I've been lurking in the cnc router forums for a while learning how to build my own creation but after reading a few threads about machining aluminium and it seems that the stability of even a metal framed diy router limits thier use as far as metals are concerned.
I've been looking into EDM a bit today and it looks like what I"m after. I downloaded the translated Russion EDM book from the 50's and they seem very simple from first impressions (no dout there not).
What I want to do is make a die-sinker, accuracy isn't that important since I don't have the funds for servo's and it'll be more of an experiment than a practical money making venture. I plan to use ACME threaded rod, small microstepped steppers and aluminium extrusion for the frame.
The rest of the process is what I have questions about.
Controlling the voltage and current is not a problem (My main background is electronics) as well as the motion control electronics so I can experiment quite easily.
My main worry is the tool itself.
What kind of materials should I be looking at?
How much will it corrode in relation to the workpiece (e.g for every 1cm^2 I take out of the workpiece it takes 1cm^2 off the tool... you don't have to be that specific though
)
Someone mention using deionised (distilled?) water as the dielectric in another thread. Will this work effectively? Kerosene looks a bit more dangerous to implement
Thanks
Matt
EDIT: spelling