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 MoreOkamoto OGM 820UD Spindle Repair
The Okamoto OGM 820UD is a high performance CNC surface grinder. It comes fitted with this grease lubricated and belt driven spindle.
CHALLENGE
This Okamoto OGM 820UD spindle rotated freely when it arrived at Northland Tool, but the bearings felt worn when spun by hand. After performing a full disassembly, we recorded that the grease in the bearings was contaminated with coolant and one of the threaded holes in the rear housing has been cross threaded.
A dimensional evaluation was then completed and we found two unacceptable deviations. FIrst, the front ID tooling taper had 4μ of run out and second, the front shoulder had high run out as well. No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Okamoto OGM 820UD spindle:
- Clean, inspect overall dimensions
- Replace bearings, bolts, o-rings, and seal
- Kiss grind the ID taper and front bearing shoulder
- Repair damaged threads in rear housing
RESULT
After reassembly of all components and adjusting bearing preload, we put the spindle through a rigorous break-in and testing procedure to make sure it passes our final quality inspection.
This spindle passed our final quality inspection and was 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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