Re: gEDA-user: Help ordering pcb

[joeft <joeft@xxxxxxxxxxxxx>]

You probably already have them.  It used to be the case that the 
aperture list was a separate file, but PCB includes the aperture list at 
the top of each gerber file.

Look at the file, once you get past some header info, about 10 lines in 
and you should see some lines that look like this:

%ADD18C,0.0280*%
%ADD19C,0.0600*%
%ADD20R,0.0370X0.0370*%
%ADD21R,0.0170X0.0170*%

these are aperture specifications.  There could be a few or dozens, 
depending on the variety of footprints and copper geometries required.

Later you should see the actual photoplot commands which look like this.

G54D11*X37850Y16690D02*X37840D01*
X37550Y16400D02*Y16050D01*
X38050Y18090D02*Y18100D01*
X37800Y18350D01*

pretty much all the way to the bottom.

Joe T

Robert Butts wrote:
> One of the pcb websites claims one common gerber mistake is a missing 
> aperture list.  What is this and does PCB create it?
> 
> On Fri, Aug 1, 2008 at 10:36 AM, Robert Butts <r.butts2@xxxxxxxxx 
> <mailto:r.butts2@xxxxxxxxx>> wrote:
> 
>     Do I need the unplated-drill.cnc file?
> 
> 
>     On Fri, Aug 1, 2008 at 9:49 AM, DJ Delorie <dj@xxxxxxxxxxx
>     <mailto:dj@xxxxxxxxxxx>> wrote:
> 
> 
>          > What is the stencil layer?  A pcb fab company wants me to
>         identify the top
>          > stencil, bottom stencil and outline layer.  Which gerber
>         files are these?
> 
>         Stencil is probably the silkscreen layer, assuming you can
>         figure out
>         the other ones are copper and solder mask.  For outline, if you
>         don't
>         have an explicit outline layer, use the fabrication drawing.
> 
>         board.front.gbr
>                front side copper
> 
>         board.frontmask.gbr
>                front side solder (stop) mask
> 
>         board.frontpaste.gbr
>                front side paste mask
> 
>         board.frontsilk.gbr
>                front side silk (stencil or ink)
> 
>         board.back.gbr
>                solder side copper
> 
>         board.backmask.gbr
>                solder side solder (stop) mask
> 
>         board.backpaste.gbr
>                solder side paste mask
> 
>         board.backsilk.gbr
>                solder side silk (stencil or ink)
> 
>         board.fab.gbr
>                fabrication drawing (human readable, includes outline and
>         drill makers)
> 
>         board.plated-drill.cnc
>                drills for plated-through holes
> 
> 
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