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


Skill Focus

Smart Technology



Employee Type

New Applicants,1st level Supervisors, Operations teams, Leadership, Change leaders

Method of Delivery


Estimated Effort

3 hrs



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