There are three main categories in an EDM:

- The CNC system

- The electronics

- The fluid tank

I'm most comfortable with that electronics (that is kind of my thing), so I will start there.

The electronics can be broken up into two sections:

- The control side, and

- The power side

The power bit is the hard, industrial-trade-secret type thing that makes electrodes spark. I'm working on that, but I don't have a physical thing to show for it.

Here's what I have for control as of yet:

This will be hackish, and I've done many tens of hours on this and other parts already, so we're playing catch-up.

Left side: Transformer to 6-7VAC, full-wave rectifier, big cap, 7805 linear regulator

Right-to-left: PIC18F4320 microcontroller (one I had kicking around, a very beefy model ten years ago), dual 7-seg display that is no longer connected and I haven't finished desolder yet, a row of serial-to-parallel shift registers to drive LED displays in their new location, a row of not-fully-connected 2N2222 BJTs for motor drivers.

All of my control will be done in PIC, and I'll start keeping GitHub updatedish.