MSA - what exactly mean "system" and master sample

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Peter2906

Registered
#1
#1
Dear Elsmar Forum Users,

I have a lot of questions from my collegues regarding "what do you mean by measurement system" and sometimes I have difficulty to answer.
Maybe I present an example: if we have 3 operators on one assy line and they measure 3 different diameteres (with different nominals and tolerances) using one caliper. Do you think that is one measurement system? I suppose that for such measurments performed on other assy line (different operators) another measurement system analysis should be performed. Am I right?

To conduct MSA only for gage and calculate Cgk I need to have master sample with characteristic is near nominal or in the middle of tolerance range. What to do if I have part with 30 characteristics and I have to perform MSA study. Does it mean that I need to have 30 master samples? It is very dificult to have one master sample where all characteristics are near nomial or in the middle of tolerance range.

Thanks for your your support and clarification.

Peter
 
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optomist1

optomist1

A Sea of Statistics
Super Moderator
#2
#2
What field are you in? I strongly suggest that you do some research and reading as to just what an MSA is and the many many parts, and aspects of this complex subject. Below a definition of what an MS is and a short bit as to the Analysis all from AIAG MSA Course.

"Measurement System is a collection of instruments or gages, standards, operations, methods, fixtures, software, personnel, environment and assumptions used to quantify a unit of measure or to fix assessment to the feature characteristic being measured; the complete process used to obtain measurements.

The Analysis part of the MSA...has many many contributing factors....details are extremely important in this matter...

And mea culpa; as the "Elsmar Cove is an excellent resource" in this regard...with input from a broad range of experts...across many fields of endeavor.
 
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