It is common that a single bo hi will have a peg that is securely held in the anvil whereas the other bohi will feature a flat head and a handle that will be utilized for striking using a hammer.Ī blade that has a fuller will slowly be pulled through these while being hammered this will continue until the whole groove reaches its necessary shape and depth.Īs fullers create the groove, these usually displace the material back to its side to create ridges just around the grooves. If a groove will be applied on either side of the steel, two bohi may be utilized at the same time and this will press the workpiece right in the middle. Generally speaking, the blood groove is a swage with a bevel or cylindrical face and it typically measures around three to six inches in length. These tools are often seen with handles yet feature a variety of shapes for its heads the swages are set in between the workpiece and the hammer to allow the smith to transform the steel into a variety of shapes that would be impossible to achieve using just a hammer.Īs for swage blocks, these are usually like anvil blocks that have a variety of shapes that are forged in them swage is a term from the Old French word souage which means ornamental mould or decorative grooves. It is also utilized for engraving that specific shape into the metal. When it comes to the tools of blacksmiths, the fuller is considered as a kind of swage – it has a distinct shape that is forged right in its surface. The effect of this feature lessens once the blade’s length is decreased. When it is combined with the right distal tapers, blade tempering, and heat treatment, a blade with a bohi can either be twenty to thirty-five percent lighter compared to a no hi blade without sacrificing the blade’s integrity or strength. The form of the blood groove helps decrease any loss of durability and it also acts similar to an I-beam as how it is utilized in the construction industry. The bo hi also provides an excellent tachi kaze (the sword wind sound) when an individual swings the weapon, providing great feedback on its angle as well as the speed of one’s cut. It runs down the length of the weapon’s blade and it functions by making it more lightweight it also alters the balance point of the blade, making it swift, quicker, and easier to wield. The bohi – which is also called the fuller or blood groove – is a beveled or rounded