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Subject:	Re: [geda-user] gshem 1.8.2 Bug? Slotting fails for a custom BPX85
	photo-transistor array
To:	geda-user AT delorie DOT com
References:	<7b205135-7b91-e8f0-a5d8-efc4cb0b787d AT zen DOT co DOT uk>
	<s6nk214cc70 DOT fsf AT falbala DOT ieap DOT uni-kiel DOT de>
	<01968e6b-14de-7e0e-bcbd-93b35a17a6c7 AT zen DOT co DOT uk> <59B80209 DOT 7000104 AT xs4all DOT nl>
From:	"Barry Jackson (zen25000 AT zen DOT co DOT uk) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Message-ID:	<fedc2de1-8ec8-f2fe-417c-e2c9aefa6ad2@zen.co.uk>
Date:	Wed, 13 Sep 2017 12:54:50 +0100
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On 12/09/17 16:49, Bert Timmerman (bert DOT timmerman AT xs4all DOT nl) [via 
geda-user AT delorie DOT com] wrote:

> Hi Barry,
> 
> Thanks for sharing the symbol and footprint ... much appreciated.
> 
> The second pin defined in the slot could be pinseq=2 ... pinseq --> pin 
> sequence = 2.
> 
> Have a look at the section "Symbol Requirements" at 
> http://wiki.geda-project.org/geda:gschem_symbol_creation
> 
> 
> Another thing: looking at the Osram datasheet I see pins with a 
> rectangular sectional area of 0.5 mm by 0.15 mm (least) varying to 0.7 
> mm by 0.25 mm (most), depending on the use of the under side of the 
> package as a mounting surface.
> 
> This would require a drill size of 29.26 mil ... round up at 30 mil ... 
> and add 2 mil to be on the safe side when pin pitch varies and/or pins 
> are misaligned in the package (bended pins ... YMMV) giving a drill size 
> of 32 mil.
> 
> In your footprint I see drill holes of 20 mill, either way too small.
> 
> Caveat: post drill the plated through holes into unplated through holes, 
> and solder on top layer as well ;-)
> 
> One could do a "Least" and a "Most" variant of the footprint for both 
> use cases.
> 
> Just my EUR 0.02
> 
> Kind regards,
> 
> Bert Timmerman.
> 

Hi Bill,
Thanks for your input, yes I had read that section which does indeed say 
that the pinseq should increment by one, but with all the other rather 
confusing docs I was reading at the time it somehow did not sink in.

Regarding the hole sizes, thanks for your review. I never intended this 
for public consumption, nor for use by a commercial board fabricator, so 
did not really pay attention to exact hole sizes.

In my application it will be single or maybe double sided, manually 
drilled and soldered top-side where needed.

However thanks for your lesson on tolerances and attention to detail, 
all noted ;)

Cheers,
Barry

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