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
Mazak MTV-655 Spindle Repair
We received a call from a Machine Tool Repair company in Canada whom we have worked with on several occasions. His customer had a Mazak MTV-655 spindle where the oil system became contaminated. We asked the MTR to make sure that he sent with the spindle with the following items: tool holder, retention knob, assembly drawing, and parts list.
When this Mazak MTV-655 spindle arrived at Northland Tool and Electronics we completed a full breakdown and evaluation. Upon inspection, we found that the bearings were contaminated. The “TSC” gripper plunger was not functioning properly and appeared to be bent. Lastly, the shaft taper had 8µ of run out and the drive dogs (keys) were worn. No other dimensional deviations were noted on this spindle.
The following actions were performed on this Mazak MTV-655 spindle:
- Clean all parts of the spindle
- Replace all bolts, o-rings, and bellevilles
- Replace ferrules and oil lines
- Replace bearings
- Machine the drive dog damage
- Kiss grind ID tooling 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. This spindle was an expedited repair and shipped within 3 days of the approval.
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