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 MoreMatsuura RA-IIIF Spindle Repair
The Matsuura RA-IIIF is a CNC vertical machining center. It comes equippped with an oil mist lubricated and direct driven spindle capable of running up to 15,000 rpm.
CHALLENGE
This Matsuura RA-IIIF spindle arrived at Northland Tool and Electronics in pretty rough shape. The rear housing cover was coated with coolant residue, perhaps from leaking rotary union. Upon disassembly, we noted that there was a catastrophic rear roller bearing failure from contamination. Because of the rear bearing failure the rear roller housing became fretted and the rear roller bearing race can be pushed into the housing by hand. The shaft taper had a few deep pock marks and runout around said marks measured 2-4µ. Lastly, the gripper fingers were very worn and the front housing cover and unclamp bar were not supplied with spindle.
SOLUTION
The following actions were performed on this Matsuura RA-IIIF spindle:
- Clean, inspect overall dimensions
- Grind, chrome plate & finish grind (GPG) the rear roller housing
- GPG the shaft taper
- Install air purge port in rear cover to reduce rear roller contamination
- Replace bearings, Bellevilles, o-rings, and grippers
- Customer to supply missing components for setting drawbar and test running spindle
- Customer should inspect rotary union for leakage
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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