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Subject:	Re: ASSY: Polishing Fiducials
From:	"Allen Hertz" <[log in to unmask]>
Date:	Tue, 12 Nov 96 13:32:38 EST
Content-Type:	text/plain
Parts/Attachments:	text/plain (58 lines)

     Pat,
     
     That concept works well. The term "Pink Pearl" was coined as the 
     processes since one would purchase a number of those little pink 
     erasers and go scrub fiducials. This was effective for HASL or other 
     tin-lead finished boards.Gold or OSP finsihes generally do not require 
     this operation.
     
     An alternative used was to place lighting under the board and change 
     the PCB layout by removing all metallization and resist around and 
     under the fiducial. The "backlighting" provides a silhouette, 
     eliminating any variations due to reflection. This is a major task, 
     especially for various board sizes.
     
     Regards,
     Allen Hertz
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: ASSY: Polishing Fiducials
Author:  [log in to unmask] at ftl03
Date:    11/12/96 12:48 PM


>From the What Will They Think Of Next (WWTTON) dept:
     
I have found that if we use an eraser on a pencil to "polish" the fiducials 
on the board, I get better placement accuracy.  
     
Have any of you found this to be the case?  What do you use for a tool?
     
     
-Pat-
     
-------------
Patrick McGuine
Nicolet Instrument
[log in to unmask]
(608) 276-6334
     
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