delorie.com/archives/browse.cgi   search  
Mail Archives: geda-user/2017/03/31/10:42:26

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=AERTqslmHjekjwO2STDl69tvNW56K+pL+5WVKR4ktXs=;
b=jt25fwEGS+iba85LyLlw0URSS/3jv+X2Shtz14hSvlZu6a++F64MnxNLZSj3yQrVlk
q2P/QETOxV2pEg6zOY7KeQ6uWY+/1sfI44MRHtJLlC7R+eUjAVUgMhTomQIkuQFqDncz
zI4bnPkAhDSNmqXuuvchDZj2FxLQ7r1bS66eldKO00qeXuPMmXgh6Qge74jxk19a+nAC
URXiJnqJyNysx6pGx0Zpcio3RK7YSVx+5WLmuUG6qbxk6DcClQW0w2QbuiJ1gYjNcbGd
zEfsfyE5SSv6bl3++cTUfwpM9S8dQif624zUM9vDp14BG4gfgsaCBb/KB9PA/6HeuSEI
45EA==
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=AERTqslmHjekjwO2STDl69tvNW56K+pL+5WVKR4ktXs=;
b=IR7nC3k6KNKSbS0heNpcn2LtOX4ZzOwYqzYQlEJ9M5sSzgKON8PPCWJ4S1kKjfQZB2
KtMPQzvJ+XLcSyeOEQFUiVlBQQeAWPZH6qujR2x7Yj0cpBO2as6KvjsVpMi1+ppy81J3
+z1d+rnsZMyPxojsKq8RcaFOW32s+zWGPPDmLDOtA3iVZrgyBHcqP85Pl50c9bug/Uz3
GrXmT0u7zyRsZVbMOvronaLQB+GrfaLc/jlN/fDrUWtrr/OhLEf7eAMY3YG2GwL8RvVJ
FOLo+GhiayGQkVnjb06hc8knacEm/OhR0Hur2sZBwFrW1vF3Y7PlqbsG2GcS6FSubuhr
A92Q==
X-Gm-Message-State: AFeK/H0PaVyANw1K47069oo2uYZgNTzkg4MEYXv9bVhFR3K/BU9oEexTaBPuulBjhUo7v76AqHlNgrhoWTjO/Q==
X-Received: by 10.31.136.136 with SMTP id k130mr1253423vkd.60.1490971235955;
Fri, 31 Mar 2017 07:40:35 -0700 (PDT)
MIME-Version: 1.0
In-Reply-To: <CA+qhd=-+AM_zsdJXCCzcH8X74LfA=tr1OsksasbTkBdc-v1Z=w@mail.gmail.com>
References: <20170327154129 DOT 68029809DB6C AT turkos DOT aspodata DOT se>
<CA+qhd=_Gi=-wrWOKJSrVq3stF5uCLpfur8KcW3FnLrn7=vF+4w AT mail DOT gmail DOT com>
<20170328132437 DOT 46A6B809DB6C AT turkos DOT aspodata DOT se> <CA+qhd=-tZ7cxoB4Db_Bkx47U15OoWUAkiHAW_Xo7aWX8GYfTRQ AT mail DOT gmail DOT com>
<CAC4O8c_c76o0A7RFvZuKOnS9JidWR5fz+CVKYFBO307AA1PF8g AT mail DOT gmail DOT com>
<CA+qhd=_5PGzXEr-KvKKCRZtgtd0oFvD-=6AjD=D=0_tf93VV+Q AT mail DOT gmail DOT com>
<20170329182946 DOT ae2033e7ec476c9f1ddd35f3 AT gmail DOT com> <CA+qhd=_y_waDfNMpmROtd7X6E1Rn-BYcYiD7SHkePNwhCKTXZg AT mail DOT gmail DOT com>
<20170330182655 DOT 91a8f3e1f328bd0becb1ca3f AT gmail DOT com> <CA+qhd=-+AM_zsdJXCCzcH8X74LfA=tr1OsksasbTkBdc-v1Z=w AT mail DOT gmail DOT com>
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Fri, 31 Mar 2017 16:40:35 +0200
Message-ID: <CADL2oCVwg7sA+LpS7oDm=6faq2QEyS6Zw5tUhn4Wa8bj8ozmhg@mail.gmail.com>
Subject: Re: [geda-user] No support for solder paste in pcb file format ?
To: geda-user AT delorie DOT com
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

--001a1145955ae3b9ec054c07ca03
Content-Type: text/plain; charset=UTF-8

I used other software before and there it was possible to draw in paste
layer but I also heard files where modified before production. It is more a
question about if paste layer is bettery generated from a template like
clearance is around objects or by manually adding objects to the layer?

