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 NH4000 Spindle Repair
CHALLENGE
This Mori Seiki NH4000 spindle arrive with the shaft taper being worn, the tooling rocks in the taper. The drawbar force was 1,420 lbs incoming (low for a Big Plus taper), likely from being taper ground. After disassembling the spindle, we noted that the taper coolant plungers and gripper fingers were worn out. The #1 front bearing was bad, probably from a crash.
Customer supplied a standard tool, but shaft is set as BIG PLUS. Lastly, the front cover had a couple of cosmetic marks on the face. No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Mori Seiki NH4000 spindle:
- Clean, inspect overall dimensions
- Grind, chrome plate, and finish grind the taper to BIG PLUS spec
- Replace bearings, o-rings, bellevilles, taper coolant plunger assemblies, and gripper fingers
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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