KEVOS® MAKEOS · Mechanics
Two-Plane (Dynamic) Balance Corrections
What correction masses in two planes give this rotor a running (dynamic) balance?
Correction masses and angles in two chosen correction planes that balance up to three masses lying in different planes along a rotor, by taking moments about one correction plane.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Distance between correction planes A and B | mm | Axial distance between the two correction planes. |
| Masses (axial position measured from plane A) | ||
| Mass 1 | g | First unbalanced mass. |
| Radius 1 | mm | Its radius. |
| Angle 1 | ° | Its angle. |
| Axial position 1 | mm | Its axial distance from plane A (negative if outside, beyond A). |
| Mass 2 | g | Second mass. |
| Radius 2 | mm | Its radius. |
| Angle 2 | ° | Its angle. |
| Axial position 2 | mm | Its axial position. |
| Mass 3 | g | Third mass (0 if unused). |
| Radius 3 | mm | Its radius. |
| Angle 3 | ° | Its angle. |
| Axial position 3 | mm | Its axial position. |
| Correction radii | ||
| Correction radius in plane A | mm | Radius for the correction mass in plane A. |
| Correction radius in plane B | mm | Radius for the correction mass in plane B. |
Method and formulas
- Moments about plane A: U_B = −Σ (mᵢ rᵢ ∠θᵢ) zᵢ ÷ L.
- Forces: U_A = −Σ (mᵢ rᵢ ∠θᵢ) − U_B.
- Correction mass = |U| ÷ correction radius in each plane.
- Example: corrections of 27.042 g in plane A and 19.526 g in plane B.
Limitations
- Rigid rotor below its first critical speed.
- Measured unbalance from a balancing machine is more reliable than calculated item masses.
- Example values are illustrations. Replace them with values for your actual task.
Typical uses
- Work out corrections for a long rotor or roll
- Balance a fixture with offset masses at different heights
- Check bearing loads from couple unbalance
Who it is for
- Maintenance engineers
- Machine designers
- Balancing technicians
What you get
- Correction mass and angle in plane A
- Correction mass and angle in plane B
- Static and couple unbalance
Interpreting the result
- If the correction in one plane is tiny, a single-plane correction may be enough.
References
- Machinery’s Handbook, 29th edition (Industrial Press, 2012), printed pp. 191–195. Topic reference; no source tables or recommended settings are reproduced.
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