Geometrical tolerances

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Geometrical tolerances

  1. 1. Geometrical Tolerances By Hassan Habib
  2. 2. Objectives • Introduction to Dimensions • Terminologies • Important Fundamental Rules • Basics about Dimensioning • Dimensioning Features • Introduction to Tolerances • Applications • Direct Tolerancing Methods • Tolerance Expressions • Tolerancing on various Features
  3. 3. Introduction to Dimensions • About The Standard ASME Y14.5 • The need of Dimensions • Historical Perspective
  4. 4. Introduction to Dimensions • Terminologies • Dimension (Basic, Reference) • Geometric Tolerance • Datum • Feature • Feature Control Frame • MMC & LMC
  5. 5. Introduction to Dimensions • Important Fundamental Rules • Each dimension should have a tolerance • It should fully define the geometry with no room left for assumptions or over definition • The dimensions define the finished part, any processing required should be specified • There should be only one interpretation of every dimension • Dimensions are valid only where they are specified
  6. 6. Introduction to Dimensions •Types of dimensioning •Millimeter dimensioning • Zero precedes when the dimension is less than 1 mm. • In case of whole number neither the decimal point nor the 0 is shown • Last digit of fractional dimension is not followed by a zero
  7. 7. Introduction to Dimensions •Types of dimensioning •Millimeter dimensioning
  8. 8. Introduction to Dimensions •Types of dimensioning •Inch dimensioning • Zero does not precede when the dimension is less than 1 in. • A dimension is expressed in the same number of zeroes as the tolerances
  9. 9. Introduction to Dimensions •Types of dimensioning •Inch dimensioning
  10. 10. Introduction to Dimensions • Basics of Dimensions • Dimension Lines • Alignment • Spacing
  11. 11. Introduction to Dimensions • Basics of Dimensions • Extension Lines • Crossing of extension lines
  12. 12. Introduction to Dimensions • Basics of Dimensions • Chain Lines • Leader Lines
  13. 13. Introduction to Dimensions • Basics of Dimensions • Reference Dimensions
  14. 14. Introduction to Dimensions • Dimensioning various features • Radii
  15. 15. Introduction to Dimensions • Dimensioning various features • Foreshortened Radii
  16. 16. Introduction to Dimensions • Dimensioning various features • Irregular Outlines
  17. 17. Introduction to Dimensions • Dimensioning various features • Counter bore Holes
  18. 18. Introduction to Dimensions • Dimensioning various features • Counter sunk Holes
  19. 19. Introduction to Dimensions • Dimensioning various features • Spotfaced Holes
  20. 20. Introduction to Dimensions • Dimensioning various features • Chamfers
  21. 21. Introduction to Dimensions • Dimensioning various features • Location
  22. 22. Introduction to Dimensions • Dimensioning various features • Location
  23. 23. Introduction to Dimensions • Dimensioning various features • Repetitive features
  24. 24. Introduction to Dimensions • Dimensioning various features • Repetitive features
  25. 25. Introduction to Dimensions • Dimensioning various features • Repetitive features
  26. 26. Introduction to Tolerances • Application of Tolerances • As direct limits • As a geometric tolerance • In a note or table referring to specific dimensions • In a general tolerance block referring to all dimensions on a drawing for which tolerances are not otherwise specified
  27. 27. Introduction to Tolerances •Direct Tolerancing Methods • Limit Dimensioning
  28. 28. Introduction to Tolerances •Direct Tolerancing Methods •Plus and Minus Tolerancing
  29. 29. Introduction to Tolerances •Tolerance Expression • Millimeter Tolerance • Inch Tolerance
  30. 30. Introduction to Tolerances •Tolerance Accumulation • Chain Dimensioning
  31. 31. Introduction to Tolerances •Tolerance Accumulation • Base Line Dimensioning
  32. 32. Introduction to Tolerances •Tolerance Accumulation • Direct Dimensioning
  33. 33. Introduction to Tolerances •Tolerance Accumulation •Dimensional Limits related to an origin
  34. 34. Introduction to Tolerances •Tolerance Accumulation •Dimensional Limits related to an origin
  35. 35. Introduction to Tolerances •Tolerancing on different features • Screw Threads • Gears and Splines
  36. 36. Introduction to Tolerances •Tolerancing on different features • Angular Surfaces
  37. 37. Introduction to Tolerances •Tolerancing on different features • Conical Tapers
  38. 38. Introduction to Tolerances •Tolerancing on different features • Radii
  39. 39. Introduction to Tolerances •Tolerancing on different features • Radii
  40. 40. Introduction to Tolerances •Tolerancing on different features • Statistical Tolerancing
  41. 41. Thank You for Your Patience

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