GENERAL INFORMATION
31
Anvil
32
5.00 mm
0.50 mm
0.18 mm
5.68 mm
1. Read the upper half of the sleeve line and count
the number of lines visible. Each upper line equals 1
mm.
2. See if the half-millimeter line is visible on the
lower sleeve line. If so, add 0.50 to the reading in
Step 1.
3. Read the thimble mark that aligns with the
sleeve line. Each thimble mark equals 0.01 mm.
NOTE
If a thimble mark does not align ex
actly with the sleeve line, estimate the
amount between the lines. For accu
rate readings to two thousandths of a
millimeter (0.002 mm), use a metric
vernier micrometer.
4. Add the readings from Steps 1-3.
STANDARD METRIC MICROMETER
Locknut Sleeve line Thimble
Spindle
Sleeve
marks
Adjustment
Before using a micrometer, check its adjustment
as follows:
1. Clean the anvil and spindle faces.
2A. To check a 0-1 in. or 0-25 mm micrometer:
a. Turn the thimble until the spindle contacts the
b. The adjustment is correct if the 0 mark on the
c. Follow the manufacturer's instructions to ad-
2B. To check a micrometer larger than 1 in. or 25
mm, use the standard gauge supplied by the manu-
facturer. A standard gauge is a steel block, disc or
rod that is machined to an exact size.
a. Place the standard gauge between the spindle
b. The adjustment is correct if the 0 mark on the
c. Follow the manufacturer's instructions to ad-
Rachet
Thimble
marks
anvil. If the micrometer has a ratchet stop, use
it to ensure the proper amount of pressure is
applied.
thimble aligns exactly with the 0 mark on the
sleeve line. If the marks do not align, the mi-
crometer is out of adjustment.
just the micrometer.
and anvil, and measure its outside diameter or
length. If the micrometer has a ratchet stop,
use it to ensure the proper amount of pressure
is applied.
thimble aligns exactly with the 0 mark on the
sleeve line. If the marks do not align, the mi-
crometer is out of adjustment.
just the micrometer.
17
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