Re: [CAD_CAM_EDM_DRO] Re: Question fro Jon Elson

scott@... wrote:

> Will you give us details of your RC EDM circuit? I would like to see
> how it works.

Here's a link to a complete description of what I set up :
http://pico-systems.com/edm.html

R1 and C2 are the R and C of the spark generating circuit. When the
capacitor charges up to the voltage needed to break down the dielectric
in the tiny space between work and electrode, a high current discharge
develops for a few microseconds or so, discharging the cap until the
discharge can no longer be sustained. then, the process repeats.
When it works well, there is a steady but rough buzz, about a hundred
sparks per second. But, RC EDM systems are slow and very temperamental.
I think an electronic switching system would vastly improve things.
This is what is done in all commercial EDM systems.

Jon