Geometric Dimensioning and Tolerancing for Mechanical Design

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Introduction to Geometric Dimensioning and Tolerancing

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1. Geometric Dimensioning and Tolerancing is a symbolic language used to specify the size , shape , form , orientation,and location of features on a part.

2. Features toleranced with GD&T reflect the actual relationship between mating parts.

3. Geometric Dimensioning and Tolerancing was designed to insure the proper assembly of mating parts , to improve quality , and reduce cost .

4. Geometric tolerancing allows the maximum available tolerance and, consequently, the most economical parts.

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5. ASME Y14.5–2009 is the current, authoritative reference document that specifies the proper application of GD&T.

6. Plus or minus tolerancing generates a rectangular -shaped tolerance zone.

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