Eurotech Lathe Head Spindle Repair
A specialty manufacturer sent us a Eurotech spindle for repair. The spindle was seized when it arrived at our facility. Incoming inspection showed that the rear bearing failed due to contamination. The rear housing was +17 microns out of tolerance. The shaft journals were –6 and –10 microns out of tolerance. It was determined that the housing and shaft would need grind, chrome plated and finish ground to OEM specifications.
After completion of the dimensional work in our grinding department the spindle was put into assembly. The spindle was then run on our custom test stand at top speed and balanced. Vibration readings were taken and a comprehensive quality control inspection was completed. The spindle was delivered to the customer and our sales engineer reviewed the customer’s process and we recommended using the air purge option on the machine to prevent contamination from entering the spindle.
This customer was sending his spindles back to the OEM. His spindles were not lasting and the costs were high so he tried an independent spindle repair house. Unfortunately the company he tried did not work with him on the failure causes, which led to further frustration and costly spindle rebuilds.
He then met us at our booth at the Eastec show and we started working to solve his spindle problems. To date he has not had a single failure on a Northland Tool spindle repair.
Hardinge C42 Spindle Repair
The bearings in this spindle reached the end of their lifespan. The ID collet taper had 10 microns of run out. We were able to kiss grind the ID taper and after assembly it had less than 2 microns run out. The spindle was rebuilt in our clean room and test run at 5000 rpm. When our customer installs the spindle they should be able to run a short warm up procedure and then they will be ready to make parts.
Hardinge T42 Spindle Rebuild
Grease lubrication, 5000 rpm
This spindle needed rebuilding because metal objects were caught between the back of the front flange and the front cover of the spindle. This caused damage to the front cover. We discussed the damage and the repair options with our customer and concluded that due to time and expense reworking the damaged cover was a better option for them than manufacturing new.
The rework of the front cover was completed in our machining department and the spindle was rebuilt in our clean room.
Cincinnati Hawk TC250