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 MoreHeald Red Head 273A Spindle Repair
This Heald Red Head 273A grinding spindle comes grease lubricated and belt driven. These give it the capability to run up to 8,200 rpm.
CHALLENGE
When this Heald Red Head 273A spindle arrived at our facility the first thing we noted was that the spindle was noisy when spun by hand. After disassembly, we found that there was light contamination throughout all of the bearings. We measure the critical dimensions (bearing journals, housing, taper, etc.) and found a couple issues. The pilot and face both had high runout and the pilot was oversized well out of heald specifications. (spec is 1.3746/1.3748″ Pilot measures 1.3767″) No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Heald Red Head 273A spindle:
- Clean, inspect overall dimensions
- Replace bearings, o-rings, and assembly screws
- Grind, chrome plate, and finish grind the 1.375″ ID pilot
- Kiss grind the pilot face
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.
DETAILED CAUSE OF FAILURE
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