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BENDING SHEET METAL
Bending on a Brake

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Figure 13-33.—Stakes and stake plate. formed by shrinking. Such parts are shaped with the aid of hardwood or metal form blocks. These blocks are made in pairs and specifically for the shape of the part being formed. Each pair conforms to the actual dimension and contour of the finished article. You should cut the material to be formed to size, allowing about one-quarter inch of excess material for trim. File and smooth the edges of the material to remove all nicks caused by the cutting tools. This reduces the possibility of the material cracking at the edges during the forming operation. Place the material between the form blocks and clamp it in a vise so that the material will not move or shift. Clamp the work as closely as possible to the particular area Figure 13-34.—Preparation for straight bend by hand. being formed to prevent strain on the form block and to keep the material from slipping. 13-21







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