A method exists to precisely define the allowable deviation of a feature’s location on a manufactured part. This method establishes a tolerance zone within which the feature’s actual location must lie to be considered acceptable. The determination of this zone and verification of feature compliance involves specific calculations based on measured data relative to established datums.
Employing this positional tolerancing method ensures interchangeability of parts, reduces assembly issues, and improves overall product quality. Historically, it evolved from simpler, less precise tolerancing methods to address the complexities of modern manufacturing and the need for tighter control over feature placement. The results are fewer manufacturing errors and improved final products.
