MIL-DTL-81963C
3.4.15 Soldering. Soldering shall be performed in accordance with methods, which will enable the
product to meet the performance requirements of this specification. For additional information, see 6.8.
3.4.16 Magnet wire. Magnet wire shall conform to ANSI/NEMA MW 1000, MW 75-C, Class 130 or
higher.
3.4.17 Copper Wire. Copper wire shall be used, which will enable the product to meet the performance
requirements of this specification. For additional information, see 6.15.
3.4.18 Pure tin. The use of pure tin, as an under plate or final finish, is prohibited both internally and
externally. Tin content of servocomponents and solder shall not exceed 97 percent, by mass. Tin shall
be alloyed with a minimum of 3 percent lead, by mass (see 6.16).
3.5 Design and construction.
3.5.1 Termination identification. Winding terminations shall be as specified in the applicable
documents and the specification sheet that cite MIL-DTL-81963 as a direct reference. (The identification
of terminal screw, solder pin or wire lead types shall be as specified in the applicable general
specification.) Terminal identification markings shall be molded permanently into the servocomponent
end cap. The design of the end cap shall be such that the material in the terminal recess is below the
surface of the female-threaded post. All unused terminal positions should be closed or filled. When
thread type terminations are specified, the design of the end cap shall be such that the terminal block
shall remain fixed, when terminal screws are removed.
3.5.2 Servocomponent zero marking. The servocomponent housing shall be permanently marked with
an index line or arrow adjacent to the rotor shaft to coincide with a permanent mark on the rotor shaft
within 10 degrees of exact servocomponent zero, as indicated in the applicable general specification
outline drawing.
3.5.3 Dimensions. All dimensions and tolerances of this specification and the applicable general
specification shall be in accordance with the latest issue of ASME Y14.5M.
3.6 Performance.
3.6.1 Visual and mechanical examination (see 4.9.1). The servocomponent shall meet the applicable
requirements specified for materials, design, construction, physical dimensions, marking and
workmanship.
3.6.2 Shaft radial and end play (see 4.9.2). With a mechanical load on the rotor shaft as specified in
figure notes of either the applicable general specification or documents and the specification sheet that
cite MIL-DTL-81963 as a direct reference, the servocomponent shall meet the shaft radial and end play
limits specified therein.
3.6.3 Shaft runout (see 4.9.3). When required by the applicable general specification, the shaft runout
shall not exceed the specified value of the applicable documents and the specification sheet that cite MIL-
DTL-81963 as a direct reference.
3.6.4 Rotor moment of inertia (see 4.9.4). When required by the applicable general specification, the
moment of inertia of the rotor shall be no greater than that specified in the applicable documents and the
specification sheet that cite MIL-DTL-81963 as a direct reference.
3.6.5 Breakaway torque.
3.6.5.1 Mechanical breakaway torque (see 4.9.5.1). When required by the applicable general
specification, the torque required to turn the rotor shall not exceed the values specified in the applicable
documents and the specification sheet that cite MIL-DTL-81963 as a direct reference.
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