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ADJUSTABLE WRENCHES - 14310_35
SAFETY RULES FOR WRENCHES - 14310_37

Aviation Boatswains Mate E - Aviation theories and other practices
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movable jaw on a pipe wrench is pivoted to permit a gripping action on the work. This tool must be used with discretion, as the jaws are serrated and always make marks on the work unless adequate precautions are observed. The jaws should be adjusted so the bite on the work will be taken at about the center of the jaws. Strap Wrench The strap wrench (fig. 1-39) is used for turning pipe or cylinders where you do not want to mar the surface of  the  work.  To  use  this  wrench,  the  webbed  strap  is placed  around  the  pipe  and  passed  through  the  slot  in the metal body of the wrench. The strap is then pulled up  tight;  and  as  the  mechanic  turns  the  wrench  in  the desired  direction,  the  webbed  strap  tightens  further around the pipe. This gripping action causes the pipe to turn. SPANNER WRENCHES Many special nuts are made with notches cut into their  outer  edge.  For  these  nuts  a  hook  spanner  (fig. 1-40) is required. This wrench has a curved arm with a lug  or  hook  on  the  end.  This  lug  fits  into  one  of  the notches of the nut, and the handle is turned to loosen or tighten the nut. This spanner may be made for just one particular size of notched nut, or it may have a hinged arm to adjust it to a range of sizes. Another  type  of  spanner  is  the  pin  spanner.  Pin spanners have a pin in place of a hook. This pin fits into a hole in the outer part of the nut. Face pin spanners are designed so that the pins fit into holes in the face of the nut (fig. 1-40). When  you  use  a  spanner  wrench,  you  must  make sure the pins, lugs, or hooks make firm contact with the nut  while  the  turning  force  is  transferred  from  the wrench to the nut. If this is not done, damage will result to tools or equipment or injury to personnel. SETSCREW WRENCHES (ALLEN AND BRISTOL) In some places it is desirable to use recessed heads on setscrews and capscrews. One type of screw (Allen) is used extensively on office machines and in machine shops. The other type (Bristol) is used infrequently. Recessed-head  screws  usually  have  a  hex-shaped (six-sided)  recess.  To  remove  or  tighten  this  type  of screw  requires  a  special  wrench  that  will  fit  in  the recess.  This  wrench  is  called  an  Allen-type  wrench. Allen  wrenches  are  made  from  hexagonal  L-shaped 1-26 Figure 1-39.—Strap wrench. Figure 1-40.—General-purpose spanner wrenches.







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