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Rotor Balancing Catalog — Field Balancing for Every Rotating Machine

Every category in this catalog describes how we balance a specific rotor type in place, at operating speed — using the Balanset-1A portable analyzer. No dismounting, no shipping, no production stop longer than the time it takes to fit two sensors. Choose your equipment below.

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Balanset-1A complete portable field-balancing kit with sensors, laser tachometer and transport case

In short: Field rotor balancing is the process of correcting residual mass imbalance in a rotating machine without removing it from its installation — the rotor runs at operating speed while vibration sensors and a laser tachometer on the shaft measure the unbalance state. The Balanset-1A applies the 3-run influence-coefficient method to calculate the exact correction mass and angle, then documents the result to ISO 21940-11. A typical job takes under one hour and reduces vibration by 70 % or more, multiplying bearing life by a factor of eight to ten.

Complete service directory

Select your rotor type to see the dedicated balancing guide — symptoms, step-by-step procedure, tolerances, real cases and the right calculator.

Fans & air movers

In-situ balancing of an industrial fan impeller at operating speed

Fans, Impellers & Blowers

Industrial fans, radial impellers, exhausters and blowers balanced at running speed.

Two-plane field balancing of a large industrial ID fan at operating speed

Industrial Fans (ID / FD)

Induced- and forced-draft boiler fans — two-plane balancing without an outage.

Axial fan rotor being balanced in-situ at operating speed inside the duct

Axial Fans

Vane- and tube-axial fans — blade-pitch and build-up issues corrected in situ.

Industrial exhauster fan being balanced in-situ at operating speed on a plant site

Exhausters & Draft Fans

Hot, dusty boiler-house draft fans balanced in place without shutdown.

Cooling tower fan balancing in place at operating speed with Balanset-1A

Cooling Tower & HVAC Fans

Large low-speed fans — cut noise, protect gearboxes and belts.

Industrial rotors

Pump impeller being balanced in-situ at operating speed

Pumps & Impellers

Centrifugal and vacuum-pump impellers after cavitation, erosion or scale build-up.

In-situ field balancing of a high-speed separator rotor with Balanset-1A

Separators & Centrifuges

High-speed separator and centrifuge rotors balanced in place to G1.0.

Crusher and mill rotor balancing on site with Balanset-1A

Crushers & Mills

Impact, jaw and hammer-mill rotors after wear or refurbishment.

Two-plane field balancing of an industrial drive shaft using Balanset-1A

Driveshafts, Pulleys & Flywheels

Cardan / drive shafts and sheaves balanced in-vehicle or in-place.

Roll and drum in-situ field balancing on a production line with Balanset-1A

Rolls & Drums

Paper-machine rolls, coating rollers and process drums.

Turbines & Turbochargers

High-speed flexible rotors — ISO 20816 vibration evaluation and balancing.

Precision & high-speed

CNC spindle and HSK toolholder balancing with Balanset-1A at operating speed

CNC Spindles & Toolholders

High-speed machine-tool spindles to fine G2.5 / G1.0 balance grades.

Electric motor armature dynamic balancing with Balanset-1A

Electric-Motor Armatures

Motor armatures and rotor assemblies balanced in-situ to reduce vibration and noise.

Drone propeller and rotor dynamic balancing

Propellers & Drone Rotors

Propeller and drone-rotor balancing to eliminate destructive vibration.

Gyroscopes

Precision gyroscope rotor balancing to strict angular-tolerance grades.

Hydraulic coupling and flywheel field balancing

Couplings & Flywheels

Hydraulic and mechanical coupling balancing in place.

Agricultural machinery

Field balancing of a combine harvester threshing drum with Balanset-1A at operating speed

Combines & Harvesters

Threshing drums, choppers and fans balanced in the field before harvest season.

Forestry mulcher rotor balancing in the field

Mulchers & Flail Mowers

Forestry mulcher and flail-mower rotors — restore smooth cutting after blade change.

Auger and screw conveyor being balanced on site at operating speed

Augers & Screw Conveyors

Long slender feed augers and grain-blower rotors.

Methods & tools

Two-Plane (Dynamic) Balancing

Long rotors where unbalance is distributed along the shaft — two-plane correction method explained.

Diagnosing and eliminating machine vibration on site with Balanset-1A

Eliminate Machine Vibration

Diagnostic approach — identify and eliminate the vibration source step by step.

Vibration Analyzer & FFT

Using the Balanset-1A as a standalone FFT spectrum analyzer for diagnostics.

