Angle of projection

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Angle of Projections Today we will learn how to identify first angle and third angle projection

Identify the name of projection system ____________________ ____________________

Trying to remember ?

Don’t worry Today we will learn and never forget ever.

Third Angle Projection First Angle Projection Top view placed on top Botto m view placed on bottom Right view placed on Right Left view placed on Left Top view placed on bottom Botto m view placed on top Right view placed on left Left view placed on right Symbol Symbol

Tough to remember theory ?

Lets do some practical

T ake 3D object Vertical Arrangement Horizontal Arrangement

Try to imagine projection

What did you saw ?

A bigger base circle What did you saw ?

What did you saw ?

Two circle of base and top face What did you saw ?

Where you will place views ?

First Angle Projection

First Angle Projection : Vertical Arrangement

Seen from top but placed at bottom called : Top View First Angle Projection : Vertical Arrangement

First Angle Projection : Vertical Arrangement

Seen from bottom but placed at top called : Bottom View First Angle Projection : Vertical Arrangement

First Angle Projection : Horizontal Arrangement

First Angle Projection : Horizontal Arrangement Seen from left but placed at right called : Left View

First Angle Projection : Horizontal Arrangement

First Angle Projection : Horizontal Arrangement Seen from right placed at left called : Right View

Third Angle Projection

Third Angle Projection : Vertical Arrangement

Third Angle Projection : Vertical Arrangement Seen from top but placed at top called : Top View

Third Angle Projection : Vertical Arrangement

Third Angle Projection : Vertical Arrangement Seen from Bottom but placed at bottom called : Bottom View

Third Angle Projection : Horizontal Arrangement

Third Angle Projection : Horizontal Arrangement Seen from left placed at left called : left View

Third Angle Projection : Horizontal Arrangement

Third Angle Projection : Horizontal Arrangement Seen from right but placed at right called : Right View

Third Angle Projection First Angle Projection

Things to remember

Remember Whether you are observing vertical or horizontal arrangement and seeing from any side (top, bottom, left & right) Which side you going to see Which side you place ? ? ? ?

Whichever side you see If you place view at same side : Third angle projection If you place view at opposite side : First angle projection Remember

In first angle projection why top view placed at below front view ? Why

Follow the convention Rotate horizontal plane by 90° in clockwise direction for any first angle or third angle

Observe carefully for 1 st angle projection

FRONT VIEW TOP VIEW First Angle Projection view below front view Top view placed below front view

In third angle projection why top view placed at above front view ? Why

Observe carefully for 3 rd angle projection

FRONT VIEW TOP VIEW Top view placed above front view Third Angle Projection view above front view

Why we don’t use 2 nd and 4 th angle? Why

Observe carefully for 2 nd angle projection

Imagine projections and rotate horizontal plane clockwise. Observe carefully for 2 nd angle projection

You will get both of views overlapped Observe carefully for 2 nd angle projection

Observe carefully for 4 th angle projection

Imagine projections and rotate horizontal plane clockwise. Observe carefully for 4 th angle projection

Observe carefully for 4 th angle projection You will get both of views overlapped

Why we don’t use 2 nd and 4 th angle? Because two view overlapped if we follow convention for rotating horizontal plane

Question for you

Identify the name of projection system ____________________ ____________________

Identify the name of projection system ____________________ ____________________ First Angle projection Third Angle projection ?

Identify the name of projection system ____________________ ____________________ First Angle projection Third Angle projection X

Identify the name of projection system ____________________ ____________________ Try again

Identify the name of projection system ____________________ ____________________ Third Angle projection First Angle projection ?

Identify the name of projection system ____________________ ____________________ Third Angle projection First Angle projection Correct

Identify the name of projection system

Identify the name of projection system ____________________ ____________________ ?

Identify the name of projection system ____________________ ____________________ X Third Angle projection First Angle projection

Identify the name of projection system ____________________ ____________________ Try again

Identify the name of projection system ____________________ ____________________ ?

Identify the name of projection system ____________________ ____________________ ? Try again

Identify the name of projection system ____________________ ____________________ First Angle projection Third Angle projection ?

Identify the name of projection system ____________________ ____________________ First Angle projection Third Angle projection Correct

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Angle of projection

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