Abstract: In a control method for a hand-held power tool, a striking mechanism is driven with an electric motor, wherein an exciter piston of the pneumatic striking mechanism is driven periodically by the electric motor and a striking piston of the striking mechanism is coupled to the exciter piston via a pneumatic chamber. The method includes detecting the acceleration of a machine housing along a striking direction of the striking piston in different phases of the movement of the exciter piston; and controlling a rotational speed of an electric motor according to the detected acceleration in the different phases.

Abstract: A tool guide has a mounting, a lifting mechanism, and a chassis. The mounting is for fixing a hand-held machine tool. The mounting is mounted on the lifting mechanism. The lifting mechanism has a propulsion unit for vertically lifting the mounting. The chassis has two wheels on a wheel axle, a drive coupled with the wheels, and a steering system. The lifting mechanism is rigidly mounted on the chassis. A center of gravity sensor is arranged to detect a lateral deflection of the center of gravity of the lifting mechanism relative to the wheel axle. The steering system is configured to control the drive to deliver a torque counteracting the lateral deflection.

Abstract: A self-aligning tool guide has a holder for securing a portable power tool for working on a ceiling, a lifting mechanism, and a self-balancing chassis. The holder is mounted on the lifting mechanism. The lifting mechanism has a propulsion system for raising the holder parallel to a lifting axis. The self-balancing chassis has two wheels on a wheel axis and a drive coupled to the two wheels. A sensor serves for detecting a contact pressure of the holder, the contact pressure acting in the direction of gravitational force. The control station activates the propulsion system depending on the detected contact pressure.

Abstract: A control method for a hand-held power tool comprises: of driving a striking mechanism with an electric motor, wherein an exciter piston of the pneumatic striking mechanism is driven periodically by the electric motor and a striking piston of the striking mechanism is coupled to the exciter piston via a pneumatic chamber, detecting the acceleration of a machine housing along a striking direction of the striking piston in different phases of the movement of the exciter piston; and controlling a rotational speed of an electric motor according to the detected acceleration in the different phases.

Abstract: A self-aligning tool guide has a holder for securing a portable power tool for working on a ceiling, a lifting mechanism, and a self-balancing chassis. The holder is mounted on the lifting mechanism. The lifting mechanism has a propulsion system for raising the holder parallel to a lifting axis. The self-balancing chassis has two wheels on a wheel axis, a drive coupled to the two wheels, and a steering system. A contact sensor serves for detecting an indirect contact of the holder with the ceiling. The chassis has a brake. A controller has a mode in which the brake is activated and the balancing of the self-balancing chassis is deactivated.

Abstract: A sensor arrangement includes a sensor collar where the sensor collar has a sensor sleeve for insertion into an anchor hole and has a sensor flange which is fixedly connected to the sensor sleeve and which radially protrudes from the sensor sleeve for abutting on a mouth of the anchor hole. A through hole extends through the sensor sleeve and through the sensor flange. The sensor arrangement further includes a sensor where a physical quantity of the sensor flange is determinable by the sensor.

Abstract: A self-aligning tool guide has a holder for securing a portable power tool for working on a ceiling, a lifting mechanism, and a self-balancing chassis. The holder is mounted on the lifting mechanism. The lifting mechanism has a propulsion system for raising the holder parallel to a lifting axis. The self-balancing chassis has two wheels on a wheel axis, a drive coupled to the two wheels, and a steering system. A contact sensor serves for detecting an indirect contact of the holder with the ceiling. The chassis has a brake. A controller has a mode in which the brake is activated and the balancing of the self-balancing chassis is deactivated.

Abstract: A tool guide has a mounting, a lifting mechanism, and a chassis. The mounting is for fixing a hand-held machine tool. The mounting is mounted on the lifting mechanism. The lifting mechanism has a propulsion unit for vertically lifting the mounting. The chassis has two wheels on a wheel axle, a drive coupled with the wheels, and a steering system. The lifting mechanism is rigidly mounted on the chassis. A center of gravity sensor is arranged to detect a lateral deflection of the center of gravity of the lifting mechanism relative to the wheel axle. The steering system is configured to control the drive to deliver a torque counteracting the lateral deflection.

Abstract: A self-aligning tool guide has a holder for securing a portable power tool for working on a ceiling, a lifting mechanism, and a self-balancing chassis. The holder is mounted on the lifting mechanism. The lifting mechanism has a propulsion system for raising the holder parallel to a lifting axis. The self-balancing chassis has two wheels on a wheel axis and a drive coupled to the two wheels. A sensor serves for detecting a contact pressure of the holder, the contact pressure acting in the direction of gravitational force. The control station activates the propulsion system depending on the detected contact pressure.

Abstract: A tracking method is disclosed. The method determines the position of a mobile measuring station relative to a base station in an interior. The position of the mobile measuring station is ascertained on the basis of the image coordinates of at least three image points, the emission directions associated with the image points, and the respective distances of the base station from the wall in the associated emission directions.

Abstract: A tracking method is disclosed. The method determines the position of a location marked on a wall on the basis of image coordinates of a first image point, image coordinates of a second image point, the emission direction associated with the second image point, and the respective distances of the axis of a base station from the wall in the associated emission direction.

Abstract: A tracking method is disclosed. The method determines the position of a location marked on a wall on the basis of image coordinates of a first image point, image coordinates of a second image point, the emission direction associated with the second image point, and the respective distances of the axis of a base station from the wall in the associated emission direction.

Abstract: A tracking method is disclosed. The method determines the position of a mobile measuring station relative to a base station in an interior. The position of the mobile measuring station is ascertained on the basis of the image coordinates of at least three image points, the emission directions associated with the image points, and the respective distances of the base station from the wall in the associated emission directions.

Abstract: An installation method for an expansion anchor is carried out by repeatedly exerting rotary-percussive strikes onto the shank (2) of the expansion anchor (1) by an impact screwdriver. The repeat rate (Ntarget) of the rotary-percussive strikes is selected as a function of the tightening torque prescribed for expanding the expansion sleeve (3) of the expansion anchor (1). The impact screwdriver stops generating rotary-percussive strikes when the detected mean rotational speed (d) of the shank falls below a threshold value (D).

Abstract: In an anchor system, for example, an undercut anchor system, having an anchor bolt with an expansion element, preferably at least one engagement means for the purpose of bearing a load, an expansion sleeve surrounding the anchor bolt, a means for detecting an axial end position of the expansion sleeve on the expansion element when the expansion sleeve is expanded and moved axially, the axial end position of the expansion sleeve should be able to be detected precisely. This problem is solved in that the means has a sensor for the purpose of detecting the axial end position.