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
Hardinge Bridgeport VMC1000 P3 poorly rebuilt by another spindle repair company
Our customer sent us this Hardinge Bridgeport VMC1000 P3 spindle without the drawbar assembly and some of the rear rotating components. They did this because this is their spare spindle for a population of three of these machines. They indicated that the spindle became very tight and hard to turn after being rebuilt elsewhere and then ran for about eight months. They also stated that they believed coolant contamination of the bearings is to blame for the consistently short lifespan of the spindles on these machines.
When we evaluated the spindle, we noted that the front-most #1 bearing of the quad set had suffered a catastrophic failure. We partially confirmed the customer’s suspicion as the grease in the #2 & #3 bearings was contaminated with coolant. However, we also noted an excessive amount of lightly-discolored grease which had extruded from the between the races of the rear-most #4 bearing. The previous rebuilder may well have over-lubricated the quad set, which will lead to friction as the bearings try to plow through the excessive amount of grease. The heat from this friction will eventually cause bearing failure.
The following actions were performed on this Hardinge Bridgeport VMC1000 P3 spindle:
- Clean all parts of the spindle
- Replace all bolts and o-rings
- Replace bearings
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.
DETAILED CAUSE OF FAILURE
The excessive grease that migrated out of the rear of the quad set.
Notice the discoloration of the grease. Kluber NBU-15 is pure white when it is first applied to the bearings. Any discoloration shows the grease starting to deteriorate.
Notice the grease on the spacer that fits between the front bearing set.
Some more grease pictures.
Looks like they were trying to ice a birthday cake.
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Downtime is inevitable for any machine, but knowing how to reduce downtime or minimize its likelihood is critical.Read More