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 MoreVoumard VMX30 Spindle Repair
The Voumard VMX30 spindle is oil mist lubricated, stator driven, and capable of running up to 30,000 rpm.
CHALLENGE
Our customer indicated that their tech found two open legs on this Voumard VMX30 spindle. We could not confirm this, as the stator (field) passed all incoming electrical testing. The spindle bearings were noisy and felt rough when rotated by hand in assembly incoming. After disassembly and evaluation, we noted that we removed bearings with steel rolling elements which are barely rated for this spindles speed. The grease in the front bearing pair was contaminated and the bearings were approaching failure. Lastly, the front shaft nut was stuck on and had significant damage. No other dimensional deviations were noted (tooling pilot, bearing journals/shoulders, housing bores).
SOLUTION
The following actions were performed on this Voumard VMX30 spindle:
- Clean, inspect overall dimensions
- Manufacture and install a new front shaft nut
- Component balance the shaft on the Schenck balancing system
- Upgrade all bearings to speed-rated hybrid ceramics
- Replace o-rings and assembly 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.
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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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