MIL-DTL-23351B
3.3.2 Length. The finished waveguide shall be furnished in nominal straight lengths with ends, or in specific
straight lengths without ends (see 6.2). For waveguides ordered with ends, the nominal length shall be as specified
(see 3.1), and the shortest permissible length of the ends shall be 60 percent of the nominal length. The maximum
permissible weight of ends shall not exceed 25 percent of the lot weight. For waveguides ordered in specific lengths,
the length shall be as specified (see 3.1). Waveguides ordered with or without ends shall conform to the tolerances
in table I.
TABLE I. Waveguide tolerances.
Length
Tolerance
(all plus)
Stock lengths (with ends)
1
Specific lengths
Up to 14 feet, inclusive
1/4
Over 14 feet
1/2
3.4 Bow. When measured as specified in 4.6.2, the bow between any two points 2 feet apart on the concave
external surface of the waveugide shall not be more than .010 inch on the narrow surface (E-plane) and .020 inch on
the wide surface (H-plane), unless otherwise specified (see 3.1). If the waveguide is less than 2 feet long, the
allowable bow shall be proportionate to the above requirements.
3.5 Twist. When waveguides are measured as specified in 4.6.3, the maximum twist along the longitudinal axis
shall not exceed 1 degree per foot of length on the face of the interior or exterior surfaces.
3.6 Squareness of cut. When measured as specified in 4.6.4, the departure from square of the end of any
waveguide shall not exceed 0.010 inch for waveguides up to .625 inch maximum inside waveguide dimension,
inclusive, and 0.016 inch-per-inch (one degree) for waveguides over .625 inch maximum inside waveguide
dimension.
3.7 Surface roughness. When measured as specified in 4.6.5, the interior surface roughness of the waveguide
shall not exceed the values shown in table II.
TABLE II. Surface roughness tolerances of waveguides.
Allowable surface roughness,
Specified major inner
maximum arithmetic average (AA)
dimension (inches)
Aluminum and
Copper, copper alloy,
and silver alloy
aluminum alloy
Up to 4, exclusive
63
32
4 and over
125
63
3.8 Scratches. When measured as specified in 4.6.6, scratches shall not be more than 0.001 inch deep in the
longitudinal direction for waveguides with internal width dimensions of .625 inch or larger. For waveguides with
internal width dimensions of less than .625 inch, the depth of scratches shall not exceed .12 percent of the width.
3.9 Marking. Each length of waveguide shall be marked in accordance with method I of MIL-STD-1285, with the
part number (see 3.1) and the manufacturer's source code. The manufacturer's name or trademark may also be
marked on the waveguide, provided such letters are not expressly forbidden in the contract, and their height does not
exceed 50 percent of the outside dimension of the waveguide. The markings shall be applied with a permanent ink or
paint. Not more than 6-inch intervals shall be permitted from the end of one marking to the beginning of the next
marking.
3.10 Workmanship. The waveguide shall be free from defects of a nature that may interfere with normal military
applications. The waveguide shall be uniform in composition and wall thickness, straight and smooth from end to
end, and shall be free from internal and external mechanical imperfections, and shall have a clean, bright appearance
in accordance with good commercial practice. In addition, the interior surface of the waveguide shall be free from
burrs, die marks, chatter marks, dirt, grease, scales, and splinters.
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