No web site, but I can probably send you enough info to keep you happy 
for a day or two!! I wrote the code as a relative PIC newbie. Thus it 
isn't relocatable, which gives me heartburn now! It IS well-commented 
though! The PIC is a 16F628 and it controls the entire EDM operation, 
from applying electrode power, to sensing limit switch conditions, to 
the stepper motor (which controls the position of the electrode to 
maintain whatever gap voltage is desired).

It is NOT a wire EDM, but rather one that uses an electrode that punches 
though tough metal. For example: I've used it to punch square holes 
though carbide lathe tools and also holes though HSS (tool steel) for 
mounting hard cutters on relatively "soft" steel carrier shafts using 
cap screws. Also had to use it once to remove a stuck grade 8 1/4" set 
screw from an old jointer head. Wasn't fast, but WAS effective!

Email me off-line & I'll send you enough info & photos for you to make 
one yourself, if you so desire!

BTW: It works great!

Let me know!
Dennis

P.S.
I want to make changes to the code, but haven't done it yet. Right now, 
it needs a constant stream of "clean" water to flush out the debris. I 
use a very small fountain pump - you don't need much flow. I want to 
modify it to cycle the electrode up & down while immersed in the 
coolant, thus "self-flushing" the spark gap. That's necessary if you 
have a solid electrode and a deep hole. Usually I use a hollow electrode 
with coolant running thru the center down to the spark gap.

The "cycle" feature isn't a hard change, just haven't gotten around to it!





Peter Todd wrote:

>On Thu, Feb 02, 2006 at 12:35:10PM -0500, Dennis J. Murray wrote:
>  
>
>>- As a controller chip for a home-designed electrical discharge machine 
>>(EDM). Controls the stepper feed motor to maintain the selected 
>>current/voltage across the spark gap.
>>    
>>
>
>Love to hear more about that one, got a website on it?
>  
>
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