1. Using the Vernier Caliper and the Micrometer
A Powerpoint Presentation by
Mr. Fernando D. Nolasco

2. Try this.
When you use your ruler, how do you measure the diameter of a PENCIL OR A PEN TUBE?

3. A Better Way

4. Vernier Caliper

5. Parts of a Vernier Caliper
Internal Jaws
External Jaws

6. Parts of a Vernier Caliper

7. Two Scales Are Better Than One
The vernier caliper has two scales: the main scale and the vernier scale
The main scale is similar to the scale found on an Orion plastic ruler, graduated in millimeters (mm).
The vernier scale is graduated into mm marks.

8. Main Scale
Vernier Scale

9. 0.000, , 0.150, , , 0.300, etc
Vernier Scale

10. Reading the Vernier Caliper
Locate the “0” mark on the vernier scale.
Determine the last mark on the main scale which was passed by the “0” mark of the vernier scale. (to the left)
Determine which mark on the vernier scale lines up with ANY mark on the main scale.
Complete the reading by adding the doubtful figure, usually “0” and the units (i.e. mm)

12. 13

13. 13

14. 13.65

15. ! ! ! ! ? mm

16. 23

17. 23

18. 23.70

19. ! ! ! ! ? mm

20. 48

21. 48.55

22. ! ! ! ! ? mm

23. 75

24. 75.40

25. ! ! ! ! ? mm

26. Micrometer

30. Two Scales Are Better Than One
The micrometer has two scales: the main or linear scale and the rotating scale.
The main scale or linear scale is graduated into mm marks.
The rotating scale is composed of 50 divisions, each graduated into mm marks.

31. Linear scale divided into 0.500 mm marks

32. Whole Marks: , 1.000, , , etc
Half Marks: 0.500, , , etc

33. Rotating scale with 50 divisions, each equal to 0.010 mm

34. Like Clockwork
The micrometer scales work like the minute and hour hands of a clock.
Each complete revolution of the minute hand (12 numbers) advances or sets back the hour hand by 1 number.
Each complete rotation on the rotating scale (50 divisions) advances or closes the linear scale by mm.

35. Micrometer closed mm

36. After first rotation - 0.500 mm

37. After second rotation - 1.000 mm

38. After third rotation - 1.500 mm

39. ! ! ! ? Linear Scale: 3.000 Rotating Scale: 0.270 Reading: 3.270 mm
To get the final reading, simply add the readings on the linear and rotating scales
Linear Scale:
Rotating Scale:
! ! ! ?
Reading: mm

40. Linear scale:
Rotating scale:
! ! !?
Reading: mm

41. Linear scale:
Rotating scale:
! ! !?
Reading: mm