EDM's anyone running one of these machines. I became interested when researching how to make injection molds.

From what I can see there are two types ram/sinker and wire.

Both machines work by bruning/eroding away metal particle by particle. A wire edm wire cut through 12 inches of steel with amazing accuracy and a sinker will sink a copper elctrode shaped in any way into a sold block of hardened steel.

It looks like slow process but the results are amazing.