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
Milltronics VM25 Spindle Repair
The Milltronics VM25 is a CNC vertical machining center that comes fitted with linear ways. The spindle we repaired is grease lubricated, pulley driven, and capable of running up to 15,000 rpm.
This Milltronics VM25 spindle felt rough when spun by hand and the bearings were scratchy incoming. There were no drive dogs attached to the spindle but there was one floating around in the box. That drive dog is
damaged and needs to be remade as well as make the missing one. After a complete breakdown and evaluation, we noted that the front and rear bearings were contaminated with a brown particulate. The actuator did not function properly incoming and hydrualic fluid leaked around the seals. It was also noted that the ID taper had high run out (4) and chrome was flaking off of the taper. Lastly, the grippers were worn and will need to be replaced. No other dimensional deviations were noted for this repair.
The following actions were performed on this Milltronics VM25 spindle:
- Clean, inspect overall dimensions
- Replace bolts, bearings, o-rings, bellevilles, and grippers
- Grind, chrome plate, and finish grind the 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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