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 MoreLOH LZ-25 Spindle Repair
The LOH LZ-25 is a very low speed grinding spindle. It is grease lubricated, belt driven, and capable of running up to a whopping 50 rpm.
CHALLENGE
This LOH LZ-25 spindle was hard to turn incoming at our facility. Upon disassembly and inspection, we noted that the interior of the spindle was contaminated. We were surprised to find that the bearing complement does not include angular contact bearings, only thrust bearings and a linear ballcage. The ballcage rides smoothly on the shaft after a good cleaning and lubrication. The shaft was slighty worn but is fully functional. The front housing ID had two deep wear grooves from a seal spinning. Lastly, the front ID pilot was pitted and the shaft face had excessive runout. No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this LOH LZ-25 spindle:
- Clean, inspect overall dimensions
- Grind, chrome plate, and finish grind the front housing ID seal surface
- Replace thrust bearing balls and o-rings
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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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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