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Alex Krulikowski (1994), Tolerance Stacks using GD&T, ISBN 0-924520-05-1 Bryan R. Fischer (2011), Mechanical Tolerance Stackup and Analysis , ISBN 1439815720 Jason Tynes (2012), Make It Fit: Introduction to Tolerance Analysis for Mechanical Engineers , ISBN 1482350254
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. GD&T is used to define the nominal (theoretically perfect ...
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
Geometrical Product Specification and Verification (GPS&V) [1] is a set of ISO standards developed by ISO Technical Committee 213. [2] The aim of those standards is to develop a common language to specify macro geometry (size, form, orientation, location) and micro-geometry (surface texture) of products or parts of products so that the language can be used consistently worldwide.
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.
The Y14.5M standard establishes uniform practices for stating and interpreting dimensioning, tolerancing, and related requirements for use on engineering drawings and in related documents. [Geometric Dimensioning and Tolerancing (GD&T)] For a mathematical explanation of many of the principles in this standard, see ASME Y14.5.1M.
Technical drawing with references and geometric specifications. A datum reference or just datum (plural: datums [Note 1]) is some geometrically important part of an object—such as a point, line, plane, hole, set of holes, or pair of surfaces—that serves as a reference in defining the geometry of the object and (often) in measuring aspects of the actual geometry to assess how closely they ...
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