MIL-HDBK-660 Fabrication Of Rigid Waveguide Assemblies Sweep Bends And TwistsThis handbook is intended for the electronic installations technician to be used as a guide for fabricating rectangular waveguide bends and twists used in the microwave region of the electronic spectrum.

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MIL-HDBK-660B

FIGURE 22.  Waveguide hand bending tool.

4.4.5  Bench vise.  A waveguide of small dimensions may be formed in a bench vise.

4.5  Twisting the waveguide.  The twisting of the waveguide is accomplished by the use of equipment having the essential features as shown in figures 23 through 27.  The method of twisting is as follows:

a.    Anneal the waveguide along the portion of the length where the twist is to be made.

b.    Plug the waveguide section at one end, fill it, allow it to cool, and then level it off at the top.

c.    Insert the waveguide in the equipment as shown in figure 23 and twist it to the desired degree.

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