Put it on a stand of sorts, secure it with screws nails clamps etc. grab a hammer and a flat bar and give it a workout as best as you can on it. I suggest you find a piece of rail, any size will do for this experiment. all very valid points above, however your own perception/experience is what counts most of the time. Does an anvil weighing 150lbs have an advantage over the 100lbs of the same make, if so, what's the difference? Better bounce back or what? Everyone talks about how weight matters for your application but I've yet to read from any book, forum, or site as to why it matters. I understand the difference in types of anvil except for weight. Everywhere I've looked has advised a larger anvil 75lbs+ but I can't seem to understand why. I'd like to get into tool, decoration, and probably weapon making. So I'm trying to learn more about forging. I do agree that a slightly larger and anvil does have its advantage when it comes to working surface area and mass under the horn(s), but in my conclusion as long as you're comfortable with the size of your anvil. size does not matter! What matters is how, and how well your anvil is mounted. This is the same way most striking and anvils are held down, and they perform extremely well and only weigh in total like 75 pounds. My current anv is about 150 lbs, and it is held to a fabricated, three Legged steel base with bolts and then the legs of the base are bolted firmly to the concrete. I would actually not rather use an Anvil above 400 pounds or so, because the face usually gets so wide that you have to lean over at an awkward angle to get to the far edge, especially if you are like me and you forge with your body perpendicular to the Anvil (kinda like Brian brazeal). If you have An anvil of this size or bigger, and it moves around, that simply means that your anvil is not secured properly. And from my experience, I would argue that a normal, regular sized Anvil (100lbs or so), for normal work, is more than adequate for anything and everything. If you have a 75 pound anvil and it is bolted solidly to the concrete, via our fabricated steel base, there won't be any movement at all. If you have a 600 pound Anvil on an uneven base, it's going to move no matter how you had it. This isn't always achieved by having a bigger anvil. Basically we want to do what ever we can to minimize the amount of "wasted energy" that happens when the anvil shakes, moves, and dances around the floor. In my opinion, you should look at it this way. Think of it like transportation: Would you choose a golf cart to commute 30 miles each way to work? If you only need to go a mile to the store do you need a SUV?
Now if you are just doing light work a few hours a month then it may not make much of a difference to you and being able to move a smaller anvil easier might be the better trade off. You can also use heavier hammers without worrying about breaking the anvil with larger anvils. So if you are doing a lot of work you can tell at the end of the day the difference between working on a 75# anvil and say a 150# anvil. The larger the anvil the more inertia it has so when you hit a workpiece on it more energy goes into deforming the workpiece than moving/bouncing the anvil itself. In general: why don't you forge on a piece of steel foil instead of an anvil? Wow we probably have hundreds of posts on this site discussing anvil weight and the physics of forging I suggest you dig into this forum.
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