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
Renaud 175-060196 Spindle Repair
The Renaud 175-060196 is a grease lubricated and belt driven spindle capable of running up to 8,000 rpm.
The bearings in this tool grinding spindle felt very rough when rotated by hand in assembly incoming. Coolant contamination was found throughout the spindle interior, which caused failure of both the front and rear bearing pairs. An additional factor was that the spring pack was covered with sticky coolant residue which prevented it from providing the proper bearing preload. The drive pulley was found to be very loose on the rear pulley journal of the shaft. Operation of the spindle with the loose fit had resulted in fretting and corrosion of the pulley journal OD. We observed no other significant dimensional deviations in the tooling pilot, on the bearing journals/ shoulders, or in the housing bores.
We performed a grind, chrome plate, and finish grind of the OD pulley journal. When all components had been thoroughly cleaned, we reassembled the spindle with new bearings, setting the proper preload, and replaced the 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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Downtime is inevitable for any machine, but knowing how to reduce downtime or minimize its likelihood is critical.Read More