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ETI Professional Development Seminars

Fundamentals of GD&T 2009 - 2-Day
(Based on ASME Y14.5-2009)

Course ID # ET1150

Not currently scheduled

Online registration redirects to the SAE International website. (Learn more.)

Providing you have a basic understanding of mechanical drawings, this course teaches the terms, rules, symbols, and concepts of GD&T as prescribed in the ASME Y14.5-2009 Standard.

Utilizing the expertise of world-renowned GD&T expert Alex Krulikowski, this course offers an in-depth explanation of geometric tolerancing symbols, their tolerance zones, applicable modifiers, common applications, and limitations.

The class includes a comparison of GD&T to coordinate tolerancing; Rules #1 and #2; form and orientation controls; tolerance of position; runout and profile controls. It is up to date with the new 2009 standard and explains all the new rules and symbols. Newly acquired learning is reinforced throughout the class with more than 150 practice problems.

  • What You Receive
  • Learning Objectives
  • Who Should Attend
  • Topical Outline

Each attendee receives a robust collection of learning resources including:

  • The Fundamentals of GD&T Using Critical Thinking Skills (ASME Y14.5-2009) textbook by Alex Krulikowski
  • A GD&T Ultimate Pocket Guide (2009)
  • Free 90-day access to the Fundamentals of GD&T 2009 web training course to practice and reinforce what was learned in the classroom

Tens of thousands of students have learned GD&T through Alex Krulikowski’s textbooks, self-study courses, computer based training, and online learning center.  Students who attend courses like this one walk away with more than knowledge. They gain on-the-job skills because the learning materials are performance-based.

By attending this class, you will be able to:

  • Explain the importance of standards on engineering drawings
  • Describe the types of dimensions, tolerances, and notes
  • Explain why geometric tolerancing is superior to coordinate tolerancing
  • Interpret the general dimensioning symbols
  • Define the key terms used in GD&T
  • Recognize the symbols and modifiers used in GD&T
  • Explain the rules used in GD&T
  • Describe the concepts of worst-case boundary, virtual condition, and bonus tolerance
  • Interpret the various types of tolerance (flatness, circularity, cylindricity, straightness, perpendicularity, parallelism, angularity, position, runout, and profile)
  • Describe the datum system
  • Interpret applications of datum targets, size datum features (RMB), and size datum features (MMB)

Who Should Attend
This course is valuable for individuals who create or interpret engineering drawings, product and gage designers; process, product, and manufacturing engineers; supplier quality engineers/professionals; CMM operators; buyers/purchasers; checkers; inspectors; technicians; and sales engineers/professionals.

Students should have completed ETI's Engineering Drawing Requirements course or equivalent.


Course Introduction

  • GD&T importance, six components
  • CARE test and Significant Seven test
  • Real-world applications

Dimensions, Tolerances, & Notes Used on Drawings

  • Metric unit conventions
  • Dimensions, tolerances, basic dimensions
  • Interprting dimensional limits

Key Terms Used in GD&T

  • Size and actual local size
  • Feature, feature of size,regular and irregular features of size
  • Least and maximum material condition
  • Related and unrelated actual mating envelope
  • Specifying a pattern on a drawing

GD&T Symbols & Modifiers

  • Geometric characteristic symbols
  • Five categories, five geometric attributes, twenty-one geometric modifying symbols
  • Feature control frame and placement
  • Continuous feature modifier effects on a feature and feature of size

GD&T Rules

  • Sixteen fundamental dimensioning rules
  • Rule #1: applied to a feature of size, exceptions, overriding, inspecting
  • Independency concept, Rule #2, GO/NOGO gage

GD&T Concepts

  • Virtual condition, calculations, and worst-case boundary
  • Bonus tolerance concept and calculations
  • Verification principles for a virtual condition boundary

Flatness Tolerance

  • Derived median plane, tolerance zones
  • Rule #1 as a flatness control
  • Applied to a planar surface and feature of size
  • Bonus tolerance (at MMC)
  • Interpreting flatness tolerances using the Significant Seven Questions
  • Real-world applications, CARE test

