X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :content-type;
        bh=eXxCoVGU49QzZ3KIZZK+b96D8LpmkRrEnVtTljB0MY8=;
        b=xbuFuxLH34Z/XHOYRXpihpxuDL5h9dedkj+Y6zAx3JuqXmzy4etOsiU1CmVs0YWVWC
         jtdTpSEDFQf1wqdRAFNbSLgOusWU6gGG/fwaMSd1SYVk7Mhb6OE4PXP6ZyraWPoj0tUF
         TLez6Q9QQoXbw4pHvbNNACBJqur3TROVvQ81/05PtjST7EGgwvVr+L0cUsM+VlIZiIrn
         +yyWjRGk/mlgFfKUrAhuP3GOrGPNBNBepxiOF5XUioOoP2lN9QbFvyIbN2iLqjmSYO7H
         +kMKzGNmY0TjKjM6k7u8GHO5MX39vBgOD/kOeojh0LtOeeE+A51wkeQ9HtBvo9o29gmX
         jkwQ==
MIME-Version: 1.0
X-Received: by 10.50.1.52 with SMTP id 20mr32893206igj.34.1404135567364; Mon,
 30 Jun 2014 06:39:27 -0700 (PDT)
In-Reply-To: <877g422gyf.fsf@rover.gag.com>
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>
Date: Mon, 30 Jun 2014 09:39:27 -0400
Message-ID: <CAOuGh8_3kBAbcbK-dPHkct4V2M276x4gt=MY1ebxPQ-szgRA3g@mail.gmail.com>
Subject: Re: [geda-user] pcb: Patch for arcs with different radii for x and y
 on screen
From: Bob Paddock <graceindustries AT gmail DOT com>
To: geda-user AT delorie DOT com
Content-Type: text/plain; charset=UTF-8
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

> 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.

From a discussion I had with my board house years ago:

"Per our discussion, here are hypothetical examples of pricing:

4 layer board, no blind or buried vias, price = X.
4 layer board, single blind vias (layers 1-2 or 3-4), price = X + 1/2-2/3X.
4 layer boars, single buried vias (layers 2-3), price = X + X.
4 layer board, double blind vias (layers 1-2 and 3-4) price X + X + 1/2X

If blind vias overlap layers (say 1-3 and 3-4), we would have to no
bid at this time, as laser (controlled depth) drilling would be
required, and we do not have this process currently available."