MIL-L-23249D
4.2 Classification of inspections.
The inspection requirements specified
herein are classified as follows:
a. First article inspection (see 4.3).
b. Quality conformance inspection (see 4.4).
4.3 First article inspection. When a first article inspection is
required, it shall be applled to the first article submitted in accordance
with 3.1. Unless otherwise specified (see 6.2.1), first article inspection
shall consist of the examination in 4.5 and all tests in 4.6. Failure of
the item to pass the first article tests shall be cause for rejection.
4.4 Quality conformance inspection. Quality conformance inspection shall
be applied to each item prior to being offered for acceptance under the
contract. Unless otherwise specified (see 6.2.1), quality conformance
inspection shall consist of at least the examination in 4.5 and the tests in
4.6.1. Failure of the item to pass the examination or tests shall be cause
for rejection.
4.5 Examination. The machine and equipment shall be examined to
determine compliance with the requirements of 3.2 through 3.7.
4.6 Tests.
4.6.1 Operational test. The lathe shall be operated at no load for not
less than 60 minutes. Proper operation of all controls, motors, adjusting
mechanisms, and accessories shall be verified during the trial period.
4.6.2 Alignment accuracy tests. Each lathe shall be tested to determine
that it complies with the alignment accuracy requirements of table II (see
3.6).
4.6.3 Performance tests. The lathe shall be subjected to the following
turning tests to determine conformance to the accuracies of table III (see
3.7).
4.6.3.1 Round turning test. A bar of SAE 1045 carbon steel or steel of
similar machinability, not less than 2 inches in diameter and 4 inches long,
shall be held in the chuck furnished with the lathe. A rough and finish cut
shall be made at least 2 inches long using a cutting speed of not less than
80 feet per minute. The turned diameter shall conform to the accuracy of
the round turning test in table III.
4.6.3.2 Cylindrical turning test. Using the same type bar as for the
round turning test, the bar shall be not less than 4 inches in diameter and
12 inches long. The bar shall be semi-finished with a collar at each end of
the bar. The collars shall be not less than 4 inches apart. A finish cut
shall be taken over the two collars in one pass using a single point carbide
tip turning tool and a cutting speed not less than 350 feet per minute. The
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