1. 121 1208 Engineering Drawing I Carry Prameswari Program Studi Teknik Penerbangan Fakultas Teknologi Kedirgantaraan Universitas Dirgantara Marsekal Suryadarma

2. Topics Geometric Construction Orthographic Projection Isometric Projection

3. Geometric Construction

4. Construction of primitive geometric forms (points, lines and planes etc.) that serve as the building blocks for more complicated geometric shapes.

5. Geometric Construction a.Point : -Non dimensional geometrical element. -Occurred by interception of various lines.

6. Geometric Construction b. Line : One dimension geometrical element occurred by moving of a point in various direction.

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. Geometric Construction

9. Relationship of One Line to Another Line or Arc

10. Bisecting a Line

11. Dividing a Line into Equal Parts

12. Orthographic Projection

13. Reference: Technical Graphics Advantage— Represent features of an object more accurately Example problem

14. Orthographic Projection Orthographic projections are a collection of 2D drawings that work together to give an accurate overall representation of an object.

15. Orthographic Projection

16. Projection Drawing Isometric projection is a method for visually representing three-dimensional objects in two dimensions in technical and engineering drawing.

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. Multi-view Projection—The Glass Box By unfolding the box, six views of the object are possible

19. Multi-view Projection—The Glass Box

25. Which Views to Present?

26. 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. Minimum Drawing View 3 view 2 view

28. Projection Angle

29. ProjectionSymbol First AngleEuropean Third AngleAmerican

30. Projection Angle

31. Exercises

37. QUESTION ???

38. Thank You