EDMs abide by the principle of Electrolytic Corrosion to remove broken
taps,reamers, drills, screws and so on ,no direct contact, thus, no external
force and damage to the work piece; it also canmarking or dropping non
precision holes on conducting materials; small size and light weight,
shows its special superiority for large workpieces; working liquid is
ordinary tap water, economical and convenient.