Geometric Dimensioning and Tolerancing (GD&T) : Basics from Udemy

The course is designed in a way to build from the basic concepts of engineering drawing towards more complex concepts. It starts with explaining the importance of an engineering drawing and going on to explain why GD&T the need has arisen and then a deep dive into the concepts of GD&T

If you are a total beginner the course will build progressively in terms of concepts to capture the core tenets of GD&T.

If you are a seasoned professional then the latter portions of the course will be useful to you

Geometric dimensioning and tolerancing is a body of knowledge and a symbolic language used to communicate design intent on an engineering drawing for manufacturing and inspection.

In this course you will learn , how exactly are the core concepts of GD&T built and how they are applied to drawings with multiple examples .

You will learn and appreciate the importance of the language over the traditional way of dimensioning and learn the possibilities of controlling the parts' variations using various combinations of symbols and controls.

The course will cover the following topics

Overall perspective of what an engineering drawing is and why it is important.
The Need for GD&T then moving towards the introductory concepts of GD&T
A comprehensive comparison of Traditional method of tolerancing vs GD&T
A detailed look at Datums the most important concept in GD&T , How are they created? How are they applied? and what do they mean on the drawing?
A detailed look at Bonus tolerance and concept of virtual condition which lays a key role in Mating parts.
Explanation of Symbols and their inspection methods
- Form
  - Straightness
  - Flatness
  - Circularity and cylindricity
- Orientation
  - Angularity
  - Perpendicularity
  - Parallelism
- Location
  - Position
  - Symmetry and Concentricity
- Runout
- Profile
Finally we will have a look at the concept of Datum feature modifiers or Datum shift.

Each section has a Quiz and you will find practice exercises to practice your GD&T skills .

The course is designed in such a way that each and every point is captured as a sub topic with multiple short lectures which are to the point with condensed information.

At the end of the course, take a quiz with 30 insightful questions which will test your conceptual understanding of the subject.

What's inside

Learning objectives

The basic concepts of geometric dimensioning and tolerancing
How to apply gd&t to a part drawing
Why is gd&t needed and what are its advantages over the traditional method

Practice what is learnt through thought provoking exercises with multiple problem sets in the practice section
Reinforce concepts with 50+ questions
Learn from a seasoned design engineer with real world experience in designing chassis systems

The basic concepts of geometric dimensioning and tolerancing
How to apply gd&t to a part drawing
Why is gd&t needed and what are its advantages over the traditional method
Practice what is learnt through thought provoking exercises with multiple problem sets in the practice section
Reinforce concepts with 50+ questions
Learn from a seasoned design engineer with real world experience in designing chassis systems

Syllabus

Introduction and Basics of Engineering drawing

Introduction

My Learning journey and a Learning guide to GD&T

Importance of Engineering Drawing

The Three Major stakeholders

Quality of Drawing

Cost Of Drawing Error

Examples of Drawing error

3D Model to 2D representation

Orthographic Projection of 3D into 2D and 1st angle and 3rd angle projection

What is Dimensioning?

Concept of Tolerance

Ways of representing tolerance

Fits in Mechanical Assemblies

Types of Fits and Selection

Examples of types of fits

How is Tolerance decided?

An Example on applying preliminary tolerance to a drawing

Drawing with Tolerances

Engineering Drawing Template

Examples of Engineering drawings

Need from the Drawing

What is a Feature?

Examples on Features and non features

Dimension types on drawings

Exercise : Categorize the dimensions Size vs location

How is Inspection of parts done?

Examples of inspection of a part

CMM inspection

Quiz on Basics

Need for GD&T.

Tolerancing a pin with a gauge hole

Issue with Traditional tolerancing - No Relative control of features

Issue with Traditional tolerancing - Ambiguity in Inspection

Issue with Traditional tolerancing - No Assembly consideration

Issue with Traditional tolerancing - No control of Profiles

Why GD&T is needed?

Example of Parallel faces

T slots example

Poppet of Valve example

When to use Co ordinate tolerancing and when not

Quiz : Why GD&T ?

