Homebrew PCBs

0,00025 WOW !!!
did you get the zeros right?? that is 0.00635mm.
Even if you get down to 1/10mm repetability its far better than hand 
drilling your PCB:s and that is more realistic values! To keep 
0.00025 is a real challenge and will change as soon as you sneeze or 
touch your machine. 

If you can get Excellon files from your PCB software you can use 
SheetCam to convert to G-code and also to line up your drillfile to 
your etched PCB using 2 holes as reference on your router. Will let 
you know soon my results when I get my machine ready within 2-3 weeks.

Bengt


--- In Homebrew_PCBs@yahoogroups.com, "Ed Okerson" <ed@o...> wrote:
> >  Maybe but its a matter of pure luck that any given person comes 
across
> >  one of these small drill machines your talking about. And 
spending
> >  $1000's on a brand new drill machine is just not an option. 
Building a
> >  CNC machine from scratch is a mammoth task compared, to building 
a
> >  manual drill press.
> 
> That is simply not true.  I built a CNC mill/drill based on the 
Brute
> design at www.crankorgan.com and it only took about a week to make 
it. 
> Granted it is not a professional unit, but it is accurate down to
> 0.00025", plenty good enough for hobby PCB drilling!  It cost 
virtually
> nothing to build, mostly scrap aluminum channel and scrap plastic 
blocks.
> 
> Ed Okerson