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
Hardinge Bridgeport GX 300 Spindle Repair
The Hardinge Bridgeport GX 300 is a compact CNC vertical machining center. It comes fitted with a grease lubricated and belt driven spindle capable of running up to 7,080 rpm.
This Hardinge Bridgeport GX 300 spindle was received without drawbar. The rear nut was loose and pulley slid back towards rear. Assembled runout in the taper was bad at 8-10µ, with low dips in taper. There were 4 broken screws in the rear of the spindle shaft that will need to be removed. Fortunately, the grease in all the front bearings looked new and the bearings felt good. The rear roller however, had some internally formed particulate contamination and the grease was discolored. No other dimensional deviations were noted for this repair.
The following actions were performed on this Hardinge Bridgeport GX 300 spindle:
- Clean, inspect overall dimensions
- Replace bearings, o-rings, and assembly screws
- Remove broken bolts in rear of spindle shaft
- Kiss grind taper ID
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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