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In-Reply-To:	<9b18f396-7143-f181-38ca-54adf82436cc@linetec.nl>
From:	"Erich Heinzle (a1039181 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Mon, 6 Mar 2023 08:37:08 +1030
Message-ID:	<CAHUm0tOXcJK-c1sO5PHcR4EuRwv0PVbk10NAJeD5akv84-x0CA@mail.gmail.com>
Subject:	Re: [geda-user] Connecting pads directly to polygons (was: Strange
	errors importing gschem into PCB)
To:	geda-user <geda-user AT delorie DOT com>
Reply-To:	geda-user AT delorie DOT com

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Content-Type: text/plain; charset="UTF-8"

You could load it and then add thermals in pcb-rnd, which supports thermals
on smd pads.

You would not be able to save it in gEDA PCB format afterwards and retain
the thermals, as the pcb-rnd padstacks will not losslessly map onto gEDA
PCB pin or pad objects. The native pcb-rnd format (.rp) also supports
polygonal pad shapes, "roundrect" pad shapes and slots.

http://repo.hu/cgi-bin/pool.cgi?project=pcb-rnd&cmd=show&node=thermals

Regards,

Erich

On Mon, 6 Mar 2023 04:14 Richard Rasker (rasker AT linetec DOT nl) [via
geda-user AT delorie DOT com], <geda-user AT delorie DOT com> wrote:

> Hi Chad,
>
> Op 05-03-2023 om 16:38 schreef Chad Parker (parker DOT charles AT gmail DOT com)
> [via geda-user AT delorie DOT com]:
> > The correct way to do it is to use thermals or traces to connect pads
> > to planes, not to set the clearance to zero.
>
> AFAICT, pcb's thermal function only works for through-hole components
> not pads. So if I want to fully embed for instance a TO252 tab in a
> polygon for maximum thermal contact, I need to lay a wide enough
> rectangular trace around the tab's pad, and then connect all four sides
> to the polygon using the 'J' (join) function? Yes, that works, but it
> seems rather clumsy. Isn't it an idea to extend the join function to
> pads as well?
>
> It's mainly a problem at this moment because I'm updating an older,
> rather elaborate board with almost a hundred such connections, created
> some 5 years ago, when pcb's DRC didn't flag these as errors. Modifying
> all those pads as described will take some time, and I was hoping that
> there was a simpler way to embed the pads in polygons or else to
> suppress those DRC errors.
>
> Anyway, thanks for the feedback,
>
> Regards,
>
> Richard
>
>

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<div dir=3D"auto">You could load it and then add thermals in pcb-rnd, which=
 supports thermals on smd pads.<div dir=3D"auto"><br></div><div dir=3D"auto=
">You would not be able to save it in gEDA PCB format afterwards and retain=
 the thermals, as the pcb-rnd padstacks will not losslessly map onto gEDA P=
CB pin or pad objects. The native pcb-rnd format (.rp) also supports polygo=
nal pad shapes, &quot;roundrect&quot; pad shapes and slots.<div dir=3D"auto=
"><br></div><div dir=3D"auto"><a href=3D"http://repo.hu/cgi-bin/pool.cgi?pr=
oject=3Dpcb-rnd&amp;cmd=3Dshow&amp;node=3Dthermals">http://repo.hu/cgi-bin/=
pool.cgi?project=3Dpcb-rnd&amp;cmd=3Dshow&amp;node=3Dthermals</a><br></div>=
<div dir=3D"auto"><br></div><div dir=3D"auto">Regards,</div><div dir=3D"aut=
o"><br></div><div dir=3D"auto">Erich</div></div></div><br><div class=3D"gma=
il_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, 6 Mar 2023 04:14 Ri=
chard Rasker (<a href=3D"mailto:rasker AT linetec DOT nl">rasker AT linetec DOT nl</a>) [=
via <a href=3D"mailto:geda-user AT delorie DOT com">geda-user AT delorie DOT com</a>], &l=
t;<a href=3D"mailto:geda-user AT delorie DOT com">geda-user AT delorie DOT com</a>&gt; wr=
ote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;=
border-left:1px #ccc solid;padding-left:1ex">Hi Chad,<br>
<br>
Op 05-03-2023 om 16:38 schreef Chad Parker (<a href=3D"mailto:parker.charle=
s AT gmail DOT com" target=3D"_blank" rel=3D"noreferrer">parker DOT charles AT gmail DOT com<=
/a>) <br>
[via <a href=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank" rel=3D"nore=
ferrer">geda-user AT delorie DOT com</a>]:<br>
&gt; The correct way to do it is to use thermals or traces to connect pads =
<br>
&gt; to planes, not to set the clearance to zero.<br>
<br>
AFAICT, pcb&#39;s thermal function only works for through-hole components <=
br>
not pads. So if I want to fully embed for instance a TO252 tab in a <br>
polygon for maximum thermal contact, I need to lay a wide enough <br>
rectangular trace around the tab&#39;s pad, and then connect all four sides=
 <br>
to the polygon using the &#39;J&#39; (join) function? Yes, that works, but =
it <br>
seems rather clumsy. Isn&#39;t it an idea to extend the join function to <b=
r>
pads as well?<br>
<br>
It&#39;s mainly a problem at this moment because I&#39;m updating an older,=
 <br>
rather elaborate board with almost a hundred such connections, created <br>
some 5 years ago, when pcb&#39;s DRC didn&#39;t flag these as errors. Modif=
ying <br>
all those pads as described will take some time, and I was hoping that <br>
there was a simpler way to embed the pads in polygons or else to <br>
suppress those DRC errors.<br>
<br>
Anyway, thanks for the feedback,<br>
<br>
Regards,<br>
<br>
Richard<br>
<br>
</blockquote></div>

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