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

What do you mean by 'top to bottom'?

Electro-Discharge Machining uses spark erosion to remove metal. So you have
the board laying flat in some EDM fluid. Then you would have a single
filament copper wire(0.2mm) just above the board, moving left to right,
then move a step and traverse again. Spark away the excess copper leaving
just the desired pattern.

Roland


2009/11/7 Michael Fagan <woodworker88@...>

> How would you etch a board using EDM? EDM cuts all the way through from
> the
> top to bottom.
>
> On Sat, Nov 7, 2009 at 02:00, Roland Jollivet <Roland.Jollivet@...
> >wrote:
>
> >
> >
> > Laser drilling of via's is not new, maybe 10 years old. And yes, pulsed
> > Yag.
> > If you look at any compact board from the east, the via's are barely
> > visible. All laser drilled, at a hellish rate.
> >
> > I still think (without trying) that good resolution PCB etching could be
> > obtained using a fine wire and EDM or ECM in a raster format.
> >
> > Roland
> >
> > 2009/11/7 Jon Elson <elson@... <elson%40pico-systems.com>>
> >
> >
> > >
> > >
> > > Roland Jollivet wrote:
> > > > Hi alan
> > > >
> > > > Knee jerk response is; If you want to use a CO2 laser, the power
> would
> > > have
> > > > to be a bit higher than if the substrate was a wafer of steel. Shiny
> > > copper
> > > > is THE best surface for reflecting CO2 laser beams and laser mirrors
> > are
> > > > made of this for that reason. But maybe that means using 50W instead
> of
> > > 20W
> > > > ??
> > > >
> > > > What would the effect be of the burn on the fibreglass substrate? A
> > thin
> > > > burnt surface between tracks is going to be conductive, maybe not at
> DC
> > > > levels, but definately at RF.
> > > >
> > > > Notwithstanding, those teeeny vias you see on PC cards are laser
> > drilled.
> > > >
> > > If they are actually laser drilled, they are drilled by a really high
> > > power pulsed laser,
> > > YAG I think. The explosive vaporization of the epoxy leaves a fairly
> > > clean hole.
> > > Burning a gap with a CW laser would not do anywhere as clean a job, I
> > > don't think.
> > > The lasers are such expensive gear, and so easily damaged, that I think
> > > a lot of
> > > really fine holes are still mechanically drilled.
> > >
> > > Jon
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
>
>
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