A camming member is disposed on a threaded arbor and is provided with a first face having at least one inclined surface. A first face of a reinforcing plate is disposed in abutting relationship to the first face of the camming member and is provided with at least one inclined surface corresponding to the at least one inclined surface of the camming member. A second face of the reinforcing plate abuts a first face of an abrasive disc or wheel. At least one of the second face of the reinforcing pl...

Delamination-resistant abrasive belts and discs suitable for offhand and automated article finishing comprise a lofty, non-woven, three-dimensional abrasive web adhesively bonded to a stretch-resistant woven fabric with a polyurethane binder comprising the reaction product of poly-1,4 oxybutylene) glycol diisocyanate having a molecular weight of about 500-4000 and a reactive compound capable of reacting with the isocyanate radicals. The reactive compound is selected from a group consisting of wa...

A cubic boron nitride compact is bonded to a cemented carbide support through an alloy bonding layer which contains 40 to 70 percent by weight silver, gold or a combination thereof and 1 to 10 percent by weight of a high melting metal selected from the group of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium and molybdenum. Bonding may be achieved by first metallizing a surface of the cubic boron nitride compact with a layer of gold or silver or a gold or silver based alloy a...

An abrasive wheel comprised of abrasive granules dispersed throughout and adhered in a matrix with a binder system which comprises a blend of a tough adherent binder and a smear-reducing quantity of a smear-reducing compatible polymer. An abrasive wheel having abrasive granules adhered by the binder without the compatible polymer has a tendency to smear onto the surface of a workpiece when rotated thereagainst under heat-generating conditions such as high wheel to workpiece pressure and surface ...

In a method of removing second phase from an abrasive compact, the invention provides the improvement of forming a hole in the compact prior to or during the removal step. The compact is typically a diamond compact having a cobalt second phase. The preferred removal method is by leaching using as a leach medium hydrochloric acid in the presence of a platinum group metal catalyst.

Apparatus for abrasively cleaning surfaces, such as of a ship's hull block, including the surface of at least one member which serves as a rail on which a carriage is mounted, the carriage having supporting rollers engaging the upper surface of the rail and stabilizing rollers engaging opposite sides of the rail. An abrasive-slinging device is adjustably supported on the carriage and is movable manually to direct abrasive as desired over the surfaces to be cleaned. Optionally, the carriage, or t...

A method of making aggregated diamond abrasive particles comprising forming a mixture of diamond abrasive particles and a powdered metal, heating the mixture to sinter the metal followed by cooling to produce a mass and crushing the mass to obtain the aggregated particles, characterized in that the particles are selected from Types A, B and C, as hereinafter defined, and mixtures thereof: Particles of Type A have the following characteristics: 1. A Friatest Index of about 70 to 90 for those part...

A machine for simultaneously surfacing the opposite faces of workpieces with abrasive belts wider than the workpieces, which includes mechanism for feeding workpieces of different thicknesses simultaneously, and centering mechanism for engaging the surfaces of the workpieces as they pass through the machine.

An abrasive sheet is disclosed which can be hand held or used with known abrasive devices, has longer abrasive life than existing abrasive sheets and has a novel attachment arrangement onto an abrasive support member. The abrasive sheet has abrasive material coated on one surface and a layer of resilient open-celled flexible foam on the other surface. The abrasive sheet may be used with a support member having a support surface with a multitude of fastening protuberances projecting from the supp...

A flexible grinding tool made up a synthetic resin impregnated fiberglass mat with a layer of abrasive grains attached to both surfaces of the mat by a synthetic resin binder containing short fibers of glass, asbestos, ceramic material or graphite therein.