1. Reading a Micrometer
Lock Nut

2. Anvil The shiny part that the spindle moves toward, and that the sample rests against.

3. Spindle: The shiny cylindrical part that the thimble causes to move toward the anvil.

4. Ratchet stop: (not shown in illustration) Device on end of handle that limits applied pressure by slipping at a calibrated torque.

5. Frame The C-shaped body that holds the anvil and barrel in constant relation to each other.

6. Lock nut / lock-ring / thimble lock: The knurled part (or lever) that one can tighten to hold the spindle stationary, such as when momentarily holding a measurement.

7. All Micrometers read Similar

8. Number and Line on the Sleeve
.025
.075
.200
.050
.300
.100
.400

9. Numbers and lines on the thimble
Each line on the thimble has a value of .001”
.005”
.001”
.024”

10. What is the reading of the micrometer?

11. Reading to nearest .0001”

13. Different types of Micrometers

14. Some Micrometers Have a bigger opening than others

15. Reading a micrometer takes practice.
The website will give you practice reading a micrometer

16. .549”
.360”
.304”
.023”
.552”