Mitsubishi Spindle Repair
Mitsubishi machine tool referred an aerospace customer to us. The customer had sent the large milling spindle to one of our competitors and the spindle failed shortly after installation. Our spindle repair competitor refused to cover the spindle under warranty even though the spindle failed within days of the installation.
When the spindle arrived we were tasked with finding the cause of failure. Here is what we found:
The front shaft journal was egg shaped and badly scored causing stress to the bearing
The front housing was badly egg shaped and scored causing stress to the bearing
The damage to the shaft and housing were indicative of extremely poor bearing installation practices.
The bearing spacers were scored during the installation causing a non-parallel condition which leads to premature bearing failure.
This spindle had a hydraulic rotor. It was also installed improperly causing scoring to the shaft and rotor and bending the shaft.
The rear cover was in contact with the rear nut causing metal debris to enter the bearings.
The bearings were not installed in the proper orientation causing a lack of lubrication to the front quad set of bearings.
As you can see our competitor was not equipped to perform this repair and actually caused additional damage to the spindle when they worked on it. We have been repairing spindles for over thirty one years and have gained the knowledge and equipment to perform your repair properly. Don’t loose money and machine production time to a company who offers empty promises that they are qualified. Ask for references, warranty policy and make sure you feel comfortable with the company you’re dealing with before you send the spindle for repair.
Smith Renaud BA-0025 Spindle Repair
Northland Tool & Electronics has been rebuilding these Smith Renaud spindles for our customer for over 15 years. When we first started our repair program with them we would get 2 to 4 spindles to repair per month. We worked closely with them to eliminate main causes of failure. As you can see in the picture we added an air purge system to the front and rear of the spindle along with making changes to the labrynth systems. We also reconditioned the shaft and housing journal fits to bring them back to OEM specifications.
15 years later we receive 1 spindle every 2 to 3 years from them to repair. We have earned a customer for life and they have saved countless dollars in spindle repair and increased output due to less machine downtime and better part quality.
This spindle was exchanged with the OEM the last time it failed. Our customer came to us because it failed prematurely and the OEM would not cover the repair under warranty.
When we received the spindle and evaluated it we determined that when the spindle was exchanged the new spindle they installed had air purge capabilities. Their machine did not have this option and the OEM did not plug the air input hole. This gave coolant a direct path to the bearings and led to the spindle failure. We placed a removable plug in the air purge and gave instructions to our customer for the installation of an air purge system.