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From:	"Mitch Davis (mjd+geda-user AT hackvana DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject:	Re: [geda-user] Component Cut-outs in PCB
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On Thu, Jul 23, 2015 at 4:30 AM, Stephen Besch <sbesch AT buffalo DOT edu> wrote:

>
> First off, every board shop that I deal with want cut-outs in a separate
> gerber file.


How odd.

I ask my customers to put cut-outs either in the outline file (.gm1 or
.gko) or do it as a non-plated slot, along with non-plated holes
(-NPTH.txt).  I wrote about it here:

  http://hackvana.blogspot.com.au/2014/02/slots.html

Gerber/Excellon are formats which exist to convey info from CAD to CAM.  In
the words of Karel Tavernier (who is the boss of Ucamco, the custodian of
Gerber), "The Extended [Gerber] format enables clear, unambiguous
communication between designer and CAM engineer".

This is a really interesting article, especially the first page:


http://www.ucamco.com/files/downloads/file/22/Kick_Starting_a_Revolution_IPC-2581_Meets_Gerber.pdf

IMO it's a mistake for us to second-guess how a board shop actually makes
the boards.  It serves as a specificationm and should just describe what we
want.  I really can't understand that a company would require us to do
their CAM job work for them.  Sigh.

Mitch.

(thanks to xmd for writing the pcb patch which adds --name-style hackvana)

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<br><div class=3D"gmail_quote">On Thu, Jul 23, 2015 at 4:30 AM, Stephen Bes=
ch <span dir=3D"ltr">&lt;<a href=3D"mailto:sbesch AT buffalo DOT edu" target=3D"_b=
lank">sbesch AT buffalo DOT edu</a>&gt;</span> wrote:<br><blockquote class=3D"gmai=
l_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex"><br>First off, every board shop that I deal with want cut-outs in a s=
eparate gerber file.</blockquote><div><br>How odd.<br><br>I ask my customer=
s to put cut-outs either in the outline file (.gm1 or .gko) or do it as a n=
on-plated slot, along with non-plated holes (-NPTH.txt).=C2=A0 I wrote abou=
t it here:<br><br>=C2=A0 <a href=3D"http://hackvana.blogspot.com.au/2014/02=
/slots.html">http://hackvana.blogspot.com.au/2014/02/slots.html</a><br><br>=
Gerber/Excellon are formats which exist to convey info from CAD to CAM.=C2=
=A0 In the words of Karel Tavernier (who is the boss of Ucamco, the custodi=
an of Gerber), &quot;The Extended [Gerber] format enables clear, unambiguou=
s communication between designer and CAM engineer&quot;.<br><br>This is a r=
eally interesting article, especially the first page:<br><br>=C2=A0 <a href=
=3D"http://www.ucamco.com/files/downloads/file/22/Kick_Starting_a_Revolutio=
n_IPC-2581_Meets_Gerber.pdf">http://www.ucamco.com/files/downloads/file/22/=
Kick_Starting_a_Revolution_IPC-2581_Meets_Gerber.pdf</a><br><br>IMO it&#39;=
s a mistake for us to second-guess how a board shop actually makes the boar=
ds.=C2=A0 It serves as a specificationm and should just describe what we wa=
nt.=C2=A0 I really can&#39;t understand that a company would require us to =
do their CAM job work for them.=C2=A0 Sigh.<br><br>Mitch.<br><br>(thanks to=
 xmd for writing the pcb patch which adds --name-style hackvana)<br><br><br=
></div></div>

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