1. Orthographic Projection 2 Dimensional View of an object
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

2. ME20/Tech20 – Engineering Design Graphics
Graphics Theory
Geometry and projection techniques.
Visualization
Ability to mentally process 3D information.
Drawing rules and industry practices.
Standards & Conventions
Computer-Aided-Design (CAD) software (2D & 3D)
.AutoCAD (2D) and Pro/E (3D)
Tools
Mechanical, Structural, Electrical, Architectural and
Art & Design, Industrial Design, …..
Applications
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

3. Mechanical and Aerospace Engineering Dept., SJSU
Different Viewpoint
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

4. Mechanical and Aerospace Engineering Dept., SJSU
Parallel Projection
Parallel
Perspective
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

5. Orthographic Projection
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

6. Mechanical and Aerospace Engineering Dept., SJSU
Standard 2D views
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

7. Standard Views of Primitive Solids
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

8. Mechanical and Aerospace Engineering Dept., SJSU
View Orientation
Good orientation
Poor orientation
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

9. Mechanical and Aerospace Engineering Dept., SJSU
View Selection
Select the most descriptive views
Use minimum number of views to describe the object
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

10. Conventional Practices Holes, Ribs & Webs – Principle of Revolution
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

11. Conventional Practices
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

12. Conventional Practices - Intersections
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

13. Miter Lines Miter lines are used to transfer depth information.
45o line drawn from point O O
Standard multiviews
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

14. Homework #1 – Due Friday 9/8 multiviews
Problems 6, 26, 47, and 57 – page (5th edition)
page (4th edition)
page 364 (3rd edition)
Freehand sketch the three standard views (front, top, and right side). Select the left side of
the 3D drawing as the front view. Sketch 2 problems per page. Drawings should be somewhat proportional.
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

15. Conventional Practices - Tangency
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

16. Fillets, Rounds & Chamfers
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

17. Mechanical and Aerospace Engineering Dept., SJSU
Top view
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

18. Mechanical and Aerospace Engineering Dept., SJSU
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

19. Edge Lines – Principal & Inclined
Principal lines appear vertical, horizontal or as point views. Inclined lines appear inclined in one view. 2
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

20. Edge Lines – Oblique Oblique line appears inclined in all views
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

21. Mechanical and Aerospace Engineering Dept., SJSU
Principal Planes
Principle planes are parallel to principal orthographic planes
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

22. Mechanical and Aerospace Engineering Dept., SJSU
Inclined Planes
Inclined planes are perpendicular to two opposite orthographic planes.
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

23. Mechanical and Aerospace Engineering Dept., SJSU
Oblique Planes
Oblique planes are neither parallel nor perpendicular to any principal orthographic planes.
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

24. Mechanical and Aerospace Engineering Dept., SJSU
Type of Planes
Oblique
Inclined
Principal
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

25. Mechanical and Aerospace Engineering Dept., SJSU
Edge View of a Plane
Principal planes appear in true size in one plane and as an edge view in the other two planes.
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU

26. Homework #2 – Due Friday 9/22/06 Pictorials
4th edition – page , 5th edition – page
freehand sketches, two drawings per page
1) Figure 7.61 – draw a perspective view, choose a vanishing point at the upper right hand corner
2) Problem 14 – draw an oblique view.
3) Problems 4, 22, and 27 – draw an isometric view, looking down, the left ,
side of the isometric should be the front view.
Ken Youssefi
Mechanical and Aerospace Engineering Dept., SJSU