Running-in a new air cooled spindle

[JonE]

Anything around 100Hz will be fine if you are just warming it up with no load, does it use steel or ceramic bearings?

Thanks, just steel bearings. The seller is recommending 2-3 hours no load run-in with increasing speeds every 20-30 mins, I think just to redistribute the grease in the spindle bearings after sitting/shipping etc..

Cheers, Jon.