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Posted by Andrew Mawson on June 11, 2008, 3:34 am
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> > Sorry, should have said, the Stuart casting is iron. As I frankly
> > didn't have a great deal of hope in the first instance I made very
> > little attempt to control anything - the wire was lodged in place
with
> > a dob of plasticine and a rubber band and tended to move about a
bit.
> > I would put in a bit more effort next time. After the first go it
was
> > immediately obvious that the finer the electrode, the finer 'hole'
> > you'd machine. Blindingly obvious really.......
> >
> > I was careful to cut the 'electrode' off flush with the insulation
so
> > that current could flow only out of the end and not radially.
Given
> > your situation of something you don't want to make worse, I'd try
with
> > a steel screw in any old bit of ally first.
> >
> > If you want to read a bit of technical stuff on the subject look
at
> >
this:http://www.osti.gov/energycitations/servlets/purl/15015141-slv9mp
/nat...
> >
> > It _is_ quite theoretical, but skipping through it picks up a fair
bit
> > of useful pointers.
> >
> > Richard
> >
> >
> >
> > >That sounds very promising. I have an aluminium air-raid siren
housing
> > >with broken off screws in it, waiting for an idea like this. What
metal
> > >is your Stuart casting made from?
> >
> > >Best wishes,
> >
> > >Chris
>
> Hi Richard
>
> What made you go for sea water - I thought the fluid should be non
> conductive?
>
> Tim
Yes that point made me think it was mainly electrolysis rather than
edm that disolved the tap. True EDM needs a dialectric that breaks
down releasing an explosive discharge, with a conducting electrolyte
that wouldn't happen.
AWEM
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> > didn't have a great deal of hope in the first instance I made very
> > little attempt to control anything - the wire was lodged in place