Abstract: A method of machining workpieces using a device (1) which has a rotating frame (4), at least two robots (3) which are provided at the rotating frame (4), and at least one first and one second workpiece positioner (2) which are provided at the rotating frame (4), wherein the method comprises the following steps: placing at least one first workpiece into a first workpiece positioner (2); and machining the first workpiece by the robot or robots (3) and simultaneously rotating the rotating frame (4).

Abstract: The present invention relates to a control device for pressure control in a hydraulic system, especially of an elevator-system, the control device is adapted to control an output variable of an inverter supplying a hydraulic pump of the hydraulic system with electric energy, the output variable is adapted to adjust the speed of the hydraulic pump in order to at least partly compensate for a leakage of operating fluid in the hydraulic pump. Further, the invention relates to an elevator-system that includes a hydraulic pump, an inverter, and a control device which controls a supply of the hydraulic pump with electric energy from the inverter.

Abstract: The present invention relates to a control device for pressure control in a hydraulic system, especially of an elevator-system, the control device is adapted to control an output variable of an inverter supplying a hydraulic pump of the hydraulic system with electric energy, the output variable is adapted to adjust the speed of the hydraulic pump in order to at least partly compensate for a leakage of operating fluid in the hydraulic pump. Further, the invention relates to an elevator-system comprising a hydraulic pump, an inverter, and a control device which controls a supply of the hydraulic pump with electric energy from the inverter.