We do it all the time.  No major problems.  It is a little bit bothersome 
when you have to go off grid to connect to or rout around metric parts.  
Be careful if you create metric parts in a non-metric database.  
Cumulative round-off error can bite you.
   
Thanks,

==========================================================
  Chris Stack
  ext. 231                       
  [log in to unmask]                    
  CD Electronics, Inc.                   
  Printed Circuit Board Designer and Purchasing Agent 
==========================================================
To understand the things that are at our door is the best
preparation for understanding those that lie beyond.
                                              -Hypatia
==========================================================

             ********** ORIGINAL MESSAGE FOLLOWS **********

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
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