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

TABLE II. Surface roughness tolerances of waveguides.

Specified major inner dimensions (inches)

Allowable surface roughness, maximum arithmetic average (A. A.)

Aluminum, aluminum alloy, and magnesium alloy

Copper, copper alloy, silver alloy, silver lined copper, and silver lined copper alloy

Up to 4, exclusive - - - - - - - - - -

4 and over - - - - - - - - - - - - - - -

125

The flatness and surface finish on the flange surfaces at and near the junction with the interior of the waveguide wall should be the following:

a. The flatness should not deviate more than .002 inches per inch. b. Surface finish should be as specified in table II.

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1 Intended use. This 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

6.2 Subject term (key word) listing.

Annealing

Brazing Mandrel Polytetrafluoroethylene Rosin Method

6.3 Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes.