First, let's look at the big disk as it spins.

 Disk's moment of inertia around its center       I  =   


   disk ang vel        disk ang vel         disk ang momentum         direction
      (RPM)              (rad/s)               (g*cm2/s)
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      200

      320

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Now, consider the gravitational forces on the four components of this device. That force on each component produces a torque around the pivot point.

     component     formula for torque      value of torque           direction
                   around pivot           around pivot (g*cm2/s2)
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     disk                                                              
 
  weight 1                                                             

  weight 2                                                             
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Sum so far


  weight 3                                                             
==============================================================================
   total                        

The total torque on the device causes its angular momentum to change its DIRECTION. The gyroscope starts to rotate around the pivot point. How long does it take for the device to complete one full revolution?

   disk ang vel         disk ang momentum            dφ/dt        Period
      (RPM)                (g*cm2/s)                 (rad/s)        (s)
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      200

      320

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