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 MoreHardinge TT-65 Spindle Repair
The Hardinge TT-65 is a twin spindle/twin turret CNC turning center made for high production and high precision lathe work. It comes equipped with a grease lubricated and pulley driven main spindle capable of running up to 4,400 rpm.
CHALLENGE
When this Hardinge TT-65 spindle arrived at Northland Tool and Electronics we performed a full breakdown and evaluation of the spindle. Upon inspection, we found that the front and rear bearings failed from contamination. The contamination in turn caused the cages in the bearings to catastrophically fail and melt!!! We also noted that the front cover gasket was worn. The critical dimensions (bearing journals, housing, taper, etc.) were measured. We found that the drive pulley ID was scored and egged out of ISO. No other critical dimensional deviations were noted.
SOLUTION
The following actions were performed on this Hardinge TT-65 spindle:
- Clean, inspect overall dimensions
- Replace bearings, bolts, and o-rings
- Replace front cover gasket
- Grind, chrome plate and finish grind the pulley ID
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.
DETAILED CAUSE OF FAILURE
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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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