1. ORTHOGRAPHIC PROJECTIONS :
IT IS A TECHNICAL DRAWING IN WHICH DIFFERENT VIEWS OF AN OBJECT
ARE PROJECTED ON DIFFERENT REFERENCE PLANES
OBSERVING PERPENDICULAR TO RESPECTIVE REFERENCE PLANE
Different Reference planes are
Horizontal Plane (HP),
Vertical Frontal Plane ( VP )
Side Or Profile Plane ( PP)
And
Different Views are Front View (FV), Top View (TV) and Side View (SV)
FV is a view projected on VP.
TV is a view projected on HP.
SV is a view projected on PP.
IMPORTANT TERMS OF ORTHOGRAPHIC PROJECTIONS:
1 Planes.
2 Pattern of planes & Pattern of views
3 Methods of drawing Orthographic Projections

2. PATTERN OF PLANES & VIEWS (First Angle Method)
2
THIS IS A PICTORIAL SET-UP OF ALL THREE PLANES.
ARROW DIRECTION IS A NORMAL WAY OF OBSERVING THE OBJECT.
BUT IN THIS DIRECTION ONLY VP AND A VIEW ON IT (FV) CAN BE SEEN.
THE OTHER PLANES AND VIEWS ON THOSE CAN NOT BE SEEN.
Y PROCEDURE TO SOLVE ABOVE PROBLEM:-
TO MAKE THOSE PLANES ALSO VISIBLE FROM THE ARROW DIRECTION,
A) HP IS ROTATED 900 DOUNWARD
X B) PP, 900 IN RIGHT SIDE DIRECTION.
THIS WAY BOTH PLANES ARE BROUGHT IN THE SAME PLANE CONTAINING VP.
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VP PP
Y
FV LSV
X Y
X TV
HP
ACTUAL PATTERN OF PLANES & VIEWS
HP IS ROTATED DOWNWARD 900 PP IS ROTATED IN RIGHT SIDE 90 0 OF ORTHOGRAPHIC PROJECTIONS
AND AND DRAWN IN
BROUGHT IN THE PLANE OF VP. BROUGHT IN THE PLANE OF VP. FIRST ANGLE METHOD OF PROJECTIONS

3. ORTHOGRAPHIC PROJECTIONS
OF POINTS, LINES, PLANES, AND SOLIDS.
TO DRAW PROJECTIONS OF ANY OBJECT,
ONE MUST HAVE FOLLOWING INFORMATION
A) OBJECT
{ WITH IT’S DESCRIPTION, WELL DEFINED.}
B) OBSERVER
{ ALWAYS OBSERVING PERPENDICULAR TO RESP. REF.PLANE}.
C) LOCATION OF OBJECT,
{ MEANS IT’S POSITION WITH REFFERENCE TO H.P. & V.P.}
TERMS ‘ABOVE’ & ‘BELOW’ WITH RESPECTIVE TO H.P.
AND TERMS ‘INFRONT’ & ‘BEHIND’ WITH RESPECTIVE TO V.P
FORM 4 QUADRANTS.
OBJECTS CAN BE PLACED IN ANY ONE OF THESE 4 QUADRANTS.
IT IS INTERESTING TO LEARN THE EFFECT ON THE POSITIONS OF VIEWS ( FV, TV )
OF THE OBJECT WITH RESP. TO X-Y LINE, WHEN PLACED IN DIFFERENT QUADRANTS.
STUDY ILLUSTRATIONS GIVEN ON HEXT PAGES AND NOTE THE RESULTS.TO MAKE IT EASY
HERE A POINT A IS TAKEN AS AN OBJECT. BECAUSE IT’S ALL VIEWS ARE JUST POINTS.

4. STUDY
Z
ILLUSTRATIONS
F.V. & T.V. and S.V.of an object are given. Draw it’s isometric view.
ORTHOGRAPHIC PROJECTIONS
FRONT VIEW L.H.SIDE VIEW
20
20
20
x y
O 50
20
30
O
20 20 20
TOP VIEW

5. STUDY
Z
ILLUSTRATIONS
F.V. and S.V.of an object are given.
Draw it’s isometric view.
30 SQUARE
40 20
50
20
10
O 30
60
F.V.
S.V.
O

6. STUDY
Z
ILLUSTRATIONS
F.V. & T.V. of an object are given. Draw it’s isometric view.
FV
40
10
O
30 D 45
10
50
O
80
TV

7. STUDY F.V. & T.V. of an object are given. Draw it’s isometric view.
Z
ILLUSTRATIONS
FV 40
X O 10 Y
100
10
25
TV
10 30 10
25
30 R O
20 D

8. STUDY F.V. & T.V. of an object are given. Draw it’s isometric view.
Z
ILLUSTRATIONS
30
FV
RECT.
SLOT
10 50
35
10
X Y
O
20 D
TV
60 D
30 D
O

9. STUDY
Z
ILLUSTRATIONS
F.V. and S.V.of an object are given. Draw it’s isometric view.
10
25 15
25
40 10
25
25
O O
80 25
F.V. S.V.

10. STUDY F.V. & T.V. of an object are given. Draw it’s isometric view.
Z
ILLUSTRATIONS
450
30
FV
40
X Y
O
30 D
40 TV
15
40
O

11. STUDY
Z
ILLUSTRATIONS
F.V. and S.V.of an object are given.
Draw it’s isometric view.
HEX PART
30
20
20
40
20
O 50
20
15
O 30
100 60

12. STUDY F.V. & T.V. of an object are given. Draw it’s isometric view.
Z
ILLUSTRATIONS
20 40
F.V.
30
10
X Y
O
10
30
10
30
O 80
T.V.

13. F.V. and S.V.of an object are given.
Draw it’s isometric view.
STUDY
10 10 15
Z
ILLUSTRATIONS
25
25
X Y
O 50 10
FV LSV
NOTE THE SMALL CHZNGE IN 2ND FV & SV.
DRAW ISOMETRIC ACCORDINGLY.
10
X Y
O FV LSV

14. STUDY
Z
ILLUSTRATIONS
F.V. and S.V.of an object are given.
Draw it’s isometric view.
30 20 10 20
15
10
15
O
15
30
15
X O Y
50
F.V. LEFT S.V.

15. STUDY
Z
ILLUSTRATIONS
F.V. and S.V.of an object are given.
Draw it’s isometric view.
30 10
60
30
O
O 40 40
F.V. S.V.