1. Technical Drawing CHAPTER 1
By:
Aznita Abdullah

2. Why engineers use orthographic projection?
Engineers need to be able to explain and simplify complicated design ideas for others to understand.

3. Why engineers use orthographic projection?
To show complicated 3 dimensional (3D) object in two dimension (2D)

4. ORTHOGRAPHIC PROJECTION
the object is looked at from three views at 90 degrees to each other.

5. ORTHOGRAPHIC PROJECTION – 3 VIEWS
Plan
Front View
Side View (or End View)

6. ORTHOGRAPHIC PROJECTION
Viewed in 2 ways:
1st Angle Projection
3rd Angle Projection.

7. 1st Angle Projection used mainly in USA
END VIEW
FRONT VIEW
ISOMETRIC
PLAN

8. 1st Angle Projection Symbol
FRONT VIEW
SIDE VIEW
SIDE VIEW
FRONT VIEW

9. Used in UK and in most countries of the world
3rd Angle Projection
Used in UK and in most countries of the world
PLAN
ISOMETRIC
FRONT VIEW
END VIEW

10. 3rd angle Projection Symbol
FRONT VIEW
SIDE VIEW
FRONT VIEW
SIDE VIEW

11. DIFFERENCE BETWEEN 1ST ANGLE AND 3RD ANGLE
1st Angle Projection  3rd Angle Projection 

12. MODULE OBJECTIVES
By the end of this module the student will be able to:
1.1 Describe orthographic projection
1.2 State why engineers use orthographic projection
1.3 Compare 1st degree angle and 3rd degree angle

13. MODULE OBJECTIVES 1.4
By the end of this module the student will be able to:
Correctly sketch two-dimensional views from three dimensional drawings.

14. PLAN VIEW
END VIEW
FRONT VIEW

16. Correctly identify and draw different types of line.
MODULE OBJECTIVES 1.5
By the end of this module the student will be able to:
Correctly identify and draw different types of line.