Technical Drawing CHAPTER 1
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Transcript of Technical Drawing CHAPTER 1
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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 Projectionused mainly in USA
END VIEW
ISOMETRIC
FRONT VIEW
PLAN
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1st Angle Projection Symbol
FRONT VIEW SIDE VIEWFRONT VIEW
SIDE VIEW
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3rd Angle ProjectionUsed 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 1ST ANGLE AND 3RD ANGLE
1st Angle Projection 3rd Angle Projection
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MODULE OBJECTIVESBy the end of this module the student will be able to:
1.1 Describe orthographic projection1.2 State why engineers use orthographic projection1.3 Compare 1st degree angle and 3rd 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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