The document discusses the principle of vernier calipers and how to calculate the least count. It explains that the least count is calculated as the difference between the number of divisions on the main scale and vernier scale. Using more divisions on the vernier scale results in a smaller least count and higher precision. It also considers what would happen if the number of divisions did not follow the principle, and asks what the least count would be if the number of divisions did not match and if the instrument could still be used.

1. Creative
Teaching

2. Vernier Caliper Principle -
Revisited

8. A
B
X
X = A – B = Least Count

9. Why?
9 Divisions =10 Divisions
(On Main Scale) (On Vernier Scale)

10. Why Not?
8 = 10
(On Main Scale) (On Vernier Scale)
Why not?
7 = 10
(On Main Scale) (On Vernier Scale)
Why not?
6 = 10
(On Main Scale) (On Vernier Scale)

11. Let us solve some examples ……

22. 0.70
0.60
N=9
0.50
0.40
0.30
N=19
LC(mm) 0.20
N=39
0.10
N=49
N=79
0.00
1 2 3 4 5 6
N+1 N+2 N+3 N+4 N+5 N+6

23. Conclusions:
1. N+1 = N principle gives minimum least count
2. Increase in N gives minimum least count
3. Students will enjoy the meaning behind the
principle
4. Students start exploring the engineering
principles without blindly accepting any concept

24. Question ?
If by mistake 10 divisions on Main Scale are made equal to
9 divisions on Vernier Scale, then what is the least count?
Is it possible to use the instrument? If it is usable, HOW?
10 Divisions on Main Scale
9 Divisions on Vernier Scale

25. Thank You
Dr.P.Madar Valli
Professor
Industrial Engineering Department
GIT,Gitam University
Visakhapatnam,India