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GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
•Purpose is to describe the engineering intent of parts
and assemblies
•Uses...
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
•Feature control frame
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)

Examples of Modifiers
•MMC – Maximum Material Condition
•LMC – Least Materi...
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
•ISO standard of preferred metric limits and fits: In
the dimension 16h11, t...
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GD&T
GD&T
GD&T
•Basic Dimension: Theoretically exact, untoleranced
dimensions that specify the perfect location, size,
shape, or ang...
GD&T
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
GEOMETRIC DIMENSIONING AND
TOLERANCING (GD&T)
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
GD&T – Datum Surfaces and Features
G d &_t
G d &_t
G d &_t
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G d &_t

  1. 1. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T) •Purpose is to describe the engineering intent of parts and assemblies •Uses symbols to specify geometric characteristics and dimensional requirements •Current GD&T standard: ANSI/ASME Y14.5M-2009 •Symbols for: •Form and profile tolerances, orientation tolerances, location tolerances, runout tolerances
  2. 2. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  3. 3. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T) •Feature control frame
  4. 4. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  5. 5. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T) Examples of Modifiers •MMC – Maximum Material Condition •LMC – Least Material Condition
  6. 6. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  7. 7. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  8. 8. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T) •ISO standard of preferred metric limits and fits: In the dimension 16h11, the tolerance zone is specified by a letter and a number, I.e. h11. An uppercase letter indicates that the tolerance applies to the hole; a lowercase letter indicates the tolerance applies to the shaft.
  9. 9. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  10. 10. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  11. 11. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  12. 12. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  13. 13. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  14. 14. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  15. 15. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  16. 16. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  17. 17. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  18. 18. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  19. 19. GD&T
  20. 20. GD&T
  21. 21. GD&T •Basic Dimension: Theoretically exact, untoleranced dimensions that specify the perfect location, size, shape, or angle of a feature. •Basic dimensions are identified by enclosing the dimension in a box. •Basic dimensions specify theoretically exact value from which variations are defined through feature control frames as well as toleranced features and notes. •General tolerances do not apply to basic dimensions.
  22. 22. GD&T
  23. 23. GD&T – Datum Surfaces and Features
  24. 24. GD&T – Datum Surfaces and Features
  25. 25. GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T)
  26. 26. GD&T – Datum Surfaces and Features
  27. 27. GD&T – Datum Surfaces and Features
  28. 28. GD&T – Datum Surfaces and Features
  29. 29. GD&T – Datum Surfaces and Features
  30. 30. GD&T – Datum Surfaces and Features
  31. 31. GD&T – Datum Surfaces and Features
  32. 32. GD&T – Datum Surfaces and Features
  33. 33. GD&T – Datum Surfaces and Features
  34. 34. GD&T – Datum Surfaces and Features
  35. 35. GD&T – Datum Surfaces and Features
  36. 36. GD&T – Datum Surfaces and Features
  37. 37. GD&T – Datum Surfaces and Features
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