PRODUCTION CASE|MECHANICAL ENGINEERING|MACHINE TOOLS · GEARBOXES
COMMISSION REPORT, ZMM METALIK AD
Drilling machine PK 045A: gears ran in, noise down at every speed
Gear trains ran in, gearbox noise decreased at all speed stages. 9 dB — gearbox noise level, 77.3–80.5 → 68–74 dB (2002).
PRODUCTXADO gel for gearboxesadded in three stages at 8-hour intervals, without disassembling the gearbox
TEST OBJECTDrilling machine PK 045Agearbox — gear trains
DOCUMENT TYPECommission report,
ZMM Metalik AD
ZMM Metalik AD
Key results
↓9dB
gearbox noise level,77.3–80.5 → 68–74 dB
| EQUIPMENT | CONDITION AT START OF TESTS | WHAT WAS MEASURED |
|---|---|---|
| Drilling machine PK 045A, gearbox | Elevated noise from gear trains that had not run in | Noise level at nine spindle speed steps, before and after treatment |
Gearbox noise level by spindle speed step
| SPEED, rpm | BEFORE TREATMENT, dB | AFTER TREATMENT, dB | CHANGE, dB |
|---|---|---|---|
| 1169 | 80.5 | 74 | −6.5 |
| 806 | 79.5 | 72 | −7.5 |
| 574 | 78 | 70 | −8 |
| 191 | 77.5 | 69 | −8.5 |
| 269 | 78.4 | 70 | −8.4 |
| 390 | 79 | 68 | −11 |
| — | 77.3 | 68 | −9.3 |
| 123 | 80 | 69 | −11 |
| 85 | 80.2 | 69 | −11.2 |
Measured with a Voltcraft 320 sound level meter at nine spindle speed steps, from 85 to 1169 rpm; a reduction was obtained at every one of them, with 9 dB stated in the conclusion of the report.
Conclusion of the commission
The commission of ZMM Metalik AD recorded: the measurements performed confirm running-in of the gear trains and build-up of a metal-ceramic layer on the friction surfaces, which reduces friction and noise by 9 dB and increases the service life of the gear train. The measurement was made with a Voltcraft 320 sound level meter. Before treatment the machine ran with degraded noise characteristics because the gear trains had not run in — running-in was achieved without disassembling the gearbox and without taking the machine out of service, using a formulation added to the oil in three stages at 8 hour intervals. The noise reduction was recorded at all nine spindle speed steps, from the lowest to the highest. The report is signed by the Deputy Director for Engineering, the Head of QC and the Shop Manager of the plant.
Current equivalent
Revitalizant gel for gearboxes →
Industrial gearboxes, final and central drives, truck and tractor gearboxes, open gear and chain drives.
How such units are treated:
Limits of this report: The results relate to the gearbox of a PK 045A drilling machine at the ZMM Metalik AD site; on other equipment and under different operating conditions the figures may differ.