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Projected tolerance zone symbol (used in a feature control frame) In geometric dimensioning and tolerancing , a projected tolerance zone is defined to predict the final dimensions and locations of features on a component or assembly subject to tolerance stack-up .
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.
Coordinate dimensioning was the sole best option until the post-World War II era saw the development of geometric dimensioning and tolerancing (GD&T), which departs from the limitations of coordinate dimensioning (e.g., rectangular-only tolerance zones, tolerance stacking) to allow the most logical tolerancing of both geometry and dimensions ...
Tolerance analysis is the general term for activities related to the study of accumulated variation in mechanical parts and assemblies. Its methods may be used on other types of systems subject to accumulated variation, such as mechanical and electrical systems.
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The tolerance zone is made of twice the space between two parallel opposite planes spaced with tolerance value apart. The indication CZ implies that we shall apply location and orientation constraints between the tolerance zones. The value of the constraints are to be taken from the drawing using explicit or implicit theoretical exact dimensions.
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