MIL-HDBK-660B
FIGURE 21. Waveguide dies used with Greenlee bender.
d. Bending the waveguide sideways. Bend the waveguide until it has the desired angle and a true radius.
Hammer smooth the puckers in the throat of the bend with a properly shaped hammer. The radius olf the face of the hammer must be as nearly like the radius of the throat as is practically possible.
e. Bending the waveguide edgewise. Bend the waveguide approximately half way to the desired angle until visible distortions appear in the form of puckers in the throat and bulges in the side walls. Hammer smooth the puckers as explained before, and dress the walls by a 3.5 inch (88.9 mm) square-faced blacksmith's flatter with a suitable hammer supplying a proper blow. Another method is to insert the guide in a hand roller and roll the guide through several times with increasing pressure. After all distortion has been removed, remove the filler and re-anneal and refill the waveguide. Bend the waveguide again until it has the desired angle and a true radius. Remove the puckers in the throat as before. The increase in the thickness of the waveguide at the throat is reduced to normal by applying light blows to the flatter while it is being held firmly against the throat area of the side walls. The waveguide can be bent very satisfactorily with rosin to within 5 to 10 percent of the desired bend. This result may be obtained by a properly trained coppersmith using the previously described tools and methods.
4.4.4 Hand bending machine. If none of the previously described methods are available for bending the waveguide, it is possible to design a hand bending machine as shown in figure 22. This type of bending machine requires few parts and it is capable of making satisfactory bends in most cases, provided the operator uses sufficient time and care.
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