Re: Commercial EDM capacitance ranges

What was the origional use for the power supply ?



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Larry Edington"
<ledington@a...> wrote:

> I just bought a power supply that's supposed to weigh around 600

pounds.

> Just so I can
> take it apart and learn how it works. Being older technology I

figure I can

> replace a lot of the
> control circuits with a microcontroller or two. Or maybe a single

TI DSP.

>
> thanks,
> Larry Edington
>
> ----- Original Message -----
> From: "RichD" <cmsteam@s...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Monday, February 10, 2003 9:51 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Commercial EDM capacitance ranges
>
>
> > Larry,
> > I will try to answer best as I can.
> > Industrial machines are huge. I have repaired wire and plunge

units.

> > The manufacturers **refuse** to supply any internal docs.
> > Opening one of these up reveals an enormouse array of electronics.
> > Which capacitor?. There are many. I have never gotten to the

level of

> > knowlege (or needed to) to discover the output circuits.
> > All is computer controlled, in any case.
> > The water for the flushing thru the cut in the wire EDM is just

tap water

> > recirculated and filtered for use as the local water is very

mineral free.

> > It splashes about the work area and drains back into the 'dirty'

tank.

> > The plunge EDM is another matter and an entirely different

operation.

> > This must be submerged to control the intense sparking on

electrodes

> having
> > much larger surface areas than wire (.011" dia). Quenching fire

and smoke

> > as well as flushing movements are the usual method. A type of

orderless

> oil
> > is pumped into the well on startup and automatically drained on

stop.

> > Even so, a lot of fire is seen to erupt from under an electrode.
> > An occasional puff will make it to the surface.
> > RichD
> >
> > Larry Edington wrote:
> > >
> > > Anybody know the range of capacitance found in a typical

commercial wire

> and sinker EDM?
> > >
> > > What about the adjustability of the capacitance? How many

different

> steps are usually available?
> > >
> > > What about voltage? I've read 80 volts max is typical.
> > >
> > > I assume if you are doing active spark control, you just put in

enough

> capacitance to supply your longest
> > > spark time and limit down from there. I'm trying to determine

what those

> ranges are for spark time and max
> > > voltages.
> > >
> > > One more question ( for now ). Why is deionized water used in

wire EDM

> when an oil product is used for sinker EDM?
> > >
> > > thanks,
> > > Larry E.
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
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