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University of Palestine College of Engineering & Urban Planning First Level

University of Palestine College of Engineering & Urban Planning First Level. Engineering Drawing Lecture 9 Orthographic Writing. Lecturer: Eng. Eman Al.Swaity Eng.Heba hamad. Views selection. Basic dimensioning. Exercises. TOPICS. View Selection. VIEW SELECTION STEPS.

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University of Palestine College of Engineering & Urban Planning First Level

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  1. University of Palestine College of Engineering & Urban Planning First Level Engineering Drawing Lecture 9 Orthographic Writing Lecturer: Eng. Eman Al.Swaity Eng.Heba hamad

  2. Views selection Basic dimensioning Exercises TOPICS

  3. View Selection

  4. VIEW SELECTION STEPS 1. Orient the object to the best positionrelative to a glass box. 2. Select the front view. 3. Select adjacent views.

  5. The object should be placed in its natural position. The object should presents its features in actualsize and shape in orthographic views. STEP 1 : Orient the Object GOOD NO !

  6. The object’s longest dimension should be presented as a width. STEP 2 : Select a Front View First choice Second choice Waste more space GOOD Inappropriate

  7. The adjacent views that are projected from the selected front view should appear in its natural position. STEP 2 : Select a Front View Inappropriate

  8. Choose the view that have the fewest number ofhidden lines. STEP 2 : Select a Front View GOOD Inappropriate

  9. Choose the view that have the fewest number ofhidden lines. STEP 3 : Select an Adjacent View GOOD Inappropriate GOOD Inappropriate

  10. Choose the minimum number of views that can represent the major features of the object. STEP 3 : Select an Adjacent View Difficult to interprete. Necessary Necessary Hole’s location can be specified on the same view. Easy to understand

  11. Choose the views that are suitable to a drawingspace. STEP 3 : Select an Adjacent View POOR Not enough space for dimensioning.

  12. Choose the views that are suitable to a drawingspace. STEP 3 : Select an Adjacent View GOOD

  13. D W H D W H Example: View selection F.V. mislead to… Three views F.V. & T.V. F.V. & R.S.V.    Size description    Shape description

  14. Flat part having a uniform thickness. ONE-VIEW DRAWING 1 Thick These 2 views provide only informationabout the part thickness ! Unnecessary

  15. Cylindrical-shaped part. ONE-VIEW DRAWING Unnecessary Repeat ! Infer from CL Unnecessary

  16. There exists an identical view. TWO-VIEW DRAWING Repeat ! Unnecessary

  17. The 3rd view has no significant contours of the object. TWO-VIEW DRAWING Unnecessary

  18. The 3rd view has no significant contours of the object. TWO-VIEW DRAWING Unnecessary

  19. Basic Dimensioning

  20. COMPONENTS 1. Extension lines 27 10 10 Drill, 2 Holes R16 2. Dimension lines 3. Leader lines 4. Dimension numbers 17 5. Local notes 43

  21. Exercises

  22. Front View EXAMPLE A

  23. EXAMPLE B Front View

  24. EXAMPLE C Front View

  25. Front View EXAMPLE D

  26. End of The Lecture Orthographic Writing

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