Integrating Precision Gaging into Production Gage Maintenance

Abstract

Two analysis procedures are presented for using precision gages to evaluate production gage accuracy performance. These methods will facilitate precision gage operators in conducting many Gage Management System responsibilities. The first troubleshooting application uses precision gaging in a modified Gage Repeatability and Reproducibility (R&R) study on suspect production gages. This GARR method extends the usual statistical analysis of variance model to include production gage bias as well as R&R. All statistical measures of production gage performance are obtained and tested in a new single study analysis format. The GARR analysis also assess the new concept of variable gage bias, which can arise from part datum variation. Operators of portable precision gages can use GARR to evaluate floor gaging issues with a single study. It is desirable that these key team personnel be aware of new production gage troubleshooting methods. Precision gaging operators are also involved in maintaining production gages within a facility. This activity often must address a large number of gages for calibration issues. The presented modified GARR approach provides a low resource method for combined R&R assessment, which can also include bias assessment using precision gaging results.