re virtual short 'cracks'

the final resolution (after several 'final' resolutions) was
do not use centroid origin, use pin 1 origin
** most important ** 
design the part so that the pad centers fall on an integer 1 mil grid
then gerber 2.3-2.5 works great, no cracks

(i had pushed the pads centers off by .005 mil and that caused the
roundoff error, *sometimes*)

Dennis Saputelli

Abd ulRahman Lomax wrote:
> 
> At 01:00 PM 6/14/2002 -0700, Dennis Saputelli wrote:
> >i can see the submil cracks in my defective virtual shorts quite easily
> >in CAMtastic
> >
> >i would agree that it is a better tool for looking at gerbers than
> >protel
> 
> Just to note, Mr. Saputelli's problem with virtual shorts was due, as I
> recall, to roundoff error in the gerber generation. The cracks would *also*
> have been visible, I expect, in gerber reimported to Protel. My point about
> Protel being better in the submil region is that the display routines are
> more accurate, even if the gerber generation is a tad shaky at times.
> 
> The Protel *database* has a substantially finer resolution than what
> CAMtastic stores, I think, and the display routines are pretty good (though
> they will sometimes show pixel cracks where none exist, but those cracks do
> not widen upon zooming in, and sometimes they even disappear at some zoom
> levels.


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