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 MoreFeeler VMP-1100 Spindle Repair
The Feeler VMP-1100 is a CNC vertical machining center. It can come fitted with this grease lubricated and gear driven spindle that is capable of running up to 10,000RPM.
CHALLENGE
Our customer sent in this Feeler VMP-1100 spindle stating that the spindle was seized. Once the spindle arrived at Northland Tool we completed a full disassembly (Pic 1) and evaluation.
This is what we found:
- The rear bearings were a tight fit on the shaft and the inner race rolled the rear shaft threads.
- Coolant contamination washed the grease out of the bearings
- Rear bearings catastrophically failed due to lack of grease (Pic 3&4)
- Front bearings were contaminated with particles from the rear bearings (Pic 2)
- Front ID taper had high run out and poor contact
- Grippers were worn from use
SOLUTION
The following actions were performed on this Feeler VMP-1100 spindle:
- Replace bolts, o-rings, bearings, bellevilles, and grippers
- Grind-Plate-Grind (GPG) ID 40 taper due to high run out and poor contact
- Chase damaged threads on the shaft
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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