Quantcast Reading a Metric Micrometer

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TM 9-243 READING  A  METRIC  MICROMETER The same principle is applied in reading the metric graduated micrometer, but the following changes in graduations are used: The pitch of the micrometer screw is 0.05 mm. One revolution of the spindle advances or withdraws the screw a distance equal to 0.5 mm. The  barrel  (1)  is  graduated  in  millimeters  from  0  to  25.  It takes two revolutions of the spindle to move the barrel 1  mm. The thimble (2) is graduated in 50 divisions with every fifth line being numbered. Rotating the thimble from one graduation to the next moves the spindle 1/50 of 0.5 mm, or 1/100 mm. Two graduations equal 2/100 mm, and so forth. CARE  OF  MICROMETERS TO READ MEASUREMENT AS SHOWN ABOVE: Read highest figure visible on barrel (1) . . . . . . . . . . . . . . 20 = 20.0 mm Number of lines visible between the No. 20 and thimble edge (2) . . . . . . . . . . . . . . . . . . .2 = 2.0 mm The line on the thimble that coincides with or has passed the revolution or long line in the barrel (3) . . . . . . . . . . . 36=36/100 (.36) mm NOTE Remember that 1 revolution is 0.5 mm. It takes 2 revolutions to move 1 mm. Measurement reading . . . . . . . . . . . TOTAL 22.36 mm 1. Coat  metal  parts  of  all  micrometers  with  a  light  coat 3. Keep graduations and markings on all micrometers of oil to prevent rust. clean and legible. 2. Store   micrometers   in   separate   containers   provided 4. Do not drop any micrometer. Small nicks or by    manufacturer. scratchescan  cause  inaccurate  measurements. 7-6



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