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Subject:	Re: Mixed Metric and Inch Components
From:	[log in to unmask]
Date:	Wed, 7 Aug 1996 13:31:43 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (49 lines)

     I don't think I have any designs that DON'T have a combination of inch 
     and metric components!  If there are through-hole devices with 100 mil 
     pin-pitch, then I place all my components on a 100 mil (2.54mm) grid.  
     Our auto-router only routes on a mil grid, so I use the smallest 
     routing grid available (1 mil, or .0254 mm).  The only routing problem 
     I've had so far has been with an ultra-fine-pitch QFP (0.4mm 
     pin-pitch).  The pitch is so fine that the auto-router can't route to 
     the pins without causing DRC errors.  I hand-routed these pins to 
     fan-outs before I auto-routed the board.  Anyway, this has worked for 
     me.  Good Luck!
     
     M. J.


______________________________ Reply Separator _________________________________
Subject: Mixed Metric and Inch Components
Author:  [log in to unmask] at _INTERNET
Date:    8/7/96 10:54 AM


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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