Re: [CAD_CAM_EDM_DRO] Re: Commercial EDM capacitance ranges

Easco 200 amp EDM supply.

later,
Larry Edington

----- Original Message -----
From: <davemucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, February 10, 2003 9:26 PM
Subject: [CAD_CAM_EDM_DRO] 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:
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> Addresses:
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> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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