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 SL-0H Spindle Repair
The Mori Seiki SL-0H is a 1980’s era CNC turning center. It comes equipped with a grease lubricated and belt driven spindle capable of running up to 6,000 rpm.
CHALLENGE
Prior to the arrival of this Mori Seiki SL-0H spindle, our customer indicated to us that the spindle had been crashed recently, resulting in repeatable axial endplay. We were able to confirm that the bearings had lost preload which allowed the excessive axial motion of the shaft. What our customer did not realize was that over time, ingress of coolant had severely degraded the grease in all of the bearings. In fact, the rear roller bearing had completely failed and the rolling elements were corroded. Despite the condition of the bearings and the crash of the spindle, our full dimensional evaluation did not uncover any significant deviations of the bearing journals, shoulders, housing bores, or lathe taper.
SOLUTION
The following actions were performed on this Mori Seiki SL-0H 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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