Chuck Yung
EASA Senior Technical Support Specialist

Most service centers balance rotors routinely, with few surprises in the process. There are even technicians who balance rotors so well that the highest velocity readings on the test bed are normally under 0.01 inch/second. It is a great indication of quality when a customer swears that a motor has never run that smoothly. Most of us do not balance fans nearly as often as rotors. The fan balancing tips in this article should be helpful. We'll start with a basic explanation of balancing and then get into balancing tips for fans. Many of these are also applicable to impellers, large sheaves and other rotating parts our customers may ask us to balance.

Topics covered include:

• Balancing basics
• Differences when balancing fans
• Building a balancing mandrel
• Alternative solutions
• Other factors that affect balancing

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