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Technical Drawing CHAPTER 1 By : Aznita Abdullah

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

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

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

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ORTHOGRAPHIC PROJECTION – 3 VIEWS 1.Plan 2.Front View 3.Side View (or End View)

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

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

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

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

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

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

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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

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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.

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END VIEW PLAN VIEW FRONT VIEW

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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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