Reading a micrometer_2.ppt

8/13/2019 Reading a micrometer_2.ppt

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Reading the Micrometer


2/20

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Know the names of the different parts of the Micrometer.


3/20

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Rules for Using

a Micrometer

Never take hold of the thimble and whirl the

frame around to open or close the micrometer.


4/20

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Rules forUsing a

Micrometer

Do not use as a C-clamp


5/20


6/20

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Rules for Using a Micrometer

Always undo with the thimble.

If you undo with the ratchet you may unscrew it.


7/20

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When you have to open or close the micrometer along way. Hold it in one hand and roll it in the palm

of the other hand.


8/20

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When storing the micrometer always leave some

space between the anvil and the spindle.

Do Not leave tight.


9/20

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Learn how to hold it in your hand so it is

comfortable to hold.


10/20

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The sleeve goes from 0 to 0. The last 0 could have a

10 there. It represents a movement of 1 inch (1.000)

Each large number is equal to .100. 1= .100, 2= .200,

5= .500 etc. The Lines in between the numbers

represent .025 thousands of and you would count

them up .025, .050, .075, .100


11/20

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The Thimble on the side of the sleeve moves as you

rotate it. Each mark is = to .001. Each time it moves

one full turn it travels a distance of .025.


12/20

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To read you must take each section and add it togetherThe last large Number is 5 so we have .500

we have one line past the 5 so we have .025

and the thimble is turned to the 7 so we have .007

add it together and we have .532


13/20

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The last large Number is 2 so we have .200

we have three lines past the 2 so we have .075




14/20

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The last large Number is 4 so we have .400We have one line that is partially showing but the

thimble is not past the 0 so we have .000




15/20

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we have 1 line past the 1 so we have .025




16/20

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we have 1 line past the 2 so we have .025




17/20

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Some times the thimble is part way in between the two numbers.

What you really need is a vernier Micrometer.

A vernier micrometer will

allow you to read to ten-

thousandths of an inch.
http://www.nationmaster.com/encyclopedia/Image:5783metric_micrometer.jpg


18/20

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But since we dont with the micrometers I have, this is

what you can do. You will have to carry it out to a 4th

digit. That is ten thousandths of an inch. Write down

the answer to this problem add a .0005 to it because it isabout halfway in between the 12 and 13.

.6875


19/20

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Try this one?Get the answer before you look!!

.625 Dont forget the decimal


20/20

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Reading a micrometer_2.ppt