Quantcast Figure 4-8.  Micrometer Barrel

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Use of Gages
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 4-10.  Micrometer Barrel Setting - .300 inch
TM 9-254 4-2. Use of Gages - Continued Figure 4-8.  Micrometer Barrel (3) The  graduations  on  the  thimble  illustrated  below,  (fig.  4-9),  further  divide  the  indications  into  single thousandths  of  an  inch  by  indicating  each  twenty-fifth  of  a  revolution  of  the  thimble.    Therefore  one twenty-fifth  of  a  revolution  of  the  thimble  opens  or  closes  the  micrometer  0.001  inch  (1/1000  inch). When  the  micrometer  is  in  the  fully  closed  position,  the  edge  of  the  thimble  coincides  with  0  on  the barrel, and 0 on the thimble coincides with the revolution line.  Each time a graduation on the thimble passes the revolution line on the barrel, the micrometer opens 0.001 inch. Figure 4-9.  Graduated End of Thimble 4-8

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