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 NZ2000 Spindle Repair
The Mori Seiki NZ2000 is perfect for high production turning with three turrets and two spindles. The spindle we repaired is grease lubricated and stator driven capable of running up to 4,000 rpm.
Our customer sent us this spindle because of vibration and poor part finish during operation. Upon disassembly we found that the front quad bearing set was lightly contaminated with cutting oil, and the grease was starting to discolor. The 110mm shaft rotor journal was fretted -20µ where the front of the rotor locates. Lastly, the front of the rotor ID was lightly fretted.
The following actions were performed on this Mori Seiki NZ2000 spindle:
- Clean, inspect overall dimensions
- Grind, chrome plate, and finish grind 110mm shaft rotor journal
- Replace bearings, 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.
DETAILED CAUSE OF FAILURE
Yellowed grease that shows slight contamination from part coolant
Picture of the shaft where the fretting from the loose rotor occurred. The rusted looking area is the spot.
Close up of damaged shaft. The fretting caused the shaft to become 20 microns undersized.
This is the inner diameter of the rotor. Same evidence of fretting.
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