Reading the Micrometer

Know the names of the different parts of the Micrometer.

Rules for Using a Micrometer Never take hold of the thimble and whirl the frame around to open or close the micrometer. Never take hold of the thimble and whirl the frame around to open or close the micrometer.

Rules for Using a Micrometer Do not use as a C-clamp Do not use as a C-clamp

Rules for Using a Micrometer Always use the Ratchet Stop to tighten the micrometer.

Rules for Using a Micrometer Always undo with the thimble. Always undo with the thimble. If you undo with the ratchet you may unscrew it. If you undo with the ratchet you may unscrew it.

Rules for Using a Micrometer When you have to open or close the micrometer a long way. Hold it in one hand and roll it in the palm of the other hand. When you have to open or close the micrometer a long way. Hold it in one hand and roll it in the palm of the other hand.

Rules for Using a Micrometer When storing the micrometer always leave some space between the anvil and the spindle. When storing the micrometer always leave some space between the anvil and the spindle. Do Not leave tight. Do Not leave tight.

Rules for Using a Micrometer Learn how to hold it in your hand so it is comfortable to hold. Learn how to hold it in your hand so it is comfortable to hold.

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, 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

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.

To read you must take each section and add it together The 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

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

The last large Number is 4 so we have.400 We 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

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

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

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.

But since we don’t 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 is about halfway in between the 12 and

Try this one? Get the answer before you look!!.625 Don’t forget the decimal