I Why is there no torque along this axis?

AI Thread Summary
The discussion centers on the absence of torque along the horizontal AB axis of a gyrocompass due to its pivoted axle. It is explained that the pivot prevents torque transmission from the supporting pillars to the gyro, as pivots cannot transfer moments or torques. Although the spinning disk generates significant torque, this force cannot affect the turntable disc because of the pivot's design. The analogy is drawn to an electric motor, where the spinning shaft exerts torque without transferring it to the anchored base. This illustrates the fundamental principle that a pivoted system can isolate rotational forces.
Kashmir
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Kleppner and Kolenkow say "Consider a gyrocompass consisting of a balanced spinning disk a light frame supported by a horizontal axle. The assembly is turntable rotating at steady angular velocity Ω. There cannot be any torque along the horizontal AB axis because the axle is pivoted".

I'm not getting why there can be no torque along the axle due to it being pivoted ?
 

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Because the axis is pivoted with no torque transmitted from Y shape pillars to the gyro, I assume.
 
Pivots are unable to transfer moments or torques.
The spinning disc could apply a huge torque on the rotating plane to the horizontal axis AB, but none of it could ever reach the turnable disc.
It is exactly what happens between the spinning shaft of an electric motor and its anchored base.
 

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