The repair process
Five steps, one approval gate. Nothing is replaced without your say-so, and nothing leaves without being run.
Strip and inspect
The spindle is disassembled and every component is evaluated individually: bearings, shaft, housing, drawbar, seals, encoder and motor windings.
Written quote
You get a written quote with the findings and the parts needed. Work never begins until you approve it.
OEM parts, not re-machined ones
Worn components are replaced with authorised OEM parts rather than machined back to size. Bearings are angular-contact spindle bearings in matched duplex sets, ABEC 7 to ABEC 9, from SKF and German and Italian makers only.
Clean-room reassembly
Reassembly, bearing break-in and dynamic balancing happen in a clean environment, because a few microns of grit is what kills a fresh bearing.
Test, then ship
Every spindle is run and tested before it goes back to you, and the repair carries the same full six-month warranty.
Why the details matter
Don't fix what isn't broken. We do not keep an expensive machine shop busy by re-machining parts that should simply be replaced. Authorised OEM parts go back in, from a stock of precision bearings and parts held for the major spindle brands.
Balancing. A spindle that runs at 18,000 or 24,000 rpm magnifies any imbalance into heat and bearing load. Every rebuilt rotor is dynamically balanced after the bearings are fitted, not before.
Break-in. New spindle bearings are run in under controlled conditions before the spindle is tested at speed, so the grease distributes and the temperature settles the way the bearing maker intends.
Ready to send it in?
Tell us the brand, the model and what it is doing. We come back with a written quote before any work starts.
Northsi
- Hours
- Mon–Sat 9 am – 6 pm Eastern
- info@northsi.com