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
Studer S-50-4 Spindle Repair
Our customer indicated that this OD grinding spindle had locked up during operation. Upon inspection, we found that a lump of grinding swarf had penetrated the spindle interior through an incoming oil port. This particulate became lodged in the area between the ID of the rear bronze bearing and the OD of the spindle shaft. The rotation of the shaft smeared the particulate onto the ID of the bronze bearing, scarring it while also causing the shaft to rub out on the front bronze bearing and the thrust bearing.
Because the radial bronze bearings in this spindle are designed as tapered lobes, we could not rework the bearings on one of our Kellenberger cylindrical grinders. Our course of action was to rescrape the three bearings by hand so that the spindle oil would create the proper hydrodynamic film. The tolerance for radial motion at the front & rear bronze bearings had to be between 4 and 6 microns, while the thrust bearing had to limit axial motion to less than 4 microns. Fortunately, the spindle shaft was not damaged and required no attention. Because we did not receive the entire wheelhead assembly, we could not test run the spindle.
This spindle passed our final quality inspection before being returned to our customer with a 1-year warranty. On follow up, our customer reported that the spindle was functioning better than when it was first installed.
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Studer S-20 Spindle Repair
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Studer S20 Workhead Spindle Repair
Our customer indicated that the hydrodynamic Studer S20 Workhead spindle had seized up during operation. Once it arrived at Northland Tool and Electronics, we noted… [...]
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Our customer was having difficulty holding tolerances on their Studer grinder. They were able to narrow down the issue to the spindle assembly but they… [...]
Kellenburger 1000U Workhead Spindle Repair
This spindle from a universal cylindrical grinder came to us as a complete workhead assembly. It has a bearing complement which includes two different bearing… [...]
Kellenburger Kel-vision URS125 Spindle Repair
This Kellenburger Kel-vision URS125 spindle was seized incoming. After disassembling and evaluating the spindle, we noted that the shaft bearing journals and bronze oil bearings… [...]
Downtime is inevitable for any machine, but knowing how to reduce downtime or minimize its likelihood is critical.Read More