Whenever it is neccessary to create complex structures in a mold such as round cavities, inscriptions or certain surface patterns, erosion is the
technology to be used. First a copper electrode with the desired shape is being manufactured. This electrode is then installed in an erosion machine. The mold insert that is supposed to be worked on is positioned under
the electrode. Step by step the electrode is now lowered into the material, while a sequence of electric dischargements slowly removes material from the mold surface. The final result is a perfect negative of the
electrode in the mold part.