GD&T stands for Geometric Dimensioning and Tolerancing, as defined by ASME Y14.5.Geometric tolerancing, is an exact language that enables designers to “say what they mean” on a drawing, thus improving product designs. Production uses the language to interpret the design intent, and Inspection looks to the language to determine set up. GD&T is a method for stating and interpreting mechanical engineering design requirements. GD&T is a very useful & efficient tool to make engineering drawings a better means of communication from design through manufacturing and inspection. GD&T: An International Language & and an Exact Language that provides Uniformity.

1. Day-2, Morning
Simultaneous Requirements for Combined parts
Profile Control
 Profile tolerancing
- Computation of holes in relation to leading hole in
various materials condition.
 Composite Position Tolerance
- Application of the condition to achieve better
machine settings.
Exercise
 Computation and interpretation
Geometric Dimensioning & Tolerancing (GD&T)
Two Single Segment Feature Control Frame
- Interpretation and understanding
- Exercises and examples - Assessment test:
-Using GD&T on various component, interpret fabrication of parts successfully
considering business factors.

2. Day-2, Noon
Geometric Dimensioning & Tolerancing (GD&T)
Inspection for proper Tolerances &
Dimensioning
- Appropriate and correct approach of during
inspection.
- Correct position and method of measurement of
parts based on the technical drawings.
- Datum & relevant Selection
- Definition of datum reference frame –
Definition of datum reference points
-Decision Diagrams
Study of Sample Drawings
-Exercise and Workshop: Interpretation of sample
mechanical drawings.
-Convert from +/- to true position tolerancing
Conclusion and Q & A session
End of day 2

3. Why GD&T?
(Based on ASME Y14.5M-1994)
Geometric Dimensioning & Tolerancing (GD&T)
To allow Participants to master
techniques of GD&T in the
ASME standard to;
integrate smoothly into
engineering design applications
and modern inspection systems
at work.
Provide Participants with Fundamental concepts of GD&T
to express, understand and interpret drawing requirements
using GD&T to ANSI / ASME Y14.5M Standards.

4. In-depth knowledge of GD&T application allows
optimum form, fit & function between the various
complex pieces of parts assembly.
Starting with basic principles
in coordinate dimensioning
& tolerancing and
progressing on these
principles to understand &
apply GD&T requirements to
ad concepts to real work
applications.
Application & Advantages of GD&T
Geometric Dimensioning & Tolerancing (GD&T)

5. Review of Day 1
GD&T Rules Based System
The Definitions
From 1.3.11
Geometric Dimensioning & Tolerancing (GD&T)

6. Fundamental Rules. -application examples on sizes
and dimensions.
Fundamental Rules
From 1.4(e)
Geometric Dimensioning & Tolerancing (GD&T)
Dimensioning and
tolerencing philosophy.
Review of Day 1
GD&T Rules Based System

7. Rules for Drawing and Designs
Envelope Principle.
• Rules for Gear and Splines.
• Regardless of feature size.(RFS)
settings
• Maximum Material Condition (MMC)
• Least Material Condition (LMC).
• Virtual Condition and Resultant
Condition.
Geometric Dimensioning & Tolerancing (GD&T)
The Rules
Until slide 15 Rule#1
Review of Day 1
GD&T Rules Based System

8. Common Symbols in GD&T.
List of symbols and their interpretation Assessment
Common Symbols in GD&T
Exercise
Study of tolerancing condition
Maximum Material Condition (MMC),
Least Material Condition (LMC) and
Regardless of Feature Size (RFS)
application and interpretation
GD&T Symbols

9. Common Symbols in GD&T.
List of symbols and their interpretation Assessment
Common Symbols in GD&T
Exercise
Study of tolerancing condition
Maximum Material Condition (MMC),
Least Material Condition (LMC) and
Regardless of Feature Size (RFS)
application and interpretation
Modifying Symbols

10. Standards for GD & T. – ASME, - ISO, - Din
ASME Standards
ASME Y14.5 – Dimensioning and
Tolerancing
ASME Y14.5M-1994 Dimensioning and
Tolerancing
ASME Y14.5.1M-1994 Mathematical
Definition of Dimensioning and
Tolerancing Principles
Many multi-national corporations use ASME Y14.5
(ASME Y14.5M-1994 or ASME Y14.5-2009) as their
GD&T standard worldwide for all of their international
operations.
The ASME Y14.5
standard is
considered the
authoritative
guideline for the
design language of
GD&T.
ASME Y14.5-2009 is a replacement of ASME Y14.5M-1994.

11. ISO 1101:2004
Geometrical Tolerancing.
Standards for GD & T. – ASME, - ISO, - Din
The International Organization for Standardization (ISO)
also has a version of GD&T, which they call ISO 1101
Geometrical Dimensioning and Tolerancing (GD&T).
At present the ISO
standards do not recognize
the interpretation of
concentricity and symmetry
as defined in the ASME
Y14.5M 1994 standard.
The concentricity and symmetry characteristics in ISO
have the same interpretations as the position
characteristic in the ASME Y14.5M 1994 standard.

12. Simultaneous Requirements for Combined parts
Profile tolerancing
- Computation of holes in
relation to leading hole in
various materials condition.
Geometric Dimensioning & Tolerancing (GD&T)
Day-2, Morning
Profile Control

13. Simultaneous Requirements for Combined parts
Composite Position Tolerance
- Application of the
condition to achieve better
machine settings.
Geometric Dimensioning & Tolerancing (GD&T)
Day-2, Morning
Position Control
Until slide 14

14. Simultaneous Requirements for Combined parts
Exercise
 Computation and interpretation
Envelope Principle.
• Rules for Gear and Splines.
• Regardless of feature size.(RFS)
settings
• Maximum Material Condition (MMC)
• Least Material Condition (LMC).
• Virtual Condition and Resultant
Condition.
Geometric Dimensioning & Tolerancing (GD&T)
Exercise, Rules
After Slide 16
Rule#2
Day-2, Morning

15. Day-Two Noon
Geometric Dimensioning & Tolerancing (GD&T)
Inspection for proper Tolerances &
Dimensioning
- Appropriate and correct approach
of during inspection.
-Correct position and method of
measurement of parts based on the
technical drawings.
-Datum & relevant Selection
-- Definition of datum reference
frame –
Dimension
After Slide 10

16. Day-Two Noon
Geometric Dimensioning & Tolerancing (GD&T)
Definition of datum reference points
-Decision Diagrams
Study of Sample Drawings
1 Datum New
RFS after MMC

17. Day-Two Noon
Geometric Dimensioning & Tolerancing (GD&T)
Exercise and Workshop:
Interpretation of sample mechanical
drawings.
-Convert from +/- to true position
tolerancing
Conclusion and Q & A session
End of day 2
Workshop Examples

18. Thank You!
End of Day 2
Geometric Dimensioning & Tolerancing (GD&T)

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