The problem mixed grids causes is a transion area between the grids.
which causes funny things to happen, a rounding off problem when
the software calcuates. It's better to select one or the other
and deal with the offgrid component pins, Uses the grid thats
most common. Use an end snap to the pin for the off grid ones.
Most can vendors say they support mixed grids, or changing of
grid back and forth, I had very bad experiences with that 
approach..
Good Luck.
Lou Dallara
PCB Designer http://www.waterw.com/~ldallara/index.html
Software needs improvement in that area!!

On Wed, 7 Aug 1996, R.D. Munger wrote:

> We have a design using component footprints constructed of both inch and
> metric dimensions and would like to know what problems this could cause
> during routing.
> 
> And is this mixture a "normal" occurrence with many designs today?
> 
> Thanks.
> 
> Dan Munger
> Fermilab
> Batavia, IL USA
> [log in to unmask]
> 
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