GD&T Advanced Course (Pilot Program)

Only Available to Enrolled GD&T Basics Students - Instructor: Tom Geiss

Course description

If you know the fundamentals of GD&T but are looking to become the go-to expert in your office, shop or workplace then you have come to the right place. The GD&T Advanced Course takes your GD&T skillset to the next level by exploring the more specific and complex topics within the ASME Y14.5 Standard. Even though the material will be much more advanced, you can expect to find the same level of engaging, down-to-earth instruction that has helped thousands of students like you learn GD&T with our GD&T Fundamentals Course.  Our lessons go beyond theory to show you how to apply these real world topics in actual applications and designs.  

In this course, we delve into topics such as composite tolerances, fixed and floating tolerance calculations, hole pattern tolerancing, feature boundary calculations, and much more. You can expect to fill in any gaps in knowledge you may have about these more advanced topics while discovering a set of incredibly helpful tools that help you apply GD&T to your designs. 

The GD&T Advanced Course is currently running a private Pilot Program and is only accepting a limited number of new students. Only Students invited to this program will be able to enroll. Please contact us at to for questions about availability and enrollment. 

For the Pilot Program, we will be releasing one complete lesson every two weeks meaning the entire syllabus material will be completed in early to mid-2018. See course syllabus for details.  

- Instructor: Tom Geiss
- Instructor: Tom Geiss
Founder - Pareto Learning / Lead Course Developer GD&T Basics

I have been in the field of Automotive Engineering with several companies including BMW Manufacturing and ZF Transmissions for over 8 years and truly love it. It is fast paced and an incredible field to be in. The ability to work on something for years and then actually get to see it out on the road is very rewarding.

My love of engineering led me to study the fundamentals of what makes a good design. Throughout my entire career, I have been studying Geometric Dimensioning and Tolerancing and how it could be better applied to the automotive and mechanical fields.

It is my belief that if you want to be a great designer, you need to be an expert at GD&T. However, for too long GD&T learning has been way too complicated. The barrier to entry for learning imperative design concepts is too high. In my early years, I continued to study in order to bridge the large gap between GD&T in theory and actually using GD&T in the real world. Everything came together for me when I figured out how GD&T concepts apply to real parts and their functional requirements. Years later, this prompted me to develop GD&T Basics, which explains the most important concepts and show learners how to apply what they learn in practical, real-world situations.

Direct Instructor Question Line

Course Curriculum

Announcements and Resources
Welcome to the Course
A Welcome From Tom
How To Navigate The Material
Initial Pilot Program Survey: Help us Learn a Little About You
GD&T Advanced Syllabus - Lessons & Release Dates - Updated 10/9/17
GD&T Basics PREMIUM Wall Chart
GD&T Pilot Program Forum Posting Guidelines
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Section 2 - Envelopes and Tolerance Boundaries
Envelopes and Boundaries: Part Envelopes Overview
Envelopes and Boundaries: Inner and Outer Boundaries
Review Handout - Envelopes and Boundaries
Quiz - Envelopes and Boundaries
Virtual Condition: Overview and Application Review
Virtual Condition: Formulas and Applying to Features at MMC
Virtual Condition: Applying to Features at LMC and Review
Review Handout (Formulas) - Virtual Condition
Quiz - Virtual Condition
Resultant Condition: Opposing Condition of The VC
Resultant Condition: Checking the RC for MMC Features
Resultant Condition: Checking the RC for LMC Features and Review
Review Handout (Formulas) - Resultant Condition
Quiz - Resultant Condition
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Section 3 - Datums In-Depth
Simultaneous Requirements: The Requirement and When NOT To Use It
Simultaneous Requirements: Example Use and Exceptions
Review Handout - Simultaneous Requirements
Quiz - Simultaneous Requirements
Datum Features and Datum Simulators: Understanding ASME Datum Definitions
Datum Features and Datum Simulators: Classifying Definitions and Material Modifiers
Datum Features and Datum Simulators - How Datums are Established and Review
Review Handout - Datums: Simulators & Features
Quiz - Datum Features and Datum Simulators
Patterns As Datums - Intro and Defining Patters as Datums
Patterns As Datums - Pros and Cons of Use
Patterns As Datums - Redefining an Example Part with Patterns
Patterns As Datums - RFS or MMB Measurement and Review
Review Handout - Patterns as Datums
Quiz - Patterns as Datums
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Section 4 - Datum Modifiers
Material Boundaries Review - Re-Introduction
Material Boundaries Review - 3 Types of Material Boundaries
Material Boundaries Review - Geometric Influence, Datum Precedence and Review
Review Handout - Datum Modifier Overview
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Section 5 - Composite Position Tolerance
Composite Position I (Single Datum) - Introduction to Composite Position
Composite Position I (Single Datum) - Composite Feature Control Frame
Composite Position I (Single Datum) - The PLTZF and FRTZF Explained
Composite Position I (Single Datum) - Tolerance Zones in Detail
Review Handout - Composite Tolerance I (Single FRTZF Datum)
Quiz - Composite Tolerance Part I
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Section 7 - Fixed and Floating Fastener Cases
Projected Tolerance: The Reason We Need Projected Tolerances
Projected Tolerance: Drawing Callout, When to Use, and Review
Review Handout - Projected Tolerances
Quiz - Projected Tolerance
Fixed Fastener Case: Overview and Use of Projected Tolerance
Fixed Fastener Case: Formula and The 60-40 Rule
Fixed Fastener Case: Application Example and Review
Review Handout - Fixed Fasteners
Quiz - Fixed Fastener Case
Floating Fastener Case: Overview and Formula
Floating Fastener Case: Example and Review
Review Handout - Floating Fasteners
Quiz - Floating Fastener Case
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Section 8 - Real-World Applications
Position In-Depth II: Review of Our Original Example and Sim Requirements
Position In-Depth II: Designing and Building Our Gauge
Position In-Depth II: Calculating Maximum Wall Thickness Between Holes
Position In-Depth II: Calculating Minimum Wall Thickness and Review
Review Handout - Position In-Depth Part II
Quiz - Position In-Depth Part II
Zero Tolerance at MMC - Introduction and How it Works
Zero Tolerance at MMC - Example & The Math Behind It
Zero Tolerance at MMC - Converting to Zero Tolerance
Zero Tolerance at MMC - When to Use & Review
Zero Tolerance at MMC Quiz
Review Handout - Zero Tolerance at MMC
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