Re: gEDA-user: Footprints over the edge

[Martin Maney <maney@xxxxxxxxx>]

On Fri, Aug 08, 2008 at 01:21:51PM -0400, phil@xxxxxxxxxxxxx wrote:
> > What if you have an outline layer that you hang the parts over the
> > outline?

From what I saw yesterday during a major "what if" revision, PCB
doesn't care a hoot if parts are inside the outline or not, as long as
they're within the configured PCB size (it was picky about drawing the
outline if the line would run over a pin, though; dunno about dropping
a pin on top of it, but they could be dragged across it just fine).  As
I also inadvertently discovered, however, pcb2panel pays no attention
whatsoever to the outline, so if you're panelizing you need to set the
"real" size anyway...

> You can make two footprints for your over-the edge parts ... say one
> without the the silk information that you're using for alignment.  After
> doing the layout, switch to the footprint without the silk (?).

That would work, but doesn't seem to me to be an improvement - at least
not given that I already have the connectors I need for now in "mark
over the edge" form.  :-)  I should give it a try next time I need to
create a horizontal PC mount connector and find out.

> As for hanging parts over the outline layer ... it'll come down to your
> board maker.  I don't think PCB will shear off the stuff over the line (I
> suppose someone could make it so(?)).  Either they won't notice because
> they automatically trim anything outside of the outline, or  they'll
> suspend your job until you tell them it's okay.
> 
> I've sent boards to advanced circuits before and they didn't even notice
> there were parts of connectors (in silk) hanging over the edge.

Which suggests a variation - just one footprint with a mounting plane
indication in silk (and perhaps indicating the required clearances for
mounting as well), the rest of the outline designed to stay within the
likely board area.  Though that still only works for the two "free"
sides if panelizing...

-- 
I'm not proud.  We really haven't done everything we could to
protect our customers ... Our products just aren't engineered
for security.  -- Brian Valentine, Microsoft Senior VP
                  in charge of the Windows development team



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