Geometric Dimensioning and Tolerancing

Overview :

Effective communication and consistent measurements across engineering disciplines and processes are essential in the design and manufacture of the highest quality products. Geometric dimensioning and tolerancing (GD&T) is key to reaching these goals.

Building Information Modeling (BIM), a recent generation of CAD software, enables architects to model an intelligent 3D model-based process that equips architecture, engineering, and construction professionals with the insight and tools to more efficiently plan, design, construct, and manage buildings and infrastructure.


Why GD&T ?

GD&T is standardized and mathematized, which means that anyone knowing the language can read a drawing and interpret it as intended.It lets engineers dramatically reduce their need for drawing notes to describe complex geometry requirements on components and assemblies.

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.

Learning Outcome:

At CADD Center, we help you ace the accompanying features of GD&T:

 You will know how to communicate engineering configuration to all stakeholders: from designers to manufacturers through mechanical drawings

 You will know to tell manufacturing team what degree of accuracy and precision is needed on each controlled feature of parts

 You will know how to define the allowable variation in form and possible size of individual features, and allowable variation between features

 You will be able to 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.

 You will know the proper application of geometric dimensioning, accepted and logical mechanical design process and design for manufacturing considerations