Milling Machine Stiffness and Damping

I’ve just added a significant plate to stiffen the column on my milling machine and thought it might be of interest:

Stiffening bracket improves the quality of the surface finish

This created a volume at the bottom of the column and I made some sand bags to add some damping

The vibration damping is probably very small, but without this there is little to no damping in a machine tool.