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 NVX 5100 Spindle Repair
The Mori Seiki NVX 5100 is a high production CNC vertical machining center. It comes equipped with an oil mist lubricated and stator driven spindle capable of running up to 13,000 rpm.
Our customer indicated that they were experienced noise and poor finish while operating this spindle. They also experienced test bar rock with slow return. Upon inspection, we noted that the bearings were in very poor condition. The bare shaft had 10-20µ runout with a 12” test bar, and 10µ rock. The rear housing ID was oversized and egged +68/+90µ (ISO is 0/+15µ). No other dimensional deviations were noted.
The following actions were performed on this Mori Seiki NVX 5100 spindle:
- Clean, inspect overall dimensions
- Grind, chrome plate, and finish grind the rear housing ID
- Kiss grind tooling taper
- Replace bearings, oil lines, ferrules, o-rings, and assembly screws
- Reuse Bellevilles, grippers, and encoder sensor
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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