On YouTube NYC CNC is asking if his mill is correctly leveled, we have talked about this before but it would be helpful to revisit it again. Per the question in the video:

Imagine your Tormach sitting on a huge Granite surface block, like 5 foot cube that is perfectly flat and totally rigid and stays flat no matter what. And is also level in both directions (X Y). If you measured the tram along the X Y it would be in spec with what Tormach produces and ships (This is ideal). Now lift up the right front corner of the mill and slip a 1/16" washer under the mount. It might want to teeter between the now elevated front right and left rear a little bit (maybe 1/32") because the base is pretty rigid, but not completely, it's own weight will cause some twist in the base. Now screw down the mounting bolts, you will pull all four corners down tight and it will twist the base for the full 1/16". Your spindle will not be perpendicular with the milling table. You will see that the table slopes downhill to the left with your level (since the right side is now higher) and then you will add shims to the left bottom side of the Granite block until your table is perfectly level (like you did with the wood shims). However it will still be out of tram because the base is still twisted and all you did was lean the whole thing to the right (base/stand and mill) (and now your Z axis column is not perpendicular with the sky, it's leaning like that pizza tower).

Two things will happen to your mounts, they will not be flat from all the welding, shipping, mill installation (scratches from sliding, etc). And an un-even floor will transmit twist all the way through the stand. You will need to find a happy place for the mill to sit, and shim the base into perfect tram along the X axis, there is nothing you can do for the Y axis (well not with just a wrench anyway).