Key Recommendations for Purchasing Used Industrial Robots

Key Recommendations for Purchasing Used Industrial Robots

When considering pre-owned industrial robots, follow these critical guidelines to mitigate risks and ensure optimal performance:

1. Source from Reputable Suppliers

• Priority: Purchase exclusively from established vendors (recognized companies or certified resellers with proven track records)

• Due Diligence: Verify seller credentials through industry references or platform ratings

2. Comprehensive Physical Inspection

• Mechanical Components:
  ✓ Check for missing/damaged parts (end effectors, mounting hardware)
  ✓ Inspect motors and reducers for wear/backlash
  ✓ Measure joint play – excessive clearance indicates gearbox issues

• Structural Integrity:
  ✓ Examine for collision damage or frame deformations

3. Control System Verification

• Teach Pendant:
  ✓ Test all HMI buttons and touchscreen responsiveness
  ✓ Verify cable insulation integrity (especially at stress points)

• I/O Configuration:
  ✓ Confirm presence of functional I/O boards (minimum 16 digital I/O)
  ✓ Check fieldbus module compatibility (Profibus, DeviceNet, etc.)

4. Transaction Terms Assessment

• Avoid "As-Is" Auctions:
  ✓ Reject listings with no inspection/testing provisions
  ✓ Require minimum 30-day functional warranty

• Age Thresholds:
  ✓ Maximum recommended age: 8 years for articulated robots
  ✓ Critical cutoff: Discontinued models exceeding 10 years

5. Documentation Requirements

• Mandatory Manuals:
  ✓ Robot controller manuals (original PDF versions)
  ✓ Peripheral equipment documentation (vision systems, EOAT)

• Software Archives:
  ✓ Obtain legacy software versions (e.g., KRL 2.0 for KUKA KRC2)

6. Spare Parts Availability

• Supply Chain Verification:
  ✓ Maintain list of 10+ critical components (harmonic drives, encoders)
  ✓ Validate lead times with 3+ authorized distributors

• Obsolescence Management:
  ✓ Cross-reference with manufacturer's lifecycle reports

7. Manufacturer Policy Review

• Recommissioning Costs:
  ✓ Audit potential fees for:
  • Software license transfers
  • Safety certification renewals

• Service Limitations:
  ✓ Confirm OEM support availability for refurbished units