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READING THE VERNIER SCALE ON A MICROMETER - 14310_68
SELECTING THE PROPER MICROMETER

Aviation Boatswains Mate E - Aviation theories and other practices
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Reading a depth micrometer. When reading a depth micrometer, you will notice that the graduations on the sleeve are numbered in the opposite direction of those on an outside or inside micrometer. When you are reading a depth micrometer, the distance to be measured is the value that is covered by the thimble. See figure 2-30; consider the reading shown. The thimble edge is between the numbers 4 and 5. This shows a value of at least 0.400 inch on the sleeve's major divisions. The thimble also covers the first minor division on the sleeve; this has a value of 0.025 inch. The value shown on the thimble circumference scale is 0.010 inch. Adding these three values together results in a total of 0.435 inch, or the total distance that the end of the extension rod has traveled from the base. This measurement added to the length of the extension rod used gives you the total depth of the hole, recess, or groove that was measured. 2-11 Figure 2-28.—Inside micrometer set. Figure 2-29.—Using a depth micrometer. Figure 2-30.—Depth micrometer sleeve and thimble scales.







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