Re: [CAD_CAM_EDM_DRO] Re: EDM home brew units ?

You are still dealing with the removal of mass. You need
energy to do this. You also still have inertia. Whether you
are removing metal with a cold chiesel, a hacksaw, a cutting
torch, or whatever, you are prying small bits of metal away
from larger bits of metal.

I think a lot of what you are concerned about is more about
accuracy and finish than just the removal of metal. An Arc
Air will cut just about anything a plasma or EDM will cut. But,
the speed of the Arc Air will be faster than the EDM. The accuracy
and finish of the ARC Air will be pretty course.

So, how much metal do you want to remove?
How fast do you want to remove it?
What accuracy are you looking for?
What finish are you looking for?

You are talking about wire EDM and not sinker EDM???

bob mcknight



To: CAD_CAM_EDM_DRO@yahoogroups.com
From: "turbulatordude" <dave_mucha@...>
Date sent: Sun, 30 Oct 2005 19:48:09 -0000
Subject: [CAD_CAM_EDM_DRO] Re: EDM home brew
units ?
Send reply to: CAD_CAM_EDM_DRO@yahoogroups.com

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--- In CAD_CAM_EDM_DRO@yahoogroups.com, "agerooo12000"
<agerooo12000@y...> wrote:

>
> > I think the real next phase is more electronics and more actual
> > control over the spark, (Warp Drive an not Impuse engines) not just
> a
> > larger transformer.
> >
> >
> > Dave
> >
>
> That is where my interest lies. I'm just on the wrong side of the
> electronic curve. I'm still thinking in mechanical terms of ICs as
> building blocks that work together similarly to any other mechanical
> system. ie. motor to transmission to universal, to movement. Timer
> chip to 4017 to transistor, to LED array. I know just enough ohms
> law to be dangerous. I also figured that a 20a power supply would
> make more waste heat than swarf if I kept with the RC circuit.
>
> Langlois talked about experimenting with cross shot astable times for
> duty cycles, but doing further research, I found out that at anything
> over 1kz the system becomes unstable (what I've read, not first hand
> experience). This brings up the questions:
>
> Is (up to) 1kz good enough, or do I want to pursue higher frequencies?
>
> If I want to pursue higher frequency duty cycles, where is a good
> place to look for circuits?
>
> With a modern duty cycle circuit, is 20a over kill? If not, is there
> a rule of thumb regarding amps to square inches of graphite?
>
> Thanks,
>
> Bill

There is a formual that relates surface area to amps. more amps
allows a larger surface area. more amps in a smaller area does not
offer any benifits.

At some point, you no longer spark, but arc and then the process is
lost.

An active circuit to charge and spark is desired. no reason why one
could not have 3 caps, each discharging in a round robbin fashion
while the others are being charged.


Dave

>
> Wait til you hear all the driver questions I have for a "cheap" home
> brew mini mill. Mechanicals are a snap... 12" x 8" x 2"
> capability... <--- Quick, get a camera. The boy is out of his cage.
>

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