How do I: Determine Sample size, Number of Trials and Appraisers for MSA

R

Raghav

#1
On what basis do we set
# sample size/ subgroup size for control charts (stability study)
# number of trials for bias/linearity/R&R studies
# number of appraisers for R&R
 
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A

Al Dyer

#2
Raghav:

# sample size/ subgroup size for control charts (stability study)

*5 ongoing, we chart weekly to look for trends.
---------------------------------------------
# number of trials for bias/linearity/R&R studies

*Bias = 1 part (could use an XR chart over time.

*Linearity = 1 part measuring bias over the travel range of the gage

*R&R = 3 people measuring 10 sequentially numbered parts.
--------------------------------------------
# number of appraisers for R&R

*3
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These are very basic guidelines that can be revised based on the type and application of the gage.

ASD...
 
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