Die sink EDM is based on an electrode that sinks into the workpiece material: hence its name.
This electrode (usually of graphite or copper) first has to be manufactured,
for example by milling, spark EDM, turning or grinding.
The electrode is the negative image of the form to be made.
A cylindrical electrode is used to produce a round hole. Most electrodes have a more complex shape.
Die sink EDM is often used to produce moulds for injection moulding processes, but it is also an interesting technology for producing parts or high-precision components, such as square or hexagonal holes,
or the machining of hardened steel and hardened steel parts.