Re: [CAD_CAM_EDM_DRO] Langlois's HSM EDM m/c question

Dave;
you can also see the series of articles by model engineering workshop
magazine on their spark erosion
machine it is based on the design by mr Langlois, and I
believe that even the pcb is available
regards from OZ
mariano

----- Original Message -----
From: "Dave Mitchell" <davem@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, July 23, 2001 8:47 PM
Subject: Re: [CAD_CAM_EDM_DRO] Langlois's HSM EDM m/c question


> "Ian Wright" <Ian@...> wrote:
> > Is this article part of the original series or is it a later follow-up.
If
> > the latter I have missed it - what extra benefit does it give?
>
> It was in part 6 of the original series, which consisted of
> outlines of extra bits of circuitry you might want to use - it included
> a circuit diagram, but no component values. One bit was limiter ciruitry -
> so it would stop when a microswitch indicated the end stop had been
reached.
> The other was a big transistor either side of the discharge capacitors,
> so you could alternately charge and dischage them, with variable frequency
> and duty cycle. This also means that the spark rate wasn't tied to 50/60
Hz.
> The article hinted that this gave better quality finish if you wanted to
> do something more than just burn out old studs. It also implied that
> the discharge capacitors could be made a lot smaller.
>
> Like the orignal poster, I'd be very interested to hear if anyone has
> built this 'advanced' model, what final circuit details they used,
> and what results were achieved.
>
> Dave M.
>
> PS - a big hello from Sheffield :-)
>
>
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