Cohort 3 Advanced GD&T

Nov 3 - 7, 2025

MATERIALS

Course slides supplied by University of Hartford

COURSE PREREQUISITE(S)

PW Certificate Course on Fundamentals of Manufacturing Metrology OR Familiarity with the course contents

COURSE OVERVIEW

GD&T is a system for defining and communicating engineering tolerances by using a symbolic language on engineering drawings that describe nominal (theoretically perfect) geometry of controlled features, as well as their allowable variation in size, other geometrical characteristics (form, orientation, location) and variation between features. Per this language, dimensions are selected to suit function and mating relationship of a part and are subject to a unique interpretation. The course focuses on the fundamental understanding of the 14 tolerances and their inspection techniques, concepts of datums, features, feature modifiers, datum modifiers, datum boundaries, and design of functional gauging. Practical aspects of different call-outs are discussed with opportunity for hands-on experience.

TARGET AUDIENCE

Managers, Engineers, Technicians Mechanical Design/Product Definition

 Aerodynamics

 Metrology

 Structures & Dynamics

 Manufacturing

 Quality Assurance

DETAILED AGENDA

Review of Fundamentals of GD&T

Drawing Rules, Inch/Metric Dimensioning Units, Angular Units, Features and Features of Size, Datums, Terms used in GD&T, Bonus Tolerance, Mathematical Definitions and Inspection Techniques of 14 Geometric Characteristic Symbols, additional symbols used in GD&T

Form – Flatness, Straightness, Circularity, Cylindricity, Rule#1

Orientation – Perpendicularity, Parallelism, Angularity

Location – Position, Symmetry, Concentricity, Coaxiality

Runout – Circular Runout, Total Runout

Profile – Profile of a Line, Profile of a Surface

Hands-on laboratory exercise

In-class exercises 1, 2, 3, 4

Datum Feature Selection Criteria, Understanding feature modifier for bonus tolerancing, Worst-case inner and outer boundaries for internal and external features of size, Virtual and Resultant Conditions, 3-2-1 Principle for Datums at RMB, Effect of datum order of precedence at RMB

In-class exercises 5, 6

Design of functional gauge for feature MMC modifier with RMB, Changes in functional gauge design based on order of precedence of datums at RMB, Datum boundary with modifiers, MMB and LMB, calculation of datum shift tolerances, design of functional gauges with feature modifier, MMB, LMB and different order of precedence of datums.

Hands-on laboratory exercise

In-class exercises 7, 8

Calculations of minimum/Maximum wall thicknesses, feature-to-feature distances, Zero Positional Tolerancing, Multiple Patterns of Features, Datum Targets and Irregular Surfaces, Fastener formulas (floating and fixed) and screw threads, projected tolerance zone

In-class exercises 9, 10, 11

1D and 2D Stack-up analyses for assembly purposes, worst-case arithmetic tolerancing, statistical tolerancing,

In-class exercise 12, Application Exercises (including flexible parts)

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