>>2933130
>spark / arc
With the inductive principle and the cap in place you will always be protected from arcing. Usually the supply voltage for the inductive design will be was too low to sustain and arc anyways but suppose for some reasom (mo powah babe) you went above 50V on the supply side the cap will still protect you from arcs as it only lets the transient pass and with the inductive process it's hard enough the way it is to store proper amounts of energy. You wont risk accidentially storing too much. Also the characteristic waveform of the discharge current is a very steep rise and gradual decline. Other way round than with caps.
When you do away with the cap you wil need a switch instead. So again: You get to decide the time when there definately won't be something flowing. If you tried it without the cap and switch you could not only short but also arc, if supply voltsge permits it. The coil would ionize thr gap and the PSU would just keep feeding it.
>Up to 20V
I think more even, usually and I think thry the limit is often given as total swing, like +20/-20 makes 40. Up to you if you then go +30/-10 or whatever. Same story for the driver.
>Wire vs sinker EDM
Well one use case is definately contouring. While the other is 'funny shaped cavity making'. I'd say drilling wonky holes but that's often actually a bad use case.
Conventionally machine the molds for pic related. Cant W-EDM it either. I guess sibker EDM it is.
Yeah I think the fact that you get to keep your entire electrode in ECM is really cool. Imagine you could use the process with a wire. No need to spool the wire. Bit I guess if you short, even on slurry, you will wear the tool.
Fucking transistor is still alive. Meh.