Re: Al Extrusion Vibration Damping

The damping qualities don't come from the mass of the system. All
that does is change the resonant frequency. I doubt lead would be
anygood. Polymer Concrete is very good and increases the stiffness of
the system. Sand works well but adds no stiffness. Sand also gives
the option of emptying it out so that moving the machine would be easier.

http://www.mech.utah.edu/~bamberg/research/precisionDesign/STG.html