With a more powerful motor in place and counterweighted, and new 387oz-in steppers outfitted to my taig mill, my next obstacle is tackling the machine rigidity.

I've seen posts about filling benchtop machines with composite epoxy concretes, but have never seen anyone attempt to fill a machine with lead. I have access to an abundance of lead ingots (~4 tons) and a few small melting pots. This all just occured to me while at work, but does anyone recognize any potential issues with filling the taig mill's y and z columns with lead?.

The only issues i've thought about have been shrinkage as the lead cools, and the OEM z column support may become inadequate to hold the column in place. Any other ideas?