Catastrophic bearing failure was the main cause of this spindle malfunction Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication……Read More
Mori Seiki NH5000 Spindle Rebuild
The Mori Seiki NH5000 is a CNC horizontal machining center. This specific spindle is oil mist lubricated, stator driven, and capable of running up to 12,000 rpm.
Our customer sent in this Mori Seiki NH5000 spindle indicating that the spindle was making excessive noise during operation. The bearings felt very rough when rotated by hand in assembly incoming. After disassembly and evaluation, we noted that the front bearing quad set was contaminated with a rusty brown sludge. The encoder target wheel had multiple damaged teeth and no coolant plungers were installed. The gripper fingers (collet) had significant damage on critical tool retention surfaces. We then measured the critical dimensions (bearing journals, housing, taper, etc.) and found that the tooling taper ID was pock-marked with damage to the chamfer, poor tool contact, and high runout. It was also noted that the 100mm front housing bore was tapered +2/-7µm. No other dimensional deviations were noted for this repair.
The following actions were performed on this Mori Seiki NH5000 spindle:
- Clean, inspect overall dimensions
- Grind, chrome plate, and finish grind the tooling taper ID
- Kiss grind the 100mm front housing bore
- Replace bearings, target wheel, o-rings, and assembly screws
After reassembly of all components, adjusting bearing preload, and undergoing break-in and testing procedures, this spindle passed our final quality inspection before being returned to our customer with a 1-year warranty.
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More Case Studies
Repair History - Here are examples of similar spindle repairs that may contain additional information that will help you. If you have additional questions, please contact us.
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Downtime is inevitable for any machine, but knowing how to reduce downtime or minimize its likelihood is critical.Read More