MIL-DTL-23351B
4.6 Methods of inspection.
4.6.1 Visual and mechanical examination. Waveguides shall be examined to verify that the materials, design,
construction, physical dimensions, finish, length, marking, and workmanship are in accordance with the applicable
requirements (see 3.2 through 3.3.2, 3.9 and 3.10).
4.6.1.1 Dimensions. Waveguides with 1-inch major outside dimension and over shall be measured at a point at
least 1 inch from the end; waveguides with less than 1-inch major outside dimension shall be measured at least 1/2
inch from the end to ascertain that all dimensions are as specified (see 3.1) and that the waveguide is of the specified
length (see 3.1). Eccentricity may be measured at any point around the periphery. For the purpose of determining
conformance with the dimensional requirements prescribed herein, any measured value outside the specified limiting
values for any dimension shall be construed as failing to meet specification requirements.
4.6.2 Bow (see 3.4). Bow is the departure from a straight longitudinal line connecting any two points 2 feet apart
on the external surface of the waveguide without the effect of gravity or any other forces. The waveguide shall be so
positioned during measurement that gravity will not tend to increase or decrease the amount of bow. Measurements
shall be made along any 2-foot portion of the total length.
4.6.3 Twist (see 3.5). The angle of twist of waveguides shall be measured as shown on figure 1 and as follows:
a. The waveguide shall be placed on a flat, horizontal, reference plane. Waveguides with noticeable, flatwise,
bow shall be positioned with the waveguide surface on the side of the convex curvature in contact with the
reference plane.
b. One end of the waveguide surface shall be held in intimate contact with the reference plane by suitable
means while the other end of the waveguide remains free.
c. Using an engraved, transparent, protractor segment, determine the angle line on the protractor which
coincides to the nearest degree with the surface of the waveguide, while one edge of the protractor segment
contacts, or is kept parallel to the reference plane by means of parallel face blocks.
4.6.4 Squareness of cut (see 3.6). The squareness of the cut of the waveguide shall be measured using an
adjustable protractor.
4.6.5 Surface roughness (see 3.7). The average interior surface roughness of the waveguide shall be measured
in accordance with ASME-B46.1, except flaws shall be included in the surface roughness measurement and the
corner radius shall not be included in the measurement. Surface roughness shall be measured across the grain over
the full width of the waveguide interior surface, at the center of the waveguide length and 6 inches from the end of the
length, unless otherwise specified (see 3.1 and 6.2).
4.6.6 Scratches (see 3.8). Inspection for scratches shall be 6 inches from each end and at the center of the
waveguide.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When actual packaging of materiel is to be performed by DoD personnel, these personnel need to contact
the responsible packaging activity to ascertain requisite packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activity within the Military Department or Defense Agency, or
within the Military Department's System Command. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
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