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Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations
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Page 1: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

Geometric Dimensioning and Tolerancing

Chapter 2, Symbols and Abbreviations

Page 2: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

EML 2023Department of Mechanical and Aerospace Engineering 2

Introduction

• GDT is a language of symbols

• We will see an overview of the symbols associated with:– Dimensioning Symbols– Geometric Characteristics– Modifying Symbols

Page 3: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

EML 2023Department of Mechanical and Aerospace Engineering 3

Dimensioning Symbols

Page 4: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Dimensioning Symbols

Diameter Radius R

Page 5: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Dimensioning Symbols

Spherical Diameter S Spherical Radius SR

Page 6: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Dimensioning Symbols

Controlled Radius Tolerance CR Number of Places

A controlled radius has no ‘reversals’, but is a smooth curve within the tolerance zone.

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Dimensioning Symbols

Counterbore/Spotface Countersink

Page 8: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Dimensioning Symbols

Depth/Deep Dimensions Not to Scale

Page 9: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Dimensioning Symbols

Conical taper Slope

Page 10: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Dimensioning Symbols

Square Reference Dimension

Page 11: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Dimensioning Symbols

Dimension Origin Arc Length

Page 12: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Dimensioning Symbols

All Around All Over

Page 13: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Dimensioning Symbols

Chain Line

Used to identify a limited region to be treated differently from the rest of the part.

Page 14: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Geometric Characteristics

Explained in detail in Chapters 6 and 8.

Page 15: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Modifying Symbols

Page 16: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Modifying Symbols

Maximum Material ConditionMMC

MMC

Refers to the size of the feature associated with the most material.

Page 17: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

EML 2023Department of Mechanical and Aerospace Engineering 17

Modifying Symbols

Least Material ConditionLMC

LMC

Refers to the size of the feature associated with the least material.

Page 18: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

EML 2023Department of Mechanical and Aerospace Engineering 18

Modifying Symbols

Continuous Feature Basic Dimension

Used to describe a theoretically exact size.

Page 19: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

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Modifying Symbols

Between

Page 20: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.

Evaluation

Page 21: Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.