MIL-DTL-17060G(SH)
(a) Bolts and washers shall be corrosion resistant. Bolts shall be securely attached when a corrosion
resistant, split-ring lockwasher and one of the following methods of attachment are used:
1 Bolts or nuts with nylon inserts in accordance with MIL-DTL-18240, Type P or N, if
temperature conditions permit.
Thread locking compound in accordance with A-A-59720.
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3 Welding of bolt head to steel plate. Bolts shall not be directly welded to rotor laminations.
The split-ring lockwasher shall be substituted for by one of the locking methods indicated above.
(b) When correcting imbalance with bolts and washers, the stack height of washers placed under a
bolt head, including the lockwasher, shall be limited to that which shall provide no less than the minimum thread
engagement between the bolt and the threaded hole in accordance with FED-STD-H28 (see MIL-E-917).
(c)
Steel weights, securely welded. Weights shall not be welded directly to rotor laminations.
c. For wound rotating assemblies, the use of solder on banding wire is permissible subject to the following
limitations:
(1) Diameter of the rotor does not exceed 16 inches.
(2) Peripheral speed does not exceed 6,500 feet per minute at synchronous speed.
(3) Armature cores are balanced before the windings are inserted.
(4) Only tinned banding wire is used.
(5) The solder does not cover an arc of more than 25 percent of the circumference of the armature
measured on the banding wire unless satisfactory to the Command or agency concerned (where the manufacturer
prebalances the armature and takes care in placing the windings in the slots to reduce unbalance due to the axial
misalignment of the coils, this value may be increased to 33 percent if satisfactory to the Command or agency
concerned).
(6) Thickness of solder over banding wire does not exceed 3/32 inch, and in no case extends past the center
of the air gap.
3.5.1.16 Armature and coil banding using glass. Semi-cured thermosetting resin treated glass insulation tape
may be used for armature and coil banding in lieu of steel wire banding. Glass banding materials and methods of
application shall be in accordance with MIL-I-24178.
3.5.1.17 Field coils. Field coils for synchronous motors shall be thoroughly insulated from adjacent,
conducting, and grounded parts. They shall be secured to prevent motion of the coil with respect to the poles or
other parts when the motor is operating. Coils of the same type shall be interchangeable.
3.5.1.18 Mounting. Motors shall be configured for mounting either in the horizontal or vertical position as
specified (see 6.2). Mounting feet or flanges, as specified (see 6.2), shall have machined mounting surfaces and
shall be provided with round holes for mounting bolts (for submarine application see 3.5.2.5.2 and 3.5.2.5.3).
3.5.1.19 End shields (EXP, EXPFC, and EXPAO motors excluded). An accurate shoulder joint shall be
provided between the frame and end shields. When specified (see 6.2), the end shields shall provide for the rotation
through 90 degrees or 180 degrees in either direction to allow for bulkhead or underside suspension of the motor.
Resilient gaskets shall not be placed between any bearing support member or bearing end cap and the frame or end
shield. For spraytight, watertight, and submersible motors, the contact surfaces between the enclosing covers (ex.
outer bearing caps) and the motor frame or end shields and between the frame and end shields shall be free from
fins, burrs, or other imperfections detrimental to watertightness. The contact surfaces shall provide the necessary
degree of watertightness by creating a tight metal-to-metal fit or shall be provided with O-rings suitably retained and
treated with graphite on the contact surface to prevent sticking. The use of sealants to create watertightness is
prohibited.
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