On Fri, 7 Oct 2005 13:56:12 -0700 (PDT), "Harold Hallikainen" wrote:

>Interesting discussion! I'm still designing my circuit boards in inches
>and constantly dividing mm on datasheets by 25.4 . My board layout
>software supports dimensioning in mm. I haven't tried that, though. What
>does a metric Gerber file look like? Are the dimensions converted to
>inches, or is their a header saying the dimensions are in mm (or um?)?
>

There are two Gerber header lines:

MOIN*  (for inches)

and 

MOMM* (for millimeters)

which specify the measurement system that's applicable for that Gerber
file. 

There's another statement ('Format', the 'FS' line) that specifies
leading or trailing zero suppresion and where the decimal point is
presumed to be.


Regards, Bob

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