X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
X-Virus-Scanned: Debian amavisd-new at gag.com
From: Bdale Garbee <bdale AT gag DOT com>
To: peter DOT clifton AT clifton-electronics DOT co DOT uk
Cc: geda-user AT delorie DOT com
Subject: Re: [geda-user] pcb: Patch for arcs with different radii for x and y on screen
In-Reply-To: <1403918513.6474.37.camel@pcjc2lap>
References: <ojbt218fi23of8gryausfclb DOT 1403353431756 AT email DOT android DOT com> <53A7E8F0 DOT 8020905 AT philippklostermann DOT de> <1403800440 DOT 25929 DOT 14 DOT camel AT pcjc2lap> <20140627112707 DOT GB21723 AT visitor2 DOT iram DOT es> <1403900109 DOT 6474 DOT 8 DOT camel AT pcjc2lap> <877g422gyf DOT fsf AT rover DOT gag DOT com> <1403918513 DOT 6474 DOT 37 DOT camel AT pcjc2lap>
User-Agent: Notmuch/0.18 (http://notmuchmail.org) Emacs/23.4.1 (x86_64-pc-linux-gnu)
Date: Fri, 27 Jun 2014 21:55:48 -0600
Message-ID: <874mz53cxn.fsf@rover.gag.com>
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="=-=-=";
	micalg=pgp-sha512; protocol="application/pgp-signature"
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

--=-=-=
Content-Transfer-Encoding: quoted-printable

Peter Clifton <pcjc2 AT cam DOT ac DOT uk> writes:

> On Fri, 2014-06-27 at 15:14 -0600, Bdale Garbee wrote:
>
>> Real-world blind and buried vias always connect a range of layers from N
>> to M.  The tricky bit in my experience in large-layer-count boards was
>> always when there were multiple buried vias with the same X-Y
>> coordinate.  In other words, something like layers 2-3 and 6-7 connected
>> in an 8-layer board.
>
> Hmm, turns out there is such a thing as a layer1-3 skip via.

Interesting, but it's hard for me to see how it's practically different
From=20a layer 1-3 via with a keep-out around the via on layer 2?  The
question I guess is what info does the fab need to make such a
structure?  From a design standpoint, it seems to be mostly about
allowing different annular ring diameters per layer?

Bdale

--=-=-=
Content-Type: application/pgp-signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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=CIom
-----END PGP SIGNATURE-----
--=-=-=--