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Preparation for Peening
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 3-12.  Swaging
TM 9-254 3-6. Swaging - Continued c. Example of Typical Swaging Job.  For example, suppose that, in the aiming circle M1, the bearing surface for the right trunnion of the telescope has become worn, resulting in a loose fit.  To overcome this condition, a pair of swage blocks must be made which will assist in reducing the size of the hole.  The analysis of this particular condition is illustrated in figures 3-11, 3-12, and 3-13.  The important feature of these swage blocks is the diameter of the pilot on the lower block that must fit the bearing surface.  It must be of exactly the same diameter as the right trunnion of the telescope.  As the blows are struck on the blocks, turn the body of the aiming circle around at different points so that an even pressure on the metal  will  be  obtained.    This  particular  job  will  not  require  many  blows  since  the  material  is  brass  and  very  thin.    If  the material was heavier and difficulty was encountered in reducing the size of the hole, the upper block could have a raised portion, as illustrated in figure 3-13.  The raised portion tends to localize the blows and increase the flow of the metal.  A block of this type may be used only when the surface contacted does not have to be flat. Figure 3-11.  Swage Blocks Prepared for Use d. Precautions.    When  properly  practiced,  swaging  will  move  the  metal  throughout  its  entire  thickness.    If  the blows  are  struck  lightly,  only  the  surface  of  the  metal  will  move  and  the  piece  will  soon  return  to  its  undesired  shape. Therefore,  make  sure  that  the  metal  is  moved  throughout  its  entire  thickness.    After  the  blocks  have  been  used,  they should be cleaned, a light coat of oil applied to them, and then they should be stored in a dry place. 3-10

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