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Descriptive Geometry Eng. Areej Afeefy

# Descriptive Geometry Eng. Areej Afeefy

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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. Primary Auxiliary Views

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

14. Edge View of a plane

15. Chapter 3: LINES

16. Frontal Line

17. Frontal Line

18. 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.

19. Level (Horizontal) Line

20. Level Line

21. Profile Line

22. Profile Line

23. True Length of an Oblique Line

24. True Length of an Oblique Line

25. 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

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

27. 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

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

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

30. Grade

31. Chapter 4 Planes

32. Points and lines in Planes