How Would You Upgrade An Old Ox CNC Build Into A Serious Machine?

[JAZZCNC]

But you obviously know better. Next thing you know, everyone will be calling you Trump.

I'm not saying I know better. I know exactly what you are saying and the consequences of heat.!
What I'm saying is what I know to be true from my quit extensive experience of these spindles over a long period of time.

Also just for the record and I've said it many times on here so you can check if you don't believe me. I run my VFD so it shows current not RPM so I can monitor tool wear.
So I know exactly how much it's dropped over the years and yes I agree with you it as dropped from when it was new, but not to any degree that it's a problem.
Because I only ever cut aluminum and pretty much the same grade which is Cast aluminum and same cutters then I've been able to monitor the drop better than most can. So In six years it now pulls roughly 5.6A instead of 5A. It's an 8A spindle so the losses are more than acceptable to me.

Now I've said enough so crack on.!