1. Reading the Micrometer

2. Objectives
Identify micrometer parts
Determine micrometer reading

3. This is a English micrometer
sleeve
thimble
anvil
spindle
frame

5. For clarity we will use an animated figure.1 2 3 24 22 23

6. look at the sleeve of the micrometer.
Let’s take a close
look at the sleeve of the micrometer.

7.
One inch (1.000)
25/1000 inch (0.025) 1 2 3 24 22 23
1/1000 inch (0.001)
1/10 inch (0.100)

8. 15 14 13 12 11 10 9

9. Now, an example...

10. Largest sleeve reading
Now, an example...
Smallest Measurement
Largest sleeve reading 15 17 16 14 13 18 19 18 17
0.000 16 15 14 13
0.300
0.025
0.016
0.341 inches
One mark past
largest sleeve
reading
Thimble Reading

11. A digital micrometer

12. Another example...

13. Largest sleeve reading Three marks past largest sleeve reading
Another example...
Smallest Measurement
Largest sleeve reading 20 19 18 17 16 24 23 22 21 20 15
3.000
0.400
0.075
0.021
Thimble Reading
Three marks past largest sleeve reading
3.496 inches

14. Review... Lightly tighten on object.
Determine smallest measurement when micrometer is closed.
Find largest visible number on sleeve and multiply times

15. Review...
Count number of marks past largest visible number on sleeve and multiply times
Multiply thimble reading times
Add all numbers to get answer.