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USING CALIPERS
Setting Outside and Inside Spring Calipers

Aviation Boatswains Mate E - Aviation theories and other practices
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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 caliper setting with a rule. 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. 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. 2-6 Figure 2-12.—Measuring 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. Figure 2-15.—Setting a combination firm-joint caliper. Figure 2-16.—Decreasing and increasing the setting of a firm-joint caliper.







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