IE S033REPORT ON A DEMONSTRATION RESTORATIVE REPAIR
16K20 lathe: gear teeth restored, longer gearbox service life
The bearing unit shaft ran more smoothly, scoring on the gear teeth disappeared, machine noise fell. 40 % — axial run-out of the bearing unit shaft, 0.05 → 0.03 mm (2008).
drive16K20 lathe, No. 3011588 · gear trains and shaft bearing unit
JSC PNPPK, two seals
Key result
| 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
Current equivalent
- Revitalizant gel for gearboxesGearboxes · transmissions · gear drives
- Revitalizant gel for compressors and bearingsCompressors · bearings · spindles
How such units are treated:
Limits of this report: 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.