intro to ortho projection
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Orthographic projections
Dr Ashish K Darpe
Department of Mechanical EngineeringIIT Delhi
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X
Y
HP IS ROTATED DOWNWARD 900
AND
BROUGHT IN THE PLANE OF FP.
PP IS ROTATED IN RIGHT SIDE 90
0
AND
BROUGHT IN THE PLANE OF FP.
X
Y
X Y
FP
HP
PP
FV
ACTUAL PATTERN OF PLANES & VIEWS
OF ORTHOGRAPHIC PROJECTIONS
DRAWN IN
FIRST ANGLE METHOD OF PROJECTIONS
LSV
TV
A) HP IS ROTATED 900DOUNWARD
B) PP, 900IN RIGHT SIDE DIRECTION.
THIS WAY BOTH PLANES ARE BROUGHT IN THE SAME PLANE CONTAINING FP.
PATTERN OF PLANES & VIEWS (First Angle Method)
Horizontal Plane (Top Plane)
Frontal Plane (Vertical Plane)
FP
HP
PP
ORTHOGRAPHIC PROJECTIO
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FOR T.V.
P.P. F.P.
V
S.V.
O B E
! T
IN THIS METHOD,THE OBJECT IS ASSUMED TO BE
SITUATED IN THIRD QUADRANT( BELOW HP & BEHIND OF FP. )
LANES BEING TRANSPERENTAND INBETWEEN
OBSERVER & OBJECT.
ACTUAL PATTERN OFPLANES & VIEWS
OFTHIRD ANGLE PROJECTIONS
X Y
TV
T"IR# AN$LE
PROE!TION
LSV FV
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