Chief Mcgee - Mass is everything and isolation is wonderful. I first set a 50 lb Little Giant on a 5" slab with wire in it......four months later one of the fasteners had pulled a 10" chunk of floor up with it. The next step was to pour a footing of 24 x 36 x 24" deep - hammer runs like a dream setting on this with 2 inches of hardwood block and a rubber pad. My Nazel runs on a 2 1/2" steel plate (with hardwood and rubber under the anvil) on top of an 8" floor........works - but lots of shock transfer(would be better isolated). My air hammers run on 2" plates with rubber pads under them and work well. The difference in a mechanical and an air hammer is linear guides verses toggle links on a spinning flywheel = off center spinning weight. My advice is to go with a heavy plate like mentioned above -or go with a poured foundation(prefereably isolated from floor by board perimeter). An other option is a wood bunk foundation (but it tends to burn with drops)
Ralph
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