Geometric Dimensioning and Tolerancing (GD&T) is a language used on Ai??Ai??engineering drawings composed of symbols that are used to effectively, efficiently and accurately communicate geometry requirements for associated features on components, subsystems, systems and assemblies. GD&T is successfully used Ai??Ai??in the automotive, aerospace, electronic and the commercial design and manufacturing industries. Ai??Ai??Effective and accurate communication is required to ensure products that meet customer requirements.
Currently, ASME Y14.5ai??i??2009 is the accepted geometric dimensioning and tolerancing standard. Ai??Organizations . that require accurate and common lines of communications between engineering, design, manufacturing and quality should consider geometric dimensioning and tolerancing (GD&T) as their mechanical drawing standard. Some advantages of GD&T (geometric dimensioning and tolerancing) are;
- 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.
- Proper application of geometric dimensioning closely dovetails accepted and logical mechanical design process and design for manufacturing considerations.
- 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.
- GD&T concepts such as MMC (maximum material condition) when applied properly will facilitate and simplify the design of cost saving functional check gages, manufacturing fixtures and jigs.