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 MoreDoosan Mynx 650 Spindle Repair
The Doosan Mynx 650 is from a line of CNC milling machines that are designed to handle steel and hardened metals. The spindle we repaired is oil lubricated and capable of running up to 12,000 RPM.
CHALLENGE
Our customer sent in this Doosan Mynx 650 spindle for evaluation. The spindle arrived disassembled so we went straight into the evaluation of the spindle. After a close inspection we noted that the drawbar rod itself was missing. We received the spacers, nut, and grippers but not the rod. There had been a catastrophic failure of the #2 bearing where the ball cage was destroyed and significant heat damage occurred. We then completed a full dimensional evaluation of the spindle and found that the ID taper showed signs of wear and failed our air gauging tests for angle. No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Doosan Mynx 650 spindle:
- Clean, inspect overall dimensions
- Replace bolts, bearings, o-rings, bellevilles, grippers, and drawbar
- Kiss grind the 40 ID taper
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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