Re: gEDA-user: Schematic Capture to dxf File - using gEDA, Inkscape, and pstoedit

["Windell H. Oskay" <windell@xxxxxxxxx>]

On Jan 24, 2010, at 8:39 AM, Dave N6NZ wrote:

> > Now that will depend on your photochemistry.  CO2 laser is not in  
> > the visible spectrum. You'd have to check the sensitivity of the  
> > photo emulsion w.r.t. wavelength.  Most litho films are not  
> > sensitive even to red, but do go up into ultra-violet.  I can't  
> > remember if CO2 is longer or shorter than visible light.  In any  
> > case, you'd get by with very low power.
>
> So now for the wacky idea of the day... an interesting hack would be  
> to make a tool head for a RepRap or some other cheap X/Y bed that  
> simply holds a green laser pointer.

That's very funny-- taking it full circle back to building a homebrew  
photoplotter, just like they use at the fab. :)

There *have* actually been some DIY photoplotter projects, you just  
need to search for those separately.
Here is one:  http://blog.makezine.com/archive/2008/10/microcontroller_based_pho.html

(And yes, the only use for CO2 in PCB fab is ablating resist layers.   
Exposing it is impractical.)



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