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| From: | "Chad Parker (parker DOT charles AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> |
| Date: | Tue, 14 Mar 2017 16:09:14 -0400 |
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| Subject: | Re: [geda-user] [pcb-rnd] tEDAx footprint load support |
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--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] <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
<div dir=3D"ltr"><div>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.<br><br=
></div>It only has to happen to you once on a really expensive project...!<=
br></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Tue, =
Mar 14, 2017 at 3:55 PM, Girvin Herr (<a href=3D"mailto:gherrl AT fastmail DOT com=
">gherrl AT fastmail DOT com</a>) [via <a href=3D"mailto:geda-user AT delorie DOT com">ge=
da-user AT delorie DOT com</a>] <span dir=3D"ltr"><<a href=3D"mailto:geda-user@=
delorie.com" target=3D"_blank">geda-user AT delorie DOT com</a>></span> wrote:<=
br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left=
:1px #ccc solid;padding-left:1ex">
=20
=20
=20
<div bgcolor=3D"#FFFFFF" text=3D"#000000"><span class=3D"">
<p><br>
</p>
<br>
<div class=3D"m_-744845904413356317moz-cite-prefix">On 03/14/2017 12:31=
PM, Chad Parker
(<a class=3D"m_-744845904413356317moz-txt-link-abbreviated" href=3D"m=
ailto:parker DOT charles AT gmail DOT com" target=3D"_blank">parker DOT charles AT gmail DOT com<=
/a>) [via <a class=3D"m_-744845904413356317moz-txt-link-abbreviated" href=
=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank">geda-user AT delorie DOT com</=
a>] wrote:<br>
</div>
</span><blockquote type=3D"cite">
<div dir=3D"ltr">
<div class=3D"gmail_extra">
<div class=3D"gmail_quote"><span class=3D"">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex"><span>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e=
x;border-left:1px #ccc solid;padding-left:1ex">=C2=A0-
Holes without plating is common.<br>
</blockquote>
<br>
</span>
Common, but not essential. The same footprint could work
fine with plated holes. <br>
</blockquote>
<div>=C2=A0<br>
</div>
<div>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.<br>
</div>
<br>
<br>
</span><div>--Chad<br>
</div>
</div>
</div>
</div>
</blockquote>
+1<br>
I was in the aerospace industry for years and I agree.=C2=A0 Mounting
holes shall not be plated.=C2=A0 I no longer remember why.=C2=A0 Probab=
ly due
to a failure or two traced to the pth mounting holes - A reliability
issue.=C2=A0 Ignoring history and thinking outside the box is not alway=
s
a good thing to do.<br>
<br>
Girvin Herr<br>
<br>
</div>
</blockquote></div><br></div>
--94eb2c0e4accfb3572054ab666c3--
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