Portable Balanset-1A field balancer versus a stationary shop balancing machine

Balancing Machine vs. Portable Kit

When a workshop machine is the right choice and when a portable analyzer beats it.

Balanset-1A balancing kit at vibrometer price point — full capability review

Buy a Portable Balancer

Full kit, price, shipping and what to expect — the complete buying guide.

Balanset-1A portable two-channel balancer and vibration analyzer kit

Balanset-1A vs. Alternatives

Honest side-by-side comparison against other portable balancing instruments.

Old hard-bearing balancing machine retrofitted with Balanset-1A modern measuring system

Upgrade an Old Balancing Machine

Replace the electronics of a worn workshop machine with a modern USB measurement unit.

Field rotor balancing guide using Balanset-1A

Field-Balancing Guide

Complete practical guide — theory, practice and problem-solving with the Balanset-1A.

Why field (in-situ) balancing?

Traditional rotor balancing requires pulling the machine from the line, shipping it to a workshop, and reinstalling it — days of downtime. Field balancing cuts that to a sensor-mounting and two or three measurement runs at operating speed:

No dismounting. The rotor stays in its own bearings, housing and alignment.

At real operating speed. Corrections are made under actual centrifugal loads and temperatures.

Full-assembly balance. Shaft flex, coupling offset and thermal effects are all accounted for automatically.

One or two planes. From simple disc rotors to long shaft assemblies needing two-plane dynamic correction.

ISO 21940-11 tolerances. Residual unbalance is verified and documented against the required quality grade.

Under an hour. A typical single-plane job — from sensor fitting to final run — takes under 60 minutes.

×8–10bearing life gain when vibration is halved (ISO 281)

−70%typical vibration reduction after one session

2planes corrected in a single visit

<1 htypical on-site time, single-plane rotor

How field balancing works — the universal process

Regardless of the rotor type, every field-balancing job with the Balanset-1A follows the same systematic influence-coefficient procedure:

Fit the sensors. A vibration accelerometer is attached to the bearing housing and a laser tachometer is aimed at a reflective strip on the shaft. No disassembly is required.
Record the baseline. One run at full operating speed captures vibration amplitude and phase angle, defining the current unbalance vector.
Add a trial weight. A known calibration mass is temporarily clamped at a known angular position. A second measurement run determines the rotor’s sensitivity — the influence coefficient.
Calculate the correction. The Balanset-1A software applies the influence-coefficient algorithm to compute the exact correction mass and angle for one or both planes.
Apply the correction. The calculated mass is welded, bolted or clamped at the indicated position. The trial weight is removed unless it forms part of the solution.
Verify and document. A final measurement run confirms residual unbalance is within the required ISO grade. The device generates a printable balancing report.

The influence-coefficient method (3-run method) is the only approach that accounts for every source of asymmetry in the assembled rotor system — manufacturing, wear, deposit build-up, shaft flex and coupling misalignment alike. It requires no prior knowledge of rotor geometry or mass distribution.

The Balanset-1A — your complete field-balancing kit

Every service in this catalog is carried out with one portable instrument: the Balancet-1A. It is a two-channel dynamic balancer and vibration analyzer that balances rigid rotors in their own bearings, at operating speed, using the 3-run influence-coefficient method — the software calculates the exact correction mass and angle and saves a report.

Complete Balanset-1A balancing kit with sensors, laser tachometer, scale and transport case

What’s in the Full Kit

€1,975 · Full Kit, in stock, VAT invoice

Interface measurement unit (USB, 2 channels)
Two vibration accelerometers (4 m cable, 10 m optional)
Laser tachometer / optical phase sensor (50–500 mm)
Magnetic stand for the sensor
Digital scale for trial & correction weights
Windows balancing & analysis software
Plastic transport case

View the Balanset-1A Ask our engineer

Recommended

Full Kit

Unit · 2 sensors · laser tachometer · magnetic stand · digital scale · software · transport case. Everything needed to start balancing out of the box.

OEM

OEM set

Unit · 2 sensors · laser tachometer · software. For integrators who already have a stand, scale and case, or who embed the unit into a balancing machine.

