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Date: Wed, 30 May 2012 07:16:15 -0700
From: Traylor Roger  <traylor AT eecs DOT oregonstate DOT edu>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] rectangular pad with hole? howto?
Message-ID: <20120530141615.GB15146@slana.eecs.oregonstate.edu>
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Colin,
Cool examples.  Thanks again.
Roger

On Wed, May 30, 2012 at 06:32:29AM -0700, Colin D Bennett wrote:
> On Tue, 29 May 2012 17:45:36 -0700
> Traylor Roger  <traylor AT eecs DOT oregonstate DOT edu> wrote:
> 
> > Russell et all,
> >   Awesome!  I was overthinking it.  Thanks so much.  Here is my
> > work below if it is helpful to someone else.
> 
> Yep, you can do a lot of tricks with simple overlapping pads.
> Overlapping pads are a useful kludge (IMO) for many things in pcb
> that you otherwise couldn't do, such as:
> 
> - custom shapes for annulus around through-hole pins such as
>   elongated/oval pads
> 
> - creating pins with a copper annulus on one side only
>   (useful for DIY PCBs that don't have plated through holes, to
>   prevent accidentally routing tracks to a non-soldered side of a
>   pin)
> 
> - custom solder mask openings
>   (like attached Optek_OVS5MxBCR4_LED.fp; toggle on the solder mask
>   layer to see the masking of the copper)
> 
> - custom solder paste apertures
>   (like attached RESC1608Nb.fp; export and look at the "homeplate"
>   shape of the paste layer)
> 
> - non-rectangular pads, since pcb doesn't support using polygon
>   entities in footprints (like attached DFN-14_Linear_DE_4x3.fp;
>   see the chamfer on the exposed pad in the center)
> 
> Regards,
> Colin