1) A novel technique called double electrodes synchronous servo electrical discharge grinding (DESSEDG) is presented to machine non-conductive engineering ceramics with high efficiency and precision by integrating advantages of electrical discharge machining (EDM) and mechanical grinding. 2) In the DESSEDG process, a conductive grinding wheel rotates on the workpiece surface while a thin copper sheet electrode is automatically fed to the area where the wheel and workpiece meet, causing electrical discharges that erode the workpiece surface. 3) The eroded layer is then removed by the grinding wheel, combining the material removal of EDM with mechanical grinding for higher efficiency machining of hard non-conductive ceramics compared