Micrometer how to read it.

Did you get an instruciton sheet with the tools?

Check out this link for some assistance. The first part is in text that's too large, but the pictures at the bottom of the page are excellent.

• Reading a Micrometer

The scale is read first and is measured in tenths of an inch. The fine knob is then hundreths of a tenth (or, looking at it another way, the two readings together are thousandths of the total).

I don't see how you figured that out so darned fast! Took me a lifetime to learn how to read one of those rascals. :>(

Allan

Use a piece of 1/4" tubing or rod and use your
0-1 inch mike to measure it. Should read .250". Hal

The scale under the knob that goes from 0 to 0 (10) is the number in the first decimal place (the 1 in 0.100). Each of those 10 increments should be divided into four parts, (you mentioned only two) each being one fourth of 0.100 or .025. Each of the 25 marks is actually 0.001 on the knob.

That being said, on the 3 inch micrometer 2.373 would read with the knob past the 3 (0.300) two full revolutions (.050) of the knob plus another 23 on the rotating knob (0.300+ 0.050 + 0.023=0.373).

Hope I explained this good enough.

One complete rotation of the knob is .025" (25 thousandths). There should be 4 lines on the indicator scale also each line is 0.025". For a 2-3" mic, 0 is 2" to start. Rotate the knob one turn, starting at 0, and you have 2.025", 2 turns is 2.050". If you get to 1 on the scale then it's 2.100"

When measuring, the size will be the indicator reading along with some .001" added to the number based on where the knob is turned.
For example, you measure a part with a 2-3" mic and the scale on the mic is above line 5 and one smaller line after 5. So far we have 2.500" + .025" for the small line too = 2.525". The line on the knob is at 20 and lines up with the mic scale. Now you need to add .020" to 2.525 and you get 2.545". Some mics have a .0001" scale too. If your mic does, look for lines marked 0 1 2 3 4 5 6 7 8 9 0. Whichever line lines up with any line on the knob scale is the correct number. If the 7 line is the best match then the final reading is 2.5457". I hope this helps.

Larry

scotty