1. Engineering Graphics 2018-19-I
Lecture 5
TA101A
Engineering Graphics I By
Dr. Mukesh Sharma
Professor
DEPARTMENT OF CIVIL ENGINEERING
INDIAN INSTITUTE OF TECHNOLOGY KANPUR
KANPUR , INDIA

2. Quadrant 1 and Quadrant 3 are Used for Orthographic Projections
Above
Above
Front
2nd
1st Quad
3rd Quad
4th
Front
Viewing Direction is same irrespective of quadrant where object is kept
Quadrant 1 and Quadrant 3 are Used for Orthographic Projections
In whatever Quadrant the object is in, viewing directions are same
In what quadrant, so far, we have been keeping the object in?

3. Revisit 3rd Angle Projection Scheme
This is Profile Plane
Here too
Observer – Plane - Object
RECAP of Concept
Object Plane Observer

4. 1st Angle Projection SchemeRS LS
Front
Top
See the positions of Front, top, RS, LS Views
Examine how different these are from 3rd angle projection
And why?
Hinge
Plane Object Observer

5. Areas to avoid – Place them so to read conveniently
126
450
100 80
Avoid
Areas to avoid – Place them so to read conveniently

6. CORRECT
INCORRECT

7. Omit unnecessary dimensions.

8. Dimensioning of arcs
Single arrow, inclined, show where true shape
(aligned and unidirectional)

9. Equally spaced holes.

10. Dimensioning in limited spaces6 3 22 19
4.8 5 22
ø26 18
21.5 12
300’ 45”
Dimensioning in limited spaces

11. } Today’s Quiz Drawn in Title Block to indicate type of projection.
Identify the angle of projection }
Drawn in Title Block to indicate type of projection.
Third angle
First angle
Third angle

12. Dimensioning in limited spaces6 3 22 19
4.8 5 22
ø26 18
21.5 12
300’ 45”
Dimensioning in limited spaces

18. L M G A B E 64 120 L,M C F H K D G,E G J 75 C C,D D, F H,J K J, K H48 36 L 25 M 75 G 46 A B E 64
120
L,M C F H K D 22
G,E G 35 22 J 64 75 C
C,D
D, F
H,J K
J, K H
L,G E
F,K M C
D,J H