· How to Read a=
n Inch
Based Micrometer ·
![](3D"ReadMicrometer_files/image001.gif")
Reading an inch-based micrometer by using the four step
addition method explained here is a relatively easy process. The first set =
of
instructions applies to micrometer movements used on outside and inside mic=
rometers.
The second set of instructions applies to depth micrometers.
![](3D"ReadMicrometer_files/image002.gif")
Basic
Micrometer Movement
The illustration above shows a basic micrometer movement as used on outside and inside micrometers. The thimble
rotates relative the barrel on=
a
threaded shaft that has 40 threads per inch. Therefore one complete revolut=
ion
of the thimble moves it axially 1/40th, or .025 inch. The barrel scale is divided into increments of .025 inch, with each
.100 inch numbered for convenience. The thimble
scale is divided into increments of .001 inch, with each .005 inch numb=
ered
around the thimble as 0, 5, 10, 15, and 20.
The following example is presented to illustrate the
four-step addition method. To read the indicated value, proceed as follows:=
![](3D"ReadMicrometer_files/image003.gif")
Step #1. Record the whole numb=
er
that represents the minimum size the micrometer could read. Assume the
illustration above is on a 3 to 4 inch outside or inside micrometer. Write =
it
down as shown here:
3.000
=
Step #2: =
Using
the end of the thimble as an index line, record the whole number of .100 in=
ch
increments to the left of the index line. The illustration above shows that
there are seven .100 inch increments to the left of the index line, which
equals .700 inch. Record this value as shown:
3.000
0.700
Step #3: =
Still
using the end of the thimble as an index line, record the whole number of .=
025
inch increments to the left of the index line. The illustration above shows
that there is one .025 inch increments to the left of the index line, which
equals .025 inch. Record this value as shown:
3.000
0.700
0.025
![](3D"ReadMicrometer_files/image004.gif")
Step #4. Using the axial line =
on the
barrel as the index line read the number of the .001 increment from the thi=
mble
that is closest to the index line. The illustration above shows that there =
the
mark representing sixteen lines up with the index line, which equals .016 i=
nch.
Write it down as shown here:
3.000
0.700
0.025
0.016
Now add up the four digits to obtain the correct readi=
ng:
3.000
0.700
0.025
0.016
3.741
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