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 NV-5000 Spindle Repair
The Mori Seiki NV-5000 is a CNC vertical machining center. It can come equipped with an oil mist lubricated spindle that is capable of running up to 12,000 rpm.
CHALLENGE
The rotor of this Mori Seiki NV-5000 spindle had broken loose from the shaft causing end play or axial movement of the shaft. This damaged the #1 bearing oil injector causing an interruption in lubricant flow and ultimately bearing failure. Lastly, the taper had 3-4 microns of runout and there were high spots on the shaft from a spun spacer. No other imdensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Mori Seiki NV-5000 spindle:
- Clean, inspect overall dimensions
- Replace ceramic quad set of bearings and high speed tapered roller
- Replace rotor, jet, front cover, guard, and housing from other spindle
- Kiss shaft taper
- Kiss high spots on shaft
- Replace large and small ferrules, drive keys, and coolant plunger assembly
RESULT
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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