1. Engineering Graphics 2018-19-I
Lecture 15
TA101A
Engineering Graphics I By
Dr. Mukesh Sharma
Professor
DEPARTMENT OF CIVIL ENGINEERING
INDIAN INSTITUTE OF TECHNOLOGY KANPUR
KANPUR , INDIA

2. Draw the projection of point A in different planes

3. HP P
120° X a H Q
HINGE LINE d1 d3 A S d2 d4 a X
ax1 VP a F R F

4. A1 P d4 ? Ax d3 d3 d1 ? AH
Ax1 A2 BH Q d2 HP d1 BF AF

5. . . . N: Normal View Direction of sight is perpendicular or Normal
What will it give? . N N . N N N . N
Horizontal frontal
Horizontal - Profile
frontal - Profile A B C N N N
Horizontal
Frontal
Profile
(Inclined to frontal and profile)
(Inclined to horizontal and profile)
(Inclined to horizontal and frontal)

6. F H aH aF bH bF
Is it frontal, horizontal or profile line?
It is none, as it is inclined to all principal planes and called Oblique line
Will it appear in true length (TL) in any of the principal plane?
Let us learn how to find TL of an Oblique line

7. Observe
All are parallel to hinge line in top view aH aH aH aH aH H F bF bF
Observe
All are in TL in Front view bF bF aF

8. bH bH
Observe
All are in TL in Top view bH bH aH H F
Observe
All are parallel to hinge line in
Front view bF bF bF aF bF

9. Leads to very important Concept ?
If line appears parallel to hinge line in a plane …...

10. bH aH H F aF TL bF
bF-
Method of Rotation

11. Method of Rotation – make line parallel to HPbH
bH- TL aH HF aF bF
Method of Rotation – make line parallel to HP