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|  MIL-S-3644R
3.2 Component parts.
The tuning shaft shall consist of the following
parts:
Quantity
Item
Item name
1
1
Casing, of the length specified (see 6.2)
2
1
Shafting, of the length specified (see 6.2)
3
2
Sleeve
4
2
Coupling nut
5
2
Spline assemblies
6
1
Tag
3.3 Material. The material for each part shall be as specified herein.
When a definite material is not specified, a suitable material shall be used.
Acceptance or l pproval of any constituent material shall not be construed as a
guaranty of the acceptance of the finished product.
3.3.1 Aluminum alloy.
3.3.1.1 Bars and rods. When aluminum-alloy bars or rods are used, the
alloy shall conform to QQ-A-225/5.
3.3.1.2 Sheet.
When aluminum alloy sheet is used, the alloy shall conform
to QQ-A-250/1.
3.3.2 Brass.
When brass is used, it shall conform to QQ-B-626.
3.4 Design and construction. The tuning shaft shall conform to the design
construction, and physical dimensions shown on figure 1.
3.4.1 Interchangeability. Mechanical interchangeability shall exist
between like assemblies, subassemblies, and replaceable parts, regardless of
the manufacturer or supplier. Interchangeability for purposes of this para-
graph does not mean identity, but requires that a substitution of such like
assemblies, subassemblies , and replaceable parts be easily affected without
physical modification of any part of the assemblies, including mounting, and
without resort to selection.
3.4.2 Casing. The casing shall be of the interlocked type and shall be
made from steel strip with asbestos packing. The strip and packing shall be
wound together in a spiral so that the strip forms a continuous overlapping
joint, the asbestos lying within the joint and being held by crimping the steel
strip. The outside diameter of the finished casing shall be 0.335 inch maxi-
mum. The inside diameter shall be 0.245 inch minimum.
*
3.4.2.1 Steel strip. The steel strip shall be not less than 0.010 inch
thick and 0.225 +0.015 inch wide, and shall be zinc-plated in accordance with
ASTM B 633. -
The asbestos packing shall be 3-ply, 10-cut, or
3.4.2.2 Asbestos packing.
equal.
3
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