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Geometric Dimensioning and Tolerancing

Geometric Dimensioning and Tolerancing. Chapter 2, Symbols and Abbreviations. Introduction. GDT is a language of symbols We will see an overview of the symbols associated with: Dimensioning Symbols Geometric Characteristics Modifying Symbols. Dimensioning Symbols. Dimensioning Symbols.

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Geometric Dimensioning and Tolerancing

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

  2. Introduction • GDT is a language of symbols • We will see an overview of the symbols associated with: • Dimensioning Symbols • Geometric Characteristics • Modifying Symbols

  3. Dimensioning Symbols

  4. Dimensioning Symbols Diameter  Radius R

  5. Dimensioning Symbols Spherical Diameter S Spherical Radius SR

  6. Dimensioning Symbols Controlled Radius Tolerance CR Number of Places  A controlled radius has no ‘reversals’, but is a smooth curve within the tolerance zone.

  7. Dimensioning Symbols Counterbore/Spotface Countersink

  8. Dimensioning Symbols Depth/Deep Dimensions Not to Scale

  9. Dimensioning Symbols Conical taper Slope

  10. Dimensioning Symbols Square Reference Dimension

  11. Dimensioning Symbols Dimension Origin Arc Length

  12. Dimensioning Symbols All Around All Over

  13. Dimensioning Symbols Chain Line Used to identify a limited region to be treated differently from the rest of the part.

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

  15. Geometric Characteristics Explained in detail in Chapters 6 and 8.

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

  17. Modifying Symbols

  18. Modifying Symbols Maximum Material Condition MMC MMC Refers to the size of the feature associated with the most material.

  19. Modifying Symbols Least Material Condition LMC LMC Refers to the size of the feature associated with the least material.

  20. Modifying Symbols Continuous Feature Basic Dimension Used to describe a theoretically exact size.

  21. Modifying Symbols Between

  22. Evaluation

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