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Accuracy of standard measuring equipment |
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|  MIL-C-45574B(AR)
4.5.2.2 Accuracy of standard measuring equipment. When commercial and
modified commercial inspection and test equipment is used, it shall be capable
of repetitive measurements to an accuracy of 10 percent of the total tolerance
of the characteristic being inspected.
4.5.3 Protective coating. Tests of protective coatings shall be conducted in
accordance with the applicable drawings and specifications. A minimum of one
sample specimen for each applicable test shall be selected from the lot being
inspected. The lot shall be subject to rejection if any specimen fails in any
of the tests.
4.5.4 Tubes. All external and internal surfaces of each tube shall be
examine magnetic particle inspection in accordance with MIL-STD-1949.
4.5.5 Coupling and chamber. All external and internal surfaces of each
coupling and each chamber shall be examined by magnetic particle inspection in
accordance with MIL-STD-1949.
4.5.6 Carrier. All external and internal surfaces of each carrier shall be
examine magnetic particle inspection in accordance with MIL-STD-1949.
4.5.7 Function tests. Each gun-launcher shall be subjected to the following
tests. These tests may be run on the breech mechanisms as a separate assembly
if so designated by the procuring agency. In this event, tests 4.5.7.2.3
(position "A" only) and 4.5.7.4 shall be re-run on the completed gun-launcher.
Cannon failing to meet requirements shall be rejected.
4.5.7.1 Limit switch setting. The circuit across pins K and N of the main
disconnect shall be Interrupted 90 degrees minimum prior to crank reaching the
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mechanical stop in opening direction. The circuit across pins K and L of - the
main disconnect shall be interrupted 60 degrees minimum prior to crank
reaching the mechanical stop in the closing direction.
NOTES: a.
Satisfactory manual actuation must be accomplished prior to any
electrical actuation.
b. A cycle, with respect to operation of the breech assembly, is
defined as the opening followed by the closing of the breech
chamber.
4.5.7.2 Electrical actuation.
4.5.7.2.1 18 volt setting. At an ambient temperature of 75 + 5F with an
impressed DC voltage of 18 volts +2, -0 volts applied at the launcher harness
connection, cycle the breech assembly three times in each position "A" thru
"c". Record the motor current, voltage, and time required for each-cycle.
The time for each partial cycle shall not exceed 3.5 seconds either "to open"
or "to close" the breech chamber. The total actual time for each complete"
cycle shall not exceed 6.5 seconds (this does not include cycle delay time).
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