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Date: Fri, 3 Feb 2012 10:24:37 -0800
From: Colin D Bennett <colin AT gibibit DOT com>
To: geda-help AT delorie DOT com
Subject: Re: [geda-help] PCB: How can i make pin with copper ring only on
 solder layer. (fwd)
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On Thu, 2 Feb 2012 20:28:30 -0500
DJ Delorie <dj AT delorie DOT com> wrote:

> 
> > > Also copper on component side is useless. This board is 2
> > > sided
> > 
> > Uhm. How can a board with copper on only one side be a 2-sided
> > board? 
> 
> I think his point was that it's a "traditional" 2-sided board, but
> since he's home-etching and hand-soldering it, there's no point
> having copper on the component side *of the pin* since he won't
> be soldering it, and it's not electrically connected to the
> copper on the other side anyway.
> 
> Leaving the copper annulus off the component side leaves more
> room for traces between pins on the component side.

True, but the main reason I like to have a proper footprint with
pads only on the far side (bottom side for top-mounted TH
components) is because it keeps me from accidentally routing a
trace to the top side pad of that through-hole pin in pcb.  The pcb
program will happily allow it, because it thinks you're going to be
plating through all holes for through-hole components!

I make enough mistakes as it is, so I need all the help I can get
to ensure I don't make any more.

> Besides, a board has two sides whether there's copper on them or
> not ;-) (the usual jokes about mobius flex pcbs excepted)
> http://www.evilmadscientist.com/article.php/mobiuscircuit

Why did the chicken cross the mobius flex PCB?
Wait for it--to get to the same side!

Regards,
Colin