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 MoreSKF 18SB1037 Spindle Repair
The SKF 18SB1037 spindle is grease lubricated, coupling driven, and capable of running up to 1,500 rpm.
CHALLENGE
This SKF 18SB1037 spindle suffered a catastrophic failure of the front roller bearing, likely due to friction from excessive lubrication. We found multiple types of grease throughout the spindle, and the grease was not contained to just the rolling elements. Our customer indicated that front roller preload must not allow more than .0002” axial movement @1000lbs vertical pressure. It was also noted that the front 90mm shaft pilot OD was undersized -12/-15µ with runout of 4/5µ, but the customer stated that this was not significant.
SOLUTION
The following actions were performed on this SKF 18SB1037 spindle:
- Clean, inspect overall dimensions
- Replace bearings, screws, drive coupling bushings, grease fittings, and dust covers
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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