To determine whether the fault of the CNC band saw paper cutter is serious, we should do a Comprehensive Fault Severity Assessment according to the following aspects:

Operational Symptom Analysis of Fault Severity Assessment

• • Critical failure indicators:
    • Complete system shutdown (emergency stop activation)
    • Uncontrolled motion exceeding ±0.5mm positional tolerance
    • Abnormal vibration (>4.5 m/s² RMS acceleration)
    • Thermal anomalies (bearing temperatures exceeding 70°C)
  • Performance degradation markers:
    • Cutting accuracy deviation >0.2mm/m
    • Surface finish quality drop (Ra >3.2μm)
    • Feed rate reduction >15% from baseline

Production Impact Evaluation

Severity classification matrix:

Safety Risk Assessment

1. Hazard potential evaluation:
   • Immediate safety threats (Category 1):
     • Electrical arcing visible
     • Guarding system failure
     • Blade tension loss
   • Potential hazards (Category 2):
     • Hydraulic leaks (>50ml/min)
     • Unusual friction sparks
     • Control system lag >0.5s

Technical Complexity Scoring of Fault Severity Assessment

Repair difficulty index (1-10 scale):

• • 1-3: Basic adjustments (tracking, tension)
  • 4-6: Component replacement (guides, motors)

7-10: System-level repairs (CNC board, servo drives)

Diagnostic Data Interpretation

• • CNC system error code analysis:
    • Priority 1: Axis drive faults (E-stop conditions)
    • Priority 2: Servo following errors (>0.1mm)
    • Priority 3: Peripheral warnings (coolant flow)

Maintenance Cost Estimation of Fault Severity Assessment

Cost severity thresholds:

Historical Performance Correlation

Fault pattern recognition:

• • Recurring faults within 100 operating hours
  • Progressive performance deterioration trends
  • Maintenance history review (last 3 interventions)

Decision Matrix for Maintenance Response:

1. Immediate Shutdown Required (Red Zone):
   • Safety Category 1 hazards
   • Critical production impact
   • CNC system catastrophic errors
2. Scheduled Repair Recommended (Yellow Zone):
   • Moderate production impact
   • Technical complexity score 4-6
   • Medium cost threshold
3. Monitoring Advisable (Green Zone):
   • Minor performance deviations
   • Low cost/complexity repairs
   • Non-safety related warnings

Implementation Protocol:

1. Conduct real-time OEE (Overall Equipment Effectiveness) measurement
2. Perform root cause analysis using 5Why methodology
3. Verify with vibration analysis (FFT spectrum comparison)
4. Cross-check against manufacturer’s fault tree diagrams

Note: Always prioritize safety interventions before production considerations. For complex faults, recommend thermal imaging analysis and ballbar testing to verify machine geometry. Maintain detailed fault logs including exact timestamps, environmental conditions, and operator observations.