Key technical specifications
Parameter	Value
Measurement channels	2 (single- & two-plane balancing)
Vibration velocity range	0.05–100 mm/s
Frequency range	5–300 Hz
Measurement accuracy	±5% of full scale
Method	3-run influence-coefficient (1 or 2 planes)
Analysis	Amplitude & phase at 1×, FFT spectrum & waveform, saved reports
Laptop	Not included (Windows PC, available on request)

✓ In stock✓ DHL Portugal €35✓ DHL worldwide €110✓ 2-year warranty✓ VAT invoice✓ Engineer support

Standards we work to

ISO 21940-11 (formerly ISO 1940-1) defines rigid-rotor balance quality grades G0.4 through G4000. The permissible residual unbalance for a given grade is e = G × 9549 / n (g·mm/kg), where n is the shaft speed in rpm. Typical grades by rotor type:

G0.4 – G1.0 — gyroscopes, precision grinding spindles, dental turbines
G2.5 — CNC spindles, centrifugal pump impellers, gas-turbine rotors
G6.3 — centrifugal fans, industrial pump impellers, normal electric motors
G16 — agricultural machinery, cardan shafts, crushers
G40 — combine threshing drums, large flywheels

ISO 20816 (vibration severity) and ISO 14694 (industrial fans) provide the in-situ vibration limits against which a balancing result is evaluated on-machine. API 610 governs centrifugal pumps in hydrocarbon service (max residual unbalance 4W/N g·mm). All residual-unbalance figures are documented in the balancing report.

Use our residual-unbalance calculator to find the permissible tolerance for your rotor before starting, or the bearing-life calculator to see how much life you recover by correcting the imbalance.

Free balancing calculators

Centrifugal force from unbalance Residual unbalance (ISO 21940) Trial weight calculator Bearing-life calculator (ISO 281)

Learn the theory

Kusawazisha shamba Dynamic balancing Balance quality grades Residual unbalance Impeller defects Complete field-balancing guide

Field balancing FAQ

What is field (in-situ) rotor balancing?

Field balancing is the correction of residual mass unbalance in a rotor while it remains installed in the machine, running at its normal operating speed. Vibration sensors on the bearing housings and a laser tachometer on the shaft measure the unbalance state; the Balanset-1A calculates the correction mass and angular position required to bring residual unbalance within the tolerance specified by ISO 21940-11. No dismounting, no workshop machine, no pipe disconnections.

Which rotors can be balanced in the field?

Any rigid rotor that can reach operating speed during the balancing session is a candidate for field balancing. This covers the vast majority of industrial rotors: fans, pump impellers, centrifuges, separators, spindles, turbine rotors, drive shafts, rolls, combine drums, augers, flywheels and more. Flexible rotors — long shafts that bow significantly above a critical speed — require multi-plane modal balancing and may need a workshop machine for the first correction plane.

How long does a field-balancing job take?

A single-plane job typically takes under one hour from sensor mounting to the final verification run. Two-plane jobs on larger rotors (wide fans, multi-stage pumps, long drive shafts) usually take one to three hours. The limiting factor is usually access to the shaft for fitting the reflective strip, not the measurement time itself.

Do I need specialist training to use the Balanset-1A?

No. The Balanset-1A is designed for maintenance engineers and technicians without specialist vibration-analysis training. The software guides you step by step through the baseline run, the trial-weight run and the correction calculation, and outputs a plain-language result. Our community forum is available if you encounter an unusual rotor or want to verify your approach. A free field-balancing guide with worked examples is also available on the site.

Single-plane or two-plane balancing — how do I choose?

A rotor can be corrected in a single plane when its axial width is small relative to its diameter and the unbalance is dominated by a static (single-plane) component — most disc-type rotors, impellers and fans fall here. Two-plane (dynamic) balancing is required when the rotor is long relative to its bearing span and carries a couple-unbalance component: wide double-inlet fans, multi-stage pump shaft assemblies, long drive shafts and rolls. The Balanset-1A handles both modes with the same hardware — choose the mode in software before the first run.

What accuracy does field balancing achieve?

With the Balanset-1A (±5% measurement accuracy, 5–300 Hz frequency range), field balancing routinely achieves ISO 21940-11 grades G2.5 and better for rigid rotors. The accuracy of the correction mass placement (angle and radius) is the main practical variable — the software accounts for any angular offset introduced during fitting. Final residual unbalance is confirmed by a verification run and reported in mm/s vibration velocity and in g·mm residual unbalance.

Balance any rotor — in place, at operating speed

The Balanset-1A handles single- and two-plane field balancing for every rotor type in this catalog. One portable kit, one systematic method, ISO-documented results. Ships from Portugal by DHL in 1–3 days.

View the Balanset-1A — €1,975 Ask a question on the forum

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