Producing fine finishes on EDMed surfaces has long been a goal, especially for mold and die shops that operate ram-type electrical discharge machines. Lately, there has been renewed interest in using additives in the dielectric oil to achieve ultra fine finishes with graphite electrodes without excessive...
The whole industry seems to be discussing this topic. Here's what Modern Machine Shop has to say about additives solving EDM surface finish problems. ADDITIVE SOLVES EDM SURFACE FINISH PROBLEM DDM and HQSFTM Makino’s...