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Descriptive Geometry Eng. Areej Afeefy

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  1. Descriptive GeometryEng. AreejAfeefy Ref. Descriptive Geometry Metric PARE/LOVING/HILL Fifth edition

  2. Descriptive Geometry • Descriptive Geometry: is the science of graphic representation and solution and space problems By Arch. Areej Afeefy

  3. projections • Two common types of projections: 1) perspective projections (used by architects or artists) 2) orthographic projections (perpendicular to the object)

  4. Perspective Projection Screen Human eye

  5. Orthographic Projection Screen

  6. Orthographic Projection Horizontal Front Profil

  7. Horizontal Profil Front

  8. Principal Views

  9. Draw the profile

  10. Steps to obtain a view • Establish the line of sight. • Introduce the folding line • Transfer distances to the new view • Determine visibility and complete the view

  11. Step 1: Establish the line of sight. Primary Auxiliary Views Step 2: Introduce the folding line Step 3: transfer distances a,e d,h y b,f c,g H 1 Step 4: determine visibility and complete view D2 1 D1 D y h d g k1 e D2 c y f a D1 f,e g,h b b,a c,d

  12. All views projected from top view has the same height dimension

  13. Primary Auxiliary Views

  14. View 1 is an auxiliary view projected from the front View

  15. All the views projected from front view have the same depth dimension

  16. Edge View of a plane

  17. Chapter 3: LINES

  18. Frontal Line

  19. Frontal Line

  20. the true angel between a line and any projection plane appears in any view shows the line in true length and the projection plane in Edge View.

  21. Level (Horizontal) Line

  22. Level Line

  23. Profile Line

  24. Profile Line

  25. True Length of an Oblique Line

  26. True Length of an Oblique Line

  27. Bearing , Slope, and Grade N N aH aH S55oE 55 b b Bearing: a term used to describe the direction of a line on the earth’s surface

  28. Azimuth Bearing N aH aH 125o N125o b b

  29. problem • A 160-m segment AB of a power line has a bearing of N 60o and a downward slope of 20o from the given point A. Complete the front and top views. ah aF

  30. D1 D1 D1 D1 b 1 20o H 160 m N b N 60o a1 ah H F aF b

  31. Grade Grade: another way to describe the inclination of a line from the horizontal Plane

  32. Grade

  33. Chapter 4 Planes

  34. Points and lines in Planes