A common criterion for gauge R&R acceptance is to keep R&R under what percent of tolerance?

A common criterion for gauge R&R acceptance is to keep R&R under what percent of tolerance?

• A. Under 5% of tolerance.
• B. Under 10% of tolerance (ideally much lower).
• C. Under 20% of tolerance.
• D. Under 10% of tolerance (and some contexts allow up to 30%).

Answer: (D)

Gauge R&R shows how much measurement variation comes from the gauge itself and the way it’s used. To make sure decisions about parts are based on actual part differences and not on measurement noise, that variation should be a small portion of what’s allowed by the tolerance. A common guideline is to keep gauge R&R under 10% of the tolerance, ideally much lower, so the measurement system doesn’t mask real differences. In some contexts, especially where risk is lower or processes are very stable, teams may accept up to about 30% of tolerance, though that is less stringent. So, the described criterion—under 10% of tolerance, with possible allowances up to 30% in some contexts—best reflects typical practice.

Gauge R&R shows how much measurement variation comes from the gauge itself and the way it’s used. To make sure decisions about parts are based on actual part differences and not on measurement noise, that variation should be a small portion of what’s allowed by the tolerance. A common guideline is to keep gauge R&R under 10% of the tolerance, ideally much lower, so the measurement system doesn’t mask real differences. In some contexts, especially where risk is lower or processes are very stable, teams may accept up to about 30% of tolerance, though that is less stringent. So, the described criterion—under 10% of tolerance, with possible allowances up to 30% in some contexts—best reflects typical practice.