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Fundamentals of Geometric Dimensioning &Tolerancing (GD&T)
Geometric dimensioning and tolerancing (GD&T) is used as a symbolic way of showing specific
tolerances on drawings. GD&T is a valuable tool that effectively communicates the design intent
to manufacturing and inspection. It is governed by the technical standard ASME Y14.5M-1994,
which was updated in 2009. This course introduces participants to the GD&T system, providing
a working knowledge of the correct interpretation and application of each symbol, general rules,
the datum system, and & ‘bonus’ tolerance and highlighting some of the changes in the updated
Y14.5 standard. The material is reinforced with many practice exercises.
Learning Objectives
By participating in this course, you will be able to:
- Explain the benefits of geometric tolerancing
- Identify datum features and determine their order of precedence
- Identify and interpret each of the characteristic symbols
- Describe the material condition modifiers and how ‘bonus’ tolerance occurs
- Correctly interpret GD&T feature control frames, and explain the impact on manufacturing and inspection