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Reading the Micrometer By Mark Zidon University of Wisconsin- Platteville
14

Reading A Micrometer

Feb 14, 2017

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Page 1: Reading A Micrometer

Reading the Micrometer

ByMark Zidon

University of Wisconsin-Platteville

Page 2: Reading A Micrometer

Objectives• Identify micrometer parts• Determine micrometer reading

Page 3: Reading A Micrometer

This is a English micrometer

thimblesleeveanvilspindle

frame

Page 4: Reading A Micrometer
Page 5: Reading A Micrometer

0 1 2 3 4 5 6 7 8 90

123

24

2223

For clarity we will use an animated figure.

Page 6: Reading A Micrometer

Let’s take a closeLet’s take a closelook at the sleeve look at the sleeve of the micrometer.of the micrometer.

Page 7: Reading A Micrometer

0 1 2 3 4 5 6 7 8 9 00

123

24

2223

0 1 2 3 4 5 6 7 8 9 0

1/10 inch (0.100)

25/1000 inch (0.025)

1/1000 inch (0.001)

One inch (1.000)

Page 8: Reading A Micrometer

Now, an example...

Page 9: Reading A Micrometer

0 1 2 3 4 5 6 7 8 9

15161718

14 13

19

151716

1413

1815

0 1 2 3

Smallest Measurement

0.000

Largest sleeve reading

0.300

Now, an example...

One mark pastlargest sleeve

reading

0.025

Thimble Reading

0.0160.341 inches

Page 10: Reading A Micrometer

A digital micrometer

Page 11: Reading A Micrometer

Another example...

Page 12: Reading A Micrometer

20

15

0 1 2 3 4

2019181716

24232221

0

Smallest MeasurementLargest sleeve reading

Three marks past largest sleeve reading

Thimble Reading

3.0000.4000.0750.021

3.496 inches

Another example...

Page 13: Reading A Micrometer

Review...• Lightly tighten on object.• Determine smallest

measurement when micrometer is closed.

• Find largest visible number on sleeve and multiply times 0.100.

Page 14: Reading A Micrometer

Review...• Count number of marks past

largest visible number on sleeve and multiply times 0.025.

• Multiply thimble reading times 0.001.

• Add all numbers to get answer.