Type 1 Gage study

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Csaba Fodor

The current Gage R&R functionality is excellent, but we have been looking for a simple approach to verify the gage variation before executing a full Gage R&R study with multiple units and operators. 

We would like to see something similar to Minitab´s type 1 gage study functionality, where we can measure a known good unit with a reference value, multiple times on a single station. The system would return Cg and Cgk metrics as key measurements.

A type 1 gage study assesses the capability of a measurement process - Minitab

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6 comments

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  • Bjaj

    Hi
    I would really appreciate this feature in WATS.
    We perform this test on all new test equipment we make and also when we are in doubt if the test equipment is performing ok.

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  • Bjaj

    Hi WATS
    Can you give a status on this Idea, please
    It's really a needed feature. 
    Thanks in advance

    Bjarne Jørgensen

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  • Tommy Egeberg

    Hi Bjarne.

    Will adding this functionality to the GR&R step details view be helpful?

    Are the values ​​(Cg and Cgk) sufficient or do you prefer the chart?

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  • Bjaj

    Hi Tommy
    We very seldom do the GR&R test, so I don't know how it looks in WATS?
    But what I need is that I can filter into the test of the same serial number that has been tested several times.
    Then show the result in a schema with the following columns:
    Part number, Serial Number, Operator, SW filename, Number of parts, DUT id, PC name, Fixture, Step name, Status, Low limit, Value, High limit, Mean, StDev, Cg, CgK, Bias, %Var(Repeatability), %Var(Repeatability and Bias), P value.

    It should be possible to do the Type 1 test with "No Bias test".

    About Chart: I would like that I can point at a test step and then get a chart of that Type1 test. Also have the possibility to export data to excel or Minitab (in a format that Minitab understand), by pointing at a single test step.

     

    Thanks in advance
    Bjarne

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  • Tommy Egeberg

    Thanks.

    Unfortunately, I am not familiar with minitab.

    Can you elaborate on the "No bias test"? Is this essentially the same as excluding the Cgk and %Var(Repeatability and Bias) calculations?

     

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  • Bjaj

    I think its not necessary to have the option for "No bias test".
    In Minitab they just show a graph without P and T value.

    One thing more: The reference value for the Type1 test can be the average value for the measurements of the single steps. This will show no bias.
    Then if I chose to see a graph for a step, then I would like to have the opportunity to change:

    • Reference value
    • Upper/lower specification

    and see the result with these values.

    Example Graph:
    And Table like this (sorry for the small picture):

                                     
                                       
                                       
                                     
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
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