It is possiable to edm in a "no wear" setting. This is more like a minimal wear setting. It uses reverse polarity, electrode positive, work negative. With out knowing how accurate you need to be I can't say if this will work for you. You are on the right track by roughing as much as possiable before doing any burning. If conditions are right only a total of 10 electrodes would be needed for 8 cavities. 3 hits each, i.e. 3hits for the first cavity, throw the first one away, (or re dress), add one un worn hit for the next, etc. If you would like to discuss this e mail me at
jkupkey@mail.epowerc.net. sincerly; Tom Rogers,