MIL-L-23400E
4.7.3
Electromagnetic interference control tests.
Equipment requiring
electromagnetic interference control (see 6.2.1.k) shall be tested for
compliance with 3.3.9.
4.7.4 Protective finish test. When specified (see 6.2.1), equipment
requiring a protective finish shall be tested for compliance with 3.3.5.1.
The hardness, adhesion and thickness of the protective finish on the lathe
shall be checked as follows:
a. The graphite point of a sharpened HB lead pencil shall be pressed at
a right angle into a painted area of the lathe until the graphite crumbles.
Failure of the surface to withstand the test, as evidenced by a pitting of
the paint, shall be cause for rejection.
A test sample of the same metal, painted with the same process and
b.
at the same time as the lathe, shall have a sharpened H lead pencil pressed
Failure to penetrate the surface of the paint
into the paint as in (a).
down to the base metal, (paint Loo hard), shall be cause for rejection.
c. Two , 2-inch intersecting lines shall be cut through the paint to the
A strip of 1/2-inch wide fiberglass tape
base metal of the test sample.
shall be firmly pressed over the Intersection and then pulled from the sur-
face. Adhesion of any paint to the tape shall be cause for rejection.
Using a paint thickness measuring instrument, or by masking a por-
d.
tion of the test sample during painting, measure the thickness of the paint.
Failure of the paint to be at least 0.0020 inch-thick shall be cause for re-
jection.
4.8 Packaging inspection. Packaging of each item shall be inspected to
determine compliance with the requirements of section 5.
PACKAGING
5.
5.1 Preservation, packing, and marking. Unless otherwise specified, pre-
servation, packing, and marking shall be in accordance with ASTM D 3951.
When specified (see 6.2.1), level A preservation, level A or level B pack-
ing, and marking shall be accomplished in accordance with MIL-M-18058.
NOTES
6.
6.1 Intended use.
The lathes covered by this specification are intended
for use--in any machine shop for production or toolroom where the nature of
the work performed does not require heavy machining capabilities. The
lathes are suitable for turning, boring, facing, threading, and taper turn-
ing using high-speed steel or carbide tooling.
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