Reading the Micrometer By Mark Zidon University of Wisconsin- Platteville
Let’s take a closeLet’s take a closelook at the sleeve look at the sleeve of the micrometer.of the 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)
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
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...
Review...• Lightly tighten on object.• Determine smallest
measurement when micrometer is closed.
• Find largest visible number on sleeve and multiply times 0.100.