For HASL finish, the most common problem you see is the unevenness of the 
fiducial. The reduction in fiducial size should improve the situation. 
(0.04" Round metal Pad with 0.1" Mask free area)

 ----------
From: TechNet-request
To: TechNet
Subject: polishing fiducials
Date: Wednesday, November 13, 1996 9:05AM

Interesting discussion on using rubber erasers to "polish" fiducials.....

I presently have a customer who has to polish his fiducials in a similar
manner before his vision system  can locate our boards.  I want to try and
help this customer get out of this practice.  The board has a HASL finish.

Can anyone shed any light as to the root cause of this issue and reccomend
solutions (preferrably board related fixes - if there are any).

 I have also read in the forum that gray scale vision systems can remedy 
this.

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