Application of Gage R Study:
Offers a preliminary determination of short-term gage repeatability only.
May be used for screening before shipment from gage supplier.
May be used in pre-production when part availability is minimal.
May be used during gage development – e.g., for quickly comparing different clamping locations; comparing different methodologies.
This method CANNOT be used for final gage acceptance without other more complete and detailed MSA methods.
Assumptions:
Process stability and variation cannot be known at this point in time.
Linearity and bias are not issues.
Reproducibility is not considered here. The purpose is to focus on gage repeatability alone.
I/MR (Individual/Moving Range) chart will provide minimal assessment of stability.
Analyze by:
Take one part, one operator; place part in fixture, measure; take part out of fixture; repeat this 9 more times with the same part and same operator.
Plot data on I/MR chart; assess stability. If data appears unstable, perform corrective action.
If stable, calculate sigma of individuals by using either s for all readings or *2 MR d/ ; multiply by 6; divide this value by the characteristic tolerance;
multiply by 100%. Review %Repeatability against previously established gage acceptability standards, or use for comparative purposes during gage development.
source of Gage R Study: Analysis of measurement systems
