training material for msa.ppt

Training Material forMEASUREMENTSYSTEMANALYSIS
Contents :
INTRODUCTION FOR MEASUREMENT SYSTEM ANALYSIS
GENERAL METHODS ILLUSTRATION FOR MEASUREMENT SYSTEM ANALYSIS
VARIABLE GAGE ANALYSIS METHOD
1) THE AVERAGE-RANGE METHOD
2) THE ANOVA METHOD
ATTRIBUTE GAGE ANALYSIS METHOD
1) SHORT METHOD
2) HYPOTHESIS TEST ANALYSIS
3) SIGNAL DETECTION THEORY
4) LONG METHOD
ACCEPTABILITY CRITERIA
CONCLUSION
FOUR PARISON
Introduction: Basic requirements by QS-9000 & TS16949
Base on QS9000 & TS16949 requirements, all measurement system which were
mentioned in Quality Plan should be conducted Measurement System Analysis.
MSA
Requirement
Introduction: The category of Measurement System
Most industrial measurement system can be divided two categories, one is variable
measurement system, another is attribute measurement system. An attribute gage
cannot indicate how good or how bad a part is , but only indicates that the part is
accepted or rejected. The mon of these is a Go/No-go gage.
Variable Gage
Attribute Gage (Go/No-go Gage)
Introduction: What is a measurement process
Operation
Output
Input
General Process
Measurement
Analysis
Value
Decision
Process to
be Managed
Measurement Process
Measurement: The assignment of a numerical value to material things to represent the
relations among them with respect to a particular process.
Measurement Process: The process of assigning the numerical value to material things.
Introduction: What are the variations of measurement process
Introduction: What are the variations of measurement process
Measurement(Observed) Value = Actual Value + Variance of The Measurement System
2
σobs =
2
σ actual + σ variance of the measurement system
2
Introduction: Where does the variation of measurement e from?
The Five Characterizations of Measurement System:
1. Location Variation: Bias; Stability; Linearity
Bias is the difference between the observed average of measurements and a
reference value. Bias is often