Stephen Lane wrote:
As a by the by a CO2 Laser won't touch copper its not the right wavelength also copper makes such a good heatsink it sucks the heat right out of the beam (CO2 Beam is an infra red one) as to resist I have use plain black matt pressure pack spray paint to create brass stencils by this method it is a little hit and miss in that the paint sometimes does not evaporate cleanly but if you wipe it over with a paint thinner quickly you can tidy it up. Then I etch it with the acid/peroxide etchant the paint is reasonably etch resistant to this & I have also had great results with the persuphate etchant as well.
I use a 40W CO2 Laser for this
Regards
Stephen Lane
--- In Homebrew_PCBs@yahoogroups.com, Mark Lerman <mlerman@...> wrote:
>
>
> You can get a 1-3 watt laser with a fiberoptic
> output that does not need a focusing lens if the
> fiber is kept close to the pcb for not too much
> money - see ebay. Whether it will burn fast enough is another question.
>
> At 02:41 AM 7/10/2011, you wrote:
> >S, hotsnausage pie:
> > >> I can't find what a kind of laser is used for that? (paint burning)
> > > We happen to be using a 60W CO2 laser cutter,
> > but you may be able to do it very successfully with less power.
> > >
> >Ouch 60W.
> >
> >I just thinking about 1/4W (DVD or BLURAY) laser. If something can be
> >done with that. (But probably is just enought for photoresist to develop.)
> >
> >
> >------------------------------------
> >
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> >
> >
> >
>