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Mazak Quick Turn 250 CNC Turning Center
Yamazaki Mazak · CNC Lathe · Bay 2, Cell B
Documented
2
Total Repairs
115
Avg Fix Time (min)
1
Critical
1
Major
2
Unique Parts Used
Root Cause Summary
- RPR-005Metal chip wedged in Hirth coupling teeth at turret position 8 preventing mechanical lock
- RPR-004Draw tube hairline crack reducing hydraulic clamping force. Would have been missed if hydraulic pressure was simply increased.
Repair Timeline
RPR-004
critical
Chuck grip force measured at 38 kN during PM check — below minimum 45 kN spec. No alarm but parts occasionally shifting in chuck during heavy cuts.
Jan 28, 2026
Kenji Watanabe
Root cause: Draw tube hairline crack reducing hydraulic clamping force. Would have been missed if hydraulic pressure was simply increased.
180 min2 partsSOP-005
RPR-005
major
Turret not indexing to position 8. Alarm 3025 (turret position error). Other positions index fine.
Feb 19, 2026
Kenji Watanabe
Root cause: Metal chip wedged in Hirth coupling teeth at turret position 8 preventing mechanical lock
50 min