RE: Low cost Servo Controller

Oooh! An EDM Machine?? I've been planning on using my benchtop CNC mill for
cutting EDM electrodes and doing some EDM die-sinking. I've had a hard time
finding info on current, voltage, feedrates, g-code, etc. on how exactly to
EDM. There hasn't been much discussion on this since I joined the list (1-2
mo.), and I haven't had a chance to read ALL of the archives. Does anyone
have a good starting point or any experience in hobby-EDM? Jon Elson -
could you repost the info Frank from Holland mentioned?

Thanks,
Carlos Guillermo

> -----Original Message-----
> From: F. de Beer [mailto:f.debeer@...]
> Sent: Wednesday, September 15, 1999 5:53 PM
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: Re: [CAD_CAM_EDM_DRO] Low cost Servo Controller
>
>
> From: "F. de Beer" <f.debeer@...>
>
> Hello Jon,
>
> I have been quite a while lurking all the information about the low cost
> servo controller because i have plans to add a bridgeport mill to my
> homeshop and convert it to EMC.
> I have already made a stepper controlled mill but it is not stiff (strong)
> enough for cutting steel.
>
> Just like Bertho Boman I like to sign the non-disclosure and take
> a look at
> what you got.
>
> Frank
> Hilvarenbeek, Holland
>
>
> PS: Thanks for your information about building an EDM machine. I am still
> gathering information.
>
>
>
> ----- Oorspronkelijk bericht -----
> Van: Bertho Boman <boman@...>
> Aan: <CAD_CAM_EDM_DRO@onelist.com>
> Verzonden: woensdag 15 september 1999 4:09
> Onderwerp: Re: [CAD_CAM_EDM_DRO] Low cost Servo Controller
>
>
> > From: Bertho Boman <boman@...>
> >
> > Hello Jon,
> > I like to sign the non-disclosure and take a look at what you got.
> >
> > I like your operating mode and wish you best of luck.
> >
> > Bertho Boman
> > =======================================
> >
> > From: Jon Elson <jmelson@...
> >
> > > I have let a group of people use my design, and after signing a
> non-disclosure
> > > agreement, I send schematics, board layouts, circuit theory
> and tune-up
> > > procedures. I think for the next batch, I'm going to raise
> prices just
> a
> > > little, to cover the mailing costs, which I underestimated the first
> time
> > > around. So, the board, with some small components that would
> be hard to
> > > get in small quantity, plus a pot core transformer and wire to wind it
> with
> > > will go fo US $64 each. The total cost, including these parts, should
> come
> > > to a little under US $200 per amp. Nothing is really very
> expensive in
> > > there, but it all just adds up. There are 3 CMOS digital ICs, about 5
> > > assorted op-amps, 2 LED bar graphs and their drivers, 2 FET driver
> > > chips and 4 power FETS. I usually use IRF640s, but depending on
> > > voltage and current requirements, others could be used. You could
> > > also use IGBT transistors, although lowering the PWM frequency might
> > > be required for them. I usually use 100 KHz as the PWM freq.
> > > just to keep the filter components small.
> > >
> > > The whole amp fits on a 4.5 x 6" (115 x 150 mm) circuit card, with
> > > small stamped sheet metal heat sinks for the transistors.
> > >
> > > Jon
> >
> >
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> ------------------------------------------------------------------------
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for
> the discussion of shop built systems in the above catagories.
> To Unsubscribe, read archives, change to or from digest.
> Go to: http://www.onelist.com/isregistered.cgi
> Log on, and you will go to Member Center, and you can make changes there.
> For the FAQ, go to http://www.ktmarketing.com/faq.html
> bill,
> List Manager
>