X Fig 2(b) P.P H D R.H.S.V. Z2Z2 Y X V.P L F.V. H.P T.V. Z2Z2 L D H Fig 2(a) X Y YY

Note : I st 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 Z 2 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 (Z 2 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 I st 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 Y R.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

R40 Ø40 ISOMETRIC VIEW X

R ø TOP VIEW FRONT VIEW R.H.S.V SCALE: 1:1 SYMBOL IS NOT MARKED 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.View A B a b 3 c 2 1

F.V T.V L.H.S.V. B a b c 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.View A a b 3 c 2 1

FRONT VIEW L.H.S VIEW TOP VIEW A 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 View 2. Top View 3. R.H.S. View Use First Angle Method of projection

10 Figure, is the isometric view R25 30 X Figure L = 75+25=100 H = 10+30=40 D=50

R F.V T.V. R.H.S.V. ORTHOGRAPHIC VIEWS F.V L=100 H=40 T.V L=100 D=50 S.V D=50 H=40

SQ 15 SQ 10 Ø30,Depth SQ ISOMETRIC ORTHO. VIEWS

25 Sq Sq 40 Sq Ø R.H. S.V. F.V. T.V.

FF igure shows the isometric view of a vertical shaft support. DD raw its all the three views, using first angle method of projections. GG ive the necessary dimensions as per aligned system. Exercise :-

ISOMETRIC VIEW 140 Ø40 Ø

Ø40 50 Ø L.H.S.V FRONT VIEW TOP 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 :-

ISOMETRIC VIEW Ø24 R X

TOP VIEW R FRONT VIEW RIGHT SIDE VIEW SCALE: 1:

10 8  20 R R ISOMETRIC ORTHO. VIEWS

R8 R20 30 