Re: micro wire-edm project (and software solution)

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "JCullins"
<james_cullins@s...> wrote:

>
> What voltage and currents do most use for EDM ?
> Constant current is not hard to produce.
> Do you maintain given distance away from the material to be cut ?
>
> I guess I need to get a book on the subject.
> Jim

There are two beginners books.

Langolis has been around for a few years and is pretty good. He
rambles a lot and much of the book is haphazzard writing. It was very
hard to follow some of the ideas as it appeared he knew what he was
talking about so he didn't have to write it down.

But, if you can piece together the ideas he puts out, it does cover
the topic very well.

He did go into theory pretty well, and for some people, that is a nice
part. for others, it just confuses the matter.

The other book, Build and EDM by Ben Flemming is written in a
different manner. Ben wrote it almost as an instruction manual for a
plans set. Very straighforward in a more step by step approach.

I think he missed some of the details, but they are very easily filled
in my the average person.

There are two yahoo groups for EDM that I am aware of.

http://finance.groups.yahoo.com/group/EDM_CNC/

http://groups.yahoo.com/group/EDMHomeBuilders/

The second is Ben's list where he will answer questions about his book
and building and such.

In the first, there is a decent links and files section, so both are
worth visiting.

Hope that helps.

Dave

> ----- Original Message -----
> From: "Graham Stabler" <eexgs@n...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Friday, October 28, 2005 4:05 AM
> Subject: [CAD_CAM_EDM_DRO] Re: micro wire-edm project (and software
> solution)
>
>
> >
> >> A current sense resistor has to be able to handle the total current.
> >> diodes are cheap in comparison. They have a high voltage drop which
> >> is not always a good thing, but can make monitoring the current easy.
> >> But, did I mention they are cheap ?
> >>
> >
> > I am still a little confused as the voltage drop over a diode will be
> > its forward voltage and that is not normally very large. The voltage
> > drop will not be proportional to current and as you would still need
> > to limit the current you could use the current limiting resister.
> >
> >> Many of the low end RC EDM machines use them as the sense voltage
> > source.
> >
> > So they are not using them as a voltage references?
> >
> > I will probably measure gap voltage anyway to be quite honest and if I
> > were to use a shunt it could be a tiny value, at the low intended
> > currents it would not need to be all that big or expensive.
> >
> > Graham
> >
> >
> >
> >
> >
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