Re: [CAD_CAM_EDM_DRO] Simple EDM schematics...

That sounds like a good technique worth trying. I've got some aluinum parts
with #4-40 taps broken off still in them. Would be nice to be able to use
the tapped hole...since there isn't enough room to put in another hole.

How long does it take for a tap to disolve out?
Smoke

>one more technique: make a saturated solution of aluminum
>sulfate (or potassium aluminum sulfate = alum) at about 120 deg
>F. Put the workpiece in the solution with the broken tap
>submerged. Tap will disolve out. Goes quicker when hot but
>works when cold.
>
>Don't ask me how I know this work fine :-).
>
>JerryK