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# Technical Drawing CHAPTER 1 - PowerPoint PPT Presentation

Technical Drawing CHAPTER 1. By : Aznita Abdullah. Why engineers use orthographic projection?. Engineers need to be able to explain and simplify complicated design ideas for others to understand. Why engineers use orthographic projection ?.

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### Technical DrawingCHAPTER 1

By:

Aznita Abdullah

Engineers need to be able to explain and simplify complicated design ideas for others to understand.

To show complicated 3 dimensional (3D) object in two dimension (2D)

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

• Plan

• Front View

• Side View (or End View)

Viewed in 2 ways:

• 1st Angle Projection

• 3rd Angle Projection.

1st Angle Projectionused mainly in USA

FRONT VIEW

END VIEW

ISOMETRIC

PLAN

1st Angle Projection Symbol

FRONT VIEW

SIDE VIEW

SIDE VIEW

FRONT VIEW

3rd Angle Projection

Used in UK and in most countries of the world

ISOMETRIC

PLAN

FRONT VIEW

END VIEW

3rd angle Projection Symbol

SIDE VIEW

FRONT VIEW

FRONT VIEW

SIDE VIEW

DIFFERENCE BETWEEN 1ST ANGLE AND 3RD ANGLE

1st Angle Projection 

3rd Angle Projection 

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

By the end of this module the student will be able to:

Correctly sketch two-dimensional views from three dimensional drawings.

END VIEW

FRONT VIEW

By the end of this module the student will be able to:

Correctly identify and draw different types of line.