There is a file called drill drawing. It must be generated for every
layer (talking about multilayer board). This file is producing some
symbols for every drill and has a legend : SIZE, QTY, SYMbol, PLATED,
TOLerance.
On PLATED column you have a YES or NO for every drill clases.

All informations for the PCB house must be on the gerber files.

On 4/12/07, PicDude <picdude2@avn-tech.com> wrote:
> How are non-plated though holes specified in gerber files?  I'm using Eagle,
> btw, and I notice that on locations with a hole (rather than a pad) some
> board houses thru-plate them and others don't.
>
> Is there a formal spec/definition for this in the gerber file?  (This would be
> preferred over putting notes in the readme, as I've been noticing that most
> board-houses don't pay attention to the readme files.)
>
> -Neil.
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