The invention relates to a device (100) for the grinding and/or polishing of planar surfaces, comprising a grinding and/or polishing tool (20), a frame (40), a workpiece (32) or a holder (30) for at least one workpiece, and a means (10) for moving the frame and the workpiece holder (30) with the workpiece, characterized in that the device (100) is set up in such a way that a loose bearing is formed between the workpiece (32) or the workpiece holder (30) and the frame (40), and the means (10) for moving the frame (40) and the workpiece (32) or the workpiece holder (30, 30′) with the at least one workpiece (32) is configured in such a way that the workpiece (32) or the workpiece holder (30) with the at least one workpiece (32) is guided in a plane which is predetermined by the surfaces of the at least one workpiece (32) resting on the grinding and/or polishing tool (20).

The invention also relates to a method for the polishing of planar optics by using the device (100).

In an angle electric power tool 1 in which an output axis P intersects and is orthogonal to a motor axis J, a battery attachment portion 40 is provided to the rear of a grip 30 so as to extend in the rearward direction and a battery pack 50 is configured to be attached to an upper surface of said battery attachment portion 40. Because of this configuration, the battery pack 50 does not directly come into contact with a working surface W, thereby preventing flaws and scratches on the working surface W.

A tool for shaping an abradable liner of a turbofan engine is disclosed. The turbofan engine includes a shaft to support a fan rotatable about a rotation axis. The abradable liner is configured to surround the fan and has an axial length in the direction of the rotation axis. The tool includes a support configured to be mounted to the shaft and rotatable about the rotation axis. The shaping head is mounted to the support for rotation about the rotation axis and configured to shape the abradable liner by removing material from the abradable liner. A radial position of the shaping head is adjustable relative to the rotation axis. The shaping head may sized to extend substantially across the axial length of the abradable liner.

The invention relates to a machining device (1), in particular a CNC machining device, for machining preferably planar workpieces (W) that are preferably composed of wood, wood material, plastic, and/or glass at least in parts, comprising: a machining assembly, which has a dynamic element; a first guide assembly, by means of which the machining assembly can be moved in a spatial direction; and at least one vibration-damping device. Vibrations of the dynamic element (3) can be passively damped by means of the at least one vibration damper device.

A power tool includes a housing, an auxiliary handle, and a vibration damping assembly. The auxiliary handle includes a front end and a gripping portion. The vibration damping assembly includes a mass member and an elastic element. The auxiliary handle further includes an end cap arranged at a rear end of the gripping portion where the rear end is far away from the housing relative to a front end of the gripping portion. An accommodating cavity for accommodating the vibration damping assembly is formed around the gripping portion. The elastic element is arranged between a mass member and a cavity wall of the accommodating cavity. A ratio of a natural frequency W1 of the vibration damping assembly to a rotation frequency W2 of an output shaft in rotation is greater than or equal to 0.7 and less than or equal to 1.3.

The invention discloses an eccentric mechanism, comprising an eccentric block assembly and a weight structure and a heat dissipating component. The weight structure is used to balance the eccentric block assembly when rotating, so that the shaft passage one and the shaft passage two provided on the eccentric block are located on the same axis when the eccentric block assembly is rotated. And the heat dissipating component is connected with the eccentric block assembly, and is provided with an fan structure comprising a plurality of fan blade structures driven by a drive mechanism, wherein the heat dissipating component rotates synchronously with a working part, to dissipate heat for structural units.

There is also provided a power tool, comprising a housing mechanism, a driving mechanism, an output mechanism and a working component, the output mechanism comprising an output shaft and the eccentric mechanism described above, the output shaft has one end connected to the driving mechanism, the eccentric mechanism passing the rotating shaft and the working parts are connected. The power tool is provided with a heat dissipating mechanism to dissipate heat from the power tool, especially for working parts such as a grinding head and a polishing head, thereby greatly improving the service life of the tool and better protecting the product such as the surface medium of the automobile. The surface of the product is smoother.

An arrangement for cooling a spindle bearing or bearings of an abrading apparatus with rotating abrading members is disclosed. This is premised on arranging in the a housing of the abrading apparatus conduits which extend from a spindle bearing chamber wall of the housing to an inner suction chamber wall of the housing. Via such conduits, hot air may be expelled from a spindle bearing chamber of the housing as an overpressure in front of a protruding balancer element of a rotating shaft balancer is discharged from the spindle bearing chamber via a conduit into a suction chamber. Cool air may be conveyed from a suction chamber into the spindle bearing chamber as an underpressure behind the protruding balancer element draws in air from the suction chamber via the conduit to the spindle bearing chamber.

A grinder including a motor, a switch operated ON and OFF in accordance with an operation of a switch lever to control a rotation of an output shaft of the motor, a spindle that rotates in accordance with the rotation of the output shaft to rotate a disk-shaped grinding wheel and a brake mechanism controllable with respect to a brake plate that integrally rotates with the output shaft, in a housing, the brake plate includes fins.

A rectifier circuit for rectifying an AC voltage supplied from a commercial power supply into a DC voltage, a smoothing capacitor for smoothing the output of the rectifier circuit, and an electrically powered tool for supplying the smoothed pulsating DC voltage to a motor by an inverter circuit, wherein when the motor is driven while no load is being applied to a tip tool, the smoothed DC voltage repeatedly generates a maximal value and a minimum value so as to synchronize with the fluctuation in the AC voltage. During no-load rotation, control is performed so that driving is performed at a value that is less than a threshold value D.sub.1 for the duty ratio at which the generation of a gear sound starts in any of the speed dial setting values 1-6. It is thereby possible to suppress a gear sound generated by a power transmission mechanism during no-load rotation.

Methods and apparatus for a vibration dampening system having an adaptor with a user contact surface and a power tool contact surface. The adaptor can include a core to reduce vibration transfer from the tool to the hands of a user. In embodiments, the core comprises a viscoelastic material that lightens a base elastomer to form liquid-filled closed cells structures.