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Orthographic projections. Dr Ashish K Darpe Department of Mechanical Engineering IIT Delhi. ORTHOGRAPHIC PROJECTION. A) HP IS ROTATED 90 0 DOUNWARD B ) PP, 90 0 IN RIGHT SIDE DIRECTION. THIS WAY BOTH PLANES ARE BROUGHT IN THE SAME PLANE CONTAINING FP. PP. FP. Y. X. HP.

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Orthographic projections

Orthographic projections

Dr Ashish K Darpe

Department of Mechanical Engineering

IIT Delhi


ORTHOGRAPHIC PROJECTION

A) HP IS ROTATED 900 DOUNWARD

B) PP, 900 IN RIGHT SIDE DIRECTION.

THIS WAY BOTH PLANES ARE BROUGHT IN THE SAME PLANE CONTAINING FP.

PP

FP

Y

X

HP

ACTUAL PATTERN OF PLANES & VIEWS

OF ORTHOGRAPHIC PROJECTIONS

DRAWN IN

FIRST ANGLE METHOD OF PROJECTIONS

Frontal Plane (Vertical Plane)

PP

PATTERN OF PLANES & VIEWS (First Angle Method)

FP

Y

X

Horizontal Plane (Top Plane)

HP

FV

LSV

X

Y

TV

PP IS ROTATED IN RIGHT SIDE 900

AND

BROUGHT IN THE PLANE OF FP.

HP IS ROTATED DOWNWARD 900

AND

BROUGHT IN THE PLANE OF FP.


FOR T.V.

FOR S.V.

FOR F.V.

THIRD ANGLE

PROJECTION

IN THIS METHOD,

THE OBJECT IS ASSUMED TO BE

SITUATED IN THIRD QUADRANT

( BELOW HP & BEHIND OF FP. )

PLANES BEING TRANSPERENT

AND INBETWEEN

OBSERVER & OBJECT.

P.P.

F.P.

OBJECT

TV

X

Y

S.V.

F.V.

FV

LSV

ACTUAL PATTERN OF

PLANES & VIEWS

OF

THIRD ANGLE PROJECTIONS


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