Here’s a professional-grade guide to what experts check before purchasing a used/pre-owned TITAN SC 22 CNC Double Column Vertical Turning Lathe (made in Romania). This type of machine is a large VTL (vertical turning lathe) designed for heavy workpieces, often with table diameters around ~2000 mm and swing diameters up to ~2200 mm.

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1. Technical & Mechanical Condition

✅ General Structural Inspection

• Columns, guideways and castings:
Check for cracks, repair marks, excessive wear, or signs of poor maintenance — these are critical for rigidity and precision.
• Table and spindle assembly:
Verify runout, lubrication status, backlash, and whether the table rotates smoothly under load. For heavy workpieces, table balance and drive condition are vital.

✅ Precision Components

• Linear guides, ball screws, bearings:
Wear here degrades accuracy and increases rejection rates. Have them measured by a technician if possible.
• Control system & DRO (Digital Readout):
If equipped with a DRO or CNC controller (e.g., NUM 720), check screen operation, axes homing, backlash compensation and error history.

✅ Drive & Electrical Systems

• Motors & drives:
Inspect servo motors, cables, drives, and cooling. Older electrics can be expensive to replace.
• PLC/CNC software version:
Legacy software might lack support or compatibility with modern CAM systems. Confirm upgrade paths.

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2. Operational Performance

✅ Test Running

• Live trial machining:
Run sample parts under real load; check surface finish, cycle time, and thermal stability.
• Idle tests:
Watch for unusual vibration, noise, or axis lag — signals of hidden faults.

✅ Accuracy & Repeatability

• Geometric inspection:
Measure straightness, circularity, and repeatability after extended cycling to ensure precision.
• Tooling alignment:
Verify turret or ram alignment with the table center; misalignment increases scrap.

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3. Documentation & History

✔ Maintenance Records

• Previous servicing, parts replaced, breakdown records — these directly affect reliability and resale value.

✔ Usage Log

• Hours counter and workload history (continuous heavy use vs. light use) provide clues about future lifespan.

✔ Certifications & Compliance

• CE marking or other conformity documents can ease export/import and legal use in regulated industries.

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4. Seller Verification & Warranty

✔ Seller Reputation

• Choose professional dealers or sellers with references — avoid unclear ownership history.

✔ Inspection Guarantee

• Prefer sellers offering independent inspection or short warranty on major components.

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5. Total Cost of Ownership

Price vs Condition

• Compare similar machines on the market — SC 22 lathes vary in price depending on condition, control type, and service history.

Transport, Installation & Retrofit

• Heavy VTLs require specialized rigging and installation planning. Factor in logistical costs before purchase.

Parts & Service

• Confirm availability of spare parts for BOTH mechanical and electronic systems (older CNCs might require custom parts).

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6. Fit for Application

Compatibility with Production Needs

• Max swing, table diameter, turning height (~2200 mm × 1500 mm typical) must match your workpiece dimensions.
• CNC axis capabilities should deliver the tolerance and surface finish your parts require.

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Quick Professional Checklist

Area	Essential Checkpoints
Structural	Cracks, wear, alignment
Precision	Guideways, backlash, DRO/CNC function
Electrical	Motor, drives, cabling, control software
History	Service records, hours, usage
Performance	Test run, accuracy tests
Documentation	Manuals, certifications
Logistics	Transport, install, leveling
ROI	Spare parts & service availability

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Pro Tip

Always have a trusted technical inspector or CNC specialist evaluate the machine onsite before finalizing the purchase — sight unseen purchases of large VTLs are risky due to hidden wear that can drastically increase refurbishment costs.