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Types and Uses - Continued - 14256_32
Chapter 7 Micrometers

Tools And Their Uses - Hand tools and what they are used for
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TM 9-243 READING A VERNIER CALIPER - Continued Most vernier calipers read “OUTSIDE” on one side and “INSIDE” on the other side. If a scale isn’t marked, and you  want  to  take  an  inside  measurement,  read  the  scale as you would for an outside diameter. Then add the measuring point allowance by referring to manufac- turer’s instructions or the following table. Size  of English Metric Caliper Measure Measure 6 inch or 150 mm Add 0.250 inch Add 6.35 mm 12 inch or 300 mm .300 inch 7.62 mm 24 inch or 600 mm .300 inch 7.62  mm 36 inch or 600 mm .500 inch 12.70  mm READING  A  METRIC  CALIPER The steel rule (1) is divided into centimeters (cm) (2) and the longest lines represent 10 millimeters each. Each millimeter is divided into quarters. The vernier scale (3) is divided into 25 parts and is numbered 0, 5, 10, 15, 20 and 25. Read the total number of millimeters (4) to the left of the vernier zero index (5) and record . . . . . . . . . . . . .32.00 mm Read the number of quarters (6) between the millimeter mark and the zero index and record . . . . . . . . .25 mm = (1 quarter) Read the highest line on the  vernier  scale  (3)  which lines up with the line on the scale (7) and record . . . . . . . . . . . . . . .18  mm TOTAL 32.43 mm CARE OF CALIPERS 1. Store  calipers  in  separate  containers  provided. 2. Keep graduations and markings on all calipers clean and legible. 3. Do not drop any caliper. Small nicks or scratches can cause inaccurate measurements. 4. Protect caliper points from damage. Change  1 6-5/(6-6  blank)







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