## A Clean Fan = A Clean Balance!

Editor’s Note: This Blog is authored by Brian Rimmer (Freudenberg) & Stan Riddle (Acoem USA) Acoem USA recently provided dynamic balancing training for Freudenberg in Durham, NC, using an Acoem Falcon vibration analyzer/balancer they had purchased.  During the class, Acoem was asked to assist in balancing a large primary air fan.   Inspection of the…

## Learn to Hold Down Your Equipment!

During a recent balancing class, I was requested to help the customer balance a couple of fans. Typically, our services team does this, but I agreed to help. When we got to this rooftop penthouse, I noticed a few things: The fan wheel, housing, and shaft were coated in a fairly thick coat of rust…

## Static, Couple, and Dynamic Unbalance

According to the International Organization for Standardization (ISO), unbalance is “that condition which exists in a rotor when the vibratory force or motion is imparted to bearings as a result of centrifugal forces”. In other words, unbalance is an unequal weight distribution of a rotor around its rotating centerline. The rotating centerline or rotational axis…

## A Handy Guide to Balancing Rotating Machinery

Balancing rotating machinery is mostly math, with a bit of common sense and experience thrown in. The math is constant, so here are some tips to help with the common sense and experience part. Preparing to balance Inspect before you balance I once balanced a fan by pulling an air filter out of the fan…

## Balancing How To #5 – How A Correction Weight and Location is Calculated

In our last “How To” we talked about the trial run – using a trial weight and location, to calculate the amount and location of a correction weight, which should correct the unbalance.  Most modern-day balancing tools do the math for you.  Even though these tools calculate the correction weight and location, it is good…

## Balancing How To #4 – Calculating a Trial Weight Mathematically

In our last Balancing How-To, I stated that an initial trial weight is sometimes a guess.  Sometimes based on experience, and sometimes on common sense.  But if you prefer to be a little more scientific about it, there are ways to calculate a good trial weight. There are a few requirements to calculate a trial…

## Balancing How To #3-Where and How to Place and Affix a Trial Weight

Once unbalance is determined, the original unbalance run (amplitude and phase) is measured, and a trial weight size is determined, the next step is where to place the trial weight. If you have no balancing record for this rotor, where to place the weight is little more than a guess.  But there are some things…

## Balancing How To #2 – Selecting a Proper Trial Weight

In our last Balancing How To, we discussed how to set up and get your original measurements on the rotor to be balanced.  This How To discusses selecting a proper trial weight. A trial weight is used to make a change in the original vibration amount and direction.  Changing either the AMOUNT of vibration (amplitude),…

## Balancing How To #1 – Setting Up for Balancing

The recent blog on troubleshooting balancing ( https://acoem.us/other-topics/smc-touch-tip-using-the-smc-when-unbalance-is-diagnosed/ ) brought up some additional questions from our readers, so let’s tackle them in order. The first one is setting up to perform a balance job. NECESSARY EQUIPMENT FOR BALANCING If you have gone through the checklist and confirmed unbalance, you will need: A machine to perform…

## SMC Touch Tip-Using the SMC When Unbalance is Diagnosed

The Fixturlaser Smart Machine Checker (SMC) is a great balancing tool (for me personally, it’s the best balancer I’ve ever used).  Unbalance is one of the most common machinery problems on rotating equipment, especially fans. If you get a diagnosis of unbalance, be aware of these tips: Be mindful that a rotating mass, once balanced,…

## Here are the Top Maintenance Tips from VibrAlign Experts

As you may have noticed if you follow VibrAlign’s social media accounts, we have been going through “Maintenance Tip Mondays” for the past couple months. This is a fun opportunity to hear from our experienced technical trainers as they share the top tips and tricks they have learned over the years in the field and…

## Precision Alignment and Balance isn’t Important – Unless you care about budgets and the reliability of your rotating assets.

I read an interesting article in the June/July 17 issue of Uptime Magazine. It was titled “The Reliability Impact Within the P-F Curve” by Randy Riddell. Randy is the Reliability Manager for the SCA Barton Mill in Alabama. I encourage you to read the full article (https://reliabilityweb.com/articles/entry/the-reliability-impact-within-the-p-f-curve). The article includes the following graphic that I…

## TROUBLESHOOTING MOTOR UNBALANCE

Electric motors are almost always well-balanced when they leave the motor manufacturer.  But occasionally, motor unbalance problems are picked up with vibration monitoring tools, such as the OneProd Hawk. Here are some easy troubleshooting methods to determine the cause of unbalance in the motor. An electric motor’s rotor, like any rotating mass, cannot become out…