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Why must the rotor of a centrifuge be carefully balanced?
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centrifuge
Figure 1: Tubular centrifuge
It is essential that a loaded rotor in a centrifuge be carefully balanced to minimize vibration and strain on the machine's shaft and bearings.
Balancing the rotor ensures that the total mass is distributed about the axis of rotation such that the resultant of all elemental forces is zero. Proper balance is critical because, at high speeds, even minor imbalances can create significant mechanical stress, potentially leading to equipment failure or rupture of the rotor material.1