16K20 lathe: gear teeth restored, longer gearbox service life

The bearing unit shaft steadied, scoring on the gear teeth disappeared, the machine ran quieter. Russia · 2008. 40 % — axial run-out of the bearing unit shaft.

JSC Perm Scientific and Industrial Instrument Making Company · approved by production director V. A. Ryaposov; work and measurements — chief mechanic A. I. Kharitonov, chief engineer of the Chief Mechanic Service S. M. Vorotnikov

Perm, Russia · work 01.10–28.11.2007 · report approved 18.02.2008

PRODUCTXADO revitalizant gelfor compressors and bearings · three doses of 4 tubes at 10 h intervals into a 10 l oil bath

TREATED UNITGearbox of the headstock
drive16K20 lathe, No. 3011588 · gear trains and shaft bearing unit

DOCUMENT TYPERestorative repair report,
JSC PNPPK, two seals

Key result

↓40%

axial run-out of the bearing unit shaft, 0.05 → 0.03 mm

EQUIPMENT	CONDITION AT THE START OF WORK	WHAT WAS MEASURED
16K20 lathe, No. 3011588	In service since 1981; longitudinal scoring and pits up to 0.2 mm deep on the gear teeth	Run-out of the bearing unit shaft, no-load current of the electric motor, condition of the tooth working surfaces

Run-out of the bearing unit shaft

PARAMETER	BEFORE TREATMENT	AFTER 400 H OF OPERATION
Axial run-out	0.05 mm	0.03 mm
Radial run-out	0.02 mm	0.01 mm

Measured with a dial indicator graduated in 0.01 mm.

No-load current of the machine's electric motor

PHASE	BEFORE TREATMENT	AFTER 400 H OF OPERATION
Phase A	7 A	7.3 A
Phase B	8 A	7.3 A
Phase C	8 A	7.8 A

According to the conclusions of the report, reduced friction in the bearings lowered the current drawn by the motor phases.

Working surfaces of the gear teeth

PARAMETER	BEFORE TREATMENT	AFTER 400 H OF OPERATION
Condition of the teeth	Longitudinal scoring and pits up to 0.2 mm deep	A strong metal-ceramic layer formed at the contact areas, scratches and micro-pits disappeared, a characteristic sheen appeared

Inspection during disassembly of the gearbox. The report also notes reduced noise during machine operation.

Conclusions of the report

Before treatment the machine had been in service for more than a quarter of a century, and the gearbox teeth carried longitudinal scoring and pits up to 0.2 mm deep. The commission of JSC Perm Scientific and Industrial Instrument Making Company recorded: 1. As a result of the treatment, the strength of the working surfaces of the gear teeth increased, which leads to a longer service life of the machine. 2. Reduced friction in the bearings lowered the current drawn by the motor phases. 3. The run-out of the bearing unit shaft decreased. 4. It is advisable to use XADO products as standard lubricants for machine tools and process equipment.

The results refer to the gearbox of the headstock drive of a 16K20 lathe and to the stated treatment procedure; on other equipment and under different operating modes the figures may differ. The original report with signatures and seals is published in full and available for download.

Current equivalent

Revitalizant gel for gearboxesGearboxes · transmissions · gear drives
Revitalizant gel for compressors and bearingsCompressors · bearings · spindles

How such units are treated: Gearbox Gear drive Bearings

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