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Date: Sun, 30 Aug 2015 20:21:20 +0000
Message-ID: <CAM2RGhS6xUJTY=GB_91nqj00Oj3Bwi9snMMHxoeRU-Z0xFXtZQ@mail.gmail.com>
Subject: Re: [geda-user] [pcb-rnd] parametric footprint: screws
From: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Sun, Aug 30, 2015 at 5:34 AM,  <gedau AT igor2 DOT repo DOT hu> wrote:
>
>
> On Sun, 30 Aug 2015, Evan Foss (evanfoss AT gmail DOT com) [via
> geda-user AT delorie DOT com] wrote:
>
>> Attached is a libreoffice/openoffice file with the screw, washer and
>> hole sizes. It took a while because I never had a complete set made
>> for all of them. Some sizes are not available I think because they are
>> imperial specific. In the process of building the list I found some
>> errors in the stuff I had already made. Apparently they were good
>> enough to fit most stuff but I like having things perfect if I am
>> going to distribute them.
>>
>> I will provide example footprints in the morning.
>>
>
> Great, thanks!
>
> I'll write a generic screw() generator, that takes numeric arguments, once I
> see how you did it with static footprints.

For metric it is a 0.30mm wide silk screen ring around the copper outline.
For imperial it is 10mil wide silk screen ring around the copper outline.

The space from the copper is just some approximation of slightly over
10mils because that seems to fit what most vendors like.

> We could have metric/imperial specialized wrappers around that. Best would
> be to set up formulas: I'm still not sure storing big tables in footprint
> generators is better than having a table of static footprints. I think we
> have a chance to be able to fit formulas with some rounding.

The hole diameters are based more on the historical data than actual
rules. I have become kind of obsessed with screw sizes ever since I
found a device at work (still manufactured) that uses a pre WWII
Japanese screw thread. All of which means that you are probably going
to have a hard time finding patterns.

Metric screws were fast to standardize head diameters but imperial
stuff still has not fully. (Yet another way Jimmy Carter was right, we
should have gone metric in the USA)

> Could you please link a html or plain text export next time?

Sure.

> Regards,
>
> Igor2

Thanks,
Evan

-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

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