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 Duravertical 5100 Spindle Repair
The Mori Seiki Duravertical 5100 is a large vertical machining center that comes equipped with a high-speed, high-precision spindle. This specific spindle is stator-driven up to 12,000 RPM and is oil mist lubricated.
CHALLENGE
Upon initial inspection, the spindle was noisy and bearings felt scratchy when spun by hand. The ID taper was scarred and damaged as well as the OD of the shaft nose was damaged by the front cover rubbing. After disassembly, it was determined that the front bearings failed due to contamination of brown particulate. The front bearing inner race and the inner race on the bearing spacer showed significant damage as well. All other critical surfaces (bearing journals, housing, and bearing shoulders) had no signs of damage and measured in ISO specifications.
SOLUTION
The following actions were performed on this Mori Seiki Duravertical 5100 spindle:
- Clean all parts of the spindle
- Replace all bolts, o-rings, bearings, and coolant plungers
- Grind-Plate-Grind (GPG) ID taper pilot
- Kiss grind OD shaft nose
- Repair damaged bearing spacer
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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