Homebrew PCBs

--- JanRwl@... wrote:
> In a message dated 02-Apr-02 05:36:45 Central Standard Time, 
> derryck@... writes:
> 
> 
> > Print your layouts using the right transparent medium for your
> printer
> > (laser or inkjet) and use that to expose the board under UV
> 
> 
> But this assumes the PRINTER will make an exact "1:1" duplicate
> of the 
> artwork you "draw" on the screen!  Without a special plotter
> DESIGNED for 
> that, how can this really happen?  Just how accurate ARE these
> ink-jet 
> printers?

I used to use a Canon 610, it was not symmetrical and printed
slightly smaller than it was supposed to. Haven't tested my Canon
6000 to any high degree of precision, I seem to recall measuring an
8x10 print once and it was within a 1/16".

Back in the days when I used copy machines to make business cards
and photo layouts, I had to use one particular copy machine. At
102%, it would print out very close to 100%. I had it worked out to
blow up a PCB or business card pattern to a particular percentage,
then I'd clean it up, then shrink it down by a particular
percentage. By the math, it wouldn't work out, but because of the
copy machine it would work out.

Steve Greenfield

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