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Geometric Dimensioning and Tolerancing (GD&T) : Basics by Udemy
Learn the essential concepts of GD&T , for mechanical and manufacturing engineers with practice exercises
Course Highlights
- 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
Skills you will learn!
Curriculum
29 Topics
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
11 Topics
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 ?
21 Topics
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
25 Topics
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
Datums
23 Topics
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
Condition for Successful Assembly
Functional Gauging using Virtual condition
Internal and External Boundaries
Exercise : Find the virtual condition of the features of size in drawings
Resultant Condition External Feature of Size at MMC
Resultant Condition Internal Feature of Size at MMC
Bonus Tolerances study for LMC modifier
Resultant and Virtual conditions for LMC and Summary
Example with LMC modifier and calculating minimum wall thickness
Example 2 with LMC modifier and calculating minimum wall thickness
Tolerance Calculations for manufactured part - RFS vs LMC vs MMC with exercise
Actual Mating Envelope
Example of Actual mating envelope further explained
MMC Virtual conditions
23 Topics
Introduction to Planar Straightness and its inspection
Straightness of Cylindrical surface
Straightness of Axis and comparison
Inspection of Axis straightness
Material modifier in Axis straightness
Inspecting Axis straightness with modifier using Functional Gauge
Inspecting Axis straightness
Applications of Straightness control
Straightness applied differently in two directions
Flatness and its Inspection
How Flatness saves money.
Rule 1 and Flatness
Summary of Flatness control
Industry specific example: uses of Flatness in Sheet metal parts
Flatness applied to feature of size
Circularity
Inspecting Circularity
Cylindricity
Inspecting Cylindricity
Examples with cylindricity applied to machine parts
Points on cylindricity and circularity
Difference between Surface straightness control and cylindricity
Form control
12 Topics
Angularity control
Angularity Inspection
Calculating the angle from tolerance zone - orientation
Sheet metal parts - angularity of flanges
Perpendicularity
Inspecting Perpendicularity
Perpendicularity of Feature of size
Parallelism
Inspection of Parallelism
Examples with all Orientation controls applied
Parallelism vs Flatness
Orientation control
9 Topics
Position Control and its Inspection
Comparison between Perpendicularity and position
Concentricity
Symmetry
Example of Orientation + Position control - part 1
Example of Orientation + Position control - part 2
Inspecting position using a functional gauge
Using position to control co axiality + Refinement of position
Location control
8 Topics
Circular Runout
Circular Runout on Perpendicular Face
Total Runout
Total Runout on perpendicular face
Applications of Runout
Examples with Runout - Wheel rim rotating systems
Runout controls both Concentricity and Cylindricity
Runout
6 Topics
Profile of a Line
Profile of a surface and its Inspection
Points on Profile tolerance
Profile control tolerance - Types variations interpretations
Examples with Profile
Profile
9 Topics
Datum Feature Modifier Introduction
Datum feature modifier Example
Datum feature modifier example continued
Datum Shift Example no.2
Datum reference frame is fixed
Benefits of Datum shift
It is not Bonus tolerance
More Examples
Datum Shift
1 Topic
Test your knowledge
5 Topics
Task 1 : Setting GD&T scheme based on Design intent
Task 2 : Write the interpretation of feature control frame in a statement
Task 3 : Interpretation of Drawing - Input information
Task 3 : Quiz
More Drawings of real parts for Interpretation
1 Topic
Bonus - More courses on GD&T - discount coupons
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