The invention relates to a grinding machine, which is suitable for a robot-supported grinding process. According to one embodiment, the grinding machine has a housing, a motor arranged in the interior of the housing, a fan wheel arranged on a motor shaft of the motor in the interior of the housing, and a support plate coupled to the motor shaft for receiving a grinding disc. The support plate has openings for intake of grinding dust into the interior of the housing. The grinding machine furthermore has an outlet arranged in a wall of the housing for exhausting the grinding dust out of the interior of the housing and a non-rerun valve arranged in the wall of the housing. The non-return valve enables an to escape from the interior of the housing, but prevents intake of air into the interior of the housing.

The disclosure provides abrasive rotary tools with enhanced adhesion of an abrasive layer. Exemplary abrasive rotary tools include a securing element configured to secure an abrasive layer to an abrasive rotary tool. The securing element may be positioned over a portion of the abrasive layer, such as a tab or end, such that repeated forces on the abrasive layer do not decouple the abrasive layer from the rotary tool. In this way, an abrasive rotary tool may maintain a contact surface integrity through repeated use for extended life of the rotary tool.

The disclosure provides abrasive rotary tools with enhanced adhesion of an abrasive layer. Exemplary abrasive rotary tools include a securing element configured to secure an abrasive layer to an abrasive rotary tool. The securing element may be positioned over a portion of the abrasive layer, such as a tab or end, such that repeated forces on the abrasive layer do not decouple the abrasive layer from the rotary tool. In this way, an abrasive rotary tool may maintain a contact surface integrity through repeated use for extended life of the rotary tool.

A tool driver for a power trowel, the tool driver comprising a combination of a magnetic fastening arrangement and a friction based fastening arrangement for releasably holding an abrasive tool to the tool driver, wherein the magnetic fastening arrangement is configured symmetrically around a rotational center of the tool driver, wherein the friction based fastening arrangement is adapted to provide increased shear strength during abrasive operation of the tool, and wherein the magnetic fastening arrangement is adapted to provide increased pull strength during lifting of the tool driver.

The presented solution discloses conduit arrangements in an intermediate pad (20, 100), a backing pad (10, 200) and an abrading article (300, 400). The conduit arrangements enable controlled conveyance of air onto and extraction of air and debris from the surface of an intermediate pad (20, 100), a backing pad (10, 200) and an abrading article (300, 400). The presented solution is an intermediate pad (20, 100) suitable for use in an abrading system. The presented solution is an abrading system comprising an intermediate pad (20, 100). The presented solution is a backing pad (10, 200) suitable for use in an abrading apparatus (1). The presented solution is an abrading system comprising a backing pad (10, 200). The presented solution is an abrading article (300, 400) suitable for use in an abrading system. The presented solution is an abrading system comprising an abrading article (300, 400). The presented solution further relates to methods of using an abrading system for extracting abrading debris.

The presented solution discloses conduit arrangements in an intermediate pad (20, 100), a backing pad (10, 200) and an abrading article (300, 400). The conduit arrangements enable controlled conveyance of air onto and extraction of air and debris from the surface of an intermediate pad (20, 100), a backing pad (10, 200) and an abrading article (300, 400). The presented solution is an intermediate pad (20, 100) suitable for use in an abrading system. The presented solution is an abrading system comprising an intermediate pad (20, 100). The presented solution is a backing pad (10, 200) suitable for use in an abrading apparatus (1). The presented solution is an abrading system comprising a backing pad (10, 200). The presented solution is an abrading article (300, 400) suitable for use in an abrading system. The presented solution is an abrading system comprising an abrading article (300, 400). The presented solution further relates to methods of using an abrading system for extracting abrading debris.

A backerplate for a portable drywall sander hub assembly includes a mounting portion and a backerplate body. The mounting portion includes a threaded bore adapted to couple the backerplate to a sander hub. The backerplate body is connected to the mounting portion. The backerplate body forms a plurality of apertures therein positioned radially between an outer circumference of the backerplate body and the mounting portion. The plurality of apertures are adapted for dust to pass therethrough during operation of a drywall sander with the backerplate mounted thereto.

A sanding pad (40) for a sanding machine (15), including comprising a drive holder (49), situated on the machine side (41) of the sanding pad, to be fastened in a non-rotatable manner to a drive (26) of the sanding machine (15), such that the sanding pad (40) can be driven by the sanding machine in an in particular rotational and/or eccentric sanding motion that is suitable for sanding a workpiece (W); wherein the sanding pad has a machining side (42), which is opposite the machine side (41) and has a machining face (45) on which a sanding means (90) for abrasive machining of a workpiece (W) can be arranged so as to be fixed or removable using an adhesive layer (66); wherein inflow openings (48) for dust-laden dirty air (S) to flow in are situated in the machining face (45), and outflow openings (43) fluidically connected to the inflow openings via through-channels (59) are situated on the machine side (41).

A sanding pad (40) for a sanding machine (15), including comprising a drive holder (49), situated on the machine side (41) of the sanding pad, to be fastened in a non-rotatable manner to a drive (26) of the sanding machine (15), such that the sanding pad (40) can be driven by the sanding machine in an in particular rotational and/or eccentric sanding motion that is suitable for sanding a workpiece (W); wherein the sanding pad has a machining side (42), which is opposite the machine side (41) and has a machining face (45) on which a sanding means (90) for abrasive machining of a workpiece (W) can be arranged so as to be fixed or removable using an adhesive layer (66); wherein inflow openings (48) for dust-laden dirty air (S) to flow in are situated in the machining face (45), and outflow openings (43) fluidically connected to the inflow openings via through-channels (59) are situated on the machine side (41).

A method for repositioning an abrasive disc within a repositionable abrasive disc mounting assembly is presented. The method includes mounting the abrasive disc to a repositionable abrasive disc mounting assembly in a first position. The mounting disc assembly includes the abrasive disc coupled to the back-up pad assembly such that the abrasive disc is in contact with a pressure feature of the back-up pad assembly, a drive shaft of a grinding tool, and a fastener that maintains the position of the abrasive disc and the back-up pad coupled to the drive shaft. The method also includes conducting an abrasive operation by activating the grinding tool. The method also includes re-positioning the abrasive disc, with respect to the repositionable abrasive disc mounting assembly, in a second position. The first position includes the abrasive disc in a first position relative to the pressure feature. The second position includes the abrasive disc in a second position relative to the pressure feature assembly. Re-positioning includes an adjustment between the first and second position while the abrasive disc is still positioned on the drive shaft between the fastener and the back-up pad assembly.