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 MoreKiwa KMH-300 Spindle Repair
The Kiwa KMH-300 is a CNC horizontal machining center. It can come equipped with this grease lubricated and coupling driven spindle capable of running up to 20,000RPM.
CHALLENGE
Our customer sent in this Kiwa KMH-300 spindle for repair due to the spindle failing from 1.5 years of run time. Once the spindle arrived at Northland Tool we completed a full disassembly and evaluation.
This is what we found:
- Spindle rotated freely but the bearings felt worn when spun by hand
- Coolant contaminated the front and rear bearings and washed the grease out (PIC 1)
- #1 and #2 bearing failed due to overheating from lack of lubrication
- The gripper fingers were worn (PIC 2)
SOLUTION
The following actions were performed on this Kiwa KMH-300 spindle:
- Clean, inspect overall dimensions
- Replace bolts, o-rings, quad rings, bearings, bellevilles, and gripper fingers
RESULT
After reassembly of all components and adjusting bearing preload 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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