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……
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Walter DB112005 Spindle Repair
The Walter DB112005 is a dual OD taper grinding spindle. It comes equipped with a grease lubricated and belt driven spindle capable of running up to 10,000 rpm.
CHALLENGE
Our customer, a large tooling manufacturer, was experiencing a loud, roaring noise and poor part finish with this double-ended grinding spindle. Our evaluation of the spindle showed that one of the two pairs of ceramic bearings had failed due to contamination with grinding swarf. The grease in those bearings was degraded to a dry powder, providing little or no lubrication. We also determined that the wheel hub tapers on both sides had excessive runout.
SOLUTION
We replaced both sets of ceramic bearings and improved the runout of both tapers with a kiss grind on one of our own Kellenberger cylindrical grinders, which can hold micron tolerances. Once rebuilt the tapers had less than a micron of run out.
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.


In machining, runout refers to inaccuracies in a tool or piece of equipment that cause it to spin off its ideal axis.
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