British engineers created a really innovative and durable horizontal vibrating screen centrifuge that was meant to go into resonance using European standard 50 Hz motors:
https://birtley.us/centrifugesI had a devil of a time finding rubber mounts that would shift this resonance frequency to match USA 60 Hz motors.
This centrifuge was driven by a big belt pulley with a unique hub design that needed no keyway or splines on the shaft - plain round smooth shaft.
I was sure it would slip over time either forward/back or clockwise, but it held firm.
