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SCREW AND TAP EXTRACTORS - 14003_26
TACKLE

Aviation Boatswains Mate F - Aviation theories and other practices
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prongs down into the four flutes of the tap. Then slide the bottom collar down to the surface of the work so it will hold the prongs tightly against the body of the extractor. Tighten the tap wrench on the square shank of the extractor and carefully work the extractor back and forth to loosen the tap. It may be necessary to remove the extractor and strike a few sharp blows with a small hammer and pin punch to jar the tap loose. Then reinsert the tap remover and carefully try to back the tap out of the hole. Figure 2-16.—Pipe and tubing cutters. PIPE AND TUBING CUTTERS AND FLARING TOOLS Pipe cutters (fig. 2-16) are used to cut pipe made of steel, brass, copper, wrought iron, and lead. Tube cutters (fig. 2-16) are used to cut tubing made of iron, steel, brass, copper, and aluminum. The essential dif- ference between pipe and tubing is that tubing has considerably thinner walls. Flaring tools (fig. 2-17) are used to make single or double flares in the ends of tubing. Two sizes of hand pipe cutters are generally used in the Navy. The No. 1 pipe cutter has a cutting capacity of 1/8 to 2 inches, and the No. 2 pipe cutter has a cutting capacity of 2 to 4 inches. The pipe cutter has a special alloy-steel cutting wheel and two pres- sure rollers that are adjusted and tightened by turning the handle. Most tube cutters closely resemble pipe cutters, except they are of lighter construction. A hand screw feed tubing cutter of 1/8-inch to 1 1/4-inch capacity has two rollers with cutouts located off center so that cracked flares may be held in them and cut off without waste of tubing. It also has a retractable cutter blade that is adjusted by turning a knob. The other tube cutter shown is designed to cut tubing up to and including 3/4- and 1-inch O.D. Rotation of the trian- gular portion of the tube cutter within the tubing will eliminate any burrs. Flaring tools are used to flare soft copper, brass, or aluminum. The single flaring tool consists of a split Figure 2-17.—Flaring tools. 2-11







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