Transcript Reading the Micrometer By Mark Zidon University of Wisconsin-Platteville Objectives • Identify micrometer parts • Determine micrometer reading.

Reading the Micrometer
By
Mark Zidon
University of Wisconsin-Platteville
Objectives
• Identify micrometer parts
• Determine micrometer reading
This is a English micrometer
thimble
anvil
spindlesleeve
frame
For clarity we will use an animated figure.
3
0 1 212 3 4 5 6 7 8 9
0
24
23
22
Let’s take a close
look at the sleeve of
the micrometer.
One inch
(1.000)
25/1000
inch
(0.025)
01234567890
3
01234567890
2
1
0
24
23
22
1/1000 inch (0.001)
1/10 inch (0.100)
Now, an example...
Now, an example...
Smallest Measurement Largest sleeve reading
19
18
0 1 2 3 4 5 17
6789
16
15
0.000
0.300
0.025
0.016
14
13
0123
0.341 inchesOne mark past
largest sleeve
reading
Thimble Reading
15
18
17
16
14
13
15
A digital micrometer
Another example...
Another example...
Smallest Measurement Largest sleeve reading
20
15
3.000
0.400
0.075
0.021
3.496 inches
0 1 2 3 4
24
23
22
21
19
18
17
16
0
20
Thimble Reading
Three marks past largest
sleeve reading
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.