GD&T Course

GD&T Part 1 (Basic)

Course Description
Intended for practicing professionals who create drawing specifications or read drawings, this course helps students make sense of a topic that some find overwhelming. In this comprehensive class, the key principles of Geometric Dimensioning & Tolerancing (GD&T) are explained and brought down to the real world. The delivery includes lots of illustrations and animations to help with conveying concepts. More than simply memorizing symbols, students leave this course with a working understanding of how the system works and feel confident fully understanding drawing requirements and creating their own tolerancing schemes for parts.

This course provides lots of practical hands-on exercises to drive home the concepts and encourage questions and effective discussions. The exercises go beyond the theory to show how tolerancing works on real working parts.

Who Should Attend
This course is designed for anyone in engineering, manufacturing, and quality assurance who needs to define engineering requirements with drawings, or properly interpret and act upon the information found in engineering drawings.

Learning Objectives
Through training, participants will learn the following:

  • Visualize the different types of variation that exist on parts, recognize the limitations of numeric tolerances and understand the need for geometric tolerances.
  • Analyze tolerances expressed numerically and calculate minimum and maximum allowable values for dimensions.
  • Understand and apply the symbols used with the geometric system of tolerances.
  • Recognize basic dimensions on prints and properly interpret their meaning.
  • Properly evaluate inspection data in light of tolerance zones defined by geometric controls.
  • Apply tolerances with bonus when suited to the application and properly interpret tolerances when bonus tolerance applies.
  • Identify and properly interpret geometric controls on location, orientation, form, profile & runout.
  • Recognize datum feature identifiers applied to features with size and surfaces.
  • Identify and interpret the datum reference frame including order of precedence.
  • Create specifications using appropriate geometric tolerances and datum reference frames.

Course Outline

Fundamentals of GD&T
Types of variation and how they’re controlled
Features of size and surfaces
Definitions of maximum material condition (MMC) and least material condition (LMC)

Limits of Size
Rule #1
Local size and actual mating envelope
Size tolerances vs. Location tolerances

How the Geometric System Works
Overview of geometric tolerances
Comparison to plus/minus tolerances
Material modifiers and bonus tolerance

Datums and the Datum Reference Frame
Datums
Datum features
Establishing datum planes and datum axes from features
Establishing a datum reference frame

Position Inspection
Interpreting inspection results and geometric tolerances

Tolerances of Orientation
Parallelism applied to surfaces and features of size
Perpendicularity applied to surfaces and features of size
Angularity applied to surfaces and features of size
Examples of their use and meaning as well as verification principles

Virtual Condition and Material Boundary Modifiers
Virtual condition
MMB and LMB
Development of datum reference frames RMB and MMB
Rotational control
Translation modifier

Datum Targets and Irregular Datum Surfaces
Inclined datum features
Contoured datum features
Datum targets
Restrained conditions

Advanced Datum Reference Frame Concepts
Common datum features
Two holes as datum feature
Hole and slot as datum features
Pattern of holes as datum feature
Datum features referenced individually

Tolerances of Form
Flatness applied to surfaces and features of size
Straightness applied to surfaces and features of size
Circularity
Cylindricity
Examples of their use and meaning as well as verification principles

Tolerances of Profile
Profile of a line
Profile of a surface
Equally disposed and unequally disposed profile tolerances
Profile tolerances applied to multiple surfaces
Composite and two-segment profile tolerances
Examples of various simple and complex surfaces
Examples of their use and meaning as well as verification principles

Tolerances of Position
Position tolerance, comparison and conversion from conventional tolerancing
Applications and examples of position used for various features
Composite and two-segment position tolerances
Floating and fixed fasteners
Projected tolerance zone
Examples of its use and meaning as well as verification principles

Coaxial Controls
Circular runout
Total runout
Comparison of position, profile for coaxial features
Concentricity and symmetry tolerances (prior practice)

Prerequisites
A Basic Print Reading workshop/course is recommended as a prerequisite. The Basic GD&T course does not review general print-reading concepts such as views, title blocks, and notes. Students who have become familiar with finding and understanding information on prints through on-the-job experience will be prepared for this course.

Course Format
24 hours: 3 in-person sessions or 5 virtual sessions
Instructor-led classroom training, in-person and in-groups, with lots of discussion and working sessions to practice learned skills.
Available at QSG’s training facilities, virtually, or on-site at your organization

Textbook: Geo Tol Pro 2020, TCI

Instructor: Charles A. Gillis, P.E. – Senior Consultant, Mechanical Design Engineering

8:00am–4:00pm (EST) each day ON-SITE
9:00am–2:00pm (EST) each day VIRTUAL
Customer site: times vary


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



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