Re: gEDA-user: SMT assembly and gerbv lilbro.mosquito.net.nz

[Dave N6NZ <n6nz@xxxxxxxx>]

John Griessen wrote:

> [jg]All I'm looking for now is a way to identify a courtyard box on the silk layer
> and relate that to pads enclosed on top soldermask layer.  Everything else would
> be too "AI" to get far enough in time.  That much might have speedup value.
> Juergen Haas's Pick and Place file GUI could be the other part that would let
> you add to a PnP (Pick and Place) file based on the above simplistic
> recognitions filed in groups that you would then check
> visually and mark off with mouse clicks, then export.

Last night it struck me that looking for identical pads arranged in a 
regular pattern might yield a lot of information.  Thinking about my 
footprints and boards, I noted that on my SO-16 footprint all pads are 
identical, and of course spaced at regular intervals in two rows.  My 
TQFP-44 had pads that are a different size from the SO-16, but all the 
pads on the TQFP are identical, and regularly spaced. So maybe simply 
looking at the gerber aperture and stroke information and grouping pads 
by identical shape and identical spacing is a good first footprint 
grouping.

Or course there are plenty of exceptions.

-dave


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