Hello Jerry!
               Before I attempt to answer your question, I'd like to
          clear up something.  The standard router bit is not .047"
          diameter.  It is in the neighborhood of .093" or .125"
          diameter.  Our standard is .093".  Smaller router bits tend
          to decrease stack height and impact cost.  Router bit
          diameter comes into play more with inside radii than
          outside.  Enough of that...
               More of our customers tend to deal with board corners
          by creating a "corner break", typically at 45 degrees by a
          stated length.  This length is not measured "across the
          flat", but rather how far along each edge the break occurs.

           _         ___
           _ .xxx"  /      45 degrees X .xxx" (commonly .020"-.030")
                    |
                    |
          We could put a rounded corner on the board, and I'm not sure
          if we are limited to a certain minimum here or not.  I feel
          fairly confident that an arc could be created starting and
          ending .020" along each edge that would in effect cover 90
          degrees.  Most people ask us to break the corners as a
          safety concern (Careful: you could poke somebody's eye out
          with that!).  I hope this answers your question, and I'll
          see you in Florida.
          Regards,
          Tom Coyle
          Field Services Engineer
          HADCO Corporation

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