1. Micrometer Vernier caliper
EXPERIMENT # 1
PRECISE MEASUREMENTS
Micrometer
Vernier caliper

2. Objectives:
To determine the diameter of a metal ball and the length of the cube using VERNIER CALIPER.
To measure the diameter of the wire using MICROMETER.

3. VERNIER CALIPER

4. PARTS OF A VERNIER CALIPER
1 - Outside jaws: used to take external
measures of objects
2 - Inside jaws: used to take internal
3 - Depth probe: used to measure the depth
of objects
4 - Main scale (cm & inch)
5 - Vernier Scale
6 - Retainer: used to block movable part

5. Measuring Using the Vernier:
Keep the body to be measured between the fixed jaw and mobile jaw
Without pressure on it.
Take the main scale reading.
The division of the vernier that coincides with any division on the main scale is
also noted. This is the vernier scale reading.
Then, the measurement of the object will be
= Main scale reading + (vernier scale reading x least count)
Here,
Least count = Value of One Main Scale Division / Total Number of Divisions
on the Vernier Scale
The units of measurement is in millimeters (mm).

6. For vernier caliper:
Total reading = MSR + (VSR x LC)
MSR = Main Scale Reading
VSR = Vernier Scale Reading
LC = Least Count
MSR = 2.7cm x 10 = 27mm
VSR = 1(5) = 5 x 0.02 mm = 0.1mm
Total Reading = 27.1 mm

7. Electronic vernier calipers are also available The procedure for taking measurements remains the same.

8. MSR = .9 cm x 10 = 9 mm
VSR =3.6(5) = 18 x 0.02 mm = .36 mm
Total Reading = 9.36 mm

9. MSR = ______________________________
VSR = ______________________________
Total Reading = _______________________

10. MSR VSR 1 2 3 MSR VSR 1 2 3 Dimension Dimension MEAN THICKNESS
Trial No.
MSR
VSR
TOTAL
=MSR + (VSR X LC)
CORRECTED READING
MEAN THICKNESS
THICKNESS OF THE CUBE 1 2 3
Dimension
Trial No.
MSR
VSR
TOTAL
=MSR + (VSR X LC)
CORRECTED READING
MEAN DIAMETER
DIAMETER OF THE BOB 1 2 3

11. SCREW GAUGE/ MICRO METER
Micrometer: Is a tool designed to measure the thickness of an object

13.  MEASURING USING THE MICROMETER:
1. Keep the object between the measuring jaws.
2. Bring the measuring jaws together by turning
the screw until the object is clamped and the
thickness to be read no longer changes.
3. Take the main reading and the head scale
reading.

14. For micrometer:
Total reading = MSR + (HSR x LC)
MSR = Main Scale Reading
HSR = Head Scale Reading
LC = Least Count
QUESTION 1
MSR = 7 mm
HSR = 0 x 0.01 mm = 0 mm
Total Reading = 7 mm

15. QUESTION 2
MSR = 8 mm
HSR = 12 x 0.01 mm = 0.12 mm
Total Reading = 8.12 mm

16. QUESTION 3 MSR = __________________________
HSR = __________________________
Total Reading = ___________________

17. Electronic screw gauge is also available
Electronic screw gauge is also available. The procedure for taking the measurements remains the same

18. PSR HSR PSR HSR Dimension Dimension MEAN THICKNESS MEAN DIAMETER
Trial No.
PSR
HSR
TOTAL
=PSR + (HSR X LC)
CORRECTED READING
MEAN THICKNESS
THICKNESS OF THE LENSE
Dimension
Trial No.
PSR
HSR
TOTAL
=MSR + (VSR X LC)
CORRECTED READING
MEAN DIAMETER
DIAMETER OF WIRE

19. Conclusion:
The diameter of the metal ball is _____________
The length of the cube is ____________.
The diameter of the wire is ____________.