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GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T) Purpose is to describe the engineering intent of parts and assemblies Uses symbols to specify geometric characteristics and dimensional requirements Current GD&T standard: ANSI/ASME Y14.5M-2009 Symbols for: Form and profile tolerances, orientation tolerances, location tolerances, runout tolerances
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GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
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Feature control frame
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GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
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Examples of Modifiers MMC – Maximum Material Condition LMC – Least Material Condition
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GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
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ISO standard of preferred metric limits and fits: In the dimension 16h11, the tolerance zone is specified by a letter and a number, I.e. h11. An uppercase letter indicates that the tolerance applies to the hole; a lowercase letter indicates the tolerance applies to the shaft.
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GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
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GD&T
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Basic Dimension: Theoretically exact, untoleranced dimensions that specify the perfect location, size, shape, or angle of a feature. Basic dimensions are identified by enclosing the dimension in a box. Basic dimensions specify theoretically exact value from which variations are defined through feature control frames as well as toleranced features and notes. General tolerances do not apply to basic dimensions.
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GD&T
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GD&T – Datum Surfaces and Features
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GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
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GD&T – Datum Surfaces and Features
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