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 FNC60 Spindle Repair
The Makino FNC60 is an 80’s style CNC vertical machining center which is actually marked as a Leblond-Makino. It can come equipped with this grease lubricated and belt driven spindle capable of running up to 10,000 rpm.
Our customer sent us this Makino FNC60 spindle stating it was noisy. We noticed right away that there was a low growl when spun by hand incoming. After completing the breakdown and evaluation of the spindle, we noted that there was heavy coolant contamination in the #1 and #2 bearings. The rear roller bearing showed signs of coolant conatamination as well. There were no dimensional deviations to note for this repair. The customer requested that we set the tool gap on this spindle to be the same as his other two machines for tool changes. This required a grind, chrome plate, and finish grind (GPG) to allow the taper to be brought forward.
The following actions were performed on this Makino FNC60 spindle:
- Clean, inspect overall dimensions
- Replace bearings, bolts, bellevilles, and gripper balls
- Grind, chrome plate, and finish grind the 40 ID 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