EDM, short for Electrical Discharge Machining, is a non-contact, high-precision material removal process also known as spark erosion. EDM is used to machine electrically conductive materials by means of controlled electrical discharges (sparks), making it ideal for complex shapes and hard-to-machine components.
How EDM works:
In EDM, material is removed through repeated, controlled spark discharges between an electrode and the workpiece, both submerged in a dielectric fluid (typically deionized water or oil). Each discharge creates a microscopic plasma explosion that melts and vaporizes a small portion of the material—without physical contact.
Key advantages of EDM:
- Extremely high precision and repeatability
- Capable of machining very hard materials (e.g. tool steel, tungsten carbide)
- Enables complex internal geometries and tight tolerances
- No mechanical stress on the part – ideal for delicate or thin-walled components
- Fine surface finishes and sharp edge definition
Common applications of EDM:
EDM is widely used across industries where precision machining is essential:
- Tool and mold making (e.g. injection molds, die inserts)
- Medical devices (e.g. surgical instruments, micro-components)
- Aerospace (e.g. turbine blades, fuel system parts)
- Automotive engineering (e.g. precision fuel injectors, transmission parts)
- Watchmaking and micro-mechanics
EDM process types:
- Wire EDM – uses a thin, continuously fed wire electrode for cutting contours
- Sinker EDM – uses shaped electrodes to erode complex cavities
- Hole drilling EDM – for very small, deep holes in hard materials
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