The Bridgeport Torq-Cut 22 is a smaller CNC vertical machining center. It comes fitted with a grease lubricated and belt driven spindle capable of running up to 7,500 rpm.
Read MoreHardinge Quest 6/42 Spindle Repair
The Hardinge Quest 6/42 is a CNC turning center made for high production lathe work. It comes equipped with a stator driven and grease lubricated spindle capable of running up to 5,000 rpm.
CHALLENGE
When this Hardinge Quest 6/42 spindle arrived at Northland Tool and Electronics, we performed a quick incoming test run to 3000 rpm. We noted from this that the bearings were noisy and the spindle had high balance. Upon disassembly, we found that the front bearing triset and rear pair were contaminated with coolant. The grease had been degraded throughout and were rough when spun by hand. We also noted that the inside of the front cover and other interior surfaces of the spindle had coolant residue and some corrosion. No dimensional deviations were found in the spindle.
SOLUTION
The following actions were performed on this Hardinge Quest 6/42 spindle:
- Clean, inspect overall dimensions.
- Drill and tap for an air purge fitting in front cover to help mitigate coolant contamination.
- Upgrade to sealed bearings,
- Replace front cover gasket, rear lip seal, and screws.
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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More Case Studies
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.
It’s a fact of machining — eventually, even top-of-the-line turning machines will experience a spindle failure. Spindles endure tension, torsion, heavy loads, and speeds up to and beyond 150,000 RPM, to name a few of the standard stressors.
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