Weiss 176191-476 Spindle Repair


Our customer had a Weiss 176191 spindle failure in a Bridgeport XR1000 VMC. Upon initial inspection, we found that the tooling taper ID had visible damage, with severe bell-mouthing as well as surface damage further up the taper. Disassembly of the spindle revealed that the #1 front bearing had suffered catastrophic failure with a disintegrated cage, which resulted in contamination of the rest of the quad set. Grease in all bearings was completely washed out, and there was evidence that the rear roller bearing had been flooded with coolant. The 70mm front journal on the shaft measured with 6µm runout where the #1 bearing was positioned. Gripper fingers (collet) showed significant wear on critical tool retention surfaces.



Weiss manufactures this particular spindle with a grease injection system, which requires periodic maintenance and significantly increases the cost of ownership over time. This type of grease injection system requires that operators maintain two expensive grease cartridges. We have developed a reliable method to plug the injection ports and convert Weiss spindles to use permanent grease, which saves time and money for our customers.

Every incoming spindle to Northland Tool is inspected to measure all critical dimensions, then thoroughly cleaned. This repair required a grind, chrome-plate, finish grind to the tooling taper ID and the 70mm front journal. We replaced all bearings, Bellevilles, grippers, seals, o-rings and assembly screws. The spindle entered the final phase of the repair process when we adjusted preload, assembled, balanced, and break-in before testing and final quality control inspection.



Every Northland Tool repair is covered by a comprehensive 1-year warranty.



  • Incoming spindle condition before inspection

  • Breakdown and inspection of all spindle components.

  • Bearings show grease contaminated with coolant

  • Before: Tooling taper ID damage

  • Tooling taper ID after Grind, Chrome-Plate, Finish Grind process.

  • Shaft being ground on a Kellenberger 1000U

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More Case Studies

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.

I really didn’t expect this; You guys really pulled it off! My many thanks to your outstanding crew for helping us get back into production.
— Dan Eaton, Taylor Metalworks
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 NTE 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
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