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Re: gEDA-user: Gerber magic numbers

On Sun, 22 May 2011 15:00:35 -0700
Andrew Poelstra <asp11@xxxxxx> wrote:

> Why are the drill numbers divided by 10, and why are
> they output with leading zeroes?

For the Excellon (NC drill) format:
âMaximum m.n format supported is 2.4â [1].

That means that the units are 1/10 mil rather than the pcb-internal
1/100 mil unit.  That explains the 1/10 factor.

Regards,
Colin

[1] http://www.apcircuits.com/resources/information/nc_codes.html.


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