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7.2.2.4 Elevation Motor
The elevation drive motor is typically a DC motor with an optical encoder mounted to the motor
output shaft, to provide real time positional information to ACU.
Figure 7.2.2.4 - Elevation Gear Box and Motor
Since the low backlash worm gear drive isolates the backlash from the motor, any backlash between
the shaft adapter, coupler, or motor gear train will not be seen by the reflector bore sight. The
motor is mounted to an adapter plate that is bolted to gearbox. No maintenance of the elevation
motor is required.
7.2.2.5 Elevation Cable Drive
The elevation cable drive system provides zero backlash, high stiffness, no wear, no lubrication, and
maximum reliability. The system consists of stainless steel aircraft control cables reverse wrapped
twice around the grooved capstan, and once around the drum, with solid connections on one end
and high force Belleville springs on the other end. The additional cables are used to provide
increased stiffness and drive redundancy.
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