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
Kitamura Mycenter 4XD Spindle Repair
The Kitamura Mycenter 4XD vertical machining center is equipped with a high-power (35-HP) spindle capable of running up to 12,000 rpm.
Our customer experienced a machine crash that caused severe damage to the spindle. They sent a second, identical spindle in case we could reuse parts to expedite the rebuild. Upon initial inspection, our technician noted that the tooling taper ID had significant surface damage. The ceramic bearings sounded fine when rotated by hand, but some coolant contamination was found and it was recommended that these should be replaced. The drawbar assembly and grippers were in good condition, and tool retention force was adequate. All critical dimensions were found to be within tolerance of specifications (bearing journals/shoulders, housing bores).
After our assessment and customer approval to proceed with the rebuild, all parts to be reused were thoroughly cleaned.
We performed a kiss grind to the tooling taper ID to smooth the surface damage. We replaced NSK ceramic bearings, o-rings, and assembly 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.
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