What Information Is Needed Before Rotor Balancing?
A practical checklist covering rotor mass, dimensions, journals, speed, construction and the reported vibration problem.
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Rotor Balancing Articles
Articles on getting the right balance.
Static balancing vs dynamic balancing
The difference between static and dynamic balancing, why a rotor can have no heavy spot yet still vibrate, and when two-plane balancing is required.
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When should a rotor not be balanced?
Cases where balancing should stop and the rotor should be repaired, cleaned, inspected or otherwise made mechanically safe before correction weights are applied.
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Balancing a rotor with a keyway
Why the key condition matters during balancing and how the ISO 21940-32 half-key convention prevents artificial unbalance in separately balanced components.
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Fan impeller balancing problems
Common reasons fan and impeller balancing results are inconsistent, including deposits, fit eccentricity, runout, repair distortion and assembly repeatability.
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How much residual unbalance is acceptable?
How to calculate a meaningful residual-unbalance tolerance from rotor mass, speed and balance grade, and why grams alone are not enough.
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Single-plane vs two-plane balancing
When one correction plane is enough, when two planes are required, and why a rotor can be statically balanced yet still contain couple unbalance.
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Why a balanced rotor can still vibrate after installation
A rotor can pass a balancing-machine residual-unbalance check and still produce high machine vibration. Here are the main reasons and how to separate them.
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G2.5 vs G6.3 rotor balancing
A practical comparison of G2.5 and G6.3 balance grades, including how much tighter G2.5 is and when a tighter grade is actually useful.
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What ISO 21940 balancing grade should I specify?
How to choose a rotor balance quality grade without treating G2.5 or G6.3 as universal answers, and how speed and rotor mass affect residual-unbalance tolerance.
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