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
Ingersoll T-1500 Spindle Repair
The customer reported that a cleaning rag became entangled in the upper drive spindle during operation.
Drive spindle was locked up and partially disassembled when received. Upon disassembly of the spindle, rag debris was found in the rear labyrinth. It appeared that increased pressure caused failure of the #3 bearing from excessive preload. When #3 bearing failed, the inner race was fused to the drive spindle shaft.
The main spindle tooling taper ID showed heavy wear with poor tool contact and measured with excessive runout of >20µ. The front bearing journal OD is undersized by -8/-9µ where #1 bearing locates (ISO is ±6µ). The graphite seal on the main spindle was broken during breakdown.
Gripper fingers (collet) & drive dogs (keys) were worn & damaged. Touch sensor ring is damaged.
The following actions were performed on this Ingersoll T-1500 spindle:
- Clean, inspect overall dimensions
- Grind, chrome plate, and finish-grind main spindle tooling taper ID and front bearing journal OD
- Manufacture new touch sensor ring
- Replace all bearings, Bellevilles, grippers, graphite seal, drive dogs, seals, o-rings & assembly screws
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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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