GD&T Dimensional Inspection Certification Test Article

Publication Details

Abstract

Geometric Dimensioning and Tolerancing (GD&T) based on ASME Y14.5 is the standard method for communicating tolerancing on mechanical parts. Engineering prepared per the requirements of ASME Y14.5 is assessed and a conformance report is produced. This becomes part of the quality record for the part and a successful report establishes First Time Quality by ensuring part performance at assembly. It has been noticed that some of the reports do not reflect an accurate assessment of the GD&T requirement.

In reviewing inspection reports on production programs we have found that the accuracy and readability of inspection reports, in some cases, are inadequate. To improve accuracy of reporting, a team has been working on developing a GD&T Dimensional Inspection Certification Test Article that we affectionately call the "Dice Block". The Dice Block incorporates common GD&T controls typically applied on Boeing’s detail parts. The design incorporates intentional deviation which allows Boeing to pinpoint failures and assess software capability and inspector competency.

Inspection of the physical Dice Block will test all aspects of measurement, data collection method, inspection equipment use, software capability, and reporting. The end goal is to provide a physical Dice Block to internal and external part suppliers to certify them to inspect mechanical parts.

To date, we have focused on software capability by virtual inspection of a deviated CAD model. Thus far, 10 different Coordinate Measurement System (CMS) software applications have been tested with more in work.

This presentation will outline our approach and provide results to date and the challenges we have faced on transitioning to a physical test article.