Papas Fuma Spindle Rebuild

Famu PHS-912 FIVE Gruppo Parpas Spindle Repair



CHALLENGE

Famu PHS-912 FIVE Gruppo Parpas

Fischer TF2 ST “Evolution 500” two axis milling head

40000 RPM, stator drive, grease lubrication, HSK32 tool interface

This two-axis milling head was factory-installed on a Famu PHS-912 FIVE machine by the Italian manufacturer Gruppo Parpas. Our customer indicated that a coolant component had failed, flooding the spindle which caused the drive to trip the machine off. Our inspection showed that one phase of the stator had burned out. We also determined that the bearing grease had been severely contaminated, and that spindle had several significant dimensional issues as well.

SOLUTION

Our comprehensive plan of action started with a stator rewind. We also performed several grind, chrome plate and finish grind operations to correct severe egging of the rear bearing housing ID & OD, fretted and undersized front & rear bearing journals, excessive runout of the HSK32 taper & face, and brinelling of the ball cage housing ID. We balanced the spindle shaft with all installed components on our Schenck machine, and then reassembled the spindle with the rewound stator and the precision ground components. We installed new ceramic bearings, Belleville springs, tool gripper fingers, o-rings and assembly screws, and finally ran up the spindle to break in the grease and check the vibration and thermal characteristics.

RESULT

Our customer specified an expedited delivery schedule due to their position as a specialized vendor to the United States Department of Defense. Despite the extensive work scope entailed in this rebuild, the team at Northland Tool was able to meet our customer’s expectations and contribute in some small way to the ongoing defense of our nation.

DETAILED CAUSE OF FAILURE

  • Spindle disassembled ready for evaluation for cause of failure and scope of work.

  • Damaged stator wire shorted to ground from coolant contamination.

  • Fretting on the front bearing journal.

  • Contamination in the bearing grease.

  • Contamination that was leaking from inside the spindle through the rear cover.

  • Fretting on the shaft from incorrect stator fit to the shaft.

  • Coolant found in the stator.

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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