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Peening.
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Example of Typical Swaging Job
TM 9-254 3-5. Peening - Continued b. Preparation for Peening.  Most of the preparation for a peening job consists of an analysis of where to do the striking.    The  spherical  indentations  caused  by  the  use  of  a  ball  peen  hammer  cause  the  metal  to  spread.    Thus,  the selection of the proper tool is an important factor in preparation.  The part to be peened must always be backed up with the proper tool or holding device c. Procedure.    For  example,  suppose  that  the  handle  of  a  carrying  case  has  become  loose.    It  is  decided  to tighten this handle by peening the rivets which secure it to the case.  Figure 3-10 illustrates the use of an anvil placed on the under side of the handle to back up the rivets, and the blows being struck on a rivet with the peen of the hammer.  The blows must be so directed as to cause the metal of the rivet to flow, tightening the assembly, the blows should be light and the metal must flow slowly and smoothly. Figure 3-10.  Peening a Rivet 3-6. Swaging. a. General.  Swaging is a process used to move metal when a series of hammer blows (peening) is difficult to control or where a smooth resulting surface is required.  Swaging is performed by successive blows on dies, called swage blocks, which are shaped in such a manner as to give a required form.  For instance, if a flat square form is desired, the swage blocks would be two pieces of flat stock.  Curved forms will require curved blocks b. Preparation for Swaging.  Much of the preparation is in the analysis of the job, as in peening.  The principal question is where to exert the force to do the most good.  Selecting the swage blocks is also primarily important.  In some cases these blocks will require machining to accurately meet a required dimension. 3-9

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