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If you are having difficulty manufacturing or burning small/thin rib electrodes or tapping electrodes, give copper-impregnated graphite a try. You still need to use the standard graphite machining conditions, but the copper that is infused into the material makes it easier to machine the electrode to form and prevent chipping during the milling/turning process. The copper also gives added rigidity to the graphite, thus reducing flexure of the electrode during orbiting. This flexure can cause uneven surface finishes and inaccurate cavities or parts. Copper-impregnated graphite is available from several manufacturers, including Poco, Toyo Tanso, Ibiden and others. For information on copper-impregnated graphite materials and applications, contact Single Source Technologies (SST) at www.singlesourcetech.com.

-Jeff