Public Program
GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
Course Introduction
Geometric dimensioning and tolerancing (GD&T) is a language used on mechanical engineering drawings composed of symbols that are used to efficiently and accurately communicate geometry requirements for associated features on components and assemblies. GD&T is, and has been, successfully used for many years in the automotive, aerospace, electronic and the commercial design and manufacturing industries.
Success oriented industries and organizations which, require accurate and common lines of communications between engineering, design, manufacturing and quality should consider geometric dimensioning and tolerancing (GD&T) as their mechanical drawing standard.
Course objective
At the conclusion of this 2 days program, participants will be able to:
- Gain knowledge on what GD&T is all about
- Explain the benefits of geometric tolerancing
- Learn how to apply GD&T in their job
- Able to interpret customers requirements from the design drawing
- Understand the problems in manufacturability
- Be reminded of the Do’s & Don’t’s of proper tolerancing
- Able to set quality control criteria from design drawing
- Identify datum features and determine their order of precedence
- Identify and interpret each of the characteristic symbols
- Describe the material condition modifiers and how “bonus” tolerance occurs
- Correctly interpret GD&T feature control frames, and explain the impact on manufacturing and inspection
Course Content
Day 1: 9am – 5pm
Introduction to GD&T
i. Limitations of coordinate tolerancing
ii. Advantages of GD&T
iii. Exercise 1
Standards
i. Latest GD&T revision & governing body
ii. Exercise 2
Dimensioning & tolerancing fundamentals
i. Basic dimension
ii. Critical dimension
iii. Reference dimension
iv. Feature control frame
v. Exercise 3
Common symbols used in GD&T
i. New symbols from rev 2009 Y14.5
ii. Exercise 4
Rules for drawing & design
i. Rule #1
ii. Rule #2
iii. Bonus Tolerance
iv. GD&T applied to a feature of size
v. Bonus and the MMC modifier
vi. Virtual condition
vii. Gauging and inspection using GD&T
viii. Exercise 5
Datums
i. Datum vs. datum feature
ii. The datum reference frame
iii. Primary, secondary, and tertiary datums
iv. Exercise 6
Day 2: 9am – 5pm
Forms
i. Straightness
a. Straightness Brief
b. Line Element Straightness
c. Design
d. Tooling / production
e. Inspection
ii Flatness
a. Flatness Brief
b. Surface Flatness
c. Design
d. Tooling / production
e. Inspection
iii Roundness
iv Cylindricity
v Exercise 7
Profiles
i. Line profile
ii. Surface profile
iii. Exercise 8
Orientation
i. Angularity
ii. Perpendicularity
iii. Parellelism
iv. Exercise 9
Location
i. Position
a. True position
b. . Position tolerance RFS
c. Using MMC or LMC
d. The “boundary” concept
e. The pitch diameter rule
ii Symmetry
iii Concentricity
iv Exercise 10
Runout
i. Circular runout
ii. Total runout
iii. Exercise 11
Common issues/errors faced
i. Exercise 12
- 17 & 18 February 2025
- MON & TUE
- 9AM - 5PM
- WYNDHAM GRAND BANGSAR KUALA LUMPUR HOTEL
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