Catastrophic bearing failure was the main cause of this spindle malfunction Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication……Read More
Miyano BND-20S Spindle Repair
The Miyano BND-20S is a CNC turning center. It comes fitted with a grease lubricated and belt driven spindle that is capable of running up to 6,500 rpm.
This Miyano BND-20S spindle was received with the shaft seized. Upon inspection, we noted that the rear roller bearing had catastrophically failed. It suffered total cage destruction and the debris contaminated the entire spindle. The front bearing pair were also heavily contaminated, with no grease left in any of the bearings. Substantial fretting found on the front journal when the bearings were removed. The front journal measures undersized (-10) where the bearing was located which is out of ISO specification. Oil was found on all the bolts holding the front cover on the spindle. We measured good runout on shaft face and Pilot ID and there were no issues with either housing bores.
The following actions were performed on this Miyano BND-20S spindle:
- Clean, inspect overall dimensions
- Replace bearings, o-rings, and assembly bolts
- Grind, chrome plate, and finish grind the front journal
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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