutting or abrading, (“shaping”), surface, and rest means in a rest zone for supporting the grinder on a surface to be shaped. The rest means may be a non-rotating nose beneath the grinder; a rubbing contact mounted on a flat tool or simply part of the surface of a convex tool. Tilting the grinder about the rest means gives effective control of the tool. Steeper tilts cause the cutting or abrading surface to bite more deeply into the surface to be shaped. The grinder is preferably stroked toward the user with the cutting or abrading zone trailing. Most disks are perforated. Work to be shaped can be seen through the spinning disk during use. The annular attachment can have a variety of cutting or abrading surfaces.

Abstract: The invention provides a useful tool for advising customers for abrasive tools on the selection of optimum grinding conditions for the use of a specific tool wherein the tool is in the form of a performance map generated from a plurality of data points obtained by measuring performance for a plurality of combinations of the two key grinding process variables.

Abstract: Locking devices for attaching an abrasive disk to a grinder are provided by a backup pad and lock nut combination wherein the mounting aperture of the backup pad is shaped to correspond to the exterior surface of the barrel of the lock nut, which is provided with at least two planar surfaces. This is particularly useful in securing correct alignment where the backup pad is intended to support an abrasive disk having a specific configuration that requires the disk and the backup pad to be aligned in a specific way.

Abstract: This invention describes a method of making abrasive products such as discs with enhanced resistance to deformation as a result of the influence of moisture by laminating a coated abrasive having a fibrous backing lacking dimensional stability when exposed to humidity to a secondary backing comprising an isotropic mat of fibers in a matrix of a polymer.

Abstract: The invention provides individually made abrasive discs with the primary abrasive surface around the periphery of the disc where the bulk of the abrading action occurs when the disc is in use. The invention also provides a process by which these discs can be made using a unique grain feeding technique which is capable of depositing abrasive grain on a backing surface accurately and in annular patterns.

Abstract: An optical polishing tool comprises alpha alumina and ceria components in relative weight proportions of from 30:70 to 70:30 dispersed in a resin binder. Particularly preferred are coated abrasives. Such coated abrasives produce an improved optical polishing performance.

Abstract: A method is provided for fabricating a self-lubricating bearing as a laminate of a metallic substrate and a series of raised structures formed integrally therewith and extending orthogonally therefrom. A fluoropolymer sliding or bearing layer is superposed with the substrate, with the raised structures embedded therein. The raised structures serve to hold the bearing layer in place to help prevent it from sliding along the surface of substrate during bearing operation. This anchorage to the substrate enables a relatively thick bearing layer to be utilized to relatively reduce tendency to creep. Alternatively, the structures provide a bearing fabricated according to the disclosed method having a relatively thin load bearing layer with a relatively constant friction coefficient over its life, with the structures acting as thermal and electrical bridges for relatively high heat and electrical conductivity between the substrate and a supported article such as a rotating shaft.

Abstract: A bonded-abrasive tool includes a matrix of an organic bond, abrasive grains dispersed in the organic bond and a grinding aid in the form of either an inorganic nonhalogenated filler or a hydrated filler. The inorganic nonhalogenated filler can react with free radicals released from the organic bond during grinding. The hydrated filler endothermically releases water. A coated-abrasive tool includes a flexible substrate, abrasive grains bonded to the flexible substrate, and an organic bond containing a grinding aid including an inorganic nonhalogenated filler or a hydrated filler coated on the substrate.

Abstract: A bond for a metal single layer abrasive tool can be easily chemically and electrochemically stripped from the metal core of a recovered used tool to facilitate reuse of the core. Relative to conventionally bonded tools, the speed of stripping the novel bond is quick, and the stripped core has a smooth, clean surface which needs only minimal mechanical repair prior to reuse. The composition of the novel bond consists essentially of copper, tin and titanium. It can be brazed at temperatures below diamond graphitization and is chemically compatible with diamond. Hence, the bond is particularly useful for the manufacture of large diameter, superabrasive metal single layer abrasive wheels employed in the construction industry. The bond can be applied to the cutting surface of the abrasive tool as a uniform mixture of bronze alloy, titanium compound and copper powders. The powders may be mixed with a liquid vehicle and applied as a paste.

