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|  MIL-K-70606 (AR)
4.6 Methods of Inspection.
4.6.1 Cutting test. The MPBS shall cut barbed wire a minimum
of 50 times as specified in 3.4.1. The cuts shall be made in one
motion without resharpening. The MPBS shall cut a standard metal
band as specified in 3.4.1. in one motion.
4.6.2 Corrosion resistance. Three (3) MPBS shall be selected
from each lot. The bayonet shall be removed from the scabbard and
all metal parts shall be coated with oil per MIL-L-63460. The
test shall be performed as specified in ASTM-B-117. The time of
the test shall be three hours. Test procedures and equipment
shall have prior approval of the Government. If any part shows
evidence of corrosion, it shall be classed defective and the lot
shall be rejected.
4.6.3 Resiliency test. The MPBS shall be tested using a
contractor designed, Government approved test fixture. The blade
shall be clamped in the fixture such that one and one-half inches
of the pointed end of the blade is rigidly held. The grip end of
the bayonet shall be slowly deflected through a minimum arc of
1-1/4 inches to the right and 1-1/4 inches to the left of the
vertical center of the blade. On each bend, the bayonet shall be
held at the extreme deflection for one second and then,slowly
released. Blades having a set of 3/16 inch or less shall be
straightened before being returned to the lot.
4.6.4 Impact. The bayonet shall be held with the blade point
in an upward position in a Government approved fixture of
contractor design simulating the applicable rifle (See Figure 1, 2
and 3). A weight, with a block of soft, untreated maple wood
attached, shall be dropped on the bayonet knife point from a
height of 12 to 18 inches. The surface of the wood block shall be
positioned so that the blade penetrates across the woodgrain. The
weight and height shall be such that a minimum of 28 foot-pounds
of energy is applied on impact.
4.6.5 Twist. The bayonet shall be clamped in a contractor
designed, Government approved fixture simulating the applicable
weapon (See Figures (1, 2 and 3). The blade shall be twisted at a
point 1.500 0.125 inches from the guard. Bending of the blade
along the longitudinal axis shall be minimized. The bayonet shall
be given one twist of a minimum of 25 foot-pounds torque. The
torque shall be applied uniformly in both the clockwise and the
counter-clockwise directions.
4.6.6 Withdrawal. The bayonet shall be clamped in a a
contractor designed, Government approved fixture simulating the
applicable weapon (See Figures 1, 2 and 3). A minimum tensile
load of 250 pounds shall be applied gradually in the longitudinal
direction.
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