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Mail Archives: geda-user/2017/03/28/14:10:11

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From: "Britton Kerin (britton DOT kerin AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Tue, 28 Mar 2017 10:08:42 -0800
Message-ID: <CAC4O8c_c76o0A7RFvZuKOnS9JidWR5fz+CVKYFBO307AA1PF8g@mail.gmail.com>
Subject: Re: [geda-user] No support for solder paste in pcb file format ?
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On Tue, Mar 28, 2017 at 6:19 AM, John Luciani (jluciani AT gmail DOT com)
[via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> On Tue, Mar 28, 2017 at 9:24 AM, <karl AT aspodata DOT se> 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?

>> Yes, that would be a way of doing it, similar to DJ Delories method.
>>
>> Then I could have a flag in the fp generator to either make paste pads
>> 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]
> )

Then what?  Is there another script that modifies generated gerbers or
produces another layer that gets sent to the fab?

What I've always done is just not care about parts that call for a grid of
paste squares and I haven't had any failures so far, but those designs
have all seen only small production runs.

Britton

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