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SIMPLE CALIPERS
Setting Outside and Inside Spring Calipers

Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices
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Figure 2-11.- Measuring the distance between two surfaces with an inside caliper. Measuring Hard-to-Reach Dimensions To measure an almost inaccessible outside dimension, such as the thickness of the bottom of a cup, use an outside transfer firm-joint caliper as shown in figure 2-12. When the proper “feel” is obtained, tighten the lock joint. Then, loosen the binding nut and open the caliper enough to remove it from the cup. Close the caliper again and tighten the binding nut to seat in the slot at the end of the auxiliary arm. The caliper is now at the original setting, representing the thickness of the bottom of the cup. The caliper setting can now be measured with a rule. To measure a hard-to-reach inside dimension, such as the internal groove shown in figure 2-13, use an inside transfer firm-joint caliper. Use the procedure for measuring a hard-to-reach outside dimension. Measuring Hole Diameters To measure the diameter of a hole with an inside caliper, hold the caliper with one leg in contact with one side of the hole (fig. 2-14) and, as you increase the setting, move the other leg from left to right, and in and out of the hole. When you have found the point of largest diameter, remove the caliper and measure the aliper setting with a rule. A 03 NVSO82 B Figure 2-12.—Mcasuring the thickness of the bottom of a cup. Figure 2-13.-Measuring a hard-to-reach inside dimension with an inside caliper. Figure 2-14.—Measuring an inside diameter with an inside caliper. Setting a Combination Firm-Joint Caliper To set a combination firm-joint caliper with a rule, when the legs are in position for outside measurements, grasp the caliper with both hands as shown in view A of figure 2-15, and adjust both legs to the approximate setting. After you adjust both legs, the shape of the tool will be approximately symmetrical. Thus, it will maintain its balance and be easier to handle. Check this approximate setting as shown in figure 2-15, view B. Sight squarely across the leg at the graduations on the rule to get the exact setting required. Figure 2-15.—Setting a combination firm-joint caliper. 2-6







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