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Geometric Dimensioning & Tolerancing

Geometric Dimensioning and Tolerancing (GD&T) is a method for precisely defining the geometry of mechanical parts. It allows mechanical engineers, fabricators and designers to communicate engineering tolerances such as a permissible limit of variation in a physical dimension or a physical property of a material or a measured value such as temperature and humidity.

Learning Objectives:
GD&T training is included in almost all courses that are offered by CADD Centre for engineers. The GD&T module will impart you a thorough understanding of the following aspects:

  • Dimensioning specifications: To define the nominal, as-modeled or as-intended geometry of parts
  • Tolerancing specifications: To define the allowable variation for the form and possibly the size of individual features and allowable variation in orientation and location between features.
  • Geometric characteristics: Designers can use symbolic language on engineering drawings and computer generated 3D solid models to explicitly describe nominal geometry and its allowable variations. The geometric symbols include straightness, flatness, circularity, cyclindricity, profile of a line, surface, perpendicularity, and angularity.

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