RE: [CAD_CAM_EDM_DRO] Laser "route" Printed Circuit Boards

To inject a small reality check. I print a transparency on my inkjet, expose
in a simple UV box. Into the dev tank. Rinse. Into the etch tank.
I can make 8 thou tracks with 8 thou spacings in <20 minutes....

Not saying the ideas presented don't have merit, just reminding all what it
has to be better than..

PK

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Danny Miller
Sent: Sunday, 8 November 2009 12:59 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Laser "route" Printed Circuit Boards

The EDM also needs a guarantee of very good electrical contact on the
trace. I'm not sure how that'd be guaranteed as the traces are cut and
will become isolated. Even if submerged in a conductive liquid, a
short, thin trace may not have good current capacity.

I just don't see where this has any benefit that compares with milling.
The milling machine can route and drill on the same pass as it does with
a trace side.

Danny

Jon Elson wrote:

> Michael Fagan wrote:
>
>> How would you etch a board using EDM? EDM cuts all the way through from

the

>> top to bottom.
>>
>>
> Somebody, I thought it was LPKF, had a machine a decade or so ago that
> worked this
> way. it had a drum that you wrapped a substrate around. This was a
> sheet of some kind
> of plastic with the copper foil laminated to it. There must have been
> an electrical connection
> from the drum to the foil. A whisker of something like Tungsten rode a
> carriage parallel to
> the drum's axis of rotation. The drum was spun and the whisker blasted
> away bits of the
> copper foil, eventually completing the PC board pattern.
>
> The copper foil was pretty thin, I think, maybe 1/4 Oz or so. Once it
> is vaporized, the substrate
> won't be affected.
>
> And, sinker EDM cuts as deep as the electrode is brought down, so it
> doesn't cut through unless
> you drive the electrode all the way through the material. But, the PC
> board thing was definitely
> a surface process only.
>
>
> Jon
>
>
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