Interpreting GD&T

Provided by: ToolingU

This class explains important rules of GD&T and also describes how common features are specified in GD&T prints. This class references the 1994 standard. Includes an Interactive Lab.

Course Objectives:

  • Identify the most relevant GD&T documentation of the standard
  • Distinguish among key terms used to describe GD&T relationships
  • Define Rule #1
  • Describe how Rule #1 affects the tolerancing of a feature
  • Describe how Rule #1 affects the gaging of a feature
  • Define Rule #2
  • Define virtual condition
  • Define resultant condition
  • Identify the correct virtual condition formula for mating parts
  • Describe the characteristics of a projected tolerance zone
  • Explain how the 3-2-1 rule restricts the six degrees of freedom for a part
  • Define datum reference frame simulator
  • Describe how the feature control frame locates a part in the datum reference frame
  • Describe how datum targets affect the gaging of a part
  • Describe the characteristics of composite tolerancing
  • Describe how statistical tolerancing affects the gaging of a part
  • Distinguish between a radius dimension and a controlled radius
  • Distinguish between GD&T dimensioning rules for conical and for flat tapers
  • Distinguish between GD&T dimensioning rules for threads and for gears.

Recommended Background

  • Recommended for manufacturing personnel, including technicians, engineers, and managers

Course ID







Communication, Critical Thinking, Personal Effectiveness, GD&T, 1994 Standard

Method of Delivery


Estimated Effort

3 hrs



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