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 SH 8000 Spindle Repair
The Mori Seiki SH 8000 is a large CNC horizontal machining center with a pallet system built in. It can come equipped with this coupling driven and oil lubricated spindle capable of running up to 15,000 RPM.
CHALLENGE
Our customer sent in this Mori Seiki SH 8000 spindle stating that the spindle has been noisy since they bought it and lost pull force recently. When it arrived at Northland Tool we were only able to get 200 lbs of force when it should be over 3000 lbs. After a closer inspection we also noted that the gripper post was loose. We then performed a full breakdown of the spindle and found that there was a ball cage that was cracked in the bearings, which is likely the source of the noise.
The front bearings were also contaminated with a brown particulate. We then completed a dimensional evaluation and recorded that the ID tooling taper had 4μ of run out and uneven tool contact. Lastly, the gripper fingers were worn and needed to be replaced.
SOLUTION
The following actions were performed on this Mori Seiki SH 8000 spindle:
- Clean, inspect overall dimensions
- Replace bolts, bearings, and o-rings
- Replace grippers and coolant plunger assemblies
- Grind, plate, grind (GPG) the ID tooling Taper.
- Replace 5/8 amplifier balls
RESULT
After reassembly of all components and adjusting bearing preload, we put the spindle through a rigorous break-in and testing procedure to make sure it passes our final quality inspection.
This spindle passed our final quality inspection and was returned to our customer with a 1-year warranty.
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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.
Spindle contamination is a critical issue that can significantly impact the performance and longevity of your machinery.
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