Reading a Micrometer Lock Nut

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

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

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

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

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.

All Micrometers read Similar

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

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

What is the reading of the micrometer?

Reading to nearest .0001”

Different types of Micrometers

Some Micrometers Have a bigger opening than others

Reading a micrometer takes practice. The website will give you practice reading a micrometer http://www.linnbenton.edu/auto/day/mike/read.html

.549” .360” .304” .023” .552”