Apparatus and method for
erosion machining a structure comprising one of a metallic
structural component, a metallic insert element, and a connecting element, by way of
erosion. The apparatus includes an eroding head including an
electrode, a power supply, and a control device. The power supply and the control device produce an
erosion current. A grounding device is arranged in an area of the eroding head and includes at least one
contact element. When the eroding head is arranged to perform erosion
machining, the at least one
contact element contacts and forms an
electrical connection with a surface of the structure, whereby an eroding electric circuit is formed via the
electrode and the structure. The method includes arranging the erosion head in an area of the connecting element, sealing, with a seal, a flushing cage to the
structural component, contacting a portion the connecting element with the
electrode; and electrically connecting the at least one
contact element and another portion of the connecting element. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.