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 MoreOkuma MX50HB Spindle Repair
The Okuma MX50HB is a CNC horizontal machining center with a built in dual pallet changer. It can come fitted with a grease lubricated spindle that is capable of running up to 5,000 rpm.
CHALLENGE
This Okuma MX50HB spindle was seized incoming. Upon full breaking down and evaluating the spindle, we noted that all the grease was washed out of the bearings and they were locked up tight. Both roller bearings were contaminated and worn. We then measured the critical dimensions (bearing journals, housing, taper, etc.) and found a couple of issues. First, both the middle roller taper and rotor taper had 7 microns of runout. Lastly, the ID of the 50 taper had 20+ microns of runout. No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Okuma MX50HB spindle:
- Clean, inspect overall dimensions
- Replace all bearings, bolts, and O-rings
- Kiss grind roller taper
- Kiss grind rotor taper
- Kiss grind the ID of the 50 taper
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.
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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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