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SAFETY RULES FOR WRENCHES - 14310_37
DIAGONAL PLIERS - 14310_39

Aviation Boatswains Mate E - Aviation theories and other practices
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The combination pliers are handy for holding or bending flat or round stock. The long-nosed pliers are less rugged, and break easily if you use them on heavy jobs. Long-nosed pliers, commonly called needle-nose pliers, are especially useful for holding small objects in tight places and for making delicate adjustments. The round-nosed kind are handy when you need to crimp sheet metal or form a loop in a wire. The diagonal cutting pliers, commonly called "diagonals" or "dikes," are designed for cutting wire and cotter pins close to a flat surface and are especially useful in the electronic and electrical fields. The duckbill pliers are used extensively in aviation areas. Here are two important rules for using pliers: 1. Do not make pliers work beyond their capacity. The long-nosed kind is especially delicate. It is easy  to  spring  or  break  them,  or  nick  their edges. After that, they are practically useless. 2. Do  not  use  pliers  to  turn  nuts.  In  just  a  few seconds,  a  pair  of  pliers  can  damage  a  nut. Pliers must not be substituted for wrenches. SLIP-JOINT PLIERS Slip-joint pliers (fig. 1-43) are pliers with straight, serrated  (grooved)  jaws,  and  pivot  where  the  jaws  are fastened together to move to either of two positions to grasp small- or large-sized objects better. Slip-joint  combination  pliers  are  pliers  similar  to the    slip-joint    pliers    just    described    but    with    the additional feature of a side cutter at the junction of the jaws.   This   cutter   consists   of   a   pair   of   square-cut notches, one on each jaw, which act like a pair of shears when  an  object  is  placed  between  them  and  the  jaws closed. WRENCH PLIERS Wrench  pliers  (visegrips)  (fig.  1-44),  can  be  used for  holding  objects  regardless  of  their  shape.  A  screw adjustment in one of the handles makes them suitable for  several  different  sizes.  The  jaws  of  wrench  pliers may  have  standard  serrations  such  as  the  pliers  just described,  or  they  may  have  a  clamp-type  jaw.  The clamp-type jaws are generally wide and smooth and are used primarily when working with sheet metal. Wrench pliers have an advantage over other types of pliers in that you can clamp them on an object and they will stay. This will leave your hands free for other work. A craftsman uses this tool a number of ways. It may be used as a clamp, speed wrench, portable vise, and for many other uses where a locking, plier-type jaw may be used.   These   pliers   can   be   adjusted   to   various   jaw openings by turning the knurled, adjusting screw at the end  of  the  handle  (fig.  1-44).  Wrench  pliers  can  be clamped  and  locked  in  position  by  pulling  the  lever toward the handle. CAUTION Wrench  pliers  should  be  used  with  care, since the teeth in the jaws tend to damage the object on which they are clamped. They should not be used on nuts, bolts, tube fittings, or other objects that must be reused. WATER-PUMP PLIERS Water-pump  pliers  were  originally  designed  for tightening or removing water-pump packing nuts. They were  excellent  for  this  job  because  they  have  a  jaw adjustable  to  seven  different  positions.  Water-pump pliers (fig. 1-45) are easily identified by their size, jaw teeth, and adjustable slip joint. The inner surface of the jaws consists of a series of coarse teeth formed by deep 1-28 Figure 1-43.—Slip-joint pliers. Figure 1-44.—Wrench pliers. Figure 1-45.—Water-pump pliers.







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