Possible practical uses for your EDM. I don't know much about EDM but more than 30 yrs ago I had an Evinrude OBM that I was overhauling and many of the S/S bolts were completely seized into the alloy and sheared off. The solution was to use a portable EDM machine to erode the stainless bolt from the alloy. If I remember rightly, a dam of Plasticine was built around the sheared off stud, it was filled with fluid and the EDM ate away all the stainless and left the alloy threads intact. I never did work out how it managed to do that without destroying the alloy. A colleague did the work for me and for about a year the machine had some intermittent use doing similar work, and then I never heard of it being used again in the next 30 years. Today they tend to machine out studs like this and perhaps fit Helicoils, but at the time it was a good solution to my problem.