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 MoreOKK HM80 Spindle Repair
The OKK HM80 is a CNC horizontal machining center. It comes equipped with a grease lubricated and stator driven spindle capable of running up to 12,000 rpm.
CHALLENGE
Our customer indicated the spindle had excessive run out in the machine. After our breakdown and evaluation we found that the bearings had failed from coolant contamination (full of dried coolant residue.) We also noted that the shaft taper had 6-8µ run out. The front and rear shaft journals had scoring and 2-4µ runout. Lastly, the front shaft nut spanner holes and rear balance ring pin holes were damaged.
SOLUTION
The following actions were performed on this OKK HM80 spindle:
- Clean, inspect overall dimensions
- Kiss grind shaft taper
- Grind, chrome plate, and finish grind the front and rear journals
- Rework front shaft nut and rear balance ring
- Replace coolant plungers
- Replace bearings, 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.
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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