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 MoreFortuna S13UX250 Spindle Repair
The Fortuna S13UX250 is a grinding spindle that is grease lubricated and belt driven capable of running up to 12,500RPM.
CHALLENGE
Our customer sent in this Fortuna S13UX250 spindle stating that the spindle was getting hot and noisey. Once the spindle arrived at Northland Tool we completed a full disassembly and evaluation.
This is what we found:
- Spindle rotated freely by hand incoming
- Coolant contaminated the front and rear bearings and washed the grease out (Pic 2)
- Rear bearing inner race fretted against the journal and caused severe damage (Pic 1)
- The spindle was built with an improper bearing arrangement
- Front ID taper runout is out of spec
SOLUTION
The following actions were performed on this Fortuna S13UX250 spindle:
- Replace bearings
- Rebuild with the correct bearing arrangement
- Kiss grind ID taper
- Grind-Plate-Grind (GPG) Rear 30mm bearing journal due to severe damage from the inner race
RESULT
After reassembly of all components and adjusting bearing preload 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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