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Q31. List the safety precautions that apply to power tools. Q32. List   the   safety   precautions   that   apply   to extension cords. PORTABLE PNEUMATIC POWER TOOLS LEARNING   OBJECTIVES: Identify dif- ferent types of portable pneumatic power tools. Describe the uses of different types of portable pneumatic power tools. List the safety precautions that apply to portable pneumatic power tools. Portable pneumatic power tools are tools that look much  the  same  as  electric  power  tools  but  use  the energy of compressed air instead of electricity. Because of  the  limited  outlets  for  compressed  air  aboard  ship and shore stations, the use of pneumatic power tools is not as widespread as electric tools. Portable pneumatic tools  are  used  most  around  a  shop  where  compressed air outlets are readily accessible. PNEUMATIC CHIPPING HAMMER The    pneumatic    chipping    hammer    (fig.    1-64) consists basically of a steel piston that is reciprocated (moved  backward  and  forward  alternately)  in  a  steel barrel  by  compressed  air.  On  its  forward  stroke  the piston strikes the end of the chisel, which is a sliding fit in a nozzle pressed into the barrel. The rearward stroke is    cushioned    by    compressed    air    to    prevent    any metal-to-metal  contact.  Reciprocation  of  the  piston  is automatically controlled by a valve located on the rear end of the barrel. Located on the rear end of the barrel is a grip handle, containing a throttle valve. The pneumatic hammer may be used for beveling; caulking  or  beading  operations;  and  for  drilling  in brick, concrete, and other masonry. Chipping hammers should not be operated without safety goggles, and all other persons in the immediate vicinity of the work should wear goggles. While  working,  never  point  the  chipping  hammer in such a direction that other personnel might be struck by  an  accidentally  ejected  tool.  When  chipping  alloy steel or doing other heavy work, it is helpful to dip the tool in engine lubricating oil about every 6 inches of the cut and make sure the cutting edge of the tool is sharp and clean. This will allow faster and easier cutting and will reduce the possibility of the tool breaking. When  nearing  the  end  of  a  cut,  ease  off  on  the throttle lever to reduce the intensity of the blows. This will avoid any possibility of the chip or tool flying. If  for  any  reason  you  have  to  lay  the  chipping hammer down, always remove the attachment tool from the nozzle. Should the chipping hammer be accidentally  started  when  the  tool  is  free,  the  blow  of the piston will drive the tool out of the nozzle with great force and may damage equipment or injure personnel. ROTARY AND NEEDLE IMPACT SCALERS Rotary and needle scalers (figs. 1-65 and 1-66) are used to remove rust, scale, and old paint from metallic and masonry surfaces. You must be especially careful when   using   these   tools   since   they   will   "chew"   up anything in their path. Avoid getting the power line or any part of your body in their way. The  rotary  scaling  and  chipping  tool,  sometimes called a "jitterbug," has a bundle of cutters or chippers for  scaling  or  chipping  (fig.  1-65).  In  use,  the  tool  is pushed along the surface to be scaled, and the rotating chippers do the work. Replacement bundles of cutters are available when the old ones are worn. 1-40 Figure 1-64.—Pneumatic chipping hammer. Figure 1-65.—Rotary impact scaler.

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