Geometric Dimensioning & Tolerancing (GD&T) Fundamentals LIVE Web Training

An Instructor Led LIVE Web Based Training Course

This live web based training course is designed to help understand and interpret the fundamentals of GD&T. It is based on the ASME Y14.5 – 2009 standard. Formally the ASME Y14.5M - 1994 standard.

By definition, GD&T establishes uniform practices for stating and interpreting dimensions, tolerancing, and related requirements for use on engineering drawings and in related documents.


Course details and prerequisites:

Duration: 2 Day (5 hours/day)
Type: Instructor Led LIVE Web
Level: Basic


  • Basic understanding of mechanical drawings
Who should attend this course:
  • This course is a valuable tool to any individual who has to create or interpret engineering drawings; for product and gauge designers; CMM operators and quality assurance personnel.


Course Agenda

Lesson 1: Course Introduction

  • Course objectives, benefits and general overview of GD&T principles, and general dimensioning practices

Lesson 2: Characteristics and Symbols

  • Detailed explanation of types of tolerances and the individual geometric characteristic symbols and their tolerance zones

Lesson 3: Feature Control Frames and Placement of Datums

  • Feature control frame breakdown
  • Placement of feature control frames on drawings
  • Identifying datum surfaces and datum features and qualifying vs. designated datums

Lesson: 4 Modifiers

  • MMC, LMC, RFS and how they affect tolerance zones when applied in feature control frames
  • Locating pin positional exercise and functional gauge design exercise

Lesson 5: Inspection Methods

  • Lesson designed to emphasize the geometric characteristics and give one method of inspection for each characteristic
  • Further explanation on profile tolerances (all round, between points, unequally disposed)
  • Comparison of different characteristics for application purposes

Lesson 6: Datums

  • Datum Reference Frame and establishing datums and datum selection
  • Partial datums, datum target points, and Datum modifiers (MMB, LMB and RMB)

Lesson 7: Positional Charts and calculations

  • Comparison of coordinate tolerances to diametrical tolerances

Lesson 8: Composite Feature Control Frames

  • Composite feature control frames compared to segmented feature control frames

Lesson 9: Review exercises and Design Applications

  • Series of review exercises and additional design of mating parts exercises