John, In reply to your message attached:

	Every one of our pwa's are required to have a minimum of 2 
fiducials. In addition to those we have 1 fiducial in the center of each 
fine pitch device. We have had no problem using the fiducial in the center 
of the fine pitch device as the main mark and the next closest fiducial on 
the pwa as the sub mark. ( Fuji placement equipment terminology )

Good Luck

Dan Shea
Sr. Mfg. Eng.
Foxboro Co.


--- Begin Included Message ---

From: [log in to unmask]
Date: Mon, 14 Oct 1996 09:11:33 -0500
Subject: ASSY:  Fiducials
To: [log in to unmask]



     Address,
     
     From past design reviews we have always used 2 fiducials per 15mil and 
     20mil SMT devices (my opinion, standard). Recently our designers are 
     placing 1 fiducial in the center of the device location.  I'm not an 
     agreement with this change due to possible lead skew on pads and 
     similar problems.  Has visual P&P equipment changed such, that 2 
     fiducials are no longer required or none at all.  Please advise.  
     
     John Gulley  

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