Homebrew PCBs

Stefan Trethan wrote:

>If it were efficient, why isn't the industry using it?
>It takes ages compared to etching.
>
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  I think it's more usually 'gearheads' who are way more comfortable 
mechanically than in any other area, practicality doesn't enter into the 
equation..

  Note Gerhard's page, $10 for a bit that only does 1000 inches, 500 
inches of trace both sides.  That costs no more than a few printed pages 
on TT..

  They generally need to study the economics too, and switch to a proper 
floating engraving spindle.  Bottom picture in this page:

http://www.data-cut.com/page5es.html

  $150-$250 for an ok low end spindle, and the bits are only $15ish 
normally for diamond tip on the low end again.  Probably won't take too 
long to recoup the spindle price in extra life to the bits, if the 
machine is actually used much.  Plus has other good uses, like engraving 
plastic signage etc.  (That's only the spindle prices not the 
mount/motor, more for name brands too..)