GD&T Training Courses

Level 1 GD&T Fundamentals Course   [20 hours]

A thorough and rigorous treatment of the system of Geometric Dimensioning and Tolerancing concepts, rules, legal implications, tools and techniques are presented in detail from design, inspection, and concurrent engineering points of view. (ASME or ISO GD&T)

  • Understand shortcomings of +/- dimensioning and tolerancing and how GD&T eliminates these deficiencies
  • Introduction to functional dimensioning and tolerancing
  • Detailed explanation of datums and datum reference frames
  • Start with GD&T rules and simple concepts and build up to system level
  • Features, features of size, geometric tolerances and tolerance zones are covered in detail
  • Leads to a thorough understanding of GD&T basics
  • Presented from design, manufacturing, quality, inspection, and assembly points of view

Level 2 GD&T Applications Course   [20 hours]

Covers the more advanced topics, application issues, pros and cons of alternate strategies, effects on downstream processes and the supply chain, and includes many application-based exercises. (ASME or ISO GD&T)

  • Application and implications of Functional Dimensioning and Tolerancing schemes
  • How to apply GD&T functionally to parts and mating parts in assemblies
  • Composite tolerancing
  • Understanding alternative strategies for tolerancing and managing variation
  • Pros, cons and tradeoffs of the alternatives on downstream operations such as manufacturing and inspection, and cost implications of the above

Level 3 Advanced GD&T Course     [20 hours]

Advanced topics, problems and challenges in Dimensioning and Tolerancing, advanced feature types and tolerancing techniques, challenges in metrology, mathematical concepts, effects on Tolerance Stackups, mating part applications, and optional strategies. (ASME)

  • Implications on downstream processes including manufacturing, inspection, assembly, service, & supply chain
  • Deeper understanding of GD&T and its business implications, tradeoffs and pros and cons of different approaches
  • Advanced GD&T tools and methods
  • Alternate strategies for managing more complex geometry
  • Deeper discussion of CAD model geometry and its role in product definition and GD&T
  • Extending and adapting GD&T methods for your products
  • In-depth discussion of your products, drawings, models, & processes

Level 4 Tolerance Analysis Course   [20 hours]

Understand how to calculate and manage variation and its implications on product performance. (ASME or ISO GD&T)

  • Explanation, comparison and calculation of worst-case and statistical techniques
  • How to perform stackups with +\- and GD&T
  • Address assemblability, fit, maintaining clearance, ensuring contact, maintaining wall thickness & machining stock, alignment
  • Compare dimensioning & tolerancing & design strategies
  • Methods to model geometric variation from dimensions and tolerances, GD&T, and assembly processes
  • Understand sources of variation and its effects on assemblies
  • Assembly modeling process, determining if the design, GD&T, and assembly process will yield acceptable results
  • How to correct geometry problems found through analysis
  • Understand, calculate, and model the cumulative variation
  • Know if the design and GD&T specified leads to parts and assemblies that will meet their intended requirements

GD&T Overview Course   [8 hours]

Overview of core topics of GD&T fundamentals.

  • Why GD&T is needed and how it differs from +/-
  • Plus and minus deficiencies
  • Features and features of size
  • GD&T rules
  • Legal issues relating to drawings and models
  • Datums, datum features, datum reference frames
  • Understanding form, size, orientation, and location, and
  • Overview of geometric tolerancing
  • Discuss GD&T and its implications on purchasing, supply chain, inspection requirements, and other business issues

ISO vs. ASME GD&T Practices Workshop   [8-16 hours]

Comparison of the ISO GPS and ASME Y14.5 GD&T systems and differences in their philosophy. Comparison of symbology, terminology, tools, techniques, and implications of these on defining functional requirements and downstream processes.

Get a Quote or Contact Sigmetrix at