Introductory Concepts of GD&T

Origins of GD&T

Size, Form, Orientation and Location

Example of a square pin : Types of deviations of feature

What is GD&T ? What are the important concepts?

The Feature control Frame

Basic Dimensions

Common Drafting Errors- Basic dimensions and Feature control frame

Identify the drawing error in examples- Basic dimensions and FCF

Feature of Size

Identifying Feature of Size

Identifying Feature of size Example 2

Types of Features and Exercises on Feature of size

Irregular Features of Size and comparison

Comparison between GD&t and non GD&T

Material Conditions

Material conditions exercise along with feature and FOS

Rule 1 of GD&T

Rule 1 Examples and Over riding Rule 1

Rule 1 : Bending of Pin and Exercises in Rule #1

Need for Reference

Introductory concepts

Datums

Datums : Introduction

How Datums are Created

Datum and Datum Feature , Terminology

Datum Reference Frame

Datum reference frame CAD demonstration

Datum Reference frame - 2 Cylindrical feature and 1 Planar feature

Datum Reference frame - 2 Cylindrical feature and 1 Planar feature CAD

Datum Reference Frame - 1 Cylindrical and 2 Planar feature

Datum Reference Frame - 1 Cylindrical and 2 Planar feature CAD

Building Datum Reference frame of a component - Step by step

Datum reference frame exercises

Selection of Datums

Simple Process of Applying Datums

Flowchart in selection of Primary Datum

Examples of Datum Scheme selection

Exercise in selection and sequencing of datums

Tolerance Zone

Define tolerance zones for each control - simple example

How GD&T Helps Inspection?

Tolerance zone Comparison for Position control of Hole

Comparison Summary

Case study : GD&T vs CT scheme of same part Part 1

Case study : GD&T vs CT scheme of same part Part 2

Inspection Requirements

Bonus tolerance and Virtual condition

Material Modifiers on Geometric tolerance

Rule #2

Material Modifiers Example

Shaft Position Tolerance Brief

Bonus Tolerance calculation- Shaft

Hole position tolerance

Bonus tolerance Hole

Virtual Condition of Shaft

Virtual Condition of Hole

Good to know

Know what's good

, what to watch for

, and possible dealbreakers

Examines Geometric dimensioning and tolerancing (GD&T), which is becoming a standard across industries

Helps learners apply GD&T to part drawings

Led by Mufaddal Rasheed, a seasoned design engineer with real-world chassis systems experience

Teaches the basic concepts of GD&T

Taught through a mix of concise lectures, practice exercises, and quizzes

May be useful for total beginners and seasoned professionals alike

Reviews summary

Gd&t: basics primer course

Learners say this primer course on Geometric Dimensioning and Tolerancing (GD&T) offers a helpful introduction to the subject. The material is well-taught, especially the section on inspection methodology, which learners found particularly valuable. Many students noted that the course content was immediately applicable to their jobs, even for those who are not primarily responsible for designing or drawing parts.

Engaging and instructive presentations.

"Begining of course...So far the instructor is dead on accurate with what he's saying."

"still tracking what the instructor is teaching."

"This course was a great primer..."

Immediately applicable to real-world scenarios.

"I've already started using my learnings on the job."

"It's not my primary role to design and draw parts but I look at enough drawings that this course is really helping me out."

Excellent coverage of inspection methods.

"The inspection methodology was the best part of the course IMO."

"It also helped me understand just how important it is to consider the inspection methods when designing the part because it'll be hard to fabricate a compliant part if there is no way to inspect it."

Career center

Learners who complete Geometric Dimensioning and Tolerancing (GD&T) : Basics will develop knowledge and skills that may be useful to these careers:

Design Engineer

Design Engineers devise different kinds of products. They use computer-aided design (CAD) software to create models and drawings, and they often work with other engineers and technicians to bring their designs to life. Geometric Dimensioning and Tolerancing helps Design Engineers to build from the basics of mechanical design to create innovative products with precise specifications and accurate dimensions.

