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 MoreHurco VM20 Spindle Repair
The Hurco VM20 is a mid sized CNC vertical machining center. It can come equipped with this grease lubricated and belt driven spindle capable of running up to 10,000 rpm.
CHALLENGE
This Hurco VM20 spindle had bearings that were noisy when rotated by hand in assembly incoming. After disassembling the spindle, we noted that there was virtually no contamination in the spindle but the front bearings felt worn when spun by hand. We then measured all critical dimensions and found a few unacceptable deviations. First, the gripper fingers (collet) had significant wear on critical tool retention surfaces. Lastly, the tooling taper ID had high runout >5µm in the small diameter measured on the bare shaft. No other significant dimensional deviations were noted (bearing journals/shoulders, housing bores).
SOLUTION
The following actions were performed on this Hurco VM20 spindle:
- Clean, inspect overall dimensions
- Kiss grind the tooling taper ID
- Replace all bearings, bellevilles, grippers, o-rings, and asssembly 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.
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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