I bought a new Taig mill from Deepgroove and the spindle doesn´t run easily and it gets very hot after just some minutes on 8000 rpm. It doesn´t help to loose the nut at the top, so I need to know if this is normal for new spindles and if it will improve after I have used it for a time. Or could this damage the spindle in any ways?

Are there anything to do with a problem like this?