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 MoreMilltronics BR5100 Spindle Repair
Our customer’s bridge mill spindle was not manufactured by the machine OEM, Milltronics USA Inc. The Cells D-series direct-drive spindle itself was manufactured in Taiwan by Cells Tec Co. Ltd. This is not particularly uncommon in the machine tool industry, where some OEM’s design and build their own spindles, while many others install the products manufactured by various spindle OEM’s.
This Cells D-series spindle is out of a Milltronics BR5100 CNC bridge mill. It is grease lubricated and capable of running up to 10,000 rpm.
CHALLENGE
The rebuild process itself was pretty straightforward, other than the corrosion & light damage to the tooling taper ID. The tool retention gripper fingers had been removed by the customer, who indicated that they were worn and in need of replacement. The spindle bearings were very noisy when rotated in assembly, and we did observe what seemed to be an excessive amount of bearing grease, which can lead to friction & heat buildup during operation. No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Milltronics BR5100 spindle:
- Clean all parts of the spindle
- Replace all bolts, o-rings, and bellevilles
- Replace gripper fingers and thermistor
- Replace bearings
- Kiss grind tooling taper ID
RESULT
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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Repair History - Here are examples of similar spindle repairs that may contain additional information that will help you. If you have additional questions, please contact us.
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