Re: [CAD_CAM_EDM_DRO] Re: Question fro Jon Elson

Hi, yea watch the beryllium,it is poisonous,check with a chemist before
using ber/coper stuff. We used to machine the stuff and i know if you grind
it and breath the dust it will poison you! cul brian f.

----- Original Message -----
From: <thscarince@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, July 26, 2001 3:12 PM
Subject: [CAD_CAM_EDM_DRO] Re: Question fro Jon Elson


> Ah Ha!
>
> Out of curiosity I searched McMaster-Carr to see if they might have
> copper hex stock (electrode by the foot!). They don't, but they do
> carry *beryllium* copper hex wrenches for non-sparking applications.
>
> No idea if the beryllium would be a problem...
>
> BTW, I was captivated by Jon's junkbox EDM setup! Is that really all
> there is to it? Does EDM require short pulses or a continuous arc
> like a welder? Does polarity matter? How about AC? What properties
> are make a good electrode material?
>
> Any good links for the real nitty-gritty theory of EDM?
>
> Tom Scarince
>
> > > > I wonder if a hex shaped path could be programmed to cut a
> > > > hole through the stud for an allen wrench to extract it.
> > >
> > > You can EDM about any straight sided shape. The electrode shape
> > > can be sunk into the metal. Thus, if you have a hex shaped
> > > carbon/copper electrode, the EDM will produce that shape. No
> > > programming needed.
> >
> > For a one-off, you could even use an old allen wrench as the
> > electrode!
>
>
>
>
>
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