![]() I notice very well the difference between doing the same number of items using my 91# anvil vs my 165# anvil and both have similar rebound numbers in the ball bearing test. ![]() (This is one reason I do not like crisscross stacks of lumber for anvil stands-they are not nearly as rigid as vertically oriented lumber stands!) However we now have to take the system into account: if your heavy anvil is floating then some of the force will be dissipated in moving the anvil and so a smaller anvil mounted rigidly might work better. If the work piece was between each one when hit, The energy of the strike will substantially go into deforming it on the first, heavy, block and will be split between deforming the workpiece and moving the block with the lighter one. If the small one is struck stoutly it may fly. If the large one is large enough it's inertia and the friction will overcome the impulse and it will stay still. Now take the large piece of hardened steel and set it next to a block of hardened steel that is only a couple of pounds in weight and hit them sideways with the hammer. (I once had to use a cast iron ASO that would dent under a piece of 5160 round stock being worked-ugh!) As we want all the energy to go into deforming the workpiece this is a bad thing. If you hit both the same way with a hard faced hammer the rebound on the hard one will be greater than the soft one as some of the energy will go into denting the soft one. ![]() So lots cover some aspects with a gedanken experiment-though one you could prove yourself empirically-face hardness: think of having two large blocks of steel, one hardened and one annealed and dead soft. Well to get physicsacal you have to look at the entire system Hammer, Anvil, Anvil Stand, Earth
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