This Mori Seiki spindle was sent to us from a company in Italy to repair. Their sister plant here in the United States has been a customer of ours for spindle rebuild over 20 years.
The spindle was completely disassembled when we received it. At times this makes it difficult to determine the cause of failure but we are able to determine which parts will need to be reworked or replaced in our initial spindle evaluation. Our evaluation showed that the front spindle bearings failed first and were stressed to the point that the inner races split. The drawbar assembly gripper fingers and Belleville washers were worn beyond tolerance. The shaft drive dogs and front cover were damaged from impact. The rear housing was tapered and worn oversize by 25 microns.
We replaced the gripper fingers and Belleville washers to recondition the drawbar assembly. Our machining department repaired the damaged drive dogs. The rear housing and shaft taper where sent to our grinding department where they were green ground, chrome plated then finish ground on one of our Kellenburger ID/OD universal grinders.
Once the reconditioned parts passed our QC process the spindle was released to our clean room for assembly. The shaft was balanced on our schenk balancer and the bearings were installed. Then shaft was gently slid into the housing and the capture was set. After the rest of the spindle was assembled the spindle was placed on our custom test stand for break in and final trim balance. When this was completed the spindle repair was thoroughly tested by our QC personnel to insure micron tolerances are held and the vibration levels were within our standards.
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This customer was referred to us by another of our customers. This spindle had been repaired several years ago and during that repair the taper was kiss ground. Unfortunately that made the BIG PLUS ta [...]
Possible cause of failure: Shaft taper is worn, tooling rocks in the taper. Drawbar force is 1420lbs incoming (low for a Big Plus taper), likely from being taper ground. Taper coolant plungers [...]
Possible cause of failure: Nose of shaft is bent, excessive run out. Face has 40µ runout,taper has 40µ runout,front shoulder has 22µ run out. Front taper is 10µ egged,thrust bearing journal [...]
BIG PLUS Taper 12,000 rpm This spindle was crashed causing damage to the front bearings and the BIG PLUS taper. We needed to grind plate grind the taper to bring it back to manufacturers specificati [...]
The taper of this spindle had build up causing tool run out. The front bearings were contaminated and the front housing was over sized. All these factors contributed to bad part finish that eventu [...]
6,000 rpm Grease lubricated Magnetic Rotor This spindle was crashed causing bearing failure and alignment pin damage. What makes this repair unique is the magnetic rotor. Special care mus [...]
12,000 rpm We repair several spindles from our customers in Canada. This spindle came to us in very rough shape. The spindle had a damaged shaft taper, broken drive dogs, coolant plungers were [...]
3500 RPM The initial concern for this customer was the sound of the bearings during rotation. Upon further inspection the temperature of the spindle had elevated. This was caused by contaminati [...]
6,000 RPM This spindle came in with the coupling for the drive motor attached to the rear of the shaft. Our incoming evaluation found the mating surfaces of these two parts was fretted and out [...]
This Mori Seiki spindle was sent to us from a company in Italy to repair. Their sister plant here in the United States has been a customer of ours for spindle rebuild over 20 years. The spindle [...]
Mori Seiki has been a mainstay in the machine tool world since 1948. They are known for quality and reliability. Mori Seiki spindles share the same qualities as the Mori Seiki machine. Mori Seiki spin [...]
Mori Seiki SL-00 Spindle Rebuild Possible cause of failure: Spindle came in missing the front cover bolt’s. Rear roller failure from coolant contamination, rear housing cover is coated with coola [...]
This repair had been started by our customer but after they got into it they decided the best route would be to send it to Northland Tool for repair. We found the front bearings were worn and the [...]
Mori Seiki MV-65 Spindle Rebuild Coolant entered the interior of this spindle causing the grease to wash away from the front roller bearings. Much like running a car without oil once the bearing lubr [...]
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.
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.
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
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.
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!
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.
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.
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.
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.
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…