2. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS Reading the Micrometer

3. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS Know the names of the different parts of the Micrometer.

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

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

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

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

8. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS 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.

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

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

11. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS 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

12. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS 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.

13. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS 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

14. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS 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

15. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS 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

16. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS 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

17. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS 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

18. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS 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.

19. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS 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 13..6875

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

21. PHSAUTOMOTIVESALSPHSAUTOMOTIVESALS The End