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Balancing Services                                                                                                                                                                                                                                                                                                                                                                                                   Request for Quote  

 Call New England SpinTech for all your Balancing Needs

Excessive unbalance in rotating machinery can cause unacceptable levels of vibration and noise and substantially reduce the life of bearings and other parts of the machine. The ideal solution would be to remove all causes of vibration and run the unit completely "smooth".  Unfortunately in reality, this ideal solution cannot be achieved. No matter what is tried some inherent cause of vibration no matter how low, (usually unbalance) will remain.  The best one can do is to reduce this unbalance to a level that will not adversely affect the machine life and will reduce noise levels to an acceptable level.

This being the case, there are industry standards that set limits for acceptable vibration levels in various types of equipment and situations.  These standards are used by balancing companies to achieve acceptable vibration limits without “over balancing” and increasing balancing costs unnecessarily.

Reasons for balancing in the field         Visit our Field Balancing Page

An in service rotor can have material buildup (dirt or grease on fans) or material loss (erosion on material moving fans), bearing wear that affects the center of rotation (severely worn parts need to be replaced before balancing), shaft distortion due to residual stress relaxation, structural changes, or speed increases. This causes vibration that will result in premature failure of bearings and other machine components. It can also result in cracks and other structural defects that could cause catastrophic failure.  When possible, balancing in place is very cost effective compared to disassembling the machine and removing the rotor.

Reasons for shop balancing             Visit our Shop Balancing Page

If a rotor is damaged to the point where it needs to be removed and repaired (welded, etc.) then shop balancing is the best option.  If the rotor is removed for other reasons, checking and balancing before reassembly is also a good practice.

Newly manufactured rotors are usually shop balanced prior to assembly in their respective machines. Cast parts may have voids that are not apparent from the outside and even machined parts that appear perfectly symmetrical can have inconsistencies for various reasons. Balancing before assembly assures quality and dependability.

Trim balancing in the field

Occasionally a shop balanced rotor, e.g., a fan, may have residual vibration when installed in the field.  Assuming everything is assembled properly, this is usually a structural issue such as system resonance. A simple trim balance may help to reduce the vibration, however in some cases the mounting structure may need altering (changing mass or stiffness) to reduce the vibration.

 

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