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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 drawing chapter 1

Technical DrawingCHAPTER 1

By:

Aznita Abdullah


Why engineers use orthographic projection
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 projection1
Why engineers use orthographic projection?

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


Orthographic projection
ORTHOGRAPHIC PROJECTION

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


Orthographic projection 3 views
ORTHOGRAPHIC PROJECTION – 3 VIEWS

  • Plan

  • Front View

  • Side View (or End View)


Orthographic projection1
ORTHOGRAPHIC PROJECTION

Viewed in 2 ways:

  • 1st Angle Projection

  • 3rd Angle Projection.


1st angle projection used mainly in usa
1st Angle Projectionused mainly in USA

FRONT VIEW

END VIEW

ISOMETRIC

PLAN


1st angle projection symbol
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 1 st angle and 3 rd angle
DIFFERENCE BETWEEN 1ST ANGLE AND 3RD ANGLE

1st Angle Projection 

3rd Angle Projection 


Module objectives
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


Module objectives 1 4
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.


PLAN VIEW

END VIEW

FRONT VIEW


Module objectives 1 5
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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