MIL-HDBK-660B
4.4.1 Pines bending machine. Precision metal-forming operations can be done on a Pines Rotary Bending Machine. Smooth bends can be formed to a bend accuracy of ±.5 degree. A complete involved shape can be produced by a series of bends. When a guide is bent, it is thrown into tension on the outside and into compression on the inside. Thickening the inner wall strengthens it; stretching the outer wall weakens it, tending to rupture (see figure 6) the guide. The guide cross section is reduced by the tension and compression. Two types of internal support that may be used in bending are:
a. Form bending. The filler used may be rosin, low melting alloy, nylon, polytetrafluoroethylene, or articulated metal mandrels. The guide is then formed around a radial post.
b. Draw bending. The waveguide is drawn off an interior mandrel, either fixed or flexible, through a form-fitting radius die (see figure 7).
FIGURE 6. Wall distortion of bend.
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