Canadian Measurement Metrology
Base Install > Training > GD&T Fundamentals

GD&T Fundamentals

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Length: 3 days
Price: $1500 CDN

Prerequisite: A working understanding of technical drawings (perspectives, sections, details, etc.). 


This is an introductory course to the ASME Y14.5 - 2009 standard.  If you lack the confidence to specify, or are having trouble interpreting the specifications, this GD&T training is for you.

Course Material Included: 

  • Fundamentals of GD&T Textbook 
  • Exercise Workbook with Tests and Quizzes 
  • Revision Reference Chart – 11” x 17” GD&T Revision Reference Chart depicting Y14.5 changes from 1982 to 1994 to 2009. 
  • Characteristics Chart – This 11” x 17” chart is a quick-reference chart that gives the main aspects and rules of all 14 geometric characteristics. 

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Course Objectives

  • Introduce the concepts and some of the language of the Y14.5 standard.
  • Enable participants to understand each of the Y14.5 standard’s symbols.
  • Bring participants to a fundamental understanding of Datum Reference Frames.
  • Understand the definitions and the effects of Material Condition Modifiers.


  • Objectives and basic overview
  • History of Geometric Dimensioning and Tolerance
  • Comparison of the “traditional” method – Coordinate Dimensioning – to the Geometric Dimensioning approac
Demonstration of GD&T’s Strengths and Advantages:
  • As a Design Tool
  • As a Manufacturing Aid
  • As an overall Communications Facilitator
General Rules of Dimensioning and Drafting per the Standard:
  • Tolerance Zones
  • Definition
  • Comparison to Existing Systems
GD&T Symbology:
  • Definitions of all 14 geometric controls
  • Modifiers and other symbols
“Bonus” Tolerances
  • Definition
  • How to take advantage of them
  • Datum shift
Datum Reference Frames:
  • Definition
  • Proper Construction and Selection

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