03- MSA (GR&R2-1).ppt

文档介绍：Measurement System Analysis(GR&R 2)
Learning Objectives
Key Learning Points of GR&R 1
Supplementary Notes on GR&R 1
Introduction to Nested GR&R
Crossed vs Nested GR&R
Applications of Nested GR&R
Examples of Nested GR&R
Key Learning Points of GR&R 1
Components of Variation
Measurement variation can make our processes LOOK worse than they are.
Bias or Accuracy
Master Value
(Reference Standard)
Average Value
Accuracy or Bias
Actual process
average
Measurement
bias
Observed process
average
Bias
Linearity
Linearity is an issue here
Bias
True Value
Accuracy changes over part range
True
Value1
True
Value 2
True
Value 3
True
Value 4
Stability
Long term observed
variability
Actual process
distribution
Meas. System
day 1
Meas. System
day 2
Meas. System
day 3
Time
Precision
Actual process
variability
Measurement
variability
Total observed
variability
monly used criteria:
•= = % Tolerance

•= = % Contribution
•= No. of Distinct Categories
Assessing Precision
Supplementary Notes on GR&R 1