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 MoreHowa MSN-500H-VC Spindle Repair
The Howa MSN-500H-VC is a CNC vertical machining center. It can come equipped with this grease lubricated and coupling driven spindle capable of running up to 12,000RPM.
CHALLENGE
Our customer sent in this Howa MSN-500H-VC spindle for taper repair and the drawbar stopped working. 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
- Draw bar pulled low force at 300lbs
- Bearings were contaminated with coolant and the grease was aged and deteriorated
- ID 30 taper had high run out and bell mouth contact
- Front shoulder had high run out
SOLUTION
The following actions were performed on this Howa MSN-500H-VC spindle:
- Clean, inspect overall dimensions
- Replace bolts, o-rings, bearings, bellevilles, and gripper balls
- Grind-Plate-Grind ID 30 taper due to high run out and bell mouth contact
- Kiss Grind front bearing shoulder 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.
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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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