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There are two main types of Electrical Discharge Machining (EDM) processes – wire EDM and sinker EDM, which are useful for cutting deep pockets and complex features such as gears and holes with a keyway.

During the sinker EDM process, the workpiece is immersed in a dielectric fluid. A metal electrode, known as the tool electrode, then initiates electrical discharge machining between itself and the workpiece. This discharge gradually erodes the surface of the workpiece, shaping it as designed.

Sinker EDM is typically used for manufacturing complex 3D shapes, such as molds, models, dies, and workpieces requiring high precision and surface smoothness.

Electrical Discharge Machining, also known as EDM, is a non-contact machining procedure used to make parts where material is removed from a workpiece using electrical spark erosion. EDM is good for more delicate projects as it does not exert cutting forces on the workpiece.