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Table 4-1.2.  Torque Value Guide - Newton-Meters
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 4-8.  Micrometer Barrel
TM 9-254 4-2. Use of Gages. a. General.    This  section  contains  general  information  about  micrometers  and  feeler  gages.    A  more  detailed explanation concerning use and operation of these and other types of gages is contained in TM 9-243, Use and Care of Handtools and Measuring Tools. b. Micrometer (fig. 4-7). Micrometers are used for measurements requiring precise accuracy.  The micrometer screw (3) has a pitch of 40 threads to the inch; in other words, if a screw is turned  forty  times,  it  moves  the  spindle  (2) exactly  1  inch  either  towards  or  away  from  the  anvil  (1).    A  clockwise  turn  moves  the  spindle  toward  the  anvil.    A counterclockwise turn moves the spindle away from the anvil or opens the micrometer. (1) The revolution line along the barrel (10) illustrated in (fig. 4-8), is 1 inch long and is divided into ten equal parts, indicated by numbered graduations.  The unnumbered graduations in turn divide each numbered graduation into four equal parts. (2) Assume   that   the   thimble   is   turned   counterclockwise   from   completely   closed   position   until   the   first numbered  graduation  is  reached.    The  thimble  will  have  turned  four  full  revolutions  and  moved  a distance of 0.100 inch (1/10 inch).  Each unnumbered graduation is 0.025 of an inch along the revolution line.  Each complete revolution of the thimble moves it this distance. KEY to figure 4-7: 1. Anvil 7. Adjustment nut 2. Spindle 8. Slotted nut 3. Micrometer screw 9. Thimble 4. Thimble sleeve 10. Barrel 5. Thimble cap 11. Clamp ring 6. Ratchet stop 12. Frame Figure 4-7.  Micrometer Caliper - Cutaway View 4-7

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