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
Okuma MX50HB Spindle Repair
The Okuma MX50HB is a CNC horizontal machining center with a built in dual pallet changer. It can come fitted with a grease lubricated spindle that is capable of running up to 5,000 rpm.
This Okuma MX50HB spindle was seized incoming. Upon full breaking down and evaluating the spindle, we noted that all the grease was washed out of the bearings and they were locked up tight. Both roller bearings were contaminated and worn. We then measured the critical dimensions (bearing journals, housing, taper, etc.) and found a couple of issues. First, both the middle roller taper and rotor taper had 7 microns of runout. Lastly, the ID of the 50 taper had 20+ microns of runout. No other dimensional deviations were noted for this repair.
The following actions were performed on this Okuma MX50HB spindle:
- Clean, inspect overall dimensions
- Replace all bearings, bolts, and O-rings
- Kiss grind roller taper
- Kiss grind rotor taper
- Kiss grind the ID of the 50 taper
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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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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