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
Voumard VMX-90 Spindle Repair
The Voumard VMX-90 is an oil mist lubricated and stator driven spindle capable of running up to 90,000 rpm.
Northland Tool received this ID grinding spindle from a new customer because their spindles were failing prematurely in the machine. Their spindle rebuild costs had increased dramatically along with their machine downtime. When we disassembled the spindle we found out why. The coolant jacket was compromised and was leaking coolant into the interior of the spindle. The bearings were lubricated with grease even though it is an oil injected spindle. The bearings that were used had a top speed rating of 52,000 rpm with grease. Front and rear shaft journals were undersized, front is -4/-5, rear is -6/-7 (iso is +/-2.5). All these issues combined caused premature rear bearing failure.
The following actions were performed on this Voumard VMX-90 spindle:
- Grind, chrome plate, and finish grind (GPG) the shaft front and rear journals
- GPG the shaft pilot
- Replace bearings with ceramic
- Replace all orings and pressure check the coolant jacket to insure there is no leaking
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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In this helpful guide to spindle bearing preload, Northland Tool & Electronics will answer all the basic questions about your spindle bearing preload calculations.Read More