Correlation of As-Built to As-Designed

Abstract

Dimensional engineering as a closed loop: build objectives, GD&T requirements, tolerance analysis, measurement plans, dimensional data reports and root cause analysis feeding back into piece part design. Model-based tolerance analysis can simulate thousands of variations in minutes and is by now common practice; the harder half is correlating what was actually built back to what was designed, so that the analysis is corrected by reality rather than merely repeated. The talk opens on a quotation from a retired Bosch Braking Systems engineering VP about why prevention rarely catches on – no one gets rewarded for problems that never happened – and is essentially an argument against that.