What does the term Overcut refer to in EDM machining?

The term "Overcut" in EDM (Electrical Discharge Machining) specifically refers to the size difference between the electrode and the cavity created in the workpiece. In the EDM process, the electrode does not exactly match the dimensions of the final cavity; instead, the cavity is often larger than the electrode due to the effects of dielectric fluid and the spark mechanism. This overcut is necessary to ensure that the electrode can effectively machine the desired shape and size, accounting for factors such as material removal and the energy dispersement during the sparking process. Understanding overcut is essential for accurately producing components to meet design tolerances, especially in intricate parts where precision is critical.