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Technical Drawing CHAPTER 1 By : Aznita Abdullah.

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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 1.Plan 2.Front View 3.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 ISOMETRIC FRONT VIEW PLAN

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

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

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

11 DIFFERENCE BETWEEN 1 ST ANGLE AND 3 RD ANGLE 1 st Angle Projection   3 rd 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 1 st degree angle and 3 rd 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 END VIEW PLAN VIEW FRONT VIEW

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

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