The deposit of copper in earth is abundant. And copper is a kind of nonferrous metal that relates closely with humankind, with good electrical conductivity, thermal conductivity, extensibility, corrosion resistance and abrasive resistance. CNC machining copper parts are used widely in all walks of life, like electricity, electronics, energy, petrochemical, mechanics, metallurgy, automobile and emerging industries. In China, the consumption of copper is only second to aluminum.