2017-03-31 1:50 GMT+02:00 John Luciani (jluciani AT gmail DOT com) [via
geda-user AT delorie DOT com] <geda-user AT delorie DOT com>:

>
>
> On Thu, Mar 30, 2017 at 12:26 PM, Nicklas Karlsson (
> nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] <
> geda-user AT delorie DOT com> wrote:
>
>> > > > > >> John Luciani:
>> > > > > >> > I create stencil footprints with the same basename as
>> > > > > >> > the component footprint and a ".sfp" extension. I have
>> > > > > >> > a script that parses the pcb and identifies all components
>> > > > > >> > that have a stencil footprint.
>> > > > >
>> > > > > I couldn't find this script on your page.  Could you please post
>> or
>> > > link?
>> > > > >
>> > > >
>> > > > The script isn't quite ready for prime-time.
>> > >
>> > > But you tell why these scipts are good?
>> > >
>> > >
>> > The current script identifies the footprints that should be changed when
>> > generating gerbers for a stencil. The completed script will perform the
>> > replacement.
>>
>> To put it another way. Is it better to generate paste layer from a script
>> than manually editing each footprint?
>>
>
> I do not manually edit anything. If a part requires a stencil footprint it
> is generated with a script along with the footprint.
>
> For the other parts I do not bother. Future versions of the script will
> accommodate parts
> without sfp files by generating slightly reduced stencil openings for each
> pad.
>
>
>>
>> > > > > >> as thin line silk for checking or write the pads to the sfp
>> file.
>> > > > > >>
>> > > > > >> Do you have any specific file format for your sfp files ?
>> > > > > >>
>> > > > > >
>> > > > > > I just make them as normal footprints. For example - the stencil
>> > > > > footprint
>> > > > > > below is for a Cree XP-G LED --
>> > > > > >
>> > > > > > Element[0x0 "LED" "" "" 0 0 9996 2996 0 100 0x0]
>> > > > > > (
>> > > > > >    Pad[-5511 -5511 -5511 5511 1968 2000 2968 "" "1" 0x0100]
>> > > > > >    Pad[5511 -5511 5511 5511 1968 2000 2968 "" "2" 0x0100]
>> > > > > >    Pad[-492 -3937 492 -3937 2952 2000 3952 "" "3" 0x0100]
>> > > > > >    Pad[-492 0 492 0 2952 2000 3952 "" "3" 0x0100]
>> > > > > >    Pad[-492 3937 492 3937 2952 2000 3952 "" "3" 0x0100]
>> > > > > >    ElementLine[7996 -2484 7996 -7996 1000]
>> > > > > >    ElementLine[7996 -7996 -7996 -7996 1000]
>> > > > > >    ElementLine[-7996 -7996 -7996 -2484 1000]
>> > > > > >    ElementLine[7996 2484 7996 7996 1000]
>> > > > > >    ElementLine[7996 7996 -7996 7996 1000]
>> > > > > >    ElementLine[-7996 7996 -7996 2484 1000]
>> > > > > >    ElementArc[-7996 -10496 500 500 0 360 1000]
>> > > > > > )
>> > >
>> > > The *.sfp files are used to define shapes for solder paste?
>> > >
>> >
>> > The shapes define openings in a stencil.
>>
>> Then the shapes end up on the "stencil" layer, I think "paste" layer is a
>> common name for this layer.
>>
>>
>> > > > For thermal pads I always use the grid. I have seen a lot of
>> production
>> > > > problems. Bridging and misalignments. On these large pads I use a
>> grid
>> > > > which reduces the coverage to between 50 - 60%.
>> > >
>> > > You use a grid because there will be production problems for a solid
>> shape?
>> > >
>> >
>> > Yes. I have seen bridging and misalignments. All of the components that
>> > I have used (with thermal pads) have recommended stencil openings
>> > as well as footprints. I either follow the datasheet recommendation or
>> > the manufacturer application notes.
>>
>> I do not perfectly understand this, do you have an example for example
>> datasheet or application note?
>>
>
>
> The datasheet for the Cree XPG is at
>
> www.cree.com/led-components/media/documents/XLampXPG-15B.pdf
>
> Near the end of the file are the footprint and stencil
> recommendations.
>
>
>
>>
>>
>> Regards Nicklas Karlsson
>>
>
>
>
> --
> http://www.wiblocks.com
>

