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 MoreKitamura HX250G Spindle Repair
The Kitamura HX250G is a CNC horizontal machining center. It can come equipped with this oil lubricated and stator driven spindle capable of running up to 30,000RPM.
CHALLENGE
Our customer sent in this Kitamura HX250G spindle for evaluation. 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
- Customer sent a new encoder in with the spindle
- Actuator functioned properly
- Draw bar pulled slightly low force
- The field passed incoming motor testing
- Coolant pressure and flow test passed
- Front and rear bearings were contaminated with a thick brown sludge (Pic 1)
- HSK taper had high run out bare shaft
SOLUTION
The following actions were performed on this Kitamura HX250G spindle:
- Replace bolts, O-rings, Bearings, Seals, and Bellevilles
- Grind-Plate-Grind (GPG) HSK 40 taper due to high run out
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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