PRECISION MEASURING AND GAGING - OD1642 - LESSON 1/TASK 2
c The line of the thimble that
coincides with or has passed
the revolution or long line
in the barrel (7) ................. 16 = 0.016 in.
TOTAL _____________
= 0.241 in.
(b) Reading a Vernier Micrometer.
1 Reading the vernier micrometer (figure 38) is the same as
reading the standard micrometer, except that an additional step must be
taken, which is to add the vernier reading to the regular dimensions. This
allows for precise measurements which are accurate to ten-thousandths
(0.0001) of an inch.
This scale furnishes the fine readings between the
lines on the thimble rather than making an estimate as one would make on a
standard micrometer.
FIGURE 38.
READING A VERNIER MICROMETER.
2 There are ten spaces on the vernier micrometer, (figure 38,
view A, (1)). Therefore, each unit on the vernier scale is equal to 0.0009
of an inch, and the difference between the sizes of the units on each scale
is 0.0001 of an inch.
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