Gentlemen, We cheat. The edm uses through the spindle/tool flushing and dielectric oil. The electrode is a copper tube. The tube is not completely hollow. The tube has a web in the center of it. This allows it to remove the whole plug instead of leaving a core. You will have the same flushing problem with oil, water or air. I think you will probably get more agitation and flow with air. They all serve the same purpose. Use whatever you have and whatever works the best for you. thanks Stuart
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