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Breech mechanism assembly for M162 cannon |
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|  MIL-C-45574B(AR)
3.3.2 Breech mechanism assembly for M162 cannon. The breech mechanism for
the M162 cannon shall be assembled in accordance with the requirements of
drawing 11578135.
3.4 Autofrettage. Breech chambers, as well as tubes, shall be autofrettaged
in accordance with the requirements of MIL-C-13931 for tubes.
3.5 Lubrication. Apply lubricant MIL-L-46150 to all movable and sliding
surfaces except ball screw threads before functional testing.
3.6 Operation. The cannon shall operate in any attitude within 35 degrees
elevation, 23 degrees depression, and 15 degrees left or right cant and any
ambient temperature between -65F and +140F.
3.6.1 Electrical Operation of Breech Mechanism Assembly.
3.6.1.1 Power required. The breech mechanism assembly shall operate with
applied drive-motor terminal voltages from 18 to 30 volts DC. At 24 volts 1
volt and at an ambient temperature of 75 + 5F, with the exception of a
transient surge at the initiation of an opening or a closing phase, the
current shall not exceed 40 amperes. In any 10 complete cycles, the increase
in current value shall not exceed five amperes for the conditions specified in
this paragraph and 3.6.
3.6.1.2 Breech mechanism assembly operating time. The breech mechanism
operating time at any attitude specified in 3.6, and at any voltage from 18 to
30 volts DC, shall not exceed 3.5 seconds for either an opening or a closing
phase of a cycle and shall not exceed 6.5 seconds for one complete cycle. In
addition, at 24 volts + 1 volt DC, and at an ambient temperature of 75 + 5F,
the operating time shall not exceed 2.8 seconds for either an opening phase or
a closing phase and shall not exceed 5 seconds for one complete cycle.
3.6.2 Manual operation. The maximum input0 torque at the hand crank to
operate the breech mechanism at zero degree (0 ) elevation and between fifteen
degrees (15) left to fifteen degree (15) right cant shall not exceed 300
pound-inches at ambient temperatures between -65F and +140F.
3.6.3 Obturator, cap-detent, and firing-probe seals. The obturator seal
shall be readily removable. The obturator, cap-detent, and firing-probe seals
shall prevent the escape of hot gases and powder residue into the turret area.
3.6.3.1 Seal area surfaces. Damage shall be prevented while cleaning
preserving, and handling parts used in the obturator seal areas. These
surfaces shall be protected during machining and handling.
3.6.4 Breech chamber closure. The breech mechanism assembly whall prevent
movement of the breech when fully closed. When fully opened, the breech
mechanism assembly shall prevent the breech chamber from closing under shock
and vibration of vehicle operation.
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