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R&R for Dimension Differences

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    ntmhx
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    Hello everyone,

    Is it a good practice to apply R&R processes for Delta measurements? We measure 2 (eg A1, A2) dimensions in a part for which R&R is OK (below acceptance limit) but the client wants to perform R&R on the difference of these dimensions. When we perform R&R for differences A1-A2 R&R is not OK. How can I explain to him that by taking the difference of the values I calculate twice the equipment variation. Am I wrong? Is there any documentation to justify this? Is there any other method to perform R&R for differences.

    thank you,

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