X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
X-TCPREMOTEIP: 63.119.35.194
X-Authenticated-UID: jpd AT noqsi DOT com
Content-Type: multipart/signed; boundary="Apple-Mail=_6C1C41AF-A16B-42CF-B72C-73253E2E7E33"; protocol="application/pgp-signature"; micalg=pgp-sha512
Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\))
Subject: Re: [geda-user] (draw on insulating layers)
X-Pgp-Agent: GPGMail 2.5.2
From: John Doty <jpd AT noqsi DOT com>
In-Reply-To: <201601091929.u09JTcKB007869@envy.delorie.com>
Date: Sat, 9 Jan 2016 14:45:24 -0500
Message-Id: <8A0C79D4-975F-4CD8-8227-2CB050304412@noqsi.com>
References: <1512221837 DOT AA25291 AT ivan DOT Harhan DOT ORG> <20160106133049 DOT 5A0E9809D79B AT turkos DOT aspodata DOT se> <CACwWb3Cyk4yLwt3=V1Mu5C4RieOQEjYH3ej5MXZSNnLPbshqDg AT mail DOT gmail DOT com> <20160106143629 DOT 4D39D809D79B AT turkos DOT aspodata DOT se> <CACwWb3BXbnQXs+DwVVzmC8DrhwOYxPgVyUhZTPL9bM9cJbHimw AT mail DOT gmail DOT com> <20160106164022 DOT D0D4E809D79B AT turkos DOT aspodata DOT se> <20160106180912 DOT 42ddf4079d91384f206b7c35 AT gmail DOT com> <20160106191433 DOT 5dc5cb59 AT jive DOT levalinux DOT org> <20160106202817 DOT 56197b2c539d426a1b724c9e AT gmail DOT com> <568E09ED DOT 1080508 AT m0n5t3r DOT info> <CACwWb3AhSh-+NNu--bVMGZBfjaoA+hHg7gbXnoyNv3oMq=e17g AT mail DOT gmail DOT com> <568E6354 DOT 80302 AT m0n5t3r DOT info> <20160108002640 DOT 03233b24 AT jive DOT levalinux DOT org> <20160108175259 DOT 127a3f073616758434f7edff AT gmail DOT com> <20160109020345 DOT 1e07cb84 AT jive> <s6n60z36ro! h DOT fsf AT blaulicht DOT dmz DOT brux> <BD84C322-333F-4A59-8CBC-54927A6B2855 AT noqsi DOT com> <20160109182213.a55836cd56a507d0833b48d6@! gmail.com> <882E12BE-93AD-4A43-B87A-65F05269D6B4 AT noqsi DOT com> <20160109193526 DOT 9f998ebeec0141b637ff5751 AT gmail DOT com> <201!
 601091929 DOT u09JTcKB007869 AT envy DOT delorie DOT com>
To: geda-user AT delorie DOT com
X-Mailer: Apple Mail (2.1878.6)
Reply-To: geda-user AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: geda-user AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com
Precedence: bulk


--Apple-Mail=_6C1C41AF-A16B-42CF-B72C-73253E2E7E33
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
	charset=utf-8


On Jan 9, 2016, at 2:29 PM, DJ Delorie <dj AT delorie DOT com> wrote:

>=20
>>> I cannot make sense of a board cutout as a layer. It=E2=80=99s an
>>> operation that applies to a set of layers.
>=20
> You're confusing drawing layers with physical layers.  PCB's drawing
> layers are just collections of shapes, much like gschem's "schematics"
> are just pages of lines.  How each layer is interpreted depends on
> what the people at the fab house are expecting.  If you tell them "the
> shape in this gerber is for internal cutouts", that drawing layer then
> means "shapes for internal cutouts=E2=80=9D.

That seems to me to be a misuse of the word =E2=80=9Clayer=E2=80=9D.

layer |=CB=88l=C4=81=C9=99r|
noun
1 a sheet, quantity, or thickness of material, typically one of several, =
covering a surface or body.

You=E2=80=99re talking about operations applied to one or more layers.

>=20
>> Neither do I. The drawn shape is either a positive image or a cutout.
>=20
> It's just a shape.  Interpreting it is up to the humans who talk to
> each other about what the shapes mean.  It would be nice if there were
> automatic ways of conveying this information (perhaps STEP) but at the
> moment we're relying on good old "talking" to solve that problem.
>=20
>> Gerber file format have the concept of dark and clear polarity.
>=20
> Irrelevent here, though.  And I've seen way too many fabs get this
> wrong; pcb never takes advantage of this.
>=20

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



--Apple-Mail=_6C1C41AF-A16B-42CF-B72C-73253E2E7E33
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
	filename=signature.asc
Content-Type: application/pgp-signature;
	name=signature.asc
Content-Description: Message signed with OpenPGP using GPGMail

-----BEGIN PGP SIGNATURE-----
Comment: GPGTools - https://gpgtools.org
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=AuP2
-----END PGP SIGNATURE-----

--Apple-Mail=_6C1C41AF-A16B-42CF-B72C-73253E2E7E33--