Geometric Dimensioning & Tolerancing (GD&T) ASME Y 14.5-2009

Name: Geometric Dimensioning & Tolerancing (GD&T) ASME Y 14.5-2009
Rating: 3.3 (22 reviews)

This course teaches a simple framework that allows students to understand how GDT is used to improve design & tolerances

Created byHashim Khan

Last updated 11/2024

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What you'll learn

Basics of Engineering Drawings and related documentation practices
How to define tolerances to achieve interchangeability
Inspection and related QC Functions (GD&T)
Manufacturing aspects
Dimensional management
ASME Y14.5 standard applications

Course content

4 sections • 28 lectures • 1h 46m total length

Introduction1:23
Learn geometric dimensioning and tolerancing using ASME Y14.5-2009 principles, applying tolerance rules and symbology with G, D and T on drawings and documentation.
Course Overview1:28
Explore geometric dimensioning and tolerancing per ASME Y 14.5-2009, covering 14 basic symbols, datum reference frame, true position at MSI, LMC and Ahrefs, and boundary concepts including MMP.
What is GD&T1:32
Geometric dimensioning and tolerancing uses a symbolic language with 14 basic symbols to communicate designer intent to manufacturers and quality inspectors, controlling variation in form, orientation, location, and runout.
Basic Symbology of GD&T4:51
Learn the 14 geometric characteristic symbols of GD&T (G, D, and T) and how they govern form, orientation, location, and runout, with emphasis on datum reference frame and tolerance hierarchy.
Importance of Tolerances & GDT1:59
Explore how tolerances and geometric dimensioning and tolerancing (gdt) enable interchangeability across components in cars and complex systems, guided by the ASME standard and practical examples.
GDT History1:48
Trace the history of GD&T and the evolution of ASME Y 14.5-2009 as the authoritative design language, outlining symbols, rules, definitions, and requirements for engineering drawings and digital data.
Definitions & Rules6:17
Explore the basic symbols and rules of gd&t, including the feature control frame, datums, and modifiers such as mmc, lmc, and rfs, plus rule one.
Why GD&T?16:14
Examine the deficiencies of plus-minus tolerancing and see how geometric dimensioning and tolerancing, with true position, circular zones, and datum reference frames, ensures part function and interchangeability in assembly.
Introduction to Datum and DRF0:31
Explore the concept of datum and datum reference frames (DRF) within G, D and T, as outlined in GD&T and ASME Y 14.5-2009 chapter four.
Why GDT - FoS6:49
Explore the shortcomings of the plus-minus sizing system and how GD&T, via feature of size and clear datum references, resolves ambiguity and defines functional requirements.
Metric vs Inch system5:23
Explore how ASME Y 14.5-2009 is unit independent, applying to both inch and metric dimensions, with rules for decimals, zero placement, and tolerance schemes.
Center and Surface Datum3:11
Examine how to declare surfaces and axes as datum using datum triangles, dots, and dimension lines, and distinguish center planes and center lines as datums in GD&T.

Important Definitions Datum and DRF4:21
Define datum as a theoretically exact reference derived from a datum feature to support tolerances. Identify datum feature simulators, simulated datums, and theoretical datums, and perform the datum simulation.
Datum Designation0:54
Learn to designate a datum surface on a drawing using a lettered box and triangle, with attachments to the datum feature or the feature control frame.
DRF, Datum Order8:49
Examine the datum reference frame, primary secondary tertiary datums, and datum triangle, and see how datum order, runout, and combination affect alignment and gd&t communication.

