Hello, I have a platform that is cantilevered, and pinned on one end. The angle of the platform is controlled by a ballscrew. The bevel gear housing pivots, and the motor and gearbox are fixed to the ground. I've attached a diagram to give a better understanding of the layout. I need to know what the equivalent inertia "seen" by the motor is, and I have no idea where to start. The gearbox ratio is 30:1, and the bevel gears are 1:1. The weight on the platform is 2000 lbs max. The weight is constant, but as the ballscrew elevates the platform, its angle will change and thus the load on the ballscrew will change. Does the inertia of the ballscrew change since the load is changing?