Hole drilling EDM

As the name implies, Hole drilling EDM (or small hole drilling EDM) is used to machine holes. However, this technique can accurately machine extremely small and deep holes that don’t require deburring compared to traditional hole drilling methods.

This method also uses the same fundamental principles as die-sinking EDM. However, the cut is made with a pulsing cylindrical electrode with dielectric liquid fed into the cutting area while moving deeper into the workpiece.

This method has been key to the advancement of high-temperature turbine blades, as it allows for very intricate cooling channels to be manufactured inside the turbine blades.