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Grinding Chipped Windows
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 4-54.  Using Thread Chasers
TM 9-254 4-25. Thread Chasers. a. Purpose.  Thread chasers are used to rethread damaged external or internal threads. b. Types  of  Thread  Chasers.    Thread  chasers  (fig.  4-53)  are  threading  tools  that  have  several  teeth.    These tools  are  available  to  chase  threaded  parts  having  standard  threads.    The  internal  thread  chaser  has  its  cutting  teeth located on a side face.  The external thread chaser has its cutting teeth on the end of the shaft. The handle end of the tool shaft tapers to a point. Figure 4-53.  Thread Chasers c. Use of Thread Chasers.  Select the proper thread chaser for the job.  You must know the number of threads per inch on the work.  Simply use a rule to measure  off  a  distance  of  one  inch  and  count  the  number  of  threads  in  the measured distance.  If screw pitch gages are available, use them to determine the number of threads per inch.  Secure the work in a vise or hold the work in one hand.  Hold the chaser in the other hand and run it around the threaded section. Hold the chaser firmly so that the cutting teeth are parallel to the threads in the work as shown in (fig. 4-54).  The cutting action will follow the previously cut threads and restore the damaged portion. d. Care  of  Thread  Chasers.    Never  attempt  to  sharpen  thread  chasers  yourself.    This  is  a  highly  specialized cutting process which involves precision work on hard tool steel of a shape altogether not suited for simple stroking on an oilstone.    Store  chasers  carefully  when  not  in  use.    Coat  with  a  light  film  of  oil  and  store  individually  so  that  the  cutting edges do not touch other metal.  For long periods of storage, coat chasers with a rust-preventive compound and store in a dry place. 4-57

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