Die-sinking EDM

Die-sinking EDM, also known as sinker EDM or Die-sinking electro-erosion, is a type of electrical discharge machining (EDM) where a shaped electrode is used to erode material from a workpiece. The electrode is usually made of copper, graphite, or tungsten, and it is precisely shaped to the desired form of the cavity or feature in the workpiece. This process uses electrical discharges (sparks) to remove material from the surface in a controlled manner.

Die-sinking EDM is commonly used for making molds, dies, and complex geometries in hard materials that are difficult to machine using traditional methods. The key feature of this process is that the electrode does not touch the material directly; instead, it erodes the material through repeated electrical discharges in a dielectric fluid, typically oil or deionized water.