1. ES 101 Engineering Graphics
Gaurav Srivastava
Assistant Professor
Civil Engineering
Fall 2017

2. Last time
Projection
Orthographic projection

3. Six principal views on glass box

5. Multi-view Projection

6. Comparison of Various Projections
Advantage
Disadvantage
Isometric view drawings
Easy to understand
3D representation of objects
Shape and angle distortion
Multi-view drawings
Accurate representation of shape and size
Requires practice in drawing and reading
Perspective view drawings
Realistic representation of human vision
Shape, size and angle distortion
ES101: Lecture 4 (4 September 2014)

7. Angle of Projection – Conventions
1st angle of projection
Object in front of plane
3rd angle of projection
Object behind plane
Right Profile Plane
Frontal Plane
Second Quadrant
First Quadrant
Horizontal Plane
Third Quadrant
Fourth Quadrant

9. First Angle of Projection

10. Third Angle of Projection

11. First Angle of Projection

12. Third Angle of Projection

13. Third Angle of Projection

14. Projection Symbol 1st angle projection 3rd angle projection Front View
Left View
Front View
1st angle projection
3rd angle projection
Left View
Front View

15. Example: Angles of Projection
First Angle of Projection
Third Angle of Projection

16. Necessary Views

17. Necessary Views

18. Two View Drawings

19. Two View Drawings

20. Two View Drawings Choosing between two views
prefer the one with fewer number of hidden lines

21. Two View Drawings Choosing between two views
prefer the one that fits better on the drawing sheet

22. Two View Drawings

23. One View Drawings
A single view supplemented by a note or lettered symbols for relatively simple object
0.25 mm thick

24. One View Drawings
Shafts, bolts, screws, and similar parts are generally represented by single views

25. Alignment of Views

26. Practice problem
Sketch 3rd angle orthographic projection 5 15 6

27. Practice problem
Sketch 3rd angle orthographic projection