Home › Blog › Buying Guide › What Do Buyers Look for Before Investing in a Pre-Owned, Used, Secondhand, Surplus CNC Equipment Before Purchase Makino EDGE3 CNC EDM Die Sinking Machine made in Japan When considering a pre-owned / used / surplus Makino EDGE3 (or EDGE3i / EDGE3S family) sinker EDM (die sinking EDM), buyers must inspect many subsystems, because EDM machines are complex, precision systems with numerous interdependent parts (electrical, mechanics, dielectric/fluid systems, control, electrodes, thermal stability)....