1. ENGN103 Engineering Drawing
Lecture 5

2. What is Orthographic Projection?
Orthographic Projection is a method of representing a three dimensional object on paper using several two dimensional views.
It is the international language of Engineers and Designers

4. Orthographic Projection?
Front elevation
Side elevation
Plan – Top view
Isometric view

5. Side elevation
Front elevation
Plan – Top view

6. Height Height Depth Width Width Height Depth Depth Width
FRONT ELEVATION
SIDE ELEVATION
Height
Width
Depth
Depth
Width
PLAN

7. FRONT ELEVATION
SIDE ELEVATION

9. FRONT ELEVATION
SIDE ELEVATION
PLAN

12. Precedence of Lines

13. Transferring Depth Dimensions
The depth dimensions in the top and side views must correspond
You may find it convenient to use dividers, a scale, or a 45-degree miter line to project dimensions

14. 45-degree miter line to project dimensions

15. FRONT ELEVATION
SIDE ELEVATION
PLAN

16. FRONT ELEVATION
SIDE ELEVATION
PLAN

17. FRONT ELEVATION
SIDE ELEVATION
PLAN

18. Centerlines

19. Precedence of Lines
FRONT ELEVATION
SIDE ELEVATION
PLAN

20. FRONT ELEVATION
SIDE ELEVATION
PLAN