Abstract: Accessories for an angle grinder include a rotary disk tool having a working zone around the periphery of the disk comprising a plurality of wire bristles and a rest means for supporting the grinder on a surface to be shaped. The rest means may be a non-rotating nose beneath the grinder, a rubbing contact mounted on a flat tool or simply the central part of a convex tool Tilting the grinder about the rest means gives effective control of the tool. Steeper tilts cause the cutting surface to bite more deeply into the work. The grinder is stroked toward the user with the cutting zone 2206 trailing. Most disks are perforated. Work to be shaped can be seen through the spinning disk during use. A tool base onto which a variety of cutting surfaces can be affixed is also provided, and a type of wire brush attachment incorporating a rubbing contact is provided.

Abstract: A drill bit is provided with a cylindrical body portion fabricated from a plastic material. The body portion is fastened in concentric, end to end relation to a cylindrical cutter fabricated from a metallic material and having an array of cutting elements disposed thereon. The body portion and cutter are preferably tubular, wherein the cutting elements are disposed in an annular array, to facilitate core or crown drilling operations. The wall thickness of the tubular body portion may be increased relative that of the cutter to compensate for wear during drilling. The tubular body portions also may fabricated from a composite polymer including wear resistant particles, whiskers, fibers and the like disposed on inner and outer surfaces of the polymer body, or dispersed throughout the body.

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 straight, thin, monolithic abrasive wheel formed of hard and rigid abrasive grains and a sintered bond including a metal component and an active metal component exhibits superior stiffness. The metal component can be selected from among many sinterable metal compositions. The active metal is a metal capable of reacting to form a bond with the abrasive grains at sintering conditions and is present in an amount effective to integrate the grains and sintered bond into a grain-reinforced composite. A diamond abrasive, copper/tin/titanium sintered bond abrasive wheel is preferred. Such a wheel is useful for abrading operations in the electronics industry, such as cutting silicon wafers and alumina-titanium carbide pucks. The stiffness of the novel abrasive wheels is higher than conventional straight monolithic wheels and therefore improved cutting precision and less chipping can be attained without increase of wheel thickness and concomitant increased kerf loss.

Abstract: A bond for a single layer metal bond abrasive tool can be easily chemically and electrochemically stripped from the metal core of a recovered used tool to facilitate reuse of the core. Relative to conventionally bonded tools, the speed of stripping the novel bond is quick, and the stripped core has a smooth, clean surface which needs only minimal mechanical repair prior to reuse. In one aspect, the novel bond is a quaternary bond composition consisting essentially of copper, tin, titanium and silver. The powder components can be used dry or mixed with a fugitive liquid binder as a paste. The novel bond can be brazed at lower temperature than copper/tin/titanium bonds prepared otherwise. The bond composition forms a good melt at braze temperature that flows smoothly, evenly over a tool preform and provides consistent quality bonding of abrasive from tool to tool.

Abstract: Production of a finished fabric backing for use in the production of a coated abrasive is performed using a dual cure system comprising a radiation curable binder and a thermal initiator in which polymerization is initiated by the use of radiation until the exotherm produced raises the temperature of the formulation to the activation temperature of the thermal initiator. Thereafter the polymerization continues under the influence of the thermal initiator alone.

Abstract: The invention provides a wire brush disc shaped grinder accessory that has segments removed from the circumference of the disc to provide visibility of the work surface while in use and with the bristles of the wire brush arranged in groups around the disc. It also provides a cup shaped wire brush tool wherein the bristles are arranged in groups. In this way both provide a cooler cutting action.

Abstract: Methods for orienting fibers and an apparatus for orienting fibers are provided for the fabrication of improved thin abrasive wheels utilizing uniform non-woven fiber reinforcement discs. The wheels are more resistant to hub push-out failure during grinding than wheels reinforced with woven fiber cloth.

Abstract: The invention describes an abrasive system comprising a fiber-backed abrasive disc and a backup pad in which the backup pad has spaced portions removed from the circumference such that the disc overlaps in the area of the removed portions. This has the effect of inhibiting catching of the disc on obstructions and enabling easy swarf removal during operation.