--001a1145955ae3b9ec054c07ca03
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">I used other software before and there it was possible to =
draw in paste layer but I also heard files where modified before production=
. It is more a question about if paste layer is bettery generated from a te=
mplate like clearance is around objects or by manually adding objects to th=
e layer?</div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">201=
7-03-31 1:50 GMT+02:00 John Luciani (<a href=3D"mailto:jluciani AT gmail DOT com">=
jluciani AT gmail DOT com</a>) [via <a href=3D"mailto:geda-user AT delorie DOT com">geda-=
user AT delorie DOT com</a>] <span dir=3D"ltr">&lt;<a href=3D"mailto:geda-user AT del=
orie.com" target=3D"_blank">geda-user AT delorie DOT com</a>&gt;</span>:<br><block=
quote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc=
 solid;padding-left:1ex"><div dir=3D"ltr"><br><div class=3D"gmail_extra"><b=
r><div class=3D"gmail_quote"><span class=3D"">On Thu, Mar 30, 2017 at 12:26=
 PM, Nicklas Karlsson (<a href=3D"mailto:nicklas DOT karlsson17 AT gmail DOT com" targ=
et=3D"_blank">nicklas DOT karlsson17 AT gmail DOT com</a>) [via <a href=3D"mailto:geda=
-user AT delorie DOT com" target=3D"_blank">geda-user AT delorie DOT com</a>] <span dir=
=3D"ltr">&lt;<a href=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank">ged=
a-user AT delorie DOT com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex"><span class=3D"m_-3346816896407057893gmail-">&gt; &gt; &=
gt; &gt; &gt;&gt; John Luciani:<br>
&gt; &gt; &gt; &gt; &gt;&gt; &gt; I create stencil footprints with the same=
 basename as<br>
&gt; &gt; &gt; &gt; &gt;&gt; &gt; the component footprint and a &quot;.sfp&=
quot; extension. I have<br>
&gt; &gt; &gt; &gt; &gt;&gt; &gt; a script that parses the pcb and identifi=
es all components<br>
&gt; &gt; &gt; &gt; &gt;&gt; &gt; that have a stencil footprint.<br>
&gt; &gt; &gt; &gt;<br>
&gt; &gt; &gt; &gt; I couldn&#39;t find this script on your page.=C2=A0 Cou=
ld you please post or<br>
&gt; &gt; link?<br>
&gt; &gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; The script isn&#39;t quite ready for prime-time.<br>
&gt; &gt;<br>
&gt; &gt; But you tell why these scipts are good?<br>
&gt; &gt;<br>
&gt; &gt;<br>
&gt; The current script identifies the footprints that should be changed wh=
en<br>
&gt; generating gerbers for a stencil. The completed script will perform th=
e<br>
&gt; replacement.<br>
<br>
</span>To put it another way. Is it better to generate paste layer from a s=
cript than manually editing each footprint?<br></blockquote><div><br></div>=
</span><div>I do not manually edit anything. If a part requires a stencil f=
ootprint it<br></div><div>is generated with a script along with the footpri=
nt.<br><br></div><div>For the other parts I do not bother. Future versions =
of the script will accommodate parts<br>without sfp files by generating sli=
ghtly reduced stencil openings for each pad. <br><br></div><div><div class=
=3D"h5"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<span class=3D"m_-3346816896407057893gmail-"><br>
<br>
&gt; &gt; &gt; &gt; &gt;&gt; as thin line silk for checking or write the pa=
ds to the sfp file.<br>
&gt; &gt; &gt; &gt; &gt;&gt;<br>
&gt; &gt; &gt; &gt; &gt;&gt; Do you have any specific file format for your =
sfp files ?<br>
&gt; &gt; &gt; &gt; &gt;&gt;<br>
&gt; &gt; &gt; &gt; &gt;<br>
&gt; &gt; &gt; &gt; &gt; I just make them as normal footprints. For example=
 - the stencil<br>
&gt; &gt; &gt; &gt; footprint<br>
&gt; &gt; &gt; &gt; &gt; below is for a Cree XP-G LED --<br>
&gt; &gt; &gt; &gt; &gt;<br>
&gt; &gt; &gt; &gt; &gt; Element[0x0 &quot;LED&quot; &quot;&quot; &quot;&qu=
ot; 0 0 9996 2996 0 100 0x0]<br>
