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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

Micrometer Screw Gauge

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Page 1: Micrometer Screw Gauge

MICROMETER SCREW GAUGEUsed to measure length of small objects

Scale is always in mm, with 2 decimal places. (sensitivity 0.01mm)用于量小物件的长度

尺度始终是毫米,2位小数位。

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.

如何使用:1。先转动 “thimble” 來 micrometer screw gauge。2。将你要量的物件放在 anvil和 spindle之间,并拧紧micrometer screw gauge。 (注:不要拧得太紧,不然会佷容易坏。当它已经是最紧时,你会听到喀嚓声)3。标尺上的读数是你的物件的长度。

Physics Module Form 4Chapter 1 : Introduction To Physics_____

Page 2: Micrometer Screw Gauge

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

Page 3: Micrometer Screw Gauge

ZERO ERRORi) 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 errorthe 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 errorthe horizontal reference line on the main scale is in line below the ‘0’ mark of the

thimble scale.The negative error reading is = 0.03 mm.

MUST MINUS/ADD ZERO ERROR TO GET ACTUAL READING必须减或加 ZERO ERROR 才能得到正确的答案

Page 4: Micrometer Screw Gauge

Exercises1. Write down the readings shown by the following micrometer screw gauges.

(a) (b)

Answer: …………………………. Answer:…………………..

(c) (d)

Answer:………………………… Answer:…………………….

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

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

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

35

400 5

30

0 5 10 35

20

250

0 0

45

5

0

0

15

200 5

5

0

0 0 5

15

20

Zero error = 0.03……… Reading shown = 6.67………..mm

Corrected reading = 6.64………..mm