How to Read a Metric Micrometer
A micrometer is used to take very precise measurements.
There are different kinds (inside, outside, depth, inch), just look it up on Wikipedia. But here I have a metric one. This one measures to the nearest .01 mm. It says so right here (click the picture for a better view….
You use a micrometer by turning the knurled parts (the “grippy” ones). If a micrometer does not turn freely don’t force it. Look for a lock, it might be locked.
As you turn the knurls, the measuring parts open up. These are called the spindle and the anvil. The spindle moves, the anvil does not. When you tighten down on the thing you are measuring, only use the “clicky” part (ratchet sound) on the very end. This makes the measuring force consistent and it keeps you from ruining your mic. Let’s take a close look at what is called the barrel scale. You will notice there are two sets of marks and a line. The marks above the line are millimeters; the marks below the line are half millimeters.
You read this scale by looking at the edge of the part that turns. This part is called the thimble let’s stop here a minute and be sure you are with me. What do you think the barrel scale is showing in the drawing below?
Go to the next page to see the answer…