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 MoreMori Seiki NZ2000 Spindle Repair
The Mori Seiki NZ2000 is perfect for high production turning with three turrets and two spindles. The spindle we repaired is grease lubricated and stator driven capable of running up to 4,000 rpm.
CHALLENGE
Our customer sent us this spindle because of vibration and poor part finish during operation. Upon disassembly we found that the front quad bearing set was lightly contaminated with cutting oil, and the grease was starting to discolor. The 110mm shaft rotor journal was fretted -20µ where the front of the rotor locates. Lastly, the front of the rotor ID was lightly fretted.
SOLUTION
The following actions were performed on this Mori Seiki NZ2000 spindle:
- Clean, inspect overall dimensions
- Grind, chrome plate, and finish grind 110mm shaft rotor journal
- 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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