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Vibrasindo

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Pre-Balance Tips

 

QUESTION

Are there any tasks I should carry out before performing a balance job?

ANSWER

Yes. We recommend you work through the following list of pre-balance procedures. These will help determine whether the high vibration levels are caused by imbalance or some other problem. They will also give you a benchmark for comparing your machine's vibration to industry standard acceptable levels.

1. Before starting a balancing job to correct a reported vibration issue, begin your analysis by taking an overall vibration reading and comparing the results to the ISO 10816 specifications (refer to the table further down the page).
2. Next, collect spectral data to ensure that you can verify a major contribution at 1X running speed. Also collect phase readings to reinforce that the high vibration is actually caused by imbalance. Phase measurements are key to determining if the vibration is caused by static or dynamic imbalance, and whether it can be addressed by the one-plane or two-plane method.
3. As other faults might be present, correct any mechanical looseness that might create high 1X, 2X, or 7X vibration.
4. Address any misalignment that creates high 1X, 2X or 3X vibration. Also be sure to address any structural resonance at (or near) running speed that will cause unstable phase readings.

ISO 10816

This standard establishes the general conditions and procedures for the measurement and evaluation of vibration, using measurements made on the non-rotating parts of machines. The general evaluation criteria relate to both operational monitoring and acceptance testing and have been established primarily with regard to securing reliable long-term operation of machines.

The ISO standard defines four groups of machines according to their size and purpose. Machine operating conditions are separated into 4 colored zones, which graphically demarcate acceptable and excessive vibration levels.

• Green Zone A: Vibration values of a newly operational machine.
• Yellow Zone B: The machine can run in continuous operation without restriction
• Orange Zone C: The machine condition is unsuitable for continuous operation and should only operate for limited time periods. Take corrective measures at the earliest opportunity.
• Red Zone D: The machine is experiencing dangerous levels of vibration which may cause damage.



Disclaimer: Commtest Instruments Ltd accepts no responsiblity for any direct or indirect consequential damages from the use of this information.