Re: [CAD_CAM_EDM_DRO] Re: "Light Bulb" EDM ???

mueller914 wrote:

>So what is my "safe" alternative for a DIY sinker EDM?
>
>The plans I've seen are for wire and I have no desire for that as of
>now.
>

FOr the power supply, I have made a slow, but functional EDM for burning
out small taps.
See http://pico-systems.com/edm.html for my info on that. For larger
jobs like your
exhaust studs, you could turn up the current a good deal.

But, it should be possible to drill these studs out to near the root
diameter of the threads,
and then pick the remaining metal apart in a few minutes. There are
special left-handed
drills for this purpose.

>>Be aware that this unit has no line isolation built in, and can be
>>
>>
>extremely
>
>
>>dangerous.
>>
>>

I would never use such a contraption, and I'm pretty blasé about such
hazards, usually.
At the very least, use an isolation transformer. But, I had much better
results with
about 30 V DC.

Jon