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 ACC-820DX Spindle Repair
The Okamoto ACC-820DX is an automatic surface grinder. It comes fitted with a grease lubricated spindle that is capable of running up to 3,600 rpm.
CHALLENGE
This Okamoto ACC-820DX spindle was noisy when spun by hand incoming and had an extreme amount of rust and corrosion present on the nose of the spindle. The front OD Taper threads had corroded away and were extremely loose with the provided nut. The last note we took before breaking down the spindle was that the customer supplied tool had a crack through the threads that lock the wheel in place. After disassembly, we noted that the front bearings were heavily contaminated with a thick particulate. The rear bearings were contaminated as well but not as heavily as the front. The critical dimensions (bearing journals, housing, taper, etc.) were then measured. First, the front OD taper had high runout bare shaft (8µ). Lastly, the front housing showed signs of fretting and was out of ISO. (ISO is ±7.5µ, housing was +18/+20µ). There were no other dimensional deviations noted for this repair.
SOLUTION
The following actions were performed on this Okamoto ACC-820DX spindle:
- Clean, inspect overall dimensions
- Replace bearings, bolts, and o-rings
- Weld and repair damaged threads on front OD Taper
- Grind, chrome plate, and finish grind the front housing
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.
DETAILED CAUSE OF FAILURE
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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.
Spindle contamination is a critical issue that can significantly impact the performance and longevity of your machinery.
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