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

I personally thought the idea of lasing off a resist was a good one.
Visions of spraying bare board with black acrylic then doing the laser
equivalent of an isolation route before etching.

PK
-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Ken , VK7KRJ
Sent: Sunday, 8 November 2009 7:13 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: RE: [CAD_CAM_EDM_DRO] Laser "route" Printed Circuit Boards

Likewise Paul- same process and timing but I have only gone down to 10thou-
but completely repeatable (and double-sided is equally easy). However, the
edm idea is very intriguing- I was in the process of modifying my pcb
drilling machine to do isolation milling, but now I am going to have a bit
of a think about the edm idea. At first glance it would seem to have the
advantage of being usable for edm machining of small parts for my model
engineering as well.


At 2009-11-08 19:18, you wrote:

>
>
>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:
><mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>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:

<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>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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Cheers, Ken
vk7krj@...
www.vk7krj.com

'It seems hard to sneak a look at God's cards. But that He plays dice and
uses
"telepathic" methods .... is something that I cannot believe for a single
moment.' (Einstein's famous quote on Quantum theory)


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