9.1. MAXIMUM GAUGE ERROR

Ideally, a gauge should not "use up" more than 10% of the allowable tolerance. 30% is generally used as a maximum gauge error. If a gauge has a 30% error, then the supplier must keep the product measurements within 70% of the tolerance to ensure that the product is within specification.

Some plants discover that as many as half of their gauges will not meet the 30% criterion. Even after extensive rework, many gauges cannot pass the simplified gauge verification because the tolerance is too tight for the gauge design.

Case Study: Gauge Error on Measuring Molds

Acomplex mold was being sourced from an outside supplier, which had been supplying them for many years. There had been ongoing complaints about the dimensions ...

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