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 MoreMori Seiki NHX4000 Spindle Repair
The Mori Seiki NHX4000 is a high production CNC vertical machining center. It can come fitted with this oil mist lubricated and stator driven spindle capable of running up to 12,000 RPM.
CHALLENGE
This Mori Seiki NHX4000 spindle was completely seized when it arrived at Northland Tool. After performing a full breakdown and evaluation, we recorded a couple of issues. The front bearing was heavily contaminated with a thick brown sludge and the front labyrinth spacers were seized together due to the extreme amount of contamination.
When the dimensional evaluation was completed we noted that the ID tooling taper had high runout bare shaft. (6μ) No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Mori Seiki NHX4000 spindle:
- Clean, inspect overall dimensions
- Replace bearings, bolts, and o-rings
- Grind, plate, grind (GPG) the 40 ID tooling taper
RESULT
After reassembly of all components and adjusting bearing preload, we put the spindle through a rigorous break-in and testing procedure to make sure it passes our final quality inspection. See below for the passing test reports:
Front Bearings Vibration Analysis Spectrum:
This spindle passed our final quality inspection and was 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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