&gt; &gt; &gt; &gt; &gt; (<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 Pad[-5511 -5511 -5511 5511 1968 2000 =
2968 &quot;&quot; &quot;1&quot; 0x0100]<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 Pad[5511 -5511 5511 5511 1968 2000 29=
68 &quot;&quot; &quot;2&quot; 0x0100]<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 Pad[-492 -3937 492 -3937 2952 2000 39=
52 &quot;&quot; &quot;3&quot; 0x0100]<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 Pad[-492 0 492 0 2952 2000 3952 &quot=
;&quot; &quot;3&quot; 0x0100]<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 Pad[-492 3937 492 3937 2952 2000 3952=
 &quot;&quot; &quot;3&quot; 0x0100]<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 ElementLine[7996 -2484 7996 -7996 100=
0]<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 ElementLine[7996 -7996 -7996 -7996 10=
00]<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 ElementLine[-7996 -7996 -7996 -2484 1=
000]<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 ElementLine[7996 2484 7996 7996 1000]=
<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 ElementLine[7996 7996 -7996 7996 1000=
]<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 ElementLine[-7996 7996 -7996 2484 100=
0]<br>
&gt; &gt; &gt; &gt; &gt;=C2=A0 =C2=A0 ElementArc[-7996 -10496 500 500 0 360=
 1000]<br>
&gt; &gt; &gt; &gt; &gt; )<br>
&gt; &gt;<br>
&gt; &gt; The *.sfp files are used to define shapes for solder paste?<br>
&gt; &gt;<br>
&gt;<br>
&gt; The shapes define openings in a stencil.<br>
<br>
</span>Then the shapes end up on the &quot;stencil&quot; layer, I think &qu=
ot;paste&quot; layer is a common name for this layer.<br>
<span class=3D"m_-3346816896407057893gmail-"><br>
<br>
&gt; &gt; &gt; For thermal pads I always use the grid. I have seen a lot of=
 production<br>
&gt; &gt; &gt; problems. Bridging and misalignments. On these large pads I =
use a grid<br>
&gt; &gt; &gt; which reduces the coverage to between 50 - 60%.<br>
&gt; &gt;<br>
&gt; &gt; You use a grid because there will be production problems for a so=
lid shape?<br>
&gt; &gt;<br>
&gt;<br>
&gt; Yes. I have seen bridging and misalignments. All of the components tha=
t<br>
&gt; I have used (with thermal pads) have recommended stencil openings<br>
&gt; as well as footprints. I either follow the datasheet recommendation or=
<br>
&gt; the manufacturer application notes.<br>
<br>
</span>I do not perfectly understand this, do you have an example for examp=
le datasheet or application note?<br></blockquote><div><br><br></div></div>=
</div><div>The datasheet for the Cree XPG is at <br><br><cite class=3D"m_-3=
346816896407057893gmail-_Rm"><a href=3D"http://www.cree.com/led-components/=
media/documents/XLampXPG-15B.pdf" target=3D"_blank">www.cree.com/led-compon=
ents/<wbr>media/documents/XLampXPG-15B.<wbr>pdf</a><br><br></cite></div><di=
v><cite class=3D"m_-3346816896407057893gmail-_Rm">Near the end of the file =
are the footprint and stencil </cite><br><cite class=3D"m_-3346816896407057=
893gmail-_Rm">recommendations. </cite></div><div><br>=C2=A0</div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px s=
olid rgb(204,204,204);padding-left:1ex">
<br>
<br>
Regards Nicklas Karlsson<span class=3D"HOEnZb"><font color=3D"#888888"><br>
</font></span></blockquote></div><span class=3D"HOEnZb"><font color=3D"#888=
888"><br><br clear=3D"all"><br>-- <br><div class=3D"m_-3346816896407057893g=
mail_signature"><a href=3D"http://www.wiblocks.com" target=3D"_blank">http:=
//www.wiblocks.com</a> =C2=A0</div>
</font></span></div></div>
</blockquote></div><br></div>

--001a1145955ae3b9ec054c07ca03--

- Raw text -


  webmaster     delorie software   privacy  
  Copyright © 2019   by DJ Delorie     Updated Jul 2019