Grinding or whining noise, heat at the nose, chatter that wasn't there before, a bad taper after a crash, or runout you can see on the parts. Those are the signs it is time to call.
What a good spindle shop does
Checks runout, taper contact and drawbar force on your machine first
Pulls the spindle and rebuilds it in a clean room with new bearings
Balances it and runs it in with vibration and heat tests
Puts it back in and checks alignment
Ask about a loaner or exchange spindle if your machine can't be down long.
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