Quantcast Figure 3-21.  End Play in Wormshaft

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Figure 3-19.  Handwheel Rubbing on Housing
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TM-9-254 Gearcase Transfer M548 M548A1 (
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TM 9-254 3-7. Worm and Worm Gear Mechanisms - Continued (4) End play.  End play is the term applied to lengthwise movement of a shaft (fig. 3-21).  Such movement, in  a  moderate  degree,  is  acceptable  when  it  does  not  contribute  to  the  total  backlash.    Shafts  are normally restricted longitudinally by shoulders, collars, thrust bearings, ball  caps,  and  sockets,  or  by  a combination  of  these.    Seats,  sockets,  and  wormshaft  balls  are  commonly  used  for  this  purpose  in military instruments, the wormshaft ball being held between the seat and the socket.  If the ball cap is loose  and  the  ball  socket  does  not  bear  firmly  and  uniformly  upon  the  ball,  end  play  in  the  shaft  will result.    As  the  wormshaft  is  rotated,  the  slack  between  the  ball  and  seat  or  socket  must  be  taken  up before the shaft will cause the worm gear to rotate. Figure 3-21.  End Play in Wormshaft (5) Side play.  Side play is the looseness or lateral movement,  which  is  found  in  improperly  fitted  or  worn bearing  parts,  such  as  the  male  and  female  conical  bearing  surfaces.    Such  movement  should  be reduced to  an  absolute  minimum  since  it  affects  not  only  total  backlash  but  also  the  proper  setting  of level vials attached to the instrument. (6) Backlash due to binding.  This form of backlash occurs in screw type adjustments which depend upon steady spring pressure or retaining rings to eliminate lost motion or slack. (7) Reduction of backlash (fig. 3-15).  On worm and worm gear mechanisms, backlash may be reduced by tightening the socket against the wormshaft ball.  Backlash may sometimes be reduced by replacing the plunger spring.  In cases of emergency only, the spring may be shimmed.  Backlash may be eliminated by  removing  irregularities  from  the  plunger  which  might  prevent  its  movement  or  by  filing  away,  or relieving, the shaft housing if the shaft bears against it.  Bottoming of the worm may be eliminated by turning off a small amount of metal from the worm, worm gear, or both. 3-18

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