PRODUCTION CASE STUDY|MECHANICAL ENGINEERING|METAL-CUTTING MACHINE TOOLS
REPORT ON A DEMONSTRATION RESTORATIVE REPAIR
16K20 lathe: gear teeth restored, longer gearbox service life
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
drive16K20 lathe, No. 3011588 · gear trains and shaft bearing unit
DOCUMENT TYPERestorative repair report,
JSC PNPPK, two seals
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: