[Klox]

CAMmando,
The older edm machines with DC generators normally "battle" to cut materials (non ferrous alloys) out of the ordinary. For example you get discolouration when cutting tungsten & Ti. The newer AC generators cuts faster & better! I have read about "intelligent arcing adjustment" on new edm machines that keeps generator settings optimal and prevents the electrode from shorting out. Some machines have Digital dual voltage (high/low voltage). The current being synchronously discharged to ensure faster material removal rate, uniform suface finish & lower electrode wear.

I haven't come across PCD, if i have to cut it i would start out for settings for Ti/ tungsten and play around..........

Klox