Homebrew PCBs

Stefan,
        Lasers can cut, drill and engrave. I mill circuit boards. 
What saves me is the Mechanical Etching Bit has a tip that is 
triangular. Any variation of the thickness of the copper or the board 
will result in a slightly wider or narrower trace. 

                                          John 

                                                          






--- In Homebrew_PCBs@yahoogroups.com, stefan_trethan@g... wrote:
> > > Has anyone thought of a Yag laser for PCBs?
> > > I see people are actually 'milling' the unwanted copper off the 
> > > boards.
> > > 
> > > 
> > > Yags are great for copper (On CO2 lasers, copper is a BIG no-
no) 
> > and 
> > > the beam can be delivered via fiber optics with a Yag.  Plus 
you 
> > > cna 'drill' the holes without a tool change.  Get fancy and you 
can 
> > > adjust to focus for bigger/smaller kerfs (though not recomemned)
> > > 
> > > Nice chemical free way of doing it (at least chem free before 
PTHs)
> > 
> > 
> > Here is a high speed PCBoard drilling machine that uses a 
> > 
> > laser.http://www.hitachidigital.com/laser.html
> > 
> > 
> > 
> >        
> 
> really nice thing...
> 
> but seems they also don't drill the copper - they use co2 laser...
> 
> 
> i wonder how it is possible to drill the resin and the glassfibers 
in a so
> similar time that there is a smooth nice hole drilled. 
> 
> 
> (i also don't believe the yag laser milling will work, but that's 
only my
> opinion.....)
> 
> regards
> stefan
> 
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