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 The New Elsmar Cove Forums
 Statistical Techniques and 6 Sigma
 Guardbands and Gage Studies
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| Author | Topic: Guardbands and Gage Studies |
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Raul Suarez Lurker (<10 Posts) Posts: 2 |
posted 25 August 1999 02:30 PM
  
I am familiar with the MSA method of using the average of multiple measurements to cut down the %R/R figure. But I recall, from a previous job, that the R/R number can be used to determine a GUARDBAND. Example, spec limit +/- 10 cm. R/R= 2 cm. Hence modify the limits to +/- 9 cm. Is there a statistical justification for th is? IP: Logged |
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Don Winton Forum Contributor Posts: 498 |
posted 26 August 1999 11:34 AM
quote: Guardbands are a somewhat common practice. I am not sure if this is statistical valid, but it is probably a good practice. By modifying your 'manufacturing' tolerance range versus your 'acceptable tolerance' range, you are probably assuring your customer receives a product that is suitable and acceptable. Only one word of caution. Be certain that when a process capability is performed, it is clear against which tolerance the capability is calculated against. It may cause confusion if this is not done. Regards, ------------------ Check Out dWizard's Lair: IP: Logged |
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