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Cutting Sheet Metal with Snips - 14001_23
Using Hacksaws

Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices
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work. If the blades are not at right angles to the surface of the work, the edges of the cut will be slightly bent and burred. The bench edge will also act as a guide when you are cutting with the snips. The snips will force the scrap metal down so that it does not interfere with cutting. Any of the hand snips may be used for straight cuts. When notches are too narrow to be cut out with a pair of snips, make the side cuts with the snips and cut the base of the notch with a cold chisel. Safety and Care Learn to use snips properly. They should always be oiled and adjusted to permit ease of cutting and to produce a surface that is free from burrs. If the blades bind or if they are too far spat, the snips should be adjusted. Remember the following safety tips: Never use snips as screwdrivers, hammers, or pry bars. They break easily. Do not attempt to cut heavier materials than the snips are designed for. Never use tin snips to cut hardened steel wire or other similar objects. Such use will dent or nick the cutting edges of the blades. Never toss snips in a toolbox where the cutting edges can come into contact with other tools. This dulls the cutting edges and may even break the blades. When snips are not in use, hang them on hooks or lay them on an uncrowded shelf or bench. HACKSAWS Hacksaws are used to cut metal that is too heavy for snips or boltcutters. Thus metal bar stock can be cut readily with hacksaws. There are two parts to a hacksaw: the frame and the blade. Common hacksaws have either an adjustable or a solid frame (fig. 1-21). Most hacksaws found in the Navy are of the adjustable-frame type. Adjustable frames can be made to hold blades from 8 to 16 inches long, while those with solid frames take only the length blade for which they are made. This length is the distance between the two pins that hold the blade in place. Figure 1-21.-Hacksaws. Hacksaw blades are made of high-grade tool steel, hardened and tempered. There are two types, the all-hard and the flexible. All-hard blades are hardened throughout, whereas only the teeth of the flexible blades are hardened. Hacksaw blades are about 1/2-inch wide, have from 14 to 32 teeth per inch, and are from 8 to 16 inches long. The blades have a hole at each end, which hooks to a pin in the frame. All hacksaw frames, which hold the blades either parallel or at right angles to the frame, are provided with a wingnut or screw to permit tightening or removing the blade. The SET in a saw refers to how much the teeth are pushed out in opposite directions from the sides of the blade. The four different kinds of set are the ALTERNATE set, DOUBLE ALTERNATE set, RAKER set, and WAVE set. Three of these are shown in figure 1-22. The teeth in the alternate set are staggered, one to the left and one to the right throughout the length of the blade. On the double alternate set blade, two ajoining teeth are staggered to the right, two to the Figure 1-22.-“Set” of hacksaw-blade teeth. 1-14







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