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Terminal boxes and terminal box covers |
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|  MIL-M-17059A(SHIPS)
3.1.21.2 Copper segments. - The copper segments shall be securely retained in such manner as will
prevent their relative displacement as a result of centrifugal forces and the stresses imposed by repeated
expansion and contraction in service. The segments shall be of ample section to operate satisfactorily when
worn to a depth of a minimum of 1/16 inch on the diameter.
3.1.21.3 Connections. - The connections to the windings shall be effectively soldered, brazed, or hot
or cold welded.
3.1.21.4 Sealing. - After the assembly of the commutator, all crevices or joints at each end between
the bars and the retaining flanges shall be completely filled up and sealed over with high-grade, flexible,
baking insulating varnish in such manner as to prevent the entrance of moisture, oil, carbon, or copper
dust, or other deleterious substances at these points, likewise, the creepage paths from the ends of the cop-
per bars to the metal flanges shall be given a heavy, durable coating of flexible, baking insulating varnish
as a protection against short circuits and ground at these points. This sealing may be accomplished as
part of the varnishing procedure of the armature.
3.1.21.5 Mica undercutting. - The mica insulation between bars shall be undercut on all motors. The
undercutting shall be accomplished by removing all mica between bars to form a groove not to exceed 3/64
inch in depth.
3.1.21.6 Curing. - All commutators with non-thermosetting materials shall be cured at higher than
operating temperatures and shall be of such thoroughly solid construction throughout as will insure that
they will hold their shape in service and obviate the necessity of frequently dressing the commutators on
account of high bars or flat spots.
3.1.22 Terminal boxes and terminal box covers. - Terminal boxes and covers shall be provided and
shall be either securely bolted or welded to the frame or shall be an integral part of the motor frame or
end shield. The use of pipe nipples where they are necessary or where motors are to be used in inaccessible
locations shall be satisfactory to the bureau or agency concerned.
3.1.23 Connections and terminals. -
3.1.23.1 Securing connections. - All connections, mechanical and electrical, shall be provided with
locking devices in accordance with MIL-E-917. Connections and leads shall be secured in a reliable manner
to prevent their coming in contact with moving parts or being chafed by contact with stationary parts. All
excess solder shall be removed from soldered connections.
3.1.23.2 Terminal connections. - The terminal leads shall be brought out of the end shield at the end
opposite the drive end and at the right-hand side when viewing this end or out of the frame at the right-hand
side when viewing the end opposite the drive and as close to this end as is practicable.
3.1.23.3 Securing terminal leads. - The leads shall be secured by anchoring them to the motor windings
so that no strain is put on the end connections, or by a lead clamp. Where a lead clamp is provided, the
terminal leads shall be attached to the frame and not to the end shields.
3.1.23.4 Flexible leads. - All terminal leads shall be made of flexible, stranded insulated wire. Means
shall be provided to prevent abrasion of the lead insulation by metallic edges of the motor frame, terminal
box, piping, or cable clamp.
3.1.24 Lead wire identification. - All lead wires shall be permanently marked in accordance with
MIL-E-917.
3.1.25 Radio noise. - The design of the motors shall be such as to insure a minimum amount of radio
interference.
3.1.26 Painting. - Painting shall be in accordance with MIL-E-917.
3.1.27 Class of insulation. All insulation shall be in accordance with MIL-E-917 and shall be class
A, B, F, H or N as specified (see 6.1).
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