Free Engineering Tool
Hammer Mill Balance Calculator
Check if your hammer arrangement is balanced. Enter hammer masses for each position and disc to compute unbalance and get redistribution recommendations.
Results
Balance Principle
For a rotor with N equally-spaced circumferential positions, each position has an angular direction. The vector sum of all mass × direction vectors should ideally be zero:
Where Mi is the total mass on position i, and θi = (i-1) × 360°/N is the angular position.
Unbalance Vector
The magnitude of U represents the net unbalance in kg. If the rotor has hammer CG radius R, the static unbalance moment is U × R (in kg·mm).
Balance Criterion
A hammer rotor is considered adequately balanced when:
- Max position difference < 2% of total hammer mass
- For 2-position rotors: opposing positions should have equal total mass
- For 4-position rotors: pairs (1,3) and (2,4) should match
- For 3 and 6 positions: vector sum check is essential
Practical Example
Position 1: 5.0 + 5.0 + 5.0 + 5.0 = 20.0 kg
Position 2: 5.0 + 5.0 + 5.0 + 5.0 = 20.0 kg
Position 3: 5.0 + 5.0 + 5.0 + 5.0 = 20.0 kg
Position 4: 5.0 + 5.0 + 5.0 + 5.0 = 20.0 kg
Total = 80.0 kg, Max diff = 0.0 kg (0%) → Balanced ✓
⚠️ Note: This calculator checks static balance only (weight distribution). Dynamic balance also depends on axial mass distribution. For high-speed rotors, professional balancing with vibration measurement is recommended.
Professional rotor balancing for hammer mills and crushers. On-site dynamic balancing reduces vibration by 80–95%. Used in 50+ countries.
Nikolai Shelkovenko
Nikolai Shelkovenko is a vibration analysis engineer and the founder and CEO of Vibromera. For more than 15 years he has balanced rotating equipment in the field rather than on a test bench: mulchers, industrial fans, crushers, centrifuges, shafts and spindles. That work is what the Balanset instruments grew out of — they were designed as a tool a specialist can carry to the machine and use alone, on site, not as laboratory equipment. Vibromera was founded in 2017 and has been based in Porto, Portugal, since 2023. Development, assembly and support of the Balanset line all happen here. The flagship instrument is the Balanset-1A, a portable analyser for single- and two-plane balancing and for vibration diagnostics. Nikolai is personally involved in customer support, in working through difficult balancing cases and in the development of the software. He works with customers worldwide, in any language.
