Geometric Dimensioning and Tolerancing 


Geometric dimensioning and tolerancing (GD&T) is a system for defining and communicating engineering tolerances. It uses a symbolic language on engineering drawings and computer-generated three-dimensional solid models that explicitly describes nominal geometry and its allowable variation.


2 Weeks (Regular / Weekend)

Entry Qualification:

Diploma or BE/BTECH from Mechanical / Production/Automotive Engineering Branch.


Learning Objectives:

The GD&T module will impart you a thorough understanding of the following aspects:

  • Dimensioning specifications: To define the nominal, as-modelled 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 geometrical Tolerances include straightness, flatness, cyclindricity, concentricity, surface, perpendicularity and angularity.

Learning Outcome:

  • How to communicate engineering configuration to all stakeholders: from designers to manufacturers through mechanical drawings
  • Tell manufacturing team what degree of accuracy and precision is needed on each controlled feature of parts
  • How to define the allowable variation in form and possible size of individual features, and allowable variation between features
  • Provide a clear and concise technique for defining a reference coordinate system on a component or assembly to be used throughout the manufacturing and inspection processes.
  • Proper application of geometric dimensioning, accepted and logical mechanical design process and design for manufacturing considerations
  • How to describe complex geometry requirements on a component or assembly using the standard symbols of GD&T
  • How to accurately and quickly define design, manufacturing and inspection requirements.
  • How to simplify the design of cost saving functional check gages, manufacturing fixtures and jigs.