Homebrew PCBs

Curt,
     Rather than say it won't work. I would suggest a copper
washer foot that rides on the PCB. This is the return contact.
The copper washer would ensure a return path for the EDM. 
The EDM electrode works within the hole in the copper washer.
On the down side, you might find thin traces are zapped away
like the element in a fuse! 

                                       John



--- In Homebrew_PCBs@y..., "curt_rxr" <rxr@f...> wrote:
> Hi list,
> 
>         Has anyone used EDM to cut the traces on a PCB?  You would 
> still have to drill through holes, but with surface mount parts the 
> number of holes would be limited.  Since EDM uses only minimal 
contact 
>  and no rotating parts the problems with rigidity are reduced and 
the 
> problems with quills go away.
> 
> CWR