MIL-DTL-14852D (AR)
4.4.1.2.3 Rotating band (gilding metal). The samples
provided by 4.4.1.2.3.1 shall have the rotating band removed and
carefully flattened without hammering so as to hold to a minimum
any additional cold working. The specimen blank shall be machined
so that all serration marks from the band seat are removed. A
largest possible test specimen shall be removed from the blank.
However, the test specimen size shall be no less than one inch
gage length and a one-half inch gage width. The grip ends of the
test specimen shall be of sufficient length to accommodate the
tensile machine and tested in accordance with the procedures
prescribed by ASTM E8/E8M.
4.4.1.2.3.1 Rotating band sample size. The sample rotating
band for testing in accordance with 4.4.1.2.3 for compliance with
3.3.1 shall be provided as part of the sample taken from 4.4.3.3.
The sample size, frequency and rejection criteria are the same as
that described in 4.4.3.3.
4.4.2 Macro etch (base plug). One base plug from each
standard heat treatment lot and one from each miscellaneous heat
treatment lot shall be subjected to a Macro Etch test. The base
plug shall be sectioned through its diameter and one of the
sectioned surfaces prepared by grinding the surface to a flat.
This part shall then be immersed in a macro etch solution of 50
percent hydrochloric acid and 50 percent water and heated to a
temperature of 180 degrees F, minimum. The base part shall remain
in the macro etch solution until flow lines become clearly
visible. The part shall then be rinsed with water, dried and
visually examined for compliance with Dwg. 10534903.
4.4.3 Band seating.
4.4.3.1 Clearance nondestructive method. The samples shall
be tested for requirements in 3.4 utilizing the equipment and
procedures prescribed Drawing 9280429. Five body assemblies from
each 1-hour production per banding machine in operation shall be
subjected to this test. Failure of one or more bands shall be
cause for rejection of the assemblies represented by the failing
sample.
4.4.3.2 Clearance destructive method. The body assembly
selected for compliance with 3.4.6 need not be processed through
the band machining line, although the band should have a light
surface cut (0.020" max.) to provide a uniform surface for
measurement. The diameter of each band shall be measured at three
locations, sixty degrees apart, on the points along the
cylindrical portion of their length, near the front and rear
edges. This results in six (three pairs of two) diametrical
measurements per band. The points of measurement shall be marked
on the band and the projectile body adjacent thereto in such a
manner as to permit proper body and band orientation after
removal. The band shall be carefully removed so as to keep
deformation to a minimum. After removal, the thickness of the
band shall be measured at each of the marked points (a total of
twelve measurements) and the diameter of the band seat
corresponding to these points shall also be measured. Add to each
of the diameters of the band seat the sum of the two
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