We recently received a call from a customer who makes fiber optic strands. Fiber optic strands are glass tubes that are heated and stretched into long optic fibers that are later incorporated into a data transmission cable. They hired us to help find the cause of a vibration problem in the fan enclosure used in the production of making the fiber optic strands.
The main stranding room has a highly controlled atmosphere that is dust filtered, as well as, having the humidity and temperature control highly monitored. On a floor, just above the production room, sits a fabricated steel box enclosure with two 30 hp direct drive fans. The steel box is decent sized. To give you a good visual idea, it is about one-half the size of an overseas shipping container. There is some bracing in the long spans along with ductwork attached to the outside going in and out. The ducting is about 4’ square in cross section.
Inside the box are two 30 hp direct drive fans. The fan wheels are about 48” in diameter. The motors sit on a chassis suspended on vibration isolators with the required “more than an inch of static deflection.” The fans sit side-by-side. A series of airflow control devices are employed. There is an adjustable damper just outside the enclosure on the inlet duct. Both fans are speed controlled on variable speed AC drives. There are sophisticated inlet dampers built into each fan inlet. The complaint was that vibration was transmitting from the fans into the walls of the enclosure. During full production, the fan enclosure vibration was enough to concern the facility manager. His concern was vibration would begin to break apart the enclosure. Conversely, it seemed unlikely the fans were the culprit of the destructive vibration, as the isolators seemed to be doing what they were intended to do. The vibration seemed to be at much lower frequency than the fan speed. Finding the cause of vibration requires eliminating sources one at a time.
Continue reading “We Look at All the Causes and Effects of Vibration and Balancing Analysis”
Rotating machinery is everywhere. We are often asked, ”What do you balance?” Rotating machines are responsible for making daily life possible. From heavy manufacturing to high rise building air conditioning – Rotating machinery utilizes high speed moving parts. These high speed moving parts need balancing. Over time those parts may go out of balance and begin to vibrate,causing the machine to run less efficiently. Also if the vibration and imbalance are not properly addressed it can cause adverse conditions on structures and the human environment. Severe vibration causes noise and human fatigue. That’s why there are companies such as ours that can analyze vibration and provide dynamic balancing and mechanical repairs and solutions to eliminate it.
There are any number of balancing service providers out there, so picking the right one to balance your machinery can be tricky. Here are three top reasons why you should balance with HI-TEK:
- Vibration analysis and balancing is all we do.
Many companies and repair shops offer balancing as just one of many services. If balancing is not their primary business, you run the risk of getting just an okay balancing job that will eventually need to be rebalanced, costing more time and money. Just because a facility is certified doesn’t mean they’re especially skilled at balancing. From highly-precise micro and medical balancing to large rotator balancing – from prototype to production — dynamic balancing is our main business. Continue reading “3 Top Reasons for Balancing With Hi-Tek”
Vibration in most machinery is not a good thing. It creates unnecessary noise and wear and can eventually result in failure that can be costly in terms of both time and money. Machine balancing is therefore vital for ensuring smooth and efficient operation and to help prolong the life of the machine.
Here at Hi-Tek Balancing we specialize in the art and science of dynamic machine balance. We can identify problems such as unbalance by recognizing the distribution of mass – called the dynamic — in relation to force and vibration and then correcting that unbalance by adding or removing weight from the rotating component to minimize the force and vibration.
Proper machine balance is, of course, critical to a wide variety of applications and systems such as manufacturing, scientific, and test and measurement equipment. These can vary greatly — from small, highly delicate, high-speed laboratory equipment to massive, rugged industrial machines. Despite the extremes between these two very different examples, the challenges of vibration and wear are the same, just on different scales. The process and methodology of machine balancing is theoretically the same in both cases, where the effects of centrifugal force are usually the cause of increased vibration and decreased performance.
Continue reading “Machine Balance: The Art and Science”
All rotating components create some amount of vibration. When vibration becomes severe it can be very destructive when not corrected. Irregularities or asymmetries created either during the manufacturing process or due to wear are often the cause of vibration. They create a mismatch between the rotating axis established by the supporting shaft and bearings, and the axis of orbit around the actual center of mass of the rotating object. An unbalanced part tries to orbit about this axis of inertia while the shaft and bearings force the part to orbit about the different axis they dictate. This mismatch transmits the forces of vibration into the shaft and bearings, and their support structure causing stress and strain that these systems are not designed to handle.
Dynamic balancing is the process used to diagnose and correct the harmful vibration described above. We use purpose built dynamic balancing electronic instruments to aid in matching the axis of inertia about the center off mass, to the rotating axis established by the shaft and bearings.
Continue reading “What is Dynamic Balancing and why is HI-TEK the best choice?”
Whip balancing is an important part of maintenance for machines that have rotors. Resonant frequency is another name for whip. The resonant frequency is a measure of the speed, in cycles per minute, that a rotor will vibrate when forced off-balance.
A good example of this concept is a diving board. Having a long diving board means that after you jump off, it will vibrate much more than a shorter diving board. The flexibility or springiness of the longer diving board means that it has a higher resonant frequency. The frequency of these vibrations is high and the amplitude is low. A shorter diving board would result in vibrations with a lower frequency and a higher amplitude. Continue reading “What is Whip Balancing?”
Vibration analysis is not exactly a service that just anyone can provide. Because of that fact, many people tend to ask us to explain what we do. Here are a few explanations for you!
Vibration analysis is a vital service for all rotating equipment, as anything that rotates is bound to vibrate. As components like bearings get older, it’s more likely that the machine’s vibration will increase. This is something that you need to keep an eye on, because the additional vibration can cause the machine to literally tear itself apart. By monitoring your machines & performing routine maintenance, you’re essentially lengthening the lifespan of each machine, which is definitely a good thing. Continue reading “What is Vibration Analysis?”
A balancing machine is a tool used for measuring the rotating parts of a machine; such as rotors for electric motors, pumps, fans, turbines, and more. The balancing machine itself determines whether the rotating machine parts are formed evenly or if they will wobble off balance. Continue reading “Five Kinds of Balancing Machines”
Vibration analysis, with proper mechanical inspections, can make the difference between making the same ineffective repairs over and over again, or determining the precise nature of a problem and applying the proper solution once. Continue reading “Vibration Analysis Key to Avoiding Expensive HVAC Repairs”