Abstract: A collection device (200) for collecting drill sludge (B) or dust created during the operation of a core drilling device is provided, the device having the following: an extraction unit (202) with a drilling opening (208) which extends through the extraction unit (202) and is designed to receive a drill bit, wherein the extraction unit (202) has a cavity which extends at least partially about the drilling opening (208), and at least one suction unit which is connected to the extraction unit and is designed to form a vacuum chamber conjointly with a surface, in particular wall or ceiling surface, wherein the vacuum chamber of the suction unit (204, 206) is fluidically separated from the cavity of the extraction unit (202).

Abstract: A water management system for providing cooling water and treating drilling slurry produced during operation of a core drilling machine, the water management system including the following: a collection device for collecting drilling slurry or dust produced during operation of a core drilling machine, the collection device having an extraction body with a drilling opening which extends through the extraction body and is designed to receive a drill bit; a treatment device for treating drilling slurry, the treatment device being fluidically connectable to the collection device in such a way that drilling slurry or dust, which is collected by the collection device, can be conveyed to the treatment device; and a vacuum pump, which is fluidically connectable to the collection device, wherein the water management system is designed in such a way that the vacuum pump can be releasably fastened either, in a first arrangement, to the collection device or, in a second arrangement, to the treatment device.

Abstract: In a method for checking a contour of a workpiece, a tactile switching touch probe with a shaped probe element is clamped in a machine tool and connected to a control facility. The touch probe is guided, preferably multiple times, with a different distance or different deflection of the touch probe, along a nominal contour of the workpiece. It is checked whether the touch probe generates a switching signal or loses a switching signal, indicating to a contour deviation. A machine tool and a simulation tool constructed as a digital twin are also disclosed. This enables a fast, simple and cost-effective check of the dimensional accuracy of workpieces machined or produced in the machine tool.

Abstract: A system for collecting drilling slurry generated during operation of a core drilling machine is provided, wherein the system includes a collection device as a functional unit, wherein the collection device is attachable to a substrate by a vacuum, wherein the vacuum can be generated by a vacuum pump which is part of a drive unit of the system. The drive unit additionally-includes a power supply unit for supplying electrical power to the drive unit and its components.

Abstract: A hand-held power tool, which has a pneumatic impact mechanism with an impact piston that is able to be moved back and forth along a working axis in a guide tube by a pneumatic spring, is characterized in that a cylindrical surface of the impact piston has a plurality of cutouts that are distributed in the circumferential direction, and the cutouts take up at least 30%, at least 50% and/or at least 70% of the circumference of the cylindrical surface of the impact piston.

Abstract: A control method for a percussive hand-held power tool (1) includes the steps: detecting a switching state of an operating button (12), detecting a temperature T using a temperature sensor (22), activating an electropneumatic striking mechanism (5) in response to an actuation of the operating button (12), an exciter (13) of the electropneumatic striking mechanism (5) being moved forward and backward along a working axis (3) at a repetition rate R, whereby a striker (14) coupled to the exciter (13) via a pneumatic chamber (16) is also moved. If the temperature T is greater than a limiting temperature Tc, the repetition rate R is continuously increased from idle up to a setpoint value (21). A duration until reaching the setpoint value (21) is less than 10 cycles. If the temperature T is less than the limiting temperature Tc, a duration until reaching the setpoint value (21) is greater than 200 cycles.

Abstract: In a method for checking a contour of a workpiece, a tactile switching touch probe with a shaped probe element is clamped in a machine tool and connected to a control facility. The touch probe is guided, preferably multiple times, with a different distance or different deflection of the touch probe, along a nominal contour of the workpiece. It is checked whether the touch probe generates a switching signal or loses a switching signal, indicating to a contour deviation. A machine tool and a simulation tool constructed as a digital twin are also disclosed. This enables a fast, simple and cost-effective check of the dimensional accuracy of workpieces machined or produced in the machine tool.

Abstract: A hand-held power tool, which has a pneumatic impact mechanism with an impact piston that is able to be moved back and forth along a working axis in a guide tube by a pneumatic spring, is characterized in that a cylindrical surface of the impact piston has a plurality of cutouts that are distributed in the circumferential direction, and the cutouts take up at least 30%, at least 50% and/or at least 70% of the circumference of the cylindrical surface of the impact piston.

Abstract: A handheld power tool includes a tool holder for holding a tool, an electric motor, a shaft connecting the tool holder and the electric motor, and a protective device for stopping the tool holder in an uncontrolled situation. The protective device includes a sensor for detecting the uncontrolled situation, a switchable current source and a normally closing magnetic brake. The switchable current source outputs a first current not equal to zero in response to signals of the sensor if an uncontrolled situation is not detected; the current source does not output a current or outputs a second current different from the first current if an uncontrolled situation is detected. The normally closing magnetic brake engages on the shaft and does not apply a torque to the shaft when energized by the first current. The normally closing magnetic brake applies a torque counteracting the rotational movement of the shaft when not energized or when energized by the second current.

Abstract: A handheld power tool includes a tool holder for holding a tool, an electric motor, a shaft connecting the tool holder and the electric motor, and a protective device for stopping the tool holder in an uncontrolled situation. The protective device includes a sensor for detecting the uncontrolled situation, a switchable current source and a normally closing magnetic brake. The switchable current source outputs a first current not equal to zero in response to signals of the sensor if an uncontrolled situation is not detected; the current source does not output a current or outputs a second current different from the first current if an uncontrolled situation is detected. The normally closing magnetic brake engages on the shaft and does not apply a torque to the shaft when energized by the first current. The normally closing magnetic brake applies a torque counteracting the rotational movement of the shaft when not energized or when energized by the second current.

Abstract: A control method for a percussive hand-held power tool (1) includes the steps: detecting a switching state of an operating button (12), detecting a temperature T using a temperature sensor (22), activating an electropneumatic striking mechanism (5) in response to an actuation of the operating button (12), an exciter (13) of the electropneumatic striking mechanism (5) being moved forward and backward along a working axis (3) at a repetition rate R, whereby a striker (14) coupled to the exciter (13) via a pneumatic chamber (16) is also moved. If the temperature T is greater than a limiting temperature Tc, the repetition rate R is continuously increased from idle up to a setpoint value (21). A duration until reaching the setpoint value (21) is less than 10 cycles. If the temperature T is less than the limiting temperature Tc, a duration until reaching the setpoint value (21) is greater than 200 cycles.

Abstract: A hand-held power tool, in particular a hammer drill or a combined hammer, includes a safety coupling via which torque transmission between a motor shaft and a transmission shaft of the hand-held power tool can be established and interrupted. The safety coupling includes a coupling part at the input end and a coupling part at the output end and can be actuated by a coupling actuator. Mutually complementary catch profiles, in particular similar to a crown gear set, by which the coupling part at the input end and the coupling part at the output end can be interlocked, are arranged on the coupling part at the input end and on the coupling part at the output end.