A grinding tool drivable in rotation about an axis of rotation, including: an abrasive band which is wound spirally with a plurality of superimposed layers about the axis of rotation and has a grinding layer on a band side facing away from the axis of rotation, characterized in that the wound abrasive band is, viewed in a longitudinal section along the axis of rotation, convexly curved with respect to the axis of rotation and the layers of the abrasive band reach radially into one another. Furthermore, the disclosure relates to a method for manufacturing a grinding tool.

A grinding tool includes a substrate having a surface provided with a plurality of openings, and a plurality of grinding studs. Each of the grinding studs includes a stud portion and an abrasive particle attached to each other, the stud portions being respectively attached into the openings, and the abrasive particles protruding outward from the surface, each of the abrasive particles having a pattern cut across a tip thereof to define multiple apexes adjacent to one another.

A grinding tool includes a substrate having a surface provided with a plurality of openings, and a plurality of grinding studs. Each of the grinding studs includes a stud portion and an abrasive particle attached to each other, the stud portions being respectively attached into the openings, and the abrasive particles protruding outward from the surface, each of the abrasive particles having a pattern cut across a tip thereof to define multiple apexes adjacent to one another. In some embodiments, methods of fabricating a grinding tool are also described.

A rotary tool containing a core hub with helical groove on its outer surface filled in with continuous abrasive filament formed by folding of a pre-cut abrasive sheet including multiple bristle like straps extending radially from the hub. The method of manufacturing includes the steps of providing a hub, and forming a helical groove with inverted V-shaped cross-section along its cylindrical surface. An abrasive element is wound around the hub so that the folded edge is fed in the V-grove and is buckled inside the groove providing, along with securing it by sufficient pre-tension of the abrasive element, a secure anchoring of the abrasive element through locking of the buckled edge. The abrasive filament is formed from a roll of abrasive cloth as one continuous piece using a cutting operation and is provided with center-line perforations. These perforations assist folding the filament by providing it with discrete and desired flexibility as well as weakening it in such way that it assists the process of folded edge buckling inside the groove during winding and therefore forms a tight anchoring junction with the hub without need for an adhesive.