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Measuring Hole Diameters | Up
Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices | Next
TYPES OF MICROMETER CALIPERS |
Figure 2-16.—Decreasing and increasing the setting of a
firm-joint caliper.
Figure 2-18.—8etting an outside spring caliper.
Figure 2-17.—Setting a combination firm-joint caliper for
inside measurements.
If it is necessary to decrease or increase the setting,
tap one leg of the caliper as shown in figure 2-16. The
arrow indicates the change in setting that will take
place.
When the caliper is set for inside measurements, the
same directions for adjusting the setting apply. Figure
2-17 shows how the end of the rule and one leg of the
caliper are rested on the bench top so that they are
exactly even with each other when the reading is taken.
Setting Outside and Inside
Spring Calipers
To set a particular reading on an outside spring
caliper, first open the caliper to the approximate setting.
Then, as shown in figure 2-18, place one leg over the
end of the rule, steadying it with the index finger. Make
the final setting by sighting over the other leg of the
caliper squarely with the face of the rule at the reading,
and turning the knurled adjusting nut until the desired
setting is obtained.
To set an inside spring caliper to a particular
reading, place both caliper and rule on a flat surface as
shown in figure 2-19. The rule must be held squarely or
Figure 2-19.—Setting an inside spring caliper.
normal (90° in both directions) to the surface to ensure
accuracy. Adjust the knurled adjusting nut, reading the
setting on the rule with line-of-sight normal to the face
of the rule at the reading.
Transferring Measurements from
One Caliper to Another
To transfer a measurement from one spring caliper
to another, hold the calipers as shown in figure 2-20.
Note that one of the man’s fingers is extended to steady
Figure 2-20.—Transferring a measurement from an outside
to an Wide caliper.
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