not really sure where you get your generator info from, but all of the edms that i service do not run above about 50khz....never heard of anything running in the megahertz range......
although the chinese have been making an edm system using low voltage and low current, (which may use higher frewuency) with a wire that spins back and forth off a steel drum. and it just flies back and forth....
they call it fastwire edm
what we normally think of wire edm they call slow wire edm.
the machine does not cut in di water, rather some synthetic oil mixed with water....
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