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
Cincinnati Milacron 10HC 2500 Spindle Repair
The Cincinnati Milacron 10HC 2500 is a very large CNC horizontal machining center. It comes fitted with an oil mist lubricated and gear driven spindle capable of running up to 4,000 rpm.
A customer sent us their Cincinnati Milacron 10HC 2500 spindle and reported noise at the low end of operating speed. Upon our initial inspection, the spindle was noisy and bearings felt rough when spun by hand. There were no signs of contamination upon disassembling the spindle. The taper appeared to be in poor condition and had poor tool contact. The main bearing housing has been previously re-worked and the housing was egged and out of ISO. Lastly, the drive dogs and gripper fingers were worn were worn and need to be replaced.
Precision grinding work was required to bring spindle parts back to spec. We performed a grind, chrome-plate, and finish grind to the 125mm bearing housing to address egged diameter. A kiss grind was applied to the 45 ID taper to improve surface contact.
This repair required full replacement of the following parts:
- Drive dogs
- Belleville washers
- Gasket and Seals
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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In this helpful guide to spindle bearing preload, Northland Tool & Electronics will answer all the basic questions about your spindle bearing preload calculations.Read More