Shop Essentials (Applied Mathematics)

Geometric Dimensioning & Tolerancing (GD&T) (915103)

To better define a product, geometric dimensioning and tolerancing (GD&T) is often used as a symbolic way of showing specific tolerances on drawings. GD&T is a valuable language that communicates the design intent to manufacturing and inspection. It is governed by the technical standard ASME Y14.5-2009. This course covers all aspects of GD&T. In addition to learning the theory, participants will see numerous examples that demonstrate specific applications. Participants are welcome to bring sample prints to the class for discussion or private consultation.

  • Difficulty Advanced

  • Format Instructor-Led

  • Language English


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  • Describe the benefits of using geometric dimensioning and tolerancing.
  • Explain how Rule #1 imposes certain geometric controls automatically.
  • Identify whether a given feature is considered a surface or a feature of size.
  • Interpret feature control frames, and identify correct/incorrect syntax in a given feature control frame.
  • Calculate virtual condition and describe why it is important.
  • Define a basic dimension, and explain how it relates to GD&T.
  • Recognize the MMC modifier and calculate the appropriate bonus tolerance.
  • Describe the tolerance zone for each of the 14 GD&T symbols.
  • Correctly identify datum features and determine their order of precedence.
  • Determine proper inspection methods for a given GD&T callout.