Geometric Dimensioning and Tolerancing (GD&T)

Course Description
Geometric Dimensioning and Tolerancing (GD&T) is a language of symbols used on mechanical engineering drawings to efficiently and accurately communicate geometry requirements for associated features on components and assemblies. GD&T is, and has been, successfully used for many years in the automotive, aerospace, electronics, commercial design, and manufacturing industries. In today’s technically-advanced design, engineering, and manufacturing world, effective and accurate communication is required to ensure successful end products; and understanding the international engineering language of GD&T is essential for communicating in the highly competitive global marketplace.
This fully interactive, narrated course in the fundamentals of GD&T is based on the ASME Y14.5-2009 Standard. Students learn the symbols, modifiers, rules, and concepts of GD&T and develop the ability to read and interpret GD&T symbols that provide information about the function and relationship of part features (critical to the proper fit of mating parts).

Who Should Attend
This course is appropriate for all individuals who create or interpret engineering drawings, including: designers, drafters, engineers, purchasers, estimators, assemblers, and inspectors of parts and assemblies. Particular emphasis is placed on design and manufacture, as well as quality. A working understanding of technical drawings (perspectives, sections, details, etc.) and print reading is suggested.

Learning Objectives
This course contains 29 lessons that explain the terms, symbols, modifiers, rules, and basic concepts of geometric tolerancing as prescribed in ASME Y14.5-2009. Through training, participants with a low to a moderate level of experience with GD&T will gain a common, basic, and operational level of understanding of GD&T. Students will develop the skills and confidence necessary to create and interpret specifications using GD&T.

Course Outline
Basic Principles
Definition and benefits of GD&T
Advanced terminology:

  • Tolerance
  • Geometric characteristic
  • Geometric tolerance
  • Datum
  • Datum feature
  • Datum target
  • Datum reference frame
  • Basic dimension
  • Maximum material condition
  • Least material condition
  • Clearance, interference, and transition fits

Interpreting GD&T Symbols

  • Format of feature control frame
  • Diameter symbol
  • Coordinate vs. position system tolerance zones
  • Effect of material condition on size of geometric tolerance regardless of feature size

Form and Orientation Tolerances
Definition and interpretation of form tolerances:

  • Flatness
  • Straightness
  • Circularity
  • Cylindricity

Definition and interpretation of orientation tolerances:

  • Perpendicularity
  • Angularity
  • Parallelism
  • Application of maximum material condition principle
  • Inspection procedures

Profile, Runout, and Location Tolerances
Definition and interpretation of profile tolerances:

  • Profile of a surface
  • Profile of a line

Definition and interpretation of runout tolerances:

  • Circular runout
  • Total runout

Definition and interpretation of location tolerances:

  • Position
  • Concentricity
  • Symmetry
  • Application of maximum material condition principle
  • Inspection procedures

Course Format
16 hours
Combination lecture and classroom exercises
Available at QSG’s training facilities and on-site at your organization

Course instructors:
Charles A Gillis – Consultant, Design Engineering

Course Evaluations Set 1
Course Evaluations Set 2

Payment Type
Date(s) Attending
Name(s) of Attendee(s)
Name of Company

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