1. How to get first and third angle projections

2. OBSERVER MOVE AROUND Front view Right side view Top view

3. THE GLASS BOX CONCEPT Bottom view Left side view Rear view

4. Height Width Depth History

5. PROJECTION SYSTEMS 1. First angle system 2. Third angle system First Quadrant Third Quadrant - European country - ISO standard - Canada, USA, Japan, Thailand

6. ORTHOGRAPHIC PROJECTION 1 st angle system 3 rd angle system

7. ORTHOGRAPHIC VIEWS 1 st angle system 3 rd angle system Folding line Folding line Folding line Folding line  

8. ORTHOGRAPHIC VIEWS 1 st angle system 3 rd angle system Front View Right Side View Top View

9. First angle system Third angle system PROJECTION SYMBOLS

10. d 1.7d 2.2d Suggested proportion

11. WRITING STEPS 1. Select the necessary views 2. Layout the views. 3. Project the views. 4. Dimension the views.

12. 1. SELECT THE NECESSARY VIEWS

13. 45 152 64 2. LAYOUT THE VIEWS A4 25 Choose an appropriate scale 1:1

14. PROJECT THE VIEWS

15. DIMENSION THE VIEWS NOTES 1. Dimensions in millimeters. 2. …. PART NAME x x x x y y y y z

16. 16 Difference in first and third angel projection First-angle Projection Method  In first-angle projection, an object is placed in the first quadrant, i.e., above the HP and in front of the VP.  The object lies in between the observer and the plane of projection.  The plane of projection is assumed to be non transparent and views drawn on it.  Front view is above the reference axis and top view lies below the reference axis exactly bellow the front view.  Right hand side view is drawn to left of front view and Left hand side view is drawn to the right of front view.  Symbol Third -angle Projection Method In third-angle projection, an object is placed in the third quadrant, i.e., below the HP and behind the VP.  The plane of projection lies in between the observer and the object.  The plane of projection is assumed to be transparent and views drawn on it.  Front view is below the reference axis and top view lies above the reference axis exactly above the front view.  Right hand side view is drawn to right side of front view and Left hand side view is drawn to the left side of front view.  Symbol