which precision instrument is used for comparing and determining the variation in the sizes of the component
Answers
Answer:
MEASUREMENT SYSTEMS ANALYSIS TERMINOLOGY
Let’s take a look at some measurement system terminology which would helpful in measurement system analysis.
Discrimination: Smallest detectable increment between two measured values- not the same as Accuracy or repeatability. Whenever you are using a gage then there is a least count or minimum value that you can measure with this gauge.
Accuracy: It is a difference between the true average and observed average. (True average may be obtained by using a more precise measure tool). The moment that the average value is differ from the true average, then the system is not accurate. This is an indication of inaccurate system.
Stability: The difference in the average of at least 2 set of measurements with a gage over time. Let we measured an object at Time (T1) and then after time (T2) there average value are totally different.
Also see Gage Repeatability and Reproducability
Measurement is the key and essential in six sigma. Measurement System Analysis (MSA) is an experimental and mathematical method of determining how much the variation within the measurement process contributes to overall process variability. There are five parameters to investigate in an MSA;
Bias
Linearity
Stability
Repeatability
Reproducibility