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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 organizations which, 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.
Engineers Edge offers practical industry sensitive geometric
dimensioning and tolerancing (GD&T) training on-site
and public seminars.
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