Hardinge Spindle Rebuild

Hardinge Spindle Repair

Hardinge 10,000 rpm spindle

A returning customer called us about a spindle. After two years of running the spindle started to make a high pitched noise. The customers machine tool repairman went in and told them it was belt noise. The customer adjusted belts and the spindle was quiet again. They called in a month later and the spindle was no longer running. The customer sent the spindle in for evaluation.



CHALLENGE

Hardinge 10,000 rpm spindle

A returning customer called us about a spindle. After two years of running the spindle started to make a high pitched noise. The customers machine tool repairman went in and told them it was belt noise. The customer adjusted belts and the spindle was quiet again. They called in a month later and the spindle was no longer running. The customer sent the spindle in for evaluation.

SOLUTION

We received the spindle and found that the spindle was seized. (When we receive spindles in that do spin we will test run it for an extensive evaluation.) The customer was made aware that the spindle was seized and that we needed to break it down. The breakdown evaluation showed that the spindle had catastrophic rear roller failure. The rear of the spindle was coated with a sticky coolant residue and the rear bearing had failed from the contamination. A detailed report was sent to the customer and it indicated that the customer should check their rotary union.

The spindle was quoted and approved for rebuild. The bearings, bellevilles and orings were all replaced. A kiss grind to the taper was necessary.

RESULT

The customer required a Machine Tool Repair person to install the spindle. The MTR stated he had never seen a more comprehensive rebuild.

DETAILED CAUSE OF FAILURE

  • Rear bearing assembly that was contaminated by coolant. The bottom right of the picture shows the inner raceway of the rear roller bearing. This should have a smooth surface but as you can see it is rough and pitted.

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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 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