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March 1999

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Subject:
Paste Height and Volume Tolerances
From:
Don E Steffen <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 22 Mar 1999 12:21:29 -0500
Content-Type:
text/plain
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text/plain (33 lines) 
     Techno's

     We have a General Scanning GC8200 3D Laser Paste Inspection System for
     our SMT lines.  We are trying to develope the methods and tolerances
     in order to establish warning and failure limits for each of our
     boards.

     I would like to know if anyone has any recommedations in percentage of
     the paste height, volume, and area for limits they set for the Warning
     and Failure limits. How were these limits derived? We started wide
     +/-30% and then started to narrow the limits!

     Has there been anyone then take the next step after establishing these
     limits and performed Vibration or Shock Test?

     Appreciate any help you can provide!

     Donn Steffen
     Quality Engineer
     VDO-CS

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