Organized by:
Smart Manufacturing and Lean Systems Research Group

John-Paul Belanger
John-Paul Belanger

President of Geometric Learning Systems
Rochester Hills, Michigan

Thursday, December 3, 2018
7:30 a.m. - 4:30 p.m.
S100 (Marburger Science and Engineering Auditorium)

Complimentary breakfast and lunch provided

Registration Fee: $75

Continue Education Unit (CEU) / Professional Development Unit (PDU) Credits will be available and a Certificate of Accomplishment will be provided.

To better define a product, geometric dimensioning and tolerancing (GD&T) is often used as a symbolic way to show tolerances on mechanical drawings. This one-day course covers the GD&T system per ASME Y14.5-2009, including why it reduces costs, how to interpret the symbols, and how to apply these tolerances correctly. Participants will learn the basic definitions and rules, the importance of datums, the meaning of each tolerance, and the impact on manufacturing and gaging. The class is a lecture format, with ample opportunity for questions, and participants are welcome to bring sample prints (with or without GD&T already applied) to discuss with the instructor during breaks or after the class.            


A spiral binding book for GD&T will be provided.


Marburger Science and Engineering Auditorium (Room S100)
Lawrence Technological University
21000 West Ten Mile Road, Southfield, MI 48075 
View Map:
Parking is free. You can park in parking lot D or E.


John-Paul Belanger is president of Geometric Learning Systems, based in Rochester Hills, Michigan. He is certified as a Senior-Level GD&T Professional by the American Society of Mechanical Engineers. Mr. Belanger has been a full-time GD&T instructor and consultant for 20 years, traveling throughout North America and Europe helping corporate groups implement GD&T properly in design, manufacturing, and inspection activities.  He holds a degree in aerospace engineering from the University of Michigan, specializing in aircraft design and safety.


Learning Objectives

By attending this seminar, 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 modifers 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 becoming fluent in GD&T.



Participants should have knowledge of basic blueprint reading.                                                                                                                                                                            



  • Drawings and Dimensioning
    • Importance of engineering drawings
    • The need for geometric dimensioning and tolerancing
    • Quality issues – how GD&T fits into other standards
    • GD&T standard: ASME Y14.5-2009

  • Introduction to GD&T Symbols and Terms
    • Definitions – feature, feature of size, actual mating envelope
    • Material conditions – MMC, LMC, RFS
    • Reading a feature control frame

  • Rules and Concepts of GD&T
    • Rule #1 – Size controls form
    • Rule #2 – Implied RFS
    • Basic dimensions
    • Virtual condition
    • Bonus tolerance

  • Form Tolerances
    • Flatness
    • Straightness
    • Circularity
    • Cylindricity
    • Straightness and flatness applied to a feature of size

  • Datums
    • Purpose of datums in GD&T
    • The datum reference frame – primary, secondary, tertiary
    • Feature-of-size datums
    • Datums with the “M” modifier
    • Compound datum features
    • Datum targets
    • How to select datums for a part

  • Profile Tolerances
    • General definition of profile
    • Profile of a line
    • Profile of a surface
    • Profile with datum references
    • Composite profile control

  • Orientation Tolerances
    • Perpendicularity
    • Angularity
    • Parallelism

  • Location Tolerances
    • Definition of “true position”
    • Application of position at RFS
    • Using position with MMC or LMC
    • Composite position control
    • Projected tolerance zone
    • Concentricity – why it is not recommended
    • Symmetry

  • Runout Tolerances
    • Difference between runout and other circular controls
    • Circular runout
    • Total runout

  • Wrap-up and Course Evaluation



Ahad Ali, Ph.D.
Associate Professor
Director, Bachelor of Science in Industrial Engineering (BSIE)
Director, Master of Science in Industrial Engineering (MSIE)
Director, Smart Manufacturing and Lean Systems Research Group
Faculty Advisor – IISE Student Chapter and SME Student Chapter

Email:, Phone: 248-204-2531