X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com X-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=i7uA/wC+4FpEDulm0HChTo5gH0SxsbX0D+NTp0eHbqw=; b=MD0MDUlW3yeIo931kxe2EpFd1oOQtV5TWNJY+Qaho/7iZtdU0Zcnlk7JlD0ml8dgN3 IbZ8ivLD5hGL1g5QHLLUvbUXE8VDl1GXa2fYEjmEE2qqEe+/zPhlGYU3xvFQUSMhTCNq 1udGa90++lCphTd203IwvdERMC5OVrLe8/ttFuA1954Uw/gu5gqakOqWpBRgWbzY4v9w hv140rf13LlUy8OeKM8ZwcQOH/wm9cT7VNcr5PlcMKxAYE2LAE4SeoBHXz+JYO0e+54Y 8UUfB4B87QIUsg8oddgsrJPT5OSjIS0LUJejgFfwCnAWnV0yVelZIZyz+VChPhp6AJgZ JN0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=i7uA/wC+4FpEDulm0HChTo5gH0SxsbX0D+NTp0eHbqw=; b=lNpRLs4DcUB1/Zsc5s5BpMyUZ5wbiaWneYeVoNbsBsh6fBmIUJrlh/qBq/afbr5GEW DiS5NCQifQLnBZTFfr78SML7VNdLpE+RJj8JT/3x4jXP6dngFU9SlDWD1orst5MLQlh7 Xt8b4YVPhYhP+rDxVHKuCYT3BisKPWl2yyOOnc9aHQOq6bZilHfT5yIbG/53OC00OwVY Q1TN97jYTyGgBsSZUTaG6TPLVtWIW/HJJBq3YjXBE8u+2x+4vxwUv+jTJbhT5+N5GWK+ oGchIMNKVppcXQFpiK6WjRQc8KFxC3oDyW0KroW6hdzUnB1W4dfhW8dA1M5djEbajKol j8WA== X-Gm-Message-State: AMke39lBa+ECuWxix1WfuyKQ/KIfPLL2BoLsQgjHgg79WJN20Le1bwlknTgk6ol33yEmxnhrt+i41q5i6Nfu9g== X-Received: by 10.98.133.6 with SMTP id u6mr46755541pfd.48.1489522155793; Tue, 14 Mar 2017 13:09:15 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <7000e948-3f4a-5676-d1ec-6017daad0cdc@fastmail.com> References: <20170314194424 DOT a2f383cf15dcf3ae8e204261 AT gmail DOT com> <7000e948-3f4a-5676-d1ec-6017daad0cdc AT fastmail DOT com> From: "Chad Parker (parker DOT charles AT gmail DOT com) [via geda-user AT delorie DOT com]" Date: Tue, 14 Mar 2017 16:09:14 -0400 Message-ID: Subject: Re: [geda-user] [pcb-rnd] tEDAx footprint load support To: geda-user AT delorie DOT com Content-Type: multipart/alternative; boundary=94eb2c0e4accfb3572054ab666c3 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 --94eb2c0e4accfb3572054ab666c3 Content-Type: text/plain; charset=UTF-8 It's because if you accidentally put too much torque on the screw, it can crack the plating and cause failures. This could result in debris that could short something intermittently, or could potentially cause the connection to fail on one of the other copper layers. It only has to happen to you once on a really expensive project...! On Tue, Mar 14, 2017 at 3:55 PM, Girvin Herr (gherrl AT fastmail DOT com) [via geda-user AT delorie DOT com] wrote: > > > On 03/14/2017 12:31 PM, Chad Parker (parker DOT charles AT gmail DOT com) [via > geda-user AT delorie DOT com] wrote: > > - Holes without plating is common. >>> >> >> Common, but not essential. The same footprint could work fine with plated >> holes. >> > > Not always. In much of my work I'm not allowed to use pth for any kind of > mounting hole, which would include holes for screwing into things like heat > sinks and packages that might be included in a footprint. > > > --Chad > > +1 > I was in the aerospace industry for years and I agree. Mounting holes > shall not be plated. I no longer remember why. Probably due to a failure > or two traced to the pth mounting holes - A reliability issue. Ignoring > history and thinking outside the box is not always a good thing to do. > > Girvin Herr > > --94eb2c0e4accfb3572054ab666c3 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
It's because if you accidentally put too much tor= que on the screw, it can crack the plating and cause failures. This could r= esult in debris that could short something intermittently, or could potenti= ally cause the connection to fail on one of the other copper layers.
It only has to happen to you once on a really expensive project...!<= br>

On Tue, = Mar 14, 2017 at 3:55 PM, Girvin Herr (ge= da-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:<= br>
=20 =20 =20

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