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8/13/2019 Reading a micrometer_2.ppt
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Reading the Micrometer
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Know the names of the different parts of the Micrometer.
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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.
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Rules forUsing a
Micrometer
Do not use as a C-clamp
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Rules for Using a Micrometer
Always undo with the thimble.
If you undo with the ratchet you may unscrew it.
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Rules for Using a Micrometer
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.
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Rules for Using a Micrometer
When storing the micrometer always leave some
space between the anvil and the spindle.
Do Not leave tight.
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Rules for Using a Micrometer
Learn how to hold it in your hand so it is
comfortable to hold.
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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
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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.
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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
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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
and the thimble is turned to the 18 so we have .018
add it together and we have .293
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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
and the thimble is turned to the 24 so we have .024
add it together and we have .424
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The last large Number is 1 so we have .100
we have 1 line past the 1 so we have .025
and the thimble is turned to the 13 so we have .013
add it together and we have .138
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The last large Number is 2 so we have .200
we have 1 line past the 2 so we have .025
and the thimble is turned to the 12 so we have .012
add it together and we have .237
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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.jpg8/13/2019 Reading a micrometer_2.ppt
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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
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Try this one?Get the answer before you look!!
.625 Dont forget the decimal
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The End
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