Re: [CAD_CAM_EDM_DRO] Simple EDM schematics...

Hey Lee,
If you just need to get one tap out it wouldn't be practical to try the HSM plans. That's about a 2 week project and the book
is about 50 pages, not very practical to scan.
I would say a "traditional" broken tap removal would get you there before building your own, unless you can get a loaner.
By traditional I mean,
1. tap removal tool
2. hole saw, plug and re drill. Some call this a trepanning drill.
3. knock it out with a punch, re-drill, plug hole
4. weld something on the end if there's any sticking out
5. borrow somebody elses sinker EDM
Good Luck

Lee Studley wrote:

> Hi all,
> Does anyone have some schematics for simple homemade EDM. I have Jon's
> and would like to see others also.
>
> Maybe a scanned version of that Home Machinist magazine's article?
>
> Yes, I broke a brittle tap off in an aluminum piece I made yesterday.
> I rigged up a setup like Jons, but overlooked the EDM cap on the
> output side of the series resister (Duhhh!). So needless to say I
> whatched it make little sparks with no real material removal
> for some time.
>
> I used light spindle oil as the electrolyte, and a syringe needle,
> since it was already insulated at the base. I had a 30V 10amp supply
> and a 250 watt 8 ohm dummy load for the series R. This was all stuff
> handy for a quick 5 minute setup attempt.
>
> Going to try again tonight.
>
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