Originally Posted by
Snecx
With the readings you got, I cannot tell if your column is off or it is just your spindle head. It could also be both.
You can check (and fix/improve) the perpendicularity of the column to the table first, then only "tram" the spindle head later.
The idea is to fix one before the other, so you don't end up with a spindle that's trammed to the table but the column being tilted like the Pisa tower.
I don't have any specific procedure to suggest, perhaps using the ways Tormach did with their inspection sheet would be a good start.