micrometer screw gauge

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MICROMETER SCREW GAUGE Used to measure length of small objects Scale is always in mm, with 2 decimal places. (sensitivity 0.01mm) 用用用用用用用用用 用用用 2用 How to use: 1. Open the micrometer screw gauge by turning the thimble. 2. Place the object that you want to measure in between the anvil & spindle, and tighten the micrometer screw gauge by turning the thimble. (note: do not over tighten if not it will be spoilt. Once it is the tightest and you turn some more, you will hear a clicking sound) 3. The reading on the scale is the length of your object. P h y s i c s M o d u l e F o r m 4 C h a p t e r 1 : I n t r o d u c t i o n T o P h y

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P h y s i c s M o d u l e F o r m 4 C h a p t e r 1 : I n t r o d u c t i o n T o P h y s i c s _ _ _ _

MICROMETER SCREW GAUGE Used to measure length of small objects Scale is always in mm, with 2 decimal places. (sensitivity 0.01mm) 2

How to use: 1. Open the micrometer screw gauge by turning the thimble. 2. Place the object that you want to measure in between the anvil & spindle, and tighten the micrometer screw gauge by turning the thimble. (note: do not over tighten if not it will be spoilt. Once it is the tightest and you turn some more, you will hear a clicking sound) 3. The reading on the scale is the length of your object.

1 thimble micrometer screw gauge 2 anvil spindle micrometer screw gauge 3

Reading = main scale reading + (0.01 mm x thimble scale )

ZERO ERROR i) No zero error the 0 mark on the thimble scale is exactly in line with the horizontal reference line on the main scale when the micrometer is closed ii) Positive zero error the horizontal reference line in the main scale is in line on the positive side of the 0 mark, on the thimble scale. The positive error reading is = + 0.04 mm

iii) Negative zero error the horizontal reference line on the main scale is in line below the 0 mark of thimble scale.The negative error reading is = 0.03 mm.

the

MUST MINUS/ADD ZERO ERROR TO GET ACTUAL READING ZERO ERROR

Exercises 1. Write down the readings shown by the following micrometer screw gauges. (a)0 5 400 5

(b)10 3 5 3 0

35

Answer: . (c)0

Answer:.. (d)

25 20

0

5

20 15

Answer:

Answer:.

2.

(a) Determine the readings of the following micrometer screw gauges. 0 45

0

0

5

0

Zero error = .. mm

Zero error = ........ mm

(b) Determine the readings of the following micrometer screw gauges.0

0

5 0

5

20

15 Reading shown = 6.67..mm

Zero error = 0.03mm

Corrected reading = 6.64..mm