Balancing tool definition: imbalance
A balancing machine is an instrument designed to measure and eliminate the imbalanced mass of a rotor. Dynamic balancing machines spin the rotor to detect the center of mass through vibration sensors. These vibration sensors are usually accelerometers. Simple calculations then indicate the position of the correction weights to optimize performance.
2 mg - 200 mg
Residual unbalance
50 g - 50 T
Rotor capacity
Soft Bearing
Technology
Related resources
Erbessd EI-30 balancing machine is ideal for turbochargers and assemblies, as well as small rotors. It is a fully portable balancer that can be placed on any workbench. With this balancer you can make efficient and quick dynamic balancing machine jobs with great accuracy.
- Min Mass: 50 grams
- Max Mass: 30 kg
- Residual Unbalance: 0.2 g.mm/kg
- Speed: 900 - 15,000 RPM
EI-150 dynamic balancing machine is designed to accurately balance rotors of any type. The length of its bedplate allows balancing rotors of up to 2 meters long to be mounted.
- Min Mass: 5 kg
- Max Mass: 150 kg
- Residual Unbalance: 0.2 g.mm/kg
- Speed: 900 - 5,000 RPM
EI-300 dynamic balancing machine is designed to accurately balance rotors of any type. The length of its bedplate allows balancing rotors of up to 2 meters long to be mounted. Additionally, the EI-300 will allow you to make overhung rotor balancing thanks to its negative supports (optional).
- Min Mass: 15 kg
- Max Mass: 300 kg
- Residual Unbalance: 0.2 g.mm/kg
- Speed: 450 - 5,000 RPM
Balancing Machines Models EI-1000, 2000 and 3000 are one of the most versatile balancing machines, allowing you to balance anything, from small rotors to rotors weighing from 1 to 3 tons. This versatility makes these balancers our best sellers, as they adapt themselves to meet most rotor requirements in an average workshop. With these rotor balancing machines you can perform fast and accurate balancing jobs.
- Min Mass: 40 kg
- Max Mass: 1,000 / 2,000 / 3,000 kg
- Residual Unbalance: 0.2 g.mm/kg
- Speed: 300 - 4,500 RPM
EI-4500 and EI-6000 balancing machines have been designed for heavy rotors. These machines will allow you to balance rotors ranging from 150 kg to 6 tons. As with all of our machines, these balancers have an option for overhung rotors. You can get an extension of the base frame to be able to reach balancing rotors longer than 6 meters if needed.
- Min Mass: EI-4500: 100 kg / EI-6000: 150 kg
- Max Mass: 4,500 kg / 6,000 kg
- Residual Unbalance: 0.2 g.mm/kg
- Speed: 450 - 3,500 RPM
While we manufacture machines up to 50T in capacity, EI-10T is our most popular large balancing machine. This machine will allow you to balance tool rotors weighing from 200 kg to 10 tons. Extensions for extra large rotors are available as well as different roller work supports for smaller rotors.
- Min Mass: 500 kg
- Max Mass: 10,000 kg
- Residual Unbalance: 1 g.mm/kg
- Speed: 350 - 3,000 RPM
ERBESSD INSTRUMENTS®' EI-25T balancing machine is a heavy-duty solution for balancing large rotors with accuracy and stability. It is well suited for industrial applications involving rollers, electric rotors, crankshafts, fans, and other large rotating components, offering a reliable option for companies that want consistent balancing quality and strong performance in everyday operation.
- Min Mass: 50 kg
- Max Mass: 25,000 kg
- Residual Unbalance: 1 g.mm/kg
- Speed: 150 - 2,800 RPM
ERBESSD INSTRUMENTS®' 50-ton balancing machine is a heavy-duty solution for balancing very large rotors with accuracy and stability. It is well suited for applications involving paper mill rollers, generator and motor rotors, crankshafts, fans, blowers, and other large rotating components, offering a reliable option for consistent balancing quality in daily operation.
- Min Mass: 100 kg
- Max Mass: 50,000 kg
- Residual Unbalance: 1 g.mm/kg
- Speed: 160 - 2,500 RPM
Build your own balancing machine
With ERBESSD INSTRUMENTS® soft bearing suspensions you can build your own balancing tool and have the same quality. ERBESSD INSTRUMENTS® provides you with the soft bearing suspensions, as well as the analysis system, which is the most critical part. We can provide you with the blueprints for the rest of the parts as well. You will also build your own bedplate and your own balancing machine.
Build your own turbo balancing machine, either on the base of your milling machine or on a station of its own. SBS-30 soft bearing suspensions help you build a very versatile balancer with the high accuracy of soft-bearing systems. Blueprints for the design can be downloaded upon payment of your SBS system.
- Application: Turbo balancing
- Type: Soft Bearing
SBS-300 soft bearing suspensions help you build your own balancing machine without sacrificing the high accuracy of soft-bearing systems. Blueprints for the machine's design can be downloaded upon payment of your SBS system.
- Max Mass: 300 kg
- Type: Soft Bearing
With SBS-1000 soft bearing suspensions, you will manufacture one of the most versatile balancing machines available. The SBS-1000 allows you to balance anything from small 3 kg rotors to medium sized 1,000 kg rotors. Blueprints for the design can be downloaded upon payment of your SBS system.
