Dennis J. Murray wrote:
> 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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