Hardinge Quest 8/51, 6000 RPM, grease bearing lubrication, belt drive
This lathe spindle was covered in sticky coolant residue mixed with turnings. Coolant & swarf had completely degraded the grease in the front tri-set of angular contact bearings and the rear roller bearing. At some point the rear bearing failed completely as evidenced by the broken cage. Our inspection turned up damage to the vibration damping mounts, front slinger cover and pulley retention nut. In addition, the pulley was fused to the shaft, but we were able to save the pulley by heating it while chilling the shaft to separate the two components without doing further damage. While we found excessive wear to both the ID & OD tapers, our comprehensive dimensional evaluation revealed no significant deviations on the shaft journals or in the housing bores.
We first performed a kiss grind on the shaft ID & OD tapers and face to alleviate the excess runout, and also repaired the damage to the front slinger cover and pulley retention nut. We replaced the front & rear bearings, front cover gasket, vibration damping mounts and assembly hardware. According to our standard break-in procedure, we ran in this spindle at progressively increasing speeds for a total of eight hours while checking the vibration signature & thermal signature and shipped it to our customer within three business days as an expedited repair.
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Hardinge Conquest SG-2, grease lubrication, belt driven, 6,000 rpm A long time MTR (machine tool rebuilder) had his own spindle in need of rebuild. He… [...]
Possible cause of failure: #1 front bearing failure from contamination. Front cover was slightly damaged when front bearing failed. ID taper has 8 microns runout. Front OD lathe taper has slight [...]
Over time coolant found its way through the front of the spindle and contaminated the bearings. Eventually this breaks down the bearing grease and causes bearing failure. Possible cause of failure: [...]
Possible cause of failure: Shaft nose has heavy rub out damage from being crashed. Id shaft collet taper has 10-12 microns runout. Od is very rough Timing pulley teeth are very worn. Front cover [...]
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…