Mori Seiki Dura Turn Spindle Coolant Contamination


Mori Seiki Dura Turn

This spindles shaft was rough to turn when it arrived at Northland Tool. It was also generating heat in the machine.  Eventually the part quality deteriorated to the point our customer sent it in for repair. Our evaluation showed that over time coolant had found its way to the front bearings and washed the grease out of them. This removes the lubrication from the bearings causing rolling element to bearing raceway contact and eventually bearing failure.


We inspected the labyrinth for damage or wear. Inspected the shaft and housings for size and deviation. We replaced the bearings and reassembled the spindle. Our test run and final QC showed the spindle exceeded our outgoing criteria.


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