Fundamentals of Geometric Dimensioning & Tolerancing (GD&T) Webinar
I.D. # WB0933 Duration 16 Hours
Geometric dimensioning and tolerancing (GD&T) is used as a symbolic way of showing specific tolerances on drawings. GD&T is a valuable tool that effectively communicates the design intent to manufacturing and inspection. It is governed by the technical standard ASME Y14.5M-1994, which was updated earlier this year. This course introduces participants to the GD&T system, providing a working knowledge of the correct interpretation and application of each symbol, general rules, the datum system, and 'bonus' tolerance and highlighting some of the changes in the updated Y14.5 standard. The material is reinforced with many practice exercises.
Learning Objectives
By connecting with this webinar, you will be able to:
  • Explain the benefits of geometric tolerancing
  • Identify datum features and determine their order of precedence
  • Identify and interpret each of the characteristic symbols
  • Describe the material condition modifiers and how "bonus" tolerance occurs
  • Correctly interpret GD&T feature control frames, and explain the impact on manufacturing and inspection
Who Should Attend
This course is ideal for anyone who has a need to apply or interpret geometric tolerances on a product print. Product engineers, manufacturing engineers, CAD designers, quality inspectors, and other engineering and manufacturing personnel will all benefit from a better understanding of design requirements; improved communication with customers and suppliers; and improving designs by taking advantage of bonus tolerance and other GD&T benefits. Participants should have an understanding of basic blueprint reading.
Seminar Content
Session 1
  • Why Use GD&T?
    • Review of traditional dimensioning
    • Benefits of GD&T
    • Technical standards
    • Definitions
    • Basic dimensions
    • How to read the feature control frame

Session 2
  • Rules and the Form Symbols
    • Rule #1: Size controls form
    • Rule #2: Assume RFS
    • Flatness
    • Surface straightness
    • Circularity
    • Cylindricity

Session 3
  • Bonus Tolerance
    • GD&T applied to a feature of size
    • Bonus and the MMC modifier
    • Virtual condition
    • Gaging and inspection of GD&T

Session 4
  • Datums
    • Datum vs. datum feature
    • The datum reference frame
    • Primary, secondary, and tertiary datums

Session 5
  • Profile and Orientation
    • General definition of profile
    • Profile of a line
    • Profile of a surface
    • Use of datums with profile
    • Perpendicularity
    • Angularity
    • Parallelism

Session 6
  • Position Tolerance I
    • True position
    • Position tolerance RFS
    • Using MMC or LMC
    • The "boundary" concept
    • The pitch diameter rule

Session 7
  • Position Tolerance II
    • Projected tolerance zone
    • Inspecting parts for position
    • Calculating tolerance values
    • Composite position tolerance

Session 8
  • Symmetry and Coaxial Controls
    • Concentricity
    • Symmetry
    • Circular runout
    • Total runout
  • Wrap-up
Instructor(s): John-Paul Belanger
John Paul BelangerJohn-Paul Belanger is president of Geometric Learning Systems, a consulting firm specializing in geometric dimensioning and tolerancing (G D & T). For over ten years, he has trained people throughout North America and Europe in the proper interpretation and application of G D & T per the Y14.5 standard by using practical examples. Mr. Belanger is certified by the American Society of Mechanical Engineers as a Senior G D & T Professional, and has worked with a wide range of companies in the automotive, aerospace, electronic, and other industries to apply tolerances and perform stack calculations. He holds a B.S. in aerospace engineering from the University of Michigan specializing in aircraft design and safety.

Test your PC and connection to see if it meets the minimum system requirements for the WebEx online training center before you register. Go to http://www.webex.com/lp/jointest/ and follow the onscreen instructions for "Join Meeting Test".

NOTE: The course presentation will be recorded and made available for 30 days to those who register by the deadline.
Fees: $945 SAE Members*: $756 - $851
* 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%
CEU 1.6