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I'm sure that what actually happens is way more complicated than that, but that's the basic Idea of it. This is much like why even a tighly packed deadblow hammer doesn't rebound hardly at all. If you did just weld around some plates, after the initial hit on your workpiece, the top plate would flex, dissipating energy, until it hit the next plate, and so on, until there was no more energy left to work with. Unless the welds are full penetration, there will always be a gap between the plates. This would make them one solid block anyway, although with messier grain and possible inclusions/porosity. For a Rusty style hammer, you may find that the maximum efficiency is reached with a different (likely lower) ratio due to other losses of efficiency within the system. That was for steam hammers doing industrial work with industrial foundations. Chambersburg Engineering published data showing that maximum efficiency was reached when the anvil wieghed 20x the ram. That is accomplished by the anvil which needs to be large enough to resist moving. In the world of hammers, efficiency is all about resisting the forced exerted by the ram and transfering that motion into the work piece. The result of this is that you are forced back into your seat during the acceleration stage of travel. You (the filler material) tend to stay at rest while the car (anvil tube) accelerates. This is the exact same thing that happens when you accelerate rapidly while travelling in a car. If not, then the filler material will stay at rest while the housing moves. Since objects at rest tend t stay at rest when impacted, the mass resisting the force of the ram must move as a single unit. The reason the tubes filled with objects approach is less desirable than a solid block has to due with the fact that those loose objects will not move with the housing when the ram contacts the anvil. I'm curious as to what everyones thoughts are on the matter. Would it transfer the same? Is it just the mass that dictates how efficient it is? Llllllllllllllllllllllllllllllllllllllllllllllllllllll Llllllllllllllllllllllllllllllllllllllllllllllll Llllllllllllllllllllllllllllllllllllllllll Now how would that same energy transfer if instead of it being a pillar it was a slice of a pyramid with each prospective filler: So now we have three identical in appearance anvils for a power hammer, which one works best and why? But now imagine the three following anvils, the 6”x36” square tube filled with sand and topped with a heavy plate, the 6”x36”square tube filled with lead (and for the sake of the example lets say stacked blocks that you somehow had the time to acquire that much lead and cast it into bricks that are close to the inside tube size so in essence its solid) topped with a heavy plate, and the last filled with 1/2”x36” square bars topped with a heavy plate. So after looking at a number of threads and reading through more pages and posts than i can count i've decided to ask the question! how does the anvil work on home made power hammers? everyone says that solid is better, of this i have no doubt, but my question is more specifically how does the blow transfer and reverberate through that material? for instance, in the helve/krusty/rusty style of hammer everyone wishes they could their hands on a rail-car axle due to its substantial girth and solid weight, so its easy to see how the force from the tup would travel straight into the piece that you are working on and down into the anvil.
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