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BalanceMaster, Inc.
2246 Toll Gate Road
Concord, VA 24538
USA
434-993-9182 (voice)
434-993-3280 (fax)
send Email
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The two primary factors to determine the permissible unbalance
(also called the balancing tolerance) are the weight of the rotating
part (mass) and the highest operational speed.
Based on experimental data, the potential for damage due to
unbalance can be expressed as "Balancing Quality Grade", or
G.
The EasyBalance
instrumentation system has a built-in ISO balancing quality
calculator. Just enter rotor weight, service speed and desired ISO
quality (G number), and click CALCULATE
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| Balance
quality grades are standardized in ISO 1940. |
Balance quality grade
G
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Vibration velocity in
mm per second
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Rotor types
General examples
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| G 100 |
100 |
Crankshaft drives of
large Diesel engines
Complete engines for trucks and locomotives |
| G 40 |
40 |
Crankshaft drives for engines of trucks and
locomotives |
| G 16 |
16 |
Parts of crushing machinery
Parts of agricultural machinery |
| G 6.3 |
6.3 |
Fly-wheels
Fans
Aircraft gas turbine rotors
Electrical armatures
Process plant machinery
Pump impellers |
| G 2.5 |
2.5 |
Machine-tool drives
Turbo compressors
Small electric armatures
Turbine-driven pumps |
| G 1 |
1 |
Grinding machine drives
Textile bobbins
Automotive turbochargers |
| G 0.4 |
0.4 |
Gyroscopes
Disk-drives
Spindles for high-precision applications |
The smaller the number, the smoother the
operation
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