G0.4 vs G2.5: Why Dynamic Balance Matters at High RPM
Direct answer: A lower balance grade number represents a tighter permitted residual unbalance under the relevant standard. At high RPM, balance affects vibration, bearing load, tool-holder behavior, and surface finish.
What to request from a supplier
| Question | Evidence |
|---|---|
| Which standard? | Stated balance standard and grade |
| At what speed? | Test speed and operating range |
| What was tested? | Rotor, shaft, holder, or complete assembly |
| What report? | Model- or serial-linked balance record |
Do not rely on a marketing label without the test object, speed, method, and report. Connect this guide to the 9kW ISO30 product page and the Engineering Center.
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