Abd ul-Rahman Lomax wrote:

> At 10:46 AM 2/13/01 -0800, Dennis Saputelli wrote:
>
> >on the other side I once had a shop put a board on hold for a week
> >because the fab print said 8.000" but they said the board Gerbers
> >measured 7.999"
> >I pointed out that they have a 5 mil outside routing tolerance, but they
> >responded that they were ISO-9000 and needed a written sign-off for the
> >'deviation'
>
> Especially since it is reasonably unlikely that they could measure the
> Gerbers with that accuracy. In any case, that was just "dumb," since no
> deviation was required from either the Gerbers or the drawing and the
> difference might have only been round-off error. Sheesh....

No, they can measure the RS-274 data that CREATES the gerber
photoplots to rediculous accuracy, .00001" at least.  Depending on
the photoplotter actually used, they might get pretty close to that level,
too!

Jon



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