orthographicprojections-140423053405-phpapp01
DESCRIPTION
projectionsTRANSCRIPT
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)
Step by step procedure
Suggested to prepare
Orthographic views (First angle
method) for The simple
component Shown pictorially in
figure
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
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
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
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
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 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 :-