RE: [CAD_CAM_EDM_DRO] Re: stepper edm

Dave,

I don't know anything about EDM, but how about insulating the wire
electrode, except at the tip?

Alan KM6VV

> > <dave_mucha@> wrote:
>
> I was trying to remove a broken tap.
>
> the 3mm diameter copper wire (#12 ga) has a surface area of pi ^2 for
> the 3mm face. ( 7mm )
>
> at 3mm depth, the area is now, the face plus the outside diameer of
> the cylinder. 7mm plus 28 sq. mm
>
> That has a surface area of 7mm for just end cutting, or 35 sq mm when
> the electrode is just 3mm deep.
>
> What I noticed was that the surface darkened in a large section
> around the hole. This too lead me to believe the elctroloysys was
> draining away the energy.
>
> and, yes, it was water. working in a basement, I have very litle
> ventilation.
>
> Dave