Orthographic projections
24
X Fig 2(b) P.P H D R.H.S.V. Z 2 Y X V.P L F.V. H.P T.V. Z 2 L D H Fig 2(a) X Y Y Y
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Transcript of Orthographic projections
X
Fig 2(b)
P.P
H
D
R.H.S.V.
Z2
Y
X
V.P
L
F.V.
H.PT.V.
Z2
LD
H
Fig 2(a)
X
Y
YY
Note : Ist angle means, the block is assumed in
front of V.P, above H.P and inside P.P,
as in fig. 2(b) where the F.V. is
projected on V.P, seen in X direction,
T.V. is projected on H.P, seen in Y
direction & R.H.S.V. is projected on
P.P, seen in Z2 direction
It may be noted that :-
a) F.V. (X directional view) is on V.P, T.V. (Y directional view) is on H.P, while R.H.S.V (Z2 directional view) is on P.P
Fig. 2(c) shows turning of the planes H.P & P.P with their respective hinges, considering plane V.P as fixed plane.
b) F.V is within L & H, T.V is within L & D, While R.H.S.V is within H & D.
c) The symbol for Ist angle method of projections is
placed as shown on fig. 2(c)
Fig. 2(c)
H.P
T.V.
L
F.V.
V.P
X YR.H.S.V.
D
P.P
H
Step by step procedure
Suggested to prepare
Orthographic views (First angle
method) for The simple
component Shown pictorially in
figure
100
20
80
20
20
40
20
60
R40
Ø4
0ISOMETRIC ISOMETRIC
VIEWVIEW XX
R40
20
100
80ø40
80
20
TOP VIEWTOP VIEW
FRONT VIEWFRONT VIEWR.H.S.VR.H.S.V
SCALE: 1:1SCALE: 1:1
SYMBOLSYMBOL IS IS NOT MARKEDNOT MARKED
20 20
R20
FIGURE SHOWS ISOMETRIC VIEW OF A SIMPLE OBJECT(WITHOUT DIMENSIONS) SHOW ITS THREE ORTHOGRAPHIC VIEWS
Use First Angle Method
1. Front View
2. Top View
3. L.H.S.ViewA
B
a
b
3
c
2
1
F.V
T.V
L.H.S.V.
B
a
bc
32
1
b
3
A
FIGURE SHOWS ISOMETRIC VIEW OF AN OBJECT(WITHOUT DIMENSIONS) SHOW ITS THREE ORTHO GRAPHIC VIEWS
Use Third Angle Method
1. Front View
2. Top View
3. L.H.S.View
1. Front View
2. Top View
3. L.H.S.ViewA
a
b
3 c
2
1
FRONT VIEWL.H.S VIEW
TOP VIEW
A
ab
3
c
2 1
Aim : Figure shows isometric view, of a simple machine component.
Draw its following Orthographic views, & dimension them.
1. Front View2. Top View3. R.H.S. View
Use First Angle Method of projection
10
10
Figure, is the isometric view
10
50
75
40
20
R25
30X
Figure
L = 75+25=100
H = 10+30=40
D=50
R2510
10
20
F.V.
5010
40
25 75
40
T.V.
R.H.S.V.
ORTHOGRAPHIC VIEWS
F.V L=100H=40
T.V L=100D=50
S.V D=50H=40
5
5
45
35
35
30
40
15
10
25 SQ
15 SQ
10
Ø30,Depth 1040 SQ
ISOMETRIC
ORTHO. VIEWS
25 Sq25 Sq
40
40
15
15
454535353535
15 Sq15 Sq
40 Sq40 Sq
Ø30Ø30
55
10
10
30
30
10
10
551
01
0
R.H.R.H.S.V.S.V.
F.V.F.V.
T.V.T.V.
Figure shows the isometric view of a vertical shaft support.
Draw its all the three views, using first angle method of projections.
Give the necessary dimensions as per aligned system.
Exercise :-
ISOMETRIC ISOMETRIC VIEWVIEW
140
Ø40
Ø64
24
20
10
4850
25
1414
48
70
24
10
Ø40
50
Ø64
30
140
L.H.S.VL.H.S.VFRONT VIEWFRONT VIEW
TOP VIEWTOP VIEW
Isometric view of a rod support is
given.
Draw its all the three orthographic
views, using first angle method of
projections.
Give all the dimensions.
Exercise :-Exercise :-
ISOMETRIC VIEW
16
20
4020
20
20
Ø24
R22
140
40
80 60
30
X
TOP VIEW
R22
2040
10
FRONT VIEWRIGHT SIDE
VIEW
14020
80
SCALE: 1:1
3030
66
26
30
108
20R20
100
45
16
20
25R8
10
30
30
ISOMETRIC
ORTHO. VIEWS
4530 8
20 25
16
R8
R2030
20
10
100
