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March 2012

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Subject:
From:
"Amol Kane (Asteelflash,US)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Amol Kane (Asteelflash,US)
Date:
Wed, 21 Mar 2012 05:07:47 -0700
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Dear All,

I am in the process of coming up with a testing plan for evaluating
solderpaste inspection (SPI) equipment and have some questions. One of
the first things I want to perform is a GR&R study on a NIST certified
target of the smallest possible size. I can understand the repeatability
part, but is reproducibility a valid measurement criterion as the only
operator involvement in this case will be assembly loading/unloading and
all other external conditions will remain the same?

 

I also plan to evaluate the effect of board rotation (0 vs 90 degrees)
on volume measurements by a simple DOE using ANOVA, investigate process
control using control charts and calculate Cpk for the calibration
target and actual volume measurements on the most technologically
complex assembly we build (0201s, QFNs, fine pitch BGAs etc.,). Don't
have anything with a 01005 as of yet.  Is there anything else that I
have not included (but is a critical data driven factor for evaluation)?
Also, If anybody else has performed SPI evaluation in the past and is
willing to share their evaluation plan, I can combine it what I have and
publish it on technet for future use with due credits.

 

Thanks,

Amol

 


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