oh yea, the frequency is still up for grabs, I haven’t found any definite data on it yet. I have been researching allot of machines, patents ect. But mostly they talk about wave form. I think the there needs to be time for the arc to extinguish which in my other projects having to do with high power High voltage discharges it would be somewhere around 20Khz but like I said I don’t know yet. Anyone able to lend an opinion on that is welcome. But on other facets of the issue the speed of cut would be theoretically proportionate to the frequency, the more sparks the more cut the more specific power. but there has to be a happy medium and since my hardware at the moment will do 100Khz with out to much of a problem I might just make it adjustable to that.