Abstract: A rotary finishing tool and a method for making the same characterized by a rolled or coiled strap of plastic material with abrasive homogeneously embedded throughout. The coiled strap is secured to the bottom interior surface of a cup element by a thin layer of liquid quick setting or instant adhesive. The strap may include transverse slits or serrations to provide the degree of flexure desired and/or to provide fracture lines. To make the tool, a longitudinally extending strap of an abrasive containing plastic material is heated and rolled along its longitudinal axis thereby forming a lightly coiled strap. A cup element is supported and the coiled strap is driven into the cup element whereby one end face of the coiled strap is driven into contact with a thin layer of the instant adhesive. Upon curing of the adhesive, the one end face is secured to the bottom interior surface of the cup element, and the opposite or outer end face becomes the working face of the tool.

Abstract: An adhesive bonded flexible abrasive finishing tool and method of making the same includes a cup-shape shank of plastic or metal. Flexible nylon abrasive loaded monofilaments of uniform length are formed into a cylindrical bundle. A measured amount of liquid instant cyanoacrylate adhesive is placed into the bottom of the cup portion of the shank and the bundle of monofilaments is driven as a group endwise by a pressure plate through a split funnel mounted on the lip of the cup so that one end of the bundle and thus each monofilament is driven uniformly into the adhesive which then cures rapidly. The monofilaments may preferably be straight or somewhat crimped or wavy and may vary in sectional configuration and abrasive loading. The resulting brush or finishing tool is a low cost light weight tool having improved distribution and density of filaments and a flat even face without a final trimming operation. The tool is ideally suited for automated or robotics finishing operations.

Abstract: A method for trimming or dressing the filaments of abrasive finishing tools to an exact and uniform length to create a precision face by means of a rotatable turntable having a cutting surface upon which a finishing tool may be axially mounted and fixedly engaged. A circular cutting blade positionally adjustable relative to the filament ends, trims the filaments by cutting action of the blade in compressive contact with the filaments against a slightly yieldable cutting surface upon rotation of the turntable, the cutting blade counter rotating without power and being self-sharpened upon contact with the abrasive filaments.