Electrical Discharge Machining (EDM) enables precision machining of conductive materials regardless of hardness. Three distinct technologies dominate industrial applications:

• Sinker EDM: Uses custom-shaped electrodes to create 3D cavities (±0.01mm accuracy; ideal for mold cores and turbine blades)

• Wire EDM: Employs continuously moving wire for 2D/tapered cuts (±0.001mm precision; optimal for tooling and medical instruments)

• Micro EDM: Utilizes rotating micro-electrodes (Ø0.03–0.3mm) for features down to 5μm (critical for fuel injectors and medical implants)
  Key differentiators include electrode configuration, dimensional capabilities, and surface finish requirements (Ra 0.05–0.2μm).