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 NL2000SY Sub Spindle Repair
The Mori Seiki NL2000SY is a twin spindle CNC turning center. We repaired the sub spindle, which is grease lubricated and stator driven making it capable of running up to 6,000 rpm.
CHALLENGE
Our customer indicated that this Mori Seiki NL2000SY sub spindle was noisy during operation. We did not find excessive coolant contamination of any spindle components, only some light corrosion in the front labyrinth. Even the bearing grease was intact, with only the slightest discoloring. While there was no damage evident on the nose of the spindle, we could only conclude that some kind of undesirable contact occurred between the main spindle or turret and this sub spindle, causing the bearings to malfunction. In fact, we could find no significant dimensional deviations anywhere on the shaft taper, bearing journals and shoulders or in the front and rear bearing housing bores.
SOLUTION
The following actions were performed on this Mori Seiki NL2000SY sub spindle:
- Clean all parts of the spindle
- Replace all bolts and o-rings
- Replace bearings
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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