Reading the Micrometer By Mark Zidon University of

Reading the Micrometer By Mark Zidon University of

Reading the Micrometer By Mark Zidon University of Wisconsin-Platteville Objectives Identify micrometer parts Determine micrometer reading This is a English

micrometer sleeve thimble anvil spindle frame For clarity we will use an animated figure. 3

0 1 212 3 4 5 6 7 8 9 0 24 23 22 Lets take a close look at the sleeve of the micrometer.

One inchinch (1.000) 25/1000 (0.025) 01234567890 01234567890 3

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 0.000 0.300 0.025 0.016 15 14

13 One mark past 0.341 inches 0123 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

0 20 19 18 17 16 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.

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