Abstract: A method is provided for making improved molded abrasive tools by applying centifugal force and/or vibratory action to the abrasive particles during the molding operation. The abrasive is thereby forced and/or sifted preferentially into a closely packed surface layer with close conformity to the mold surface.

Abstract: A mechanism for imparting relative orbital motion to at least two associated driven elements. The driven elements are driven in an eccentric path, usually with a common drive axis, where the angular displacement of each such path is controlled while relative rotation of the driven elements is precluded.

Abstract: A process for chemically deburring a workpiece, comprising the steps of: coating the workpiece with a soluble masking material, allowing the masking material to pull away from sharp projections on the workpiece, such as burrs or edges, so that the sharp projections are thinly coated or not coated, exposing the coated workpiece to a corrosive solution so that the thinly or not coated sharp projections are chemically attacked by the corrosive solution, and stopping the chemical attack of the corrosive solution. These steps may be repeated, as necessary, until the sharp projections or burrs are removed or edges are sufficiently milled.