INDUSTRIAL CASE|MECHANICAL ENGINEERING · AEROSPACE|METALWORKING MACHINE TOOLS · BEARINGS

IE A027TECHNICAL REPORT OF THE PERM MOTOR PLANT

RT-2000 CNC lathe: noise and seizing eliminated, spindle bearing not replaced

Spindle bearing runout dropped sharply, knocking and seizing stopped, the bearing was not replaced. RT-2000 CNC lathe, Perm Motor Plant. Russia · 2012. 4×.

Perm Motor Plant · report signed by A. V. Drachev, Deputy Chief Mechanical Engineer for Operation

Perm, Russian Federation · fault recorded in October 2011 · report dated 20.11.2012

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

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: Bearings

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