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Straightness can be defined in two ways; a 2D tolerance zone bounded by two parallel lines, typically applied to an edge or surface, or a 3D tolerance zone bounded by a cylinder, when applied to an axis. A tolerance zone is defined by the maximum allowable deviation of a feature bound by the geometry stated…
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GD&T datums control six degrees of freedom using primary (plane), secondary (line) & tertiary (point) references. Datum targets help with complex shapes.
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GD&T ensures manufacturing accuracy by using dimensional tolerances to control variations from exact dimensions.