Micrometre Screw gauge

CH-5 MeasurementsModern Metal working by John R Walker

• Objectives:

• To learn the procedure of using MICROMETER SCREW GUAGE.

Micrometer: Is a tool designed to measure the thickness of an object

SCREW GAUGE/ MICRO METER

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

HSR = Head Scale Reading

LC = Least Count

QUESTION 1

MSR = 7 mm

HSR = 0 x 0.01 mm = 0 mm

Total Reading = 7 mm

QUESTION 2

• MSR = 8 mm• HSR = 12 x 0.01 mm = 0.12 mm• Total Reading = 8.12 mm

QUESTION 3

MSR = 8.5mmHSR = 12*0.01=0.12Total Reading =8.5+0.12=8.62

Answer : 12. 69

QUESTION 4

QUESTION 5

Answer : 23.99