Geometric Dimensioning and Tolerancing (GD&T) is a language used on mechanical engineering drawings composed of symbols that are used to efficiently and accurately communicate geometry requirements for associated features on components and assemblies. GD&T is, and has been, successfully used for many years in the automotive, aerospace, electronic and the commercial design and manufacturing industries.

In today’s modern and technically advanced design, engineering and manufacturing world, effective and accurate communication is required to ensure successful end products. Currently, ASME Y14.5M – 1994 is the accepted geometric dimensioning and Tolerancing standard superseding ANSI Y14.5M – 1982.

Success oriented industries and organisations, which require accurate and common lines of communications between engineering, design, manufacturing and quality should consider geometric dimensioning and Tolerancing as their mechanical drawing standard.

 Some advantages of GD&T are: - 

1.     Provides a clear and concise technique for defining a reference coordinate system (datum’s) on a component or assembly to be used throughout the manufacturing and inspection processes.

2.     Proper application of geometric dimensioning closely dovetails accepted and logical mechanical design process and design for manufacturing considerations.

3.    Geometric dimensioning dramatically reduces the need for drawing notes to describe complex geometry requirements on a component or assembly by the use of standard symbology that accurately and quickly defines design, manufacturing and inspection requirements.

4.  GD&T concepts such as MMC (maximum material condition) when applied properly will facilitate and simplify the design of cost saving functional check gauges, manufacturing fixtures and jigs.

Course Description

The course deals with the application of GD&T fundamentals as prescribed in ASME Y14.5M – 1994. The course is designed to impart the fundamental concepts of this drafting standard. This internationally accepted symbolic design/ engineering language will enable the various technical disciplines to correctly transmit and interpret drawing specifications. This will help save time, cut costs and improve productivity.

Emphasis is placed upon providing an understanding of GD&T from the point of view of the design, manufacturing and inspection disciplines, thus enabling the uniform interpretation of engineering intent.

Course Content

Coordinate Dimensioning

Need for Standard

Symbols/Terms

Rules

Datum System

Form Controls

Orientation Controls

Position Controls

Profile Controls

Co-axial Controls

Co-planner Controls

Pre-requisites

There are no pre-requisites for this course although a basic understanding of engineering drawings would be an advantage.