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CAD Technician

CAD Technicians use computer-aided design (CAD) software to create and modify designs for products and structures. Geometric Dimensioning and Tolerancing provides CAD Technicians with the skills to create engineering drawings that accurately communicate design intent.

See salaries and explore the career path for CAD Technician

Machinist

Machinists use machine tools to create and modify metal parts. Geometric Dimensioning and Tolerancing provides Machinists with the skills to interpret engineering drawings and use GD&T symbols to ensure that parts are manufactured according to specifications.

See salaries and explore the career path for Machinist

Product Engineer

Product Engineers take a product from concept to reality, ensuring that it is designed, developed, and manufactured to meet customer requirements. Geometric Dimensioning and Tolerancing provides Product Engineers with the skills to create and interpret engineering drawings, ensuring that products are manufactured according to specifications.

See salaries and explore the career path for Product Engineer

Manufacturing Engineer

Manufacturing Engineers oversee the production of goods, working to improve the efficiency and quality of the manufacturing process. Geometric Dimensioning and Tolerancing provides Manufacturing Engineers with the skills to analyze and interpret engineering drawings, ensuring that products are manufactured according to specifications.

See salaries and explore the career path for Manufacturing Engineer

Tool and Die Maker

Tool and Die Makers create and repair tools, dies, and fixtures used in manufacturing. Geometric Dimensioning and Tolerancing provides Tool and Die Makers with the skills to interpret engineering drawings and use GD&T symbols to ensure that tools and dies are manufactured according to specifications.

See salaries and explore the career path for Tool and Die Maker

Quality Control Inspector

Quality Control Inspectors play a critical role in ensuring the quality of products by inspecting and testing products to ensure they meet specifications. This course provides Quality Control Inspectors with the knowledge and skills to interpret engineering drawings and use GD&T symbols to assess the quality of manufactured parts.

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Metrologist

Metrologists develop and use precision measuring instruments to calibrate and certify measuring equipment. Geometric Dimensioning and Tolerancing provides Metrologists with the skills to interpret engineering drawings and assess the accuracy of measuring equipment.

See salaries and explore the career path for Metrologist

Process Engineer

Process Engineers design and improve manufacturing processes, working to optimize efficiency and reduce costs. Geometric Dimensioning and Tolerancing provides Process Engineers with the skills to analyze and interpret engineering drawings, ensuring that manufacturing processes are designed to produce products that meet specifications.

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Quality Assurance Manager

Quality Assurance Managers develop and implement quality assurance programs to ensure that products and services meet customer requirements. Geometric Dimensioning and Tolerancing provides Quality Assurance Managers with the skills to interpret engineering drawings and assess the quality of manufactured parts.

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Engineering Manager

Engineering Managers lead teams of engineers and technicians, working to develop and produce products. Geometric Dimensioning and Tolerancing provides Engineering Managers with the skills to review and approve engineering drawings, ensuring that products are manufactured according to specifications.

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Mechanical Engineer

Mechanical Engineers analyze their work using the principles of motion, energy, and force ensuring that designs function safely, efficiently, and reliably once they are manufactured. The Geometric Dimensioning and Tolerancing course may be useful to future Mechanical Engineers as it provides foundational knowledge on how to create engineering drawings that accurately communicate design intent.

See salaries and explore the career path for Mechanical Engineer

Project Engineer

Project Engineers plan, coordinate, and execute engineering projects, working with a team of engineers and technicians to bring products to market. Geometric Dimensioning and Tolerancing provides Project Engineers with the skills to review and approve engineering drawings, ensuring that products are manufactured according to specifications.

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Production Supervisor

Production Supervisors oversee the production process, working to ensure that products are manufactured efficiently and according to specifications. Geometric Dimensioning and Tolerancing provides Production Supervisors with the skills to interpret engineering drawings and use GD&T symbols to monitor the quality of manufactured parts.

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Technical Writer

Technical Writers create documentation for products and services, including user manuals, technical reports, and marketing materials. Geometric Dimensioning and Tolerancing may be useful to Technical Writers who need to understand the technical details of products in order to write accurate and informative documentation.

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