General Information
1-24
To read a standard inch micrometer,
perform the following steps and refer to
Figure 27
1. Read the sleeve and find the
largest number.
2. Count the number of lines
between the numbered sleeve
mark and the edge of the thimble.
Each sleeve mark equals 0.025
in.
3. Read the thimble mark that
aligns with the sleeve line. Each
thimble mark equals 0.01 in
4. Add the readings from Steps 1-3.
Telescoping and Small
Bore Gauges
Use telescoping gauges (Figure 28)
and small bore gauges (Figure 29) to
measure bores. Neither gauge has a
scale for direct readings. Use an outside
micrometer to determine the reading.
To use a telescoping gauge, select the
correct size gauge for the bore.
Compress the movable post and,
carefully insert the gauge into the bore.
Carefully move the gauge in the bore to
make sure it is centered. Tighten the
knurled end of the gauge to hold the
movable post in position. Remove the
gauge and measure the length of the
posts. Telescoping gauges are typically
used to measure cylinder bores. To use
a small bore gauge, select the correct
size gauge for the bore. Carefully insert
the gauge into the bore. Tighten the
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