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

----- Original Message -----
From: "Michael Fagan" <woodworker88@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, November 07, 2009 9:41 AM
Subject: Re: [CAD_CAM_EDM_DRO] Laser "route" Printed Circuit Boards


> 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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