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Method of Filing
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 4-51.  Removing Burrs From a Flat Surface
TM 9-254 4-22. Files - Continued (3) When filing hard metals, apply pressure on the forward stroke only.    The  file  should  be  lifted  from  the work on the return stroke to prevent the teeth from becoming dull.  When filing soft metals, pressure on the forward and return stroke will help keep the cuts in the file clean of waste metal and will not dull the teeth. (4) Use a rocking motion when filing round surfaces. ( (5) When using a new file, too much pressure or force may cause the teeth to break off.  File slowly, lightly, and  steadily.    Too  much  speed  and  too  much  pressure  causes  the  file  to  rock  and  will  round  off  the corners of the work. 4-23. Removing Nicks and Burrs. a. General.  Burrs are thin edges or rough spots left on metal surfaces and are common on outside and inside screw threads.  Nicks are small grooves or cuts in the metal surface and can form either ridges, uneven surfaces or burrs. b. Nick and Burr Removal.  The following are suggested ways of removing nicks and burrs: (1) To remove burrs from straight edge, hold a flat file at an angle to the edge as shown in figure 4-49, and move the file back and forth along the edge until the edge is smooth and even. Figure 4-49.  Using a Flat File. 4-54

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