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GD&T Fundamentals with Stack & Gaging Applications (Virtual Classroom)

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Learn the basics of geometric dimensioning & tolerancing (GD&T) with stack and gauging applications in this virtual classroom course.

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Dec 01-04th, 2025

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Schedule

This course commences at 9:30 AM and ends at 6:00 PM Eastern each day, with breaks throughout.

Description

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This course is a 4-day immersion into the rules, symbols, and other concepts of the American Standard for Geometric Dimensioning & Tolerancing: ASME Y14.5-2018. The course also covers important differences between older versions of the standard and the current ISO GD&T Standards. Key fundamental rules, all control symbols, datums and datum schemes, basic dimensions, virtual conditions, modifiers, and the infamous Rule #1 are all covered in detail.

This course includes a variety of examples and short exercises that will help you progressively learn more about this unique design language. Participants will work through various exercises and have the opportunity to review engineering drawings during the course.

By participating in this course, you will learn how to successfully:

Describe the tolerance zones defined by each symbol.
Determine when to use Rule #1 to control form and when other controls are appropriate.
Recognize correct syntax for feature control frames.
Relate common gauging and inspection methods to geometric tolerance zones defined by feature control frames.
Correctly apply and interpret the Maximum Material Condition (MMC), Least Material Condition (LMC), and other modifiers.
Assess various datums and datum schemes against product functionality and manufacturing and inspection performance.
Recognize the need for product-specific GD&T guidelines and list the steps required to create them.

Who should attend?

You should have some familiarity with engineering drawings, but you do not need any previous GD&T experience. Many participants looking for advanced classes discover that their GD&T skills are challenged by the fast pace and in-depth coverage of our fundamentals course. Come prepared to work hard and learn a lot, even if it's not your first time through a GD&T class.

Course Materials (included in purchase of course)

Digital course notes via ASME’s Learning Platform

This ASME Virtual Classroom course is held live with an instructor on our online learning platform. A Certificate of Completion will be issued to registrants who successfully attend and complete the course

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Outline

Introduction

Welcome to Geometric Dimensioning & Tolerancing
The 12 Geometric Controls Exercise: —Students draw the symbols, names, and feature control frame examples and complete a list of tolerance zone modifiers.
Exercise debrief: Overview of everything/job aid.
GD&T Tool Categories vs. Geometric Attributes: Use a matrix to avoid confusion!

Features of Size vs. Surfaces (Big Map of the GD&T World)

What is a feature, exactly?
What’s the difference between a surface and a feature of size?
Organizing features of size:
What’s “Rule #1”? Size controls form, too.
Does ISO have a Rule #1 and is it different than ASME’s? ISO has a Rule #1 that says form is independent of size.
Exercises & debrief

Controlling Surface Form

Flatness & Straightness
Cylindricity & Roundness
Profile as a Form Control
Exercises (Homework)
Surface form exercise debrief

Datums

What are they? Theoretical planes, lines, or points used as origins for locating and orienting other features.
Why do we need them? —You can’t locate or orient two related features to each other without designating one of them as the origin and then controlling the other feature in relation to the first.
Get the definitions right: datums, datum features, fixtures, and gages
Surfaces used as datums
Features of size used as datums: To M or not to M, that is the question Sometimes you’re OK when shift happens.
Patterns of features used as a datum
Exercises and applications
How do you select a datum? First follow the function.
How do you simulate a datum? Match the way you reference it and simulate it to the way it functions.
More exercises & debrief

Controlling Surface Orientation

Perpendicularity
Angularity & Parallelism
What’s the tangent plane modifier for? Changing what, exactly, has to be in the tolerance zone.
Exercises & debrief

Orienting a feature of size

Definition
To M or not to M, that is the question. If a feature’s size varies in a way that helps the fit, can you count that size variation as additional geometric tolerance?
Round and square examples
Inspection

Using FOS and Surfaces controlled with profile as datums