Knowing Ronal is understanding what EDM is.
Electrical Discharge Machining: cutting conductive material with electricity.
Conventional, stick, Sinker. In the vernacular of the trade, machining male electrodes to erode blind female cavities.
Precise, computer controlled upper and lower wire guides profile exact geometries. Smooth transition of star to diameter, for example.
Commonly know as HOLE POPPING. Drilling conductive material with very small diameter electrodes.