Kellenberger Kel-Vision URS 125 Spindle Failure


Our customer indicated that this OD grinding spindle would load up in operation and eventually lock up. When we disassembled and evaluated the spindle and the other components on the wheelhead, we saw that the spindle shaft had rubbed out on the bronze oil bearings. It was apparent that a number of factors contributed to the failure of the hydrodynamic film between these components. The oil pump was partially seized, some oil supply fittings & fixtures were compromised and the oil bearing main housing was missing the o-rings. Additionally, the coolant passages for the OD spindle, drive motor & casting were plugged with grinding swarf. The OD drive motor bearings were also worn and the motor shaft shoulders had excessive runout. The ID grinding spindle was not supplied with the wheelhead, so we did not address the ID drive motor and belt tension pulley which were also seized.


Our rebuild started with a grind, chrome plate & finish grind of the OD spindle shaft journals and a kiss grind of the bronze bearings to remove the rubout damage. We also kiss ground the wheel hub taper to clean it up while the spindle shaft was up on the grinder. The shoulders of the OD motor shaft were also kissed to improve the runout, and we repaired the oil pump. After a thorough cleaning of all components, we reassembled the OD spindle & motor using new radial bearings (for the motor), drive belts, seals, o-rings, and various oil supply, vent & assembly components. We pressure tested the front & rear housings, filled the reassembled spindle with fresh oil and test ran the spindle for several hours while performing additional pressure testing. When were satisfied that the spindle was functioning properly, we drained the spindle oil for shipping, crated it and now it is back in the machine, making money for our customer.


  • Axial bearing damage

  • Damage to the radial bearing

  • Disassembly of the drive motor

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I really didn’t expect this; You guys really pulled it off! My many thanks to Sandy, Louis and your outstanding crew for helping us get back into production.

Dan Eaton, Taylor Metalworks

Lou all in all everything is running good. Just had a call from Sandy just the other day, its funny great minds think alike. Its great not to be sending spindles out on a regular basis since you addressed my problems, but I know they will still be coming sooner or later. Never a problem when we get them back , run better than new. Hope everything is ok there. Please tell everyone there that we here appreciate everything that you do to keep us up and running and the quick turnarounds. Have delt with the rest now deal with the best. Have a great week end and up and coming holiday.

Northland Customer

Thank you Debbie just received spindle today and WOW ! what a nice job. Can’t wait to use it. Thank the Northland team for us for a job well done 

Northland Customer

Both of the spindles that you repaired are on the machines and running great. We don’t have any spares for those grinders. We probably will not be purchasing a spare, as you have been able to turn around the repairs quickly and the price of a spare is cost prohibitive.

Northland Customer

I am writing to thank Northland Tool for going the extra mile and saving my company from expensive machine downtime and expensive repairs. We have always sent our Chiron spindles for repair as a shaft with bearings. None of our previous rebuilders pointed out the bearing fretting or the fact that the housing in the machine was out of tolerance and causing premature failure to the spindles. After Northland fixed the housings the spindles have never sounded as good or run as well! Great job guys!

Northland Customer

The detailed cause of failure reports and the expert technical advice that Northland Tool provides is bar none the best I have ever seen. We struggled to keep two of our large our milling spindles running for longer than 6 to 12 months. Northland Tools evaluation showed that the hydraulic nuts were not holding the assembly together causing premature spindle failure. We discussed this in detail and mutually decided to modify the spindle shaft to prevent this from occurring again. The first spindle we performed this on is still in the machine running like new after 3 years. That’s over three times the life of previous repairs and it’s still going strong. Easily over $40,000.00 of savings so far on that one machine and counting.

Northland Customer

Your people go above and beyond the call of duty when it comes to spindle repair. When we had difficulty with the spindle installation and we were able to talk directly to a spindle technician that helped us troubleshoot the issue it helped us out of a bind. We have sent several spindles to you and have nothing but great things to say.

Northland Customer

Thank you for your attention with my quick turn spindle repair. Your status updates allowed me to plan around machine downtime and I now know that you deliver on your promises. In the past other spindle repair vendors talked a big game and consistently failed to deliver. You not only delivered my spindle before the due date but you kept me informed throughout the entire repair process.

Northland Customer

You performed a miracle with my BIG PLUS spindle. After crashing the spindle severely damaging the taper we found that a replacement spindle was not only cost prohibitive but had a long delivery. Your repair was a fraction of the cost of new and you never would know that the spindle was damaged to the extent it was.

Northland Customer