Remove drawbar wrench before turning on vertical milling machine spindle.
Hmmm. Stupid machine shop tricks...with vertical instantaneous learning curves...
Even with it set as slow as it will go and being cautious, do not drill a 1-1/4 hole through an 8" thick 50lb block of lead with a drill press.
The image of that block of lead tearing itself loose from the hold down clamps and swinging around on the bit then snapping the bit and sailing past my shoulder at a bazillion mph with part of the drill bit jammed in it and hitting the opposite wall of the shop before falling to the floor is permanently etched on the inside of my skull. Lesson of the day: The first several inches are fine but after that, it seems that cooling lead tends to contract and will grab onto a drill bit and won't let go.