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Example of true position geometric control defined by basic dimensions and datum features. Geometric dimensioning and tolerancing (GD&T) is a system for defining and communicating engineering tolerances via a symbolic language on engineering drawings and computer-generated 3D models that describes a physical object's nominal geometry and the permissible variation thereof.
It was revised by MIL-STD-8A in 1953, which introduced the concept of modern GD&T "Rule 1". [5] [6] Further revisions have continued to add new concepts and address new technology like computer aided design and model-based definition. A list of revisions follows: [6] ASME Y14.5-2018, "Dimensioning and Tolerancing" Current Standard
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"Automation of Linear Tolerance Charts and Extension to Statistical Tolerance Analysis". Journal of Computing and Information Science in Engineering. 3 (1): 95– 99. March 2003. ASME publication Y14.41-2003, Digital Product Definition Data Practices; Alex Krulikowski (1994), Tolerance Stacks using GD&T, ISBN 0-924520-05-1
Date/Time Thumbnail Dimensions User Comment; current: 17:35, 6 November 2018: 64 × 64 (381 bytes): Ahecht: Horizontal lines are part of the feature control frame, not the modifier.
Position tolerance (symbol: ⌖) is a geometric dimensioning and tolerancing (GD&T) location control used on engineering drawings to specify desired location, as well as allowed deviation to the position of a feature on a part.
In a technical drawing, a basic dimension is a theoretically exact dimension, given from a datum to a feature of interest. In Geometric dimensioning and tolerancing, basic dimensions are defined as a numerical value used to describe the theoretically exact size, profile, orientation or location of a feature or datum target.
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