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
Makino FNC80 Spindle Repair
This spindle had a damaged taper that was causing run out in the tool. As you can see in the pictures below the taper was worn on the outer edge. This can be caused by low drawbar pull force, allowing the tool to lose full contact with the taper and only contact the leading edge. This causes premature wear to the taper. It also causes tooling wear so please check your tools for wear before using the newly repaired spindle with worn tooling.
Our customer sent this Makino FNC80 and indicated that this spindle had high runout, tool rock, and poor part finish. Upon inspection of the spindle we found that coolant had completely washed out the grease of the front bearing quad set. We also noted that the shaft taper run out was 6-8µ and the taper was bell mouthed. Customer did not supply drawbar assembly, drive dogs, drive pulley, pulley keys, or pulley nut.
The following actions were performed on this Makino FNC80 spindle:
- Clean, inspect overall dimensions
- Replace all bolts and o-rings
- Replace bearings
- Kiss grind CT 40 shaft 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.
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Running this spindle too long caused deformed ball bearings and damage to the outer race Damage to the outer race is consistent with prolonged operation after spindle exhibited initial signs of needing to be rebuilt Every spindle rebuilt by North…Read More