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
Tsugami FMA3 Spindle Repair
The Tsugami FMA3 is a CNC horizontal machining center. It comes fitted with an oil injected and stator driven spindle capable of running up to 10,000 rpm.
This Tsugami FMA3 spindle arrived at Northland Tool and Electronics for a full breakdown and evaluation. Upon inspection, we noted that the #1 front bearing failed from coolant contamination and the #3 bearing ball cage was melted and broken, possibly from particulate contamination. We measured the critical dimensions and noted that the shaft taper was pock-marked, the shaft rear roller journal was undersized -5/-6µ (ISO is +2/+10µ), and the #1 and #3 oil injectors were damaged. We also noted that the rear mounting tabs were broken off.
The following actions were performed on this Tsugami FMA3 spindle:
- Clean, inspect overall dimensions
- Kiss grind shaft taper
- Grind, chrome plate, and finish grind the shaft rear roller journal
- Replace bearings, #1 and #3 oil injectors, o-rings & screws
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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