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  Statistical Techniques and 6 Sigma
  Gage R&R with ATE

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Author Topic:   Gage R&R with ATE
Alys Madge
posted 15 August 2001 11:42 AM           Edit/Delete Message   Reply w/Quote
Can Gage R&R be useful when you are using Automatic Test Equipment to measure parts as there will be no operator to operator variation? Would you still get several operators to produce the data so that it fits into the normal analysis systems?

I am quite new to this so forgive me if my question appears strange!

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posted 15 August 2001 12:47 PM     Click Here to See the Profile for KenK     Edit/Delete Message   Reply w/Quote
Yes, you can most certainly do a measurement system analysis. In automated test equipment you would not necessarily assess operator varation.

The first thing you need to do is sit down and consider ALL the possible sources of measurement variation. If you have multiple test bays, you might want to know the variation between test bays.

The only trick is that you may have to analyze your data using a General Linear Model tool that will let you identify random effects (as opposed to fixed effects).

MINITAB, for example, will not accept NO operators, so you need to use their GLM tool and do the simple tabular math yourself.

Any good GLM tool should output the variance components for each source of variation. In MINITAB you need to click on the Results button and check the box. These components are simply the variance estimate for each source of variation. The error term will be your Repeatability.

Since the components are variances, you can sum them up as needed. Total variation equals the sum of all of them. Measurement variation equals the sum of all sources related to measurement variation (including any interactions related to measurement).

You can then take the square root of the variances to get the respective standard deviations, divide them by the total to get percentages, and multiply them by 5.15 to get the usual metrics.

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