[TheForge] Re: chinese airhammer anvil ratios

[Ries Niemi]

Tom- I have a little chinese hammer. It is not a fabricated self 
contained, but a cast iron self contained. It weighs 1130 kg, or 2486 
lbs, and the anvil is 480 kg about 1056 lbs. It is rated as a 40kg 
hammer, for a ram/anvil ratio of 1 to 12.
I have it mounted on a sheet of steel, probably not heavy enough- I 
think it is about 4 x5 feet and 3/4" thick. It is then sitting on a 
rubber horse stall mat, which in turn sits on the 4" concrete slab.
The hammer itself is stable, and it is quiet, but it does send thumps 
quite a distance. So the hammer is very pleasant to use, but my wife 
can feel it in her office 150 feet away. Of course, my property is old 
tide flats, with about 3 feet of soil on top of maybe 4 feet of very 
thick damp clay. When there is an earthquake here, everything shakes 
for a loong loong time. Vibrations seem to travel very well in this 
soil. There was an old log under the road about a 1/4 mile down from 
the house, and we can feel it in the house when a car goes over it.

Judging from what you have  said, I am guessing if I had an even 
bigger, heavier slab of steel, less vibration would emanate out from 
the hammer?