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A used servo press can be a great investment or an expensive mistake.
## 1. Total Stroke Count
Most drives log total stroke count in non-resettable memory. Compare to manufacturer recommended overhaul interval, typically 5-10 million strokes.
## 2. Drive and Motor Hours
Check total powered hours, run hours, and fan hours. A drive with 40,000 hours needs new cooling fans immediately.
## 3. Alarm History
Download the drive alarm history. Look for repeated encoder faults, repeated overload faults, and any faults that were never resolved.
## 4. Gib Clearance
Measure at top, middle, and bottom of slide travel. Compare to manufacturer new-machine specification.
## 5. Slide Parallelism
Acceptable: under 0.02mm per 300mm. More than this indicates worn gibs or a crashed machine.
## 6. BDC Repeatability
Run 50 strokes with a dial indicator. Target: variation under 0.02mm.
## 7. Motor Insulation Test
Megger at 500V DC. Acceptable: over 100 megaohm.
## 8. Oil Analysis
Metal particle content tells you bearing condition better than any visual inspection.
## 9. Software and Parameters
Verify drive software is still supported and all parameter files are available.
## 10. Spare Parts Availability
Check availability for servo drive, encoder, main motor, and control board. If the drive model is discontinued factor in a retrofit cost of 30,000 to 80,000 USD.