DoF2:19
Explore the degree of freedom concept in GD&T, including the six DOF: translations x, y, z and rotations pitch, yaw, roll, constrained by datums and datum reference frames.
DoF and DRF5:01
Examine a datum reference frame on x, y, z axes and show how a planar primary datum constrains three of six degrees of freedom, with a secondary datum adding constraints.
DoF for Common Types of Features3:22
Explore how degrees of freedom guide design and datum feature selection in geometric dimensioning and tolerancing, detailing how planes, cylinders, spheres, conical features, and linear extended features constrain motion.
DoF Exampes4:08
Examine how degrees of freedom are controlled by primary, secondary, and tertiary datums in GD&T, illustrated with holes, pins, and gauges.
Datum & DoF - DRF2:32
Datum & DoF Planar Primary Datum1:00
Assign a private bottom datum and a pin as a secondary datum to constrain all five degrees of freedom, leaving only rotation about the axis.
Datum & DOF - Primary Datum Cylindrical1:11
Using a cylindrical primary datum, this example shows a shaft fixed to a base that prevents left-right and forward-backward movement, while rotation and up-down motion remain unconstrained degrees of freedom.

Projected Tolerance Zone5:16
Use the projected tolerance zone to extend the position tolerance for a hole by 25 mm, incorporating the circled P symbol to ensure proper assembly despite angular variation.
Introduction2:16
Explore the first formulas for true position and other GD&T parameters, and compare fixed versus floating fasteners while reviewing symbols, groups, joining methods, and interchangeability.
Fixed Vs Floating Fasteners3:17
Compare fixed and floating fasteners, determine clearance hole sizes, and apply MMC and true position formulas to allocate total clearance between parts.
Clearance Hole Size3:20
Explain how clearance hole sizes are set by SMB 18.2.8 and ISO 273 using metric and inch fasteners, with three fits and MMC-based tolerances S12, H13, and H14.
Application of Fastener Formula3:53
Apply the fixed fastener formula to a two-hole, two-plate assembly, determining true position tolerances from clearance hole and fastener sizes using MMC, datum reference frame, and interchangeability.
Conclusion3:23
Apply the fixed Poisson formula to calculate position tolerances for mating green and pink parts, using primary datums, secondary/tertiary surfaces, MMC sizes, true position, and projected tolerance zones to ensure interchangeability.

Requirements

Basic knowledge of engineering drawings is a pre-requisite for this course

Description

GD&T Fundamentals teaches a simple framework that allows students to not only understand how GD&T is used, but also why GD&T improves the design, manufacturing & inspection processes. The course is focused on practical knowledge and uses real-world examples. GD&T Fundamentals doesn’t overwhelm students with every GD&T concept – the lessons are designed to teach students only the concepts and terminology necessary to do their jobs better and improve their working accordingly. This course is designed to be very approachable and geared towards everyone from entry-level to those with intermediate experience. To take this training, you should have some experience in a design, production or inspection environment working with engineering drawings. You should also be able to understand how parts are represented and viewed on a print. No prior GD&T knowledge is required, though!

By the time you complete this course, you’ll have gained a mental framework and understanding that simplifies 95% of all GD&T . You would be understanding the main requirements and terminology of the ASME Y14.5 Standard in terms of plain English Learn all 14 major GD&T symbols and understand how to apply the symbols that are useful and to avoid the ones that aren’t. Understand GD&T Feature Control Frames and how they affect manufacturing and inspection Know how Max Material Condition creates bonus tolerance while maintaining a functional part Understand datums and how they are applied on drawings for design, manufacturing, and inspection Understand how GD&T is applied on physical parts and real-world drawings Know best practices and have a realistic approach for using GD&T in your job You’ll leave this course equipped to read, interpret, and understand GD&T on real engineering drawings—and empowered to work more confidently, communicate more clearly, and produce parts more efficiently.

Who this course is for:

Design egineers, QA/QC personnel, manufacturing personnel, draftsmen

Geometric Dimensioning & Tolerancing (GD&T) ASME Y 14.5-2009

What you'll learn

Explore related topics

Course content

Introductory Session12 lectures • 51min

Datum & Datum Reference Frame (DRF)3 lectures • 14min

Degree of Freedom7 lectures • 20min

Introduction to Fasteners Formaulas6 lectures • 21min

Requirements

Description

Who this course is for: