Orthographic English

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Shor lecture in orthographic projection

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Orthographic English

  1. 1. REVIEWS
  2. 2. Engineering Drawing Skills <ul><li>Lettering..good writing </li></ul><ul><li>Line Types..clear between thick and thin lines </li></ul><ul><li>Orthographic Views </li></ul><ul><li>Patience </li></ul>See the example drawings in the notes.
  3. 3. Line Types <ul><li>Visible Line (thick) </li></ul><ul><li>Hidden Line (thick) </li></ul><ul><li>Center Line (thin) </li></ul><ul><li>Dimension Line (thin) </li></ul><ul><li>Construction Line (thin) </li></ul>
  4. 4. Line Types
  5. 5. Sketching Techniques
  6. 6. Todays lecture is about... ISOMETRIC VIEW ORTHOGRAPHIC VIEW
  7. 7. Orthographic Projection
  8. 8. THIRD WEEK <ul><li>ORTHOGRAPHIC </li></ul><ul><ul><li>Introduction to orthographic view. </li></ul></ul><ul><ul><li>First angle projection view. </li></ul></ul><ul><ul><li>Third angle projection view. </li></ul></ul><ul><ul><li>Projection view symbols. </li></ul></ul><ul><ul><li>Selection of direction views. </li></ul></ul><ul><ul><li>Dimensioning for orthographic . </li></ul></ul>
  9. 9. Describing an Angle Bracket
  10. 10. Orthographic Projection <ul><li>Orthographic drawings represent three dimensional objects in three separate views arranged in a standard manner. </li></ul>
  11. 11. Orthographic Views <ul><li>You can adequately describe most objects with three orthographic views. </li></ul><ul><ul><li>Front </li></ul></ul><ul><ul><li>Top </li></ul></ul><ul><ul><li>Right </li></ul></ul>
  12. 12. Converting to Orthographic
  13. 14. Orthographic Views Hidden lines Centre line
  14. 15. The Glass Box Approach
  15. 16. Opening the Box
  16. 17. Final Views
  17. 18. Construction of Views CONSTRUCTION LINES
  18. 19. Object for exercise
  19. 20. Solution
  20. 21. Solution
  21. 22. Solution
  22. 23. First Angle Projection <ul><li>Introduce in Europe as the earlier method of engineering drawing. </li></ul><ul><li>The object is as though in the first quarter ( 0 0 ~ 90 0 ) </li></ul>
  23. 24. First Angle Projection <ul><li>Symbol used in Engineering Drawing </li></ul>
  24. 25. First Angle Projection <ul><li>Based on 3 basic views :- </li></ul><ul><li>Plan view (seen from the top of the object) </li></ul><ul><li>Front view (seen from the front of the object) </li></ul><ul><li>Side view (seen from the side of the object) </li></ul><ul><li>The shadows of the object are cast </li></ul><ul><li>onto the plane behind the object </li></ul>
  25. 26. First Angle Projection <ul><li>The shadows of the object are cast onto the plane behind the object </li></ul>SIDE VIEW FRONT VIEW PLAN VIEW
  26. 27. Third Angle Projection <ul><li>Introduce in USA, this standard is being widely used till today </li></ul><ul><li>The object is as though in the first quarter ( 180 0 ~ 270 0 ) </li></ul>
  27. 28. Third Angle Projection <ul><li>The standard symbol </li></ul>
  28. 30. Orthographic Views
  29. 31. Third Angle Projection <ul><li>Based on 3 basic views :- </li></ul><ul><li>The plan view (as seen from the top of the object) </li></ul><ul><li>The front view (as seen from the front of the object) </li></ul><ul><li>The side view (as seen from the side of the object) </li></ul><ul><li>The shadows of the object are </li></ul><ul><li>shown onto the plane in front </li></ul><ul><li>of the object </li></ul>PLAN SIDE VIEW FONT VIEW
  30. 32. Third Angle Projection <ul><li>The shadows of the object are shown onto the plane in front of the object </li></ul>PLAN SIDE VIEW FRONT VIEW
  31. 34. Theory of Dimensioning -Techniques and Conventions <ul><li>Object is made of several parts </li></ul><ul><li>Position (P) </li></ul><ul><li>Size (S) </li></ul><ul><li>Each feature is dimensioned once </li></ul><ul><li>For each feature, dimension positioned where its shape shows </li></ul><ul><li>No Redundancy </li></ul>

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