GD&T Course

Geometric Dimensioning and Tolerancing (GD&T) – 3 day

Course Description
Intended for practicing professionals who create drawing specifications or read drawings, this Geometric Dimensioning and Tolerancing (GD&T) course helps participants make sense of a topic that some find overwhelming. In this completely re-worked class, the key principles are explained and brought down to the real world. The GD&T training delivery has been spread out to 3 days, with some added content and lots of added illustrations and animations to help with conveying concepts. More than simply memorizing symbols,participants 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 GD&T training course is appropriate for design, manufacturing and project engineers, quality control personnel, engineering managers and supervisors. CAD draftspersons, tool designers, technical inspectors, mechanical engineering technicians, machine shop and tool room supervisors will also find the training beneficial.

Learning Objectives
Upon completion of GD&T training, participants will be able to:

  • 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.
  • Virtual Condition and Material Boundary Modifiers: Virtual condition, MMB and LMB, development of datum reference frames RMB and MMB, rotational control, translation modifier.
  • Tolerances of Orientation: Controls of parallelism, perpendicularity, and angularity applied to surfaces and features of size, examples on their use and meaning as well as verification principles.
  • Datum Targets and Irregular Datum Surfaces: Inclined, contoured datum features, datum targets, restrained conditions, moveable datum targets.
  • Advanced Datum Reference Frame Concepts: Common datum features, two holes as datum feature, hole and slot as datum features, pattern of holes, datum features referenced individually, customized datum reference frame.
  • Tolerances of Form: Controls of flatness, straightness, circularity and cylindricity, examples on how they are specified, their meaning and principles of verification, application to features of size and surfaces.
  • Tolerances of Profile: Controls of profile of a line and profile of a surface, equally disposed and unequally disposed profile tolerances, profile tolerances applied to multiple surfaces, examples of various simple and complex surfaces, nonuniform profile tolerances, dynamic profile.
  • Tolerances of Position: Controls of position, comparison and conversion from conventional tolerancing, applications and examples of position used for various features, composite position tolerances, multiple single segment position tolerances, floating and fixed fasteners, projected tolerance zone.
  • Coaxial Controls: Controls of circular runout and total runout. Position for coaxial features, profile for coaxial features, concentricity and symmetry tolerances (prior practice).

Course Delivery Details:

  • Class Duration (live): 3 Days (24 Hours), 8:00am – 4:00pm (EST) each day
  • Class Duration (online): 5x 5-hour sessions (24 hours), 9:00am – 2:00pm (EST) each day
  • Prerequisites & Preparations: 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.
  • Modes of Teaching and Learning: Lecture/discussion, Individual work sessions, Group work sessions, large print review
  • Course instructor:Charles A. Gillis – Senior Consultant, Design Engineering
  • Textbook: Geo Tol Pro 2020, TCI

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