Tolerance analysis of fixture fabrication, from drilling holes to pointing accuracy

Probing accuracy of test fixtures implies test quality but discussions for quantitative analysis of probing accuracy is limited. Arthurs designed an automated optical inspection (AOI) for inspection of fixture probing and drilling holes and analyzed pin contact and drilling holes quality via x/y deviated positions. Reports were examined statistically and showed a significant contribution from variation of tooling holes. Scientific-based tolerances were reported for further fixture quality improvement.