- Min Mass: 3 kg
- Max Mass: 1,000 kg
- Residual Imbalance: 5 mg
- Speed: 450 - 5,000 RPM
- Type: Soft Bearing
SBS-2000 allows you to create a balancer for large rotors weighing up to 2,000 kg. It supports balancing jobs in two planes as well as in a single plane and cantilever. Assemble the bedplate with the desired length so you are not limited by rotor size.
- Min Mass: 7 kg
- Max Mass: 2,000 kg
- Residual Imbalance: 10 mg
- Speed: 450 - 3,000 RPM
- Type: Soft Bearing
SBS-4500 lets you balance large rotors. The base is simple to assemble and features the well-known precision of soft-bearing rotor balancing machines at a very affordable price. Blueprints for the design can be downloaded upon payment of your SBS system.
- Min Mass: 150 kg
- Max Mass: 4,500 kg
- Residual Imbalance: 80 mg
- Speed: 350 - 3,000 RPM
- Type: Soft Bearing
SBS-6000 lets you balance large rotors. The base is easy to assemble, so you should not have any problem starting work right away. Features the precision of soft-bearing rotor balancing machines at a very affordable price.
- Min Mass: 150 kg
- Max Mass: 6,000 kg
- Residual Imbalance: 80 mg
- Speed: 350 - 3,000 RPM
- Type: Soft Bearing
SBS-10T lets you balance large rotors. The frame is simple to put together, so you should be up and running in a short time. It features the well-known precision of soft-bearing balancing machines at a very affordable price. Blueprints for the rotor balancing machine can be downloaded upon payment of your SBS system.
- Min Mass: 200 kg
- Max Mass: 10,000 kg
- Residual Imbalance: 120 mg
- Speed: 350 - 2,500 RPM
- Type: Soft Bearing
Erbessd's SBS-25T suspensions are meant for large equipment, allowing you to balance very large rotors. The frame is easy to assemble using the blueprints we provide. It features the well-known precision of soft-bearing balancing machines at a very affordable price. Blueprints can be downloaded upon payment of your SBS system.
- Min Mass: 400 kg
- Max Mass: 25,000 kg
- Residual Imbalance: 200 mg
- Speed: 120 - 1,800 RPM
- Type: Soft Bearing
Frequently asked questions
Do the balancing machines need a special foundation?
No. Ours are soft-bearing machines, which let the rotor spin about its centre of mass rather than its geometric centre. A floor that carries the weight and is roughly level is enough.
They are in fact considered portable: some customers take 50-tonne machines to site rather than transport the turbines — they set the balancer next to the structure, run the rotor, balance it and reinstall it straight away.
Which is more accurate, soft bearing or hard bearing?
Soft bearing, because of its freedom of movement. Hard-bearing machines are used more in automated installations and series production, where the priority is cycle time rather than the last increment of accuracy.
Do I have to balance at the rotor’s operating speed?
No. Soft-bearing suspensions let you balance at a fraction of the operating speed, as long as it stays above the system’s resonance frequency. The quality grade is calculated for the full operating speed regardless.
What is the largest balancing machine you sell?
Up to 50 tonnes. Above that, our design team assesses the case according to the intended use.
Can crankshafts be balanced?
Yes, following the correct technique. Crankshafts require bob weights at every point where a piston acts, to emulate its mass. The masses are defined by the engine manufacturer, not by the balancing machine.
How do I know the balance is within standard?
The software calculates the residual unbalance and compares it against the ISO quality grade for that type of rotor, showing it on the standard’s chart. You do not finish “when it vibrates little”: you finish when the number falls inside the required grade.
Is it easy to generate a balancing report?
Yes — one click generates the complete report, with the initial and final state of the process.
Can I balance if I have no optical sensor or tachometer?
Yes, with the four-run (4-Run) method: it balances by measuring amplitude only, with no phase reference. It is slower — there are more runs — but it solves the case where reflective tape cannot be fitted or the shaft is out of reach.
Can I balance in three planes?
Yes. The software does one, two and three planes, plus the Wizard and the four-run method.
What if the rotor’s vibration will not come down no matter how much weight I add?
It is almost never unbalance. The usual causes are resonance — the rotor or its structure has a natural frequency near operating speed — mechanical looseness, or a bent shaft.
At that point the right tool is not balancing but a bump test and phase analysis, and both are in the same software.
Does the EI WiSER® 1X work for balancing?
Yes. The EI WiSER® 1X has 2 channels: one for the internal accelerometer and one for the optical sensor, with the same connector as the 3X.
Both sensors balance in one, two and three planes with the corresponding licence (Digivibe MX® for more than one plane). With them, multi-plane balancing means moving the sensor from one plane to the other on each run and recording once per plane.
With the GX-400 that is not necessary: it takes two independent accelerometers, one per plane, so a single recording per run is enough.
Can the EI WiSER® 3X and 1X be used with Digivibe MX®?
Yes. The EI WiSER® family and the GX-400 work in both Digivibe MX® and WiserVibe: they are sibling applications sharing the same code — WiserVibe for mobile, Digivibe MX® for Windows PCs.
Can the GX-400 interface be used with mobile devices?
Yes. Being a wired interface, it connects to the device through a USB adapter: USB-C for Android and recent iPhone/iPad, Lightning for earlier iPhones.
How far away can I place the laser (optical) sensor?
From 15 cm up to 5 m.
You need to fit a piece of reflective tape — red is recommended — and check that the blue LED on the back lights up each time the beam crosses the tape.