A method for protecting a user of a power tool from the effects of a suddenly occurring imbalance, and to a power tool having a disk-shaped tool for carrying out the method. The power tool has at least one acceleration sensor which is configured to detect vibrations which occur during the operation of the power tool. The vibration values determined can be evaluated and compared with specified limit values, wherein the power tool can be switched off if the vibration values exceed a corresponding limit value. By switching off the power tool, which can be achieved in various ways, the power tool affords optimum user protection against the effects of a suddenly occurring imbalance that may occur, for example, in the event of a defective tool of the power tool.

An abrasive tool comprises an arbor having a body formed with an internal bore, a mounting plate disposed on the arbor, a cover plate, an abrasive article disposed between the mounting plate and the cover plate, and at least one internal resilient member disposed within the internal bore of the arbor.

A sanding system is presented that includes a tool with a motor which, when actuated, drives movement of a drive shaft. The system also includes a backup pad coupled to the drive shaft. The backup pad is configured to receive an abrasive article. Movement of the drive shaft causes movement of the abrasive article. The system also includes a compliant damping unit configured to provide variable compliance for the tool when the abrasive article contacting a worksurface. The system also includes an electronic controller that receives a system operating condition and sends a signal to the compliant damping unit based on the system operating condition.

A hand-held/hand-guided random orbital polishing/sanding power tool has a static body and a motor for driving an eccentric element with a rotational movement about a first rotational axis, and a plate-like backing pad rotatably connected to the eccentric element about a second rotational axis. The first/second axes extend parallel to and spaced apart from one another. Part of an external circumferential surface of the eccentric element has a rotational symmetry re the first axis to form a rotationally symmetric part. The tool has a first bearing between the rotationally symmetric part and the static body so the eccentric element is rotatably guided re the static body about the first axis, and also having a mechanical gear arrangement with two meshing gear wheels arranged between the motor's drive shaft and the eccentric element, and one meshing gear wheel attached to the eccentric element for transmitting torque thereto.

An attachment for a mobile handling device is configured for processing walls or ceilings. The attachment comprises a mounting unit that is arranged to be supported at a mounting interface of the handling device, a processing head that is arranged to be equipped with at least one tool for material-removing processing or smoothing processing, and a compensation arrangement that is arranged between the mounting unit and the processing head and that defines a longitudinal axis. The mounting unit provides at least two pivot positions for the attachment that are offset from one another. The processing head is movable relative to the mounting unit in a longitudinal direction along the longitudinal axis. The compensation arrangement is configured to provide a defined contact pressure force for the processing head in a defined operating range along the longitudinal axis towards the surface to be processed.

A method of conducting a material removal operation using a grinding system including moving an abrasive article relative to a workpiece, detecting a change in a dimension of the abrasive article during moving, and reducing resonance vibrations in the grinding system.

An improved robotic tool buffering system flexibly suspends a finishing tool from a robotic arm while providing substantially constant compression pressure using use. The buffering system includes a robotic arm interface attached to a robotic arm, a finishing tool interface attached to a surface finishing tool, and a plurality of compressible mechanical buffer assemblies. The buffer assemblies provide substantially constant compression pressure between the finishing tool and a target surface, and also provide a substantially level orientation of the finishing tool relative to the target surface. Each buffer assembly includes a coupler, a hollow compressible buffer and an axial stop.

A machining apparatus for a curved plate includes a holder that holds a main surface of a curved plate having curved surfaces on both main surfaces; a machining device that machines an outer circumference of the curved plate held by the holder; a movable frame that retains the machining device; a driver that moves the movable frame to move a machining point of the curved plate held by the holder; a controller that controls the driver; and a guide that guides the movable frame along the outer circumference of the curved plate held by the holder.

A random orbit sander includes a housing and a motor enclosed within the housing. The motor includes a motor shaft that is rotatable about a first axis. An eccentric carrier coupled to the motor shaft includes a circular internal bore that defines a second axis that is offset from the motor shaft. A bearing is received within the circular internal bore of the eccentric carrier. A sanding pad is supported by the bearing and is rotatable about the first axis in an eccentrically orbiting manner. The motor shaft and the eccentric carrier are integrally formed as a single piece.

An attachment for a mobile handling device is configured for processing walls or ceilings. The attachment comprises a mounting unit that is arranged to be supported at a mounting interface of the handling device, a processing head that is arranged to be equipped with at least one tool for material-removing processing or smoothing processing, and a compensation arrangement that is arranged between the mounting unit and the processing head and that defines a longitudinal axis. The mounting unit provides at least two pivot positions for the attachment that are offset from one another. The processing head is movable relative to the mounting unit in a longitudinal direction along the longitudinal axis. The compensation arrangement is configured to provide a defined contact pressure force for the processing head in a defined operating range along the longitudinal axis towards the surface to be processed.