My 3b nazel sits on a wood base on my 5" slab floor. It hasn't cracked the floor yet, but I also don't use it every day. it does however pound the floor hard and you can feel it in the house 50' away.
I think alot of it depends on what the ground under you slab is like. At my old shop you couldn't feel the hammer 10' away standing in the shop with the hammer sitting on the same wood beams.
I'm going to be digging a pit and doing a proper foundation soon. Want to use it more often and don't want the neighbours fine china falling of the shelves.
I'm looking at using something like a concrete septic tank. Then using thick rubber bought from an industrial rubber supply place, then either forming a concrete block on top, or possibly a steel box filled with sand compacted and a steel floating cap on top (easy to remove if I ever move to a new shop/house, I had a friend who spent big $$$ on a foundation for a 400lb denmore hammer that had to move 2 years later).
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