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Orientation Tolerances Do Not Locate (#181)

(In accordance with Y14.5M-1994 standard)

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I keep running into people who are convinced that parallelism locates surfaces. Not True! On this drawing there is a 22 mm basic dimension that locates the considered surface relative to datum A. The parallelism tolerance has nothing to do with this dimension. All three illustrations show a parallelism tolerance zone. The zone is a pair of …

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Back to Tips Tip added Feb 2005