Projections of Lines : Lecture No 03

1. Unit No:03
Projections of Points & Lines
Yash B. Parikh
M.Tech. (CIM)
Assistant Professor
Department of Mechanical Engineering
Symbiosis Institute of Technology

2. 2
Lines inclined to both Reference Planes
Oblique Lines:
 When the line is inclined to both the reference planes (i.e. H.P. &
V.P.) then that line is called the oblique line.
 Here P.L. & E.L both will be shorter than T.L.
 They will be inclined at apparent angles to XY reference line.
Where,
α > θ
β > Φ
Prof. Yash Parikh

3. 3
Steps to solve Oblique Line Problems
Stage 1 : Assume line parallel to both H.P. & V.P.
Stage 2 : make inclination of the line with first reference plane,
keeping it parallel to the second reference plane.
Stage 3: make inclination of the line with second reference plane,
keeping it parallel to the first reference plane
Prof. Yash Parikh

4. 4
Problem on Oblique Line
Question 1 :
A line AB is 100 mm long. It is inclined at 40˚ to H.P. & 30˚ to
V.P. The end A is 10 mm above H.P. and 25 mm in front of V.P.
Assuming end B is in first quadrant, draw the projections of the
line AB.
Prof. Yash Parikh

5. 5
Thank You
Prof. Yash Parikh