Geometric Dimensioning & Tolerancing (GD&T) overview
In order to develop a method of effective communication, standards have been put into place related to the practice of GD&T. In North America, ASME Y14.5-2009 (most updated version) is the most commonly used standard, while ISO 1101 is more prevalent in Europe. Regardless of the industry, it is common for users to outsource GD&T applications due to the ease of implementation and retrieval of accurate part data.
What is GD&T?
Geometric Dimensioning & Tolerancing (GD&T) is a language representative of engineering drawings to classify deviations and tolerance of part measurements and geometric analysis. It is an efficient way of communicating measurement conditions and specification of a part. Consisting of symbols, this language is used to define the allowable variations subject to theoretically ideal or perfect geometry.
What is the purpose of GD&T?
A language developed to assist with the understanding of dimensional requirements, GD&T can be utilized effectively in the following areas:
- Detail the engineering specifications and requirements of a part
- Assist in ensuring that the part is developed in the anticipated form
- Able to improve quality and reduce costs of produced parts