EXPERIMENT # 1
Micrometer
Vernier caliper
 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.
VERNIER CALIPER
PARTS OF A VERNIER CALIPER
1 - Outside jaws: used to take external
measures of objects
2 - Inside jaws: used to take internal
measures of objects
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
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).
For vernier caliper:
Total reading = MSR + (VSR x LC)
MSR = Main Scale Reading
MSR = 2.7cm x 10 = 27mm
VSR = Vernier Scale Reading
VSR = 1(5) = 5 x 0.02 mm = 0.1mm
LC = Least Count
Total Reading = 27.1 mm
Electronic vernier calipers are also available The
procedure for taking measurements remains the
same.
MSR = .9 cm x 10 = 9 mm
VSR =3.6(5) = 18 x 0.02 mm = .36 mm
Total Reading = 9.36 mm
MSR = ______________________________
VSR = ______________________________
Total Reading = _______________________
Dimension
Trial No.
THICKNESS
OF THE
CUBE
1
MSR
VSR
TOTAL
=MSR +
(VSR X
LC)
CORRECTED
READING
MEAN
THICKNESS
2
3
Dimension
Trial No.
DIAMETER
OF THE BOB
1
2
3
MSR
VSR
TOTAL
=MSR +
(VSR X
LC)
CORRECTED
READING
MEAN
DIAMETER
SCREW GAUGE/ MICRO METER
Micrometer: Is a tool designed to measure
the thickness of an object
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.
For micrometer:
Total reading = MSR + (HSR x LC)
MSR = Main Scale Reading
MSR = 7 mm
HSR = Head Scale Reading
HSR = 0 x 0.01 mm = 0 mm
LC = Least Count
Total Reading = 7 mm
QUESTION 1
QUESTION 2
MSR = 8 mm
HSR = 12 x 0.01 mm = 0.12 mm
Total Reading = 8.12 mm
QUESTION 3
MSR = __________________________
HSR = __________________________
Total Reading = ___________________
Electronic screw gauge is also available. The
procedure for taking the measurements remains
the same
Dimension
Trial No.
PSR
HSR
TOTAL
=PSR +
(HSR X
LC)
CORRECTED
READING
MEAN
THICKNESS
THICKNESS OF
THE LENSE
Dimension
DIAMETER
OF WIRE
Trial No.
PSR
HSR
TOTAL
=MSR +
(VSR X
LC)
CORRECTED
READING
MEAN
DIAMETER
•Conclusion:
The diameter of the metal ball is _____________
The length of the cube is
____________.
The diameter of the wire is
____________.