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# Engineering Drawing - Geometric Construction, Orthographic and Isometric Projection

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This presentation is used as my teaching material in Universitas Marsekal Suryadarma, Indonesia in 2013. There are some following chapters contain more of basic engineering drawing theory. Content of this presentations are refer to the reference page, and if anyone find that some contain in my presentation require premission from the relevant, please do not hesitate to contact me. Thanks and enjoy!!

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• Carry Prameswari, Thank you so much.... I'm teaching Engineering Drawing, and I find your presentation very useful.... Good work and More power... Emong (Philippines)

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### Engineering Drawing - Geometric Construction, Orthographic and Isometric Projection

1. 1. 121 1208 Engineering Drawing I Carry Prameswari Program Studi Teknik Penerbangan Fakultas Teknologi Kedirgantaraan Universitas Dirgantara Marsekal Suryadarma
2. 2. Topics • Geometric Construction • Orthographic Projection • Isometric Projection
3. 3. Geometric Construction
4. 4. Geometric Construction • Construction of primitive geometric forms (points, lines and planes etc.) that serve as the building blocks for more complicated geometric shapes.
5. 5. Geometric Construction a. Point : - Non dimensional geometrical element. - Occurred by interception of various lines.
6. 6. Geometric Construction b. Line : One dimension geometrical element occurred by moving of a point in various direction.
7. 7. Geometric Construction c. Plane: - Occurred by at least three points or connection of one point and one line. - A plane is always 2D - When the number of element forming a plane increases, shape and name will change.
8. 8. Geometric Construction
9. 9. Relationship of One Line to Another Line or Arc
10. 10. Bisecting a Line
11. 11. Dividing a Line into Equal Parts
12. 12. Orthographic Projection
13. 13. Orthographic Projection • Reference: Technical Graphics • Advantage— Represent features of an object more accurately • Example problem
14. 14. Orthographic Projection • Orthographic projections are a collection of 2D drawings that work together to give an accurate overall representation of an object.
15. 15. Orthographic Projection
16. 16. Projection Drawing • Isometric projection is a method for visually representing three-dimensional objects in two dimensions in technical and engineering drawing.
17. 17. Multi-view Projection—The Glass Box • Placing parallel planes to the principal planes forms a glass box (always observed from outside the box) • To show views of a 3D object on 2D piece of paper, it is necessary to unfold the planes such that they lie in the same plane • All planes except the rear plane are hinged to the frontal plane, which is hinge to the left-side plane.
18. 18. Multi-view Projection—The Glass Box • By unfolding the box, six views of the object are possible
19. 19. Multi-view Projection—The Glass Box
20. 20. Multi-view Projection—The Glass Box
21. 21. Multi-view Projection—The Glass Box
22. 22. Multi-view Projection—The Glass Box
23. 23. Multi-view Projection—The Glass Box
24. 24. Multi-view Projection—The Glass Box
25. 25. Which Views to Present?
26. 26. Which Views to Present? • General guidelines – Pick a Front View that contain the most information that describe the object – Normally the longest dimension is chosen as the width (or depth) – Most common combination of views are: • Front, top and side view – Any other view that is different from the principal views is called an Auxiliary View
27. 27. Minimum Drawing View • 3 view • 2 view
28. 28. Projection Angle
29. 29. Projection Angle Projection Symbol First Angle European Third Angle American
30. 30. Projection Angle
31. 31. Exercises
32. 32. Exercises
33. 33. Exercises
34. 34. Exercises
35. 35. Exercises
36. 36. Exercises
37. 37. QUESTION ???
38. 38. Thank You