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 ACC28-60DX Spindle Repair
The Okamoto ACC28-60DX is a very common CNC surface grinder. It comes fitted with this grease lubricated and coupling driven spindle capable of running up to 1,500 RPM.
CHALLENGE
This Okamoto ACC28-60DX spindle rotated freely when it arrived at Northland Tool, but the bearings felt worn when spun by hand. We also noted that there was grease on the outside of the rear cover incoming
After completing a full breakdown and evaluation, we recorded that coolant had contaminated and washed the bearings out in both the front and rear. The OD taper had high run out incoming, but once apart it was only 2μ.
SOLUTION
The following actions were performed on this Okamoto ACC28-60DX spindle:
- Clean, inspect overall dimensions
- Replace bolts, bearings, o-rings, and front seal
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. See below for the passing test reports:
Front Bearings Vibration Analysis Spectrum: Rear Bearings Vibration Analysis Spectrum:
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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