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
Porta N-145 FMU Spindle Repair
The Porta N-145 FMU spindle is one of several installed on a transfer machine used in the manufacturing of driveline components. It is a grease lubricated and belt driven spindle capable of running up to 2,000 rpm.
The bearings in this spindle were very noisy when rotated in assembly incoming. Upon disassembly we observed that the entire spindle interior was heavily contaminated with a brown sludge consisting of part coolant and particulate. This contaminant had degraded the grease in the bearings and caused wear of the races and rotating elements. We also noted degradation of the ball screw unit which controls the Z axis motion. Finally, we decided to address the heavily damaged and stuck tool drive keys and the tooling taper ID which was extremely worn, with runout >46µm. The customer retained the drawbar assembly, reinstalling it in their spare spindle to keep production moving.
In preparation for the final assembly of the spindle, we sent the ball screw unit to a reliable vendor for a precision rebuild. We completed a grind, chrome plate, and finish grind of the tooling taper ID on our in-house Kellenberger grinding machines. We also machined out the old drive keys and fabricated a new set. After a thorough cleaning of all components, we rebuilt the spindle with all new bearings, drive belt, seals, o-rings, and assembly screws. We also installed the rebuilt ball screw unit and the newly-fabricated drive keys.
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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Porta N145 FMU Spindle Rebuild
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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