An abrasive rotary tool includes a tool shank defining an axis of rotation for the rotary tool, and an abrasive external working surface. The abrasive external working surface includes a resin, and a plurality of porous ceramic abrasive composites dispersed in the resin, the porous ceramic abrasive composites including individual abrasive particles dispersed in a porous ceramic matrix. At least a portion of the porous ceramic matrix comprises glassy ceramic material. A ratio of the average porous ceramic abrasive composite size to the average individual abrasive particle size is no greater than 15 to 1.

An abrasive rotary tool includes a tool shank a flexible planar section positioned opposite the tool shank. The flexible planar section forms a first abrasive external surface on a first side of the flexible planar section and a second abrasive external surface on a second side of the flexible planar section. The flexible planar section facilitates abrading, corners of a workpiece across multiple angles relative to the axis of rotation for the rotary tool through bending of the flexible planar section when the abrasive external surfaces are applied to a corner of the workpiece.

A method is disclosed for maintaining a hard surface, the method comprising treating the surface with a flexible pad (1), in the presence of abrasive particles, bonded to the pad, on a contact surface between the pad (1) and the hard surface. The abrasive particles comprise diamond particles, and the treating is performed in the absence of an effective amount of crystallization agent on the contact surface. A tool for use in the method is also provided, as well as a floor surfacing machine comprising such a tool and a method for manufacturing such a tool.

A polishing machine is described in which a surface treatment tool is moved across the surface of a workpiece in accordance with a predefined tool-path, in order to carry out the desired treatment process. The tool-path is non-periodic and preferably pseudo-random. Various techniques are described for generating data representing the tool-path to be followed. A technique is also described for determining optimum control parameters used to control the polishing machine for a given tool-path. The surface treatment may be a shaping technique in which material is removed from the surface, or a technique for adding material to the surface of the workpiece, or a technique for modifying the surface or a region under the surface of the workpiece.

A polishing machine is described in which a surface treatment tool is moved across the surface of a workpiece in accordance with a predefined tool-path, in order to carry out the desired treatment process. The tool-path is non-periodic and preferably pseudo-random. Various techniques are described for generating data representing the tool-path to be followed. A technique is also described for determining optimum control parameters used to control the polishing machine for a given tool-path. The surface treatment may be a shaping technique in which material is removed from the surface, or a technique for adding material to the surface of the workpiece, or a technique for modifying the surface or a region under the surface of the workpiece.

An abrasive article and method of making same wherein the abrasive article comprises a mounting assembly and an abrasive attachment assembly wherein the first interlock member of the mounting assembly and the second interlock member of the abrasive attachment assembly are configured to align the central axis of the abrasive attachment assembly and the central axis of the mounting assembly, and the first interlock member releasably engages the second interlock member. The abrasive article is adapted to clean a work surface area around studs using a rotary tool, including, for example, a drills or die grinder.

A lapping device is provided that is capable of precisely lapping a surface of an object having a complicated shape, the lapping device including a driving unit, a shank connected to the driving unit through a driving shaft, and a lapping portion coupled to the shank. The lapping portion includes an abrasive layer and an elastic member between the abrasive layer and the shank.

An abrasive article including a disc including a central axis; a primary outer edge substantially coaxial with the central axis and having a circumferential length, L.sub.1; a secondary outer edge substantially coaxial with the central axis and coplanar with the primary outer edge, the secondary outer edge having a circumferential length, L.sub.2, wherein L.sub.2 is less than L.sub.1; and a structurally weakened portion extending substantially adjacent to the secondary outer edge. In an embodiment, the abrasive article further includes a shedable portion configured to rupture the structurally weakened portion when the shedable portion is removed from the abrasive disc. In another aspect, an abrasive article having an initial outer circumferential length, L.sub.I, and a length of deliberately exposable circumferential edge surface, L.sub.OE, wherein L.sub.OE is greater than L.sub.I.

Polishing pad for use with high-speed mechanical buffers or for use by hand. More specifically, a polishing pad and methods of use for the polishing pad, the polishing pad having a foam pad, and having a cloth, a foam, or both attached to a top surface of the foam pad, with the cloth, the foam, or both covering part of the top surface of the foam pad such that gaps in the coverage allow for the foam pad and either the cloth, the foam, or both to touch a polishing surface at the same time.

Polishing pad for use with high-speed mechanical buffers or for use by hand. More specifically, a sloped polishing pad and methods of use for the polishing pad, the sloped polishing pad having a sloped foam pad, and having a cloth, a foam, or both attached to a top surface of the foam pad, with the cloth, the foam, or both covering part of the top surface of the sloped foam pad such that gaps in the coverage allow for the sloped foam pad and either the cloth, the foam, or both to touch a polishing surface at the same time.