Download - Reading the Micrometer. Objectives Identify micrometer parts Determine micrometer reading
Reading the Micrometer
Objectives
• Identify micrometer parts• Determine micrometer reading
This is a English micrometer
thimblesleeveanvilspindle
frame
0 1 2 3 4 5 6 7 8 9
0123
24
2223
For clarity we will use an animated figure.
Let’s take a closelook at the sleeve of the micrometer.
0 1 2 3 4 5 6 7 8 9 0
0123
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)
Now, an example...
0 1 2 3 4 5 6 7 8 9
15161718
14 13
19
15
1716
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
0.016
0.341 inches
A digital micrometer
Another example...
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.
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.