Cleaning up cast iron tractor weight

[PixMan]

This is one area where carbide insert face mills excel! I have three of them now, having sold the biggest 4" one to Wrustle.

How much spindle power does a Seig X2 actually have and at what speed range? What is the spindle adaptation, R8, NMTB30, or ER collets?

Can you use something like the 1-1/2" one at the right hand side of this photo? It's a 3/4" Weldon shank.