Re: [CAD_CAM_EDM_DRO] Re: LOOKING for homeshop EDM or its power supply?

Hi Luis:
Commercial sinker EDM requires a very expensive dielectric oil and
equally expensive electrode material.
I paid almost $500.00 just to fill my tank, and about $300.00 for a
tellurium copper plate 1" thick by 6" wide by 12" long.
The oil gets contaminated over time and needs to be disposed of...another
100 bucks or so.
If you get into graphite electrodes, your material cost is even higher, and
you need expensive dust management capability.
Maintenance on these machines is very expensive too...a new servo valve is
upwards of $2000.00.
But these tools can work miracles if you build injection molds.
I simply can't do without my machine anymore; it paid for itself on the
first mold I built with it.
With regard to your question about speed; EDM is not a fast process for
removing lots of metal.
My machine is very small...only 20 amps, but it can burn a slot 0.100" wide,
0.100" deep, and 1.0" long in about fifteen minutes on a coarse setting with
copper electrodes.
A heavier machine can improve on this a bit, but not all that much unless
the power supply is very sophisticated.
Modern CNC EDM's achieve their performance by continuously monitoring the
spark gap conditions and adjusting them on the fly, but they are very
expensive machines...hundreds of thousands of dollars for a high end
machine.

Cheers

Marcus

----- Original Message -----
From: "luisguillermo98" <luisguillermo98@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, July 15, 2003 8:01 PM
Subject: [CAD_CAM_EDM_DRO] Re: LOOKING for homeshop EDM or its power supply?


> Expensice to run? could tell me more about this? is it take a lot
> energy to run?. what about speed?
>
> Luis ..
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Marcus and Eva"
> <implmex@a...> wrote:
> > Hi Luis:
> > I just went out and bought one!!!
> > I looked at the plans from Robert Langlois in Home Shop Machinist (
> I still
> > have the compiled articles) and I decided that it would be cheaper
> to buy an
> > E-Bay special.
> > I was right, I think.
> > They are available for less than a CNC'ed Sherline.
> > Everyone is dumping their manual machines and going with CNC
> versions (those
> > who are still in business, given the way our manufacturing economy
> is being
> > gutted) so a manual machine can be picked up for incredibly low
> prices.
> > I've seen ones go for under $1000.00.
> > I can't buy the materials to make one for that!!!
> > A good one for the HSM is the Hansvedt 150 B; it's a nice little
> benchtop
> > machine with a very nice control for its time.
> > It is capable of good fine burns with copper electrodes (Trust
> me....you
> > don't want to get into machining graphite electrodes in an HSM
> environment).
> > Just be aware that EDM is expensive to run, and stinky.
> > Hydraulic machines are also quite noisy.
> > Cheers
> >
> > Marcus
> >
> > ----- Original Message -----
> > From: "luisguillermo98" <luisguillermo98@y...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Monday, July 14, 2003 7:08 AM
> > Subject: [CAD_CAM_EDM_DRO] LOOKING for homeshop EDM or its power
> supply?
> >
> >
> > > Has anyone know where to find EDM machines for the hobbist?. What
> is
> > > the difference between the power supply that comes with EDM
> machines
> > > and the normal power supply we know?. Is there any website in
> how to
> > > build one of this machines?
> > >
> > >
> > > Luis...
> > >
> > >
> > >
> > >
> > > Addresses:
> > > FAQ: http://www.ktmarketing.com/faq.html
> > > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> > >
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> wanliker@a...,
> > timg@k...
> > > Moderator: pentam@c... indigo_red@q... [Moderators]
> > > URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> > >
> > > 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
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> > > List Mom
> > > List Owner
> > >
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>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
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timg@...
> Moderator: pentam@... indigo_red@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> 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/
>
>