INDUSTRIAL CASE|MECHANICAL ENGINEERING · AEROSPACE|METALWORKING MACHINE TOOLS · BEARINGS
TECHNICAL REPORT OF THE PERM MOTOR PLANT
RT-2000 CNC lathe: noise and seizing eliminated, spindle bearing not replaced
PRODUCTXADO greases“XADO Repair” — 10 kg into the spindle bearing · then “XADO CV Joint”
TREATED UNITSpindle bearingRT-2000 “Volenberg” special CNC lathe (Germany) for double-sided machining of disks
DOCUMENT TYPETechnical report
of the Perm Motor Plant
of the Perm Motor Plant
Key result
↓4×
spindle bearing runout at the end of the work shift, 0.06 → 0.015 mm
| EQUIPMENT | CONDITION AT THE START OF WORK | WHAT WAS MEASURED |
|---|---|---|
| RT-2000 “Volenberg” CNC lathe, in service since 1992 | Knocking and cases of seizing in the spindle bearing; over a shift the runout grows from 0.01 to 0.06 mm | Spindle bearing runout; noise at idle and under load |
RT-2000 spindle bearing — before and after treatment
| PARAMETER | BEFORE TREATMENT | AFTER TREATMENT |
|---|---|---|
| Spindle bearing runout, end of work shift | 0.06 mm | not more than 0.015 mm |
| Bearing noise at idle and under load | Knocking | Eliminated |
Before the treatment the runout grew during the shift from 0.01 to 0.06 mm; the noise was assessed by ear.
Conclusion of the plant report
The CNC lathe, which by that time had been running for about twenty years, had come close to spindle failure: from October 2011 knocking was audible, seizing occurred, and over a work shift the runout grew from 0.01 to 0.06 mm. The bearing was neither disassembled nor replaced — the lubrication system was flushed with kerosene and 10 kg of “XADO Repair” grease was added, after which the machine was run for 80 h without load. The technical report of the Perm Motor Plant records: <b>as a result of the work performed, the bearing noise at idle and under load has been eliminated, and the bearing runout at the end of the work shift does not exceed 0.015 mm</b>. After 200 h of machine operation under working conditions, the bearing was flushed with kerosene and “XADO CV Joint” grease was added, and the machine was handed over to the production shop.
The results refer to the spindle bearing of the RT-2000 “Volenberg” special CNC lathe under the conditions of the Perm Motor Plant; on other units and operating modes the figures may differ. The original technical report is published in full and available for download.
Current equivalent
Revitalizant gel for compressors and bearings →
Piston, screw and centrifugal compressors; rolling and sliding bearings running in an oil bath; machine-tool spindle units and slideways.
How such units are treated: