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Re: Turns out Helical Beam Couplers aren't meant to handle that much stress . . .
You really need a rigid coupling there since you are transmitting a bending moment through it. (Like you giant solid piece of aluminum?). Flexible couplings are meant to transmit torque, not to hold things in alignment.
To help with the resonant frequency and the vibration, cut off the extra length of screw since it is mass whipping around. Use a a speed controller on the motor to slow the screw down. The more it extend, the faster it can go.
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