What kind of temperature would be considered normal?

I also found a good instructional video about spindle bearings

https://www.youtube.com/watch?v=grUdsTTRGl4&t=3244s

I was really careful not to over tighten the lock nut. I only went as far as removing any play and no further (I thought anyway) so probably almost no preload on the bearings. On startup I waited a couple of minutes between raising spindle speeds so that I didn't stress the parts too much, but it go...

Hoping someone can give me some advice. I have a Mach3 converted Novamill, which after some very minor use started making some horrible sounds from the spindle bearings. So I got the specs and installed new bearings (correct specs) packed with spindle grease (not the Denford specified grease) I did ...