The Bridgeport Torq-Cut 22 is a smaller CNC vertical machining center. It comes fitted with a grease lubricated and belt driven spindle capable of running up to 7,500 rpm.
Read MoreGrosite 4S9-06N-8C01 Spindle Repair
The Grosite 4S9-06N-8C01 spindle is grease lubricated, belt driven, and capable of running up to 3,600 rpm.
CHALLENGE
This Grosite 4S9-06N-8C01 spindle arrived at Northland Tool and Electronics we noted that the spindle spun free, but had a deep growl to it when spun by hand. The spindle did pass an electrical test, but there was a mixture of an oily black particulate throughout the spindle. The grease in all the bearings was completely washed out by this contaminant and felt rough and scratchy. We found a broken o-ring under the front cover that could have let to the contamination. We then measured and inspected all the critical surfaces (bearing journals, housing, taper, etc.). There was slightly high runout on the OD taper and the taper had rubout damage with very poor tool contact. No other dimensional deviations were noted for the repair.
SOLUTION
The following actions were performed on this Grosite 4S9-06N-8C01 spindle:
- Clean, inspect overall dimensions
- Replace bearings, o-rings, and assembly screws
- Grind, chrome plate, and finish grind the OD taper
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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