Post on 22-Jan-2017
Gandhinagar Institute Of Technology
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Active Learning Assignment
Electrical F1
Orthographic projection
Engineering Graphics(2110013)
Name ENROLLMENT NO. Abhishek Chokshi 140120109005Himal DesaiHarsh Dedakia
PREPARED BY:-
140120109008140120109012
Orthographic Projections
What is orthographic projection? Basically, orthographic projection
means a 2-dimensional representation of and 3-
dimensional solid object. The object is represented by
projecting lines from its edges such that the lines are
orthogonal to the projection plane.
Types of orthographic projection: Basically, there are 2 types of
orthographic projection. They are:
1) 1st angle projection And
2)3rd angle projection
They are explained below.
PROJECTION SYSTEMS1. First angle system
2. Third angle system
First Quadrant
ThirdQuadrant
1st angle & 3rd angle projection
The one and only difference between 1st angle & 3rd angle projection is that only the representation positions of
plan (top view), bottom view and side view.
In 1st angle projection, the front view is in center, top view is below front
view, bottom view is above front view, RHSV(right hand side view) is to the left of front view and LHSV(left hand
side view) is to the right of front view.
ORTHOGRAPHIC PROJECTION1st angle system 3rd angle system
ORTHOGRAPHIC VIEWS1st angle system 3rd angle system
Foldingline
Foldingline
Foldingline
Foldingline
ORTHOGRAPHIC VIEWS1st angle system 3rd angle system
Front View
Front View
Right Side View
Right Side View
Top View
Top View
First angle system
Third angle system
PROJECTION SYMBOLS
SYMBOLS USED ON ENGINEERING DRAWING SHEET
FIRST ANGLE METHOD OF
ORTHOGRAPHIC PROJECTIONS
THIRD ANGLE METHOD OF
ORTHOGRAPHIC PROJECTIONS
M/c. PARTS ARE NEVER ASSUMED IN SECOND OR IN FOURTH QUADRANT, AS THE VIEWS MAY OVERLAP ON ONE ANOTHER ABOVE XY OR BELOW XY RESPECTIVELY.
Step by step procedure Suggested
to prepare Orthographic views (First
angle method) for The simple
component Shown pictorially in
figure
5
5
45
35
35
30
40
15
10
25 SQ
15 SQ
10
Ø30,Depth 1040 SQ
ISOMETRIC ORTHO. VIEWS
25 Sq
4015
453535
15 Sq
40 Sq
Ø30
5
10
30
10
510
R.H.S.V.
F.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
140
Ø40
Ø64
24
20
10
4850
25
L.H.S.VFRONT VIEW
TOP VIEW
1414
48
70
24
10
Ø40
50
Ø64
30
140
SectionalOrthographic
Projection
Sectional view of solids Sectional view is used to indicate that
when the solid is cut from a particular plane, where there is mass and where
it is hollow.
Straight lines at 45 degree angle are drawn at distance of 0.25 mm to
indicate the mass and the part that is hollow is kept plain
Also, in sectional view, no hidden lines are to be indicated.
Aim:-Sketch-1, shows Isometric View of a machine part. Draw its following orthographic views using third angle method of projections, giving dimensions.
(1) Sectional F.V.-AA(2) T.V.(3) L.H.S.V
A
A
14
8
65
Φ20R35
Φ36
70100
A
ALEFT HAND SIDE VIEW SECTIONAL FRONT VIEW AA
TOP VIEW
X
SCALE:- 1:1SYMBOL OF PROJECTION METHOD, NOT SHOWN
Sketch-1
14
30
14
70
34
2 HOLES,Φ 14
Φ36
Φ20
R35 8
100
14
65
14 `
100
App
rox.
25
AA
SOLUTION`
14
1414
8
30
70 14
1414
8
100
A
ALEFT HAND SIDE VIEW SECTIONAL FRONT VIEW AA
TOP VIEW
SCALE:- 1:1SYMBOL OF PROJECTION METHOD, NOT SHOWN
SOLUTION`
App
rox.
25
AA
100
14
8
65
Φ20R35
Φ36
2 HOLES,Φ 14
X
34
Φ36
Φ20
R35
A
A
Aim:-Sketch-1, shows Isometric View of a machine part. Draw its following orthographic views using third angle method of projections, giving dimensions.(1) Sectional F.V.-AA(2) T.V.(3) L.H.S.V
14
30
Hatch (section) lines, to be kept at 1 to 1.5 mm apart, at 45° normally, but depends on areas to be hatched.
141448 70
50
10
30
40,DEPTH 24
60
Ø64
30
140
24
Ø40
5010
L.H.S.VFRONT VIEW
1414
4870
TOP VIEW
THANK YOUFOR ATTENTION