Straightness Tolerance

  • Derived median line, tolerance zones
  • Rule #1 effects
  • Standard-compliant specification
  • Applied to a surface and a feature of size
  • Bonus tolerance (at MMC)
  • Interpreting straightness tolerances using the Significant Seven Questions
  • Real-world applications, CARE test

Circularity Tolerance

  • Tolerance zones
  • Rule #1 effects
  • Standard-compliant specification
  • Interpreting circularity tolerances using the Significant Seven Questions
  • Real-world applications, CARE test

The Datum System

  • Implied datums, benefits, terminology
  • Datum reference frame and symbol
  • Six degrees of freedom
  • Coplanar datum features
  • Multiple datum reference frames
  • Datum-related dimensions


Datum Targets

  • The datum target symbols, usage, requirements
  • Point datum target, line datum target, datum target simulators, movable datum targets
  • Datum target applications

Size Datum Features: RMB

  • Terms, methods to specify a feature of size as a datum feature
  • Effects of a datum feature (RMB)
  • Coaxial datum features of size, datum feature simulator for coaxial datum features of size (RMB)

Size Datum Features: MMB

  • Maximum material boundary (MMB) and effects
  • Datum shift, datum sequence, datum feature simulators
  • Using a hole pattern as a datum feature

Perpendicularity Tolerance

  • Implied 90° angles
  • Perpendicularity and perpendicularity tolerance
  • Common tolerance zones
  • Iindirect perpendicularity tolerances
  • Modifiers used with perpendicularity tolerance
  • Interpreting a perpendicularity tolerance using the Significant Seven Questions
  • Real-world applications, inspection methods, CARE test

Parallelism Tolerance

  • Implied parallel relationships
  • Parallelism and common tolerance zones, indirect parallelism controls
  • Modifiers used with parallelism tolerances
  • Interpreting a parallelism tolerance using the Significant Seven Questions,
  • Real-world applications, CARE test

Position Tolerance Introduction

  • True position and common tolerance zones
  • Implied relationships and advantages
  • Surface and axis interpretations
  • Real-world applications, CARE test

Position Tolerance: RFS & MMC

  • Conditions of RFS and MMC applications
  • Interpreting a position tolerance using the Significant Seven Questions

Circular & Total & Runout Tolerances

  • Circular runout and total runout tolerance, interpretation, and comparison
  • Tolerance zone shape
  • Three ways to establish a datum axis
  • Real-world applications, CARE test

Profile Tolerances: Introduction

  • Profile and true profile
  • Part characteristics affected by profile tolerances
  • Effects of datum references
  • Advantages, tolerance zone options and extents, CARE test

Class Closing

  • Course summary, personal training guide, course evaluation, customer drawing review (optional)
  • Learning assessment

Instructor(s): This course is taught by one of ETIís approved instructors, each of whom has been vetted and mentored by Alex Krulikowski.

Fundamentals of GD&T (2009)
ID # ET1150
Duration: 2 Days

Fee: $1280; SAE Members*: $1024-$1152

* The appropriate SAE Member discount will be applied through the registration process. Discounts vary according to level of membership: Elite Member 20%; Premium Member 15%; Classic Member 10%

1.3 CEUs
You must complete all course contact hours and successfully pass the learning assessment to obtain CEUs.

Quantity discounts available. ETI offers a 10% discount on three or more registrations. Call for more information.

See our locations in Livonia and Troy, Michigan.

About ETI's Registration Process
To register for this seminar, click the Register button at the top of this page. You will be redirected to the SAE International customer portal for final payment. New SAE customer registration is required.
To register by telephone, contact SAE International Customer Service at 1.877.606.7323 (U.S. and Canada only) or 1.724.776.4970 (Outside U.S. and Canada).
Effective Training Inc. (ETI) is an SAE International company.

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This file last modified 06/20/18