Can someone give me a hint please..

Conducting a MSA, evaluating the results:

• A&R, GRR Variation related to TV (Variation)

• A&R, GRR Variation related to Tolerance

• ANOVA, GRR related to TV (Variation)

• ANOVA, GRR related to TV (Variance)

The above methods give me way different GRR values, and I do not know how to handle this!

I do understand that ANOVA is preferred above A&R

I do understand ANOVA, TV related to Variation is not additive

I do understand ANOVA, TV related to Variance is additive

I do understand a good measurement system should be GRR<10%

Example:

1000mm +/-10

TV=1,085

ANOVA, Variation related to TV: GRR=27,9%

A&R, Variation related to Tolerance: GRR=9,2%

According to ANOVA the variation is too high, but compared to A&R it is less than 10%

Why should I not use this measurement system as the Variation related to Tolerance indicates?

Conducting a MSA, evaluating the results:

• A&R, GRR Variation related to TV (Variation)

• A&R, GRR Variation related to Tolerance

• ANOVA, GRR related to TV (Variation)

• ANOVA, GRR related to TV (Variance)

The above methods give me way different GRR values, and I do not know how to handle this!

I do understand that ANOVA is preferred above A&R

I do understand ANOVA, TV related to Variation is not additive

I do understand ANOVA, TV related to Variance is additive

I do understand a good measurement system should be GRR<10%

Example:

1000mm +/-10

TV=1,085

ANOVA, Variation related to TV: GRR=27,9%

A&R, Variation related to Tolerance: GRR=9,2%

According to ANOVA the variation is too high, but compared to A&R it is less than 10%

Why should I not use this measurement system as the Variation related to Tolerance indicates?

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