On Apr 12, 2007, at 7:35 PM, PicDude 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.
>
They go in a separate drill information file.  This is apparent if you
look at one of the sites that describes their PCB process.  It goes 
like:

Drill PT holes.
Plate copper.
Drill non-PT holes.
Apply/expose/etch.
soldermask(s)
silkscreen(s)
Cut.

Since non-PT holes requires a separate drill step, many places leave it
out, and combine (or have you combine) the holes into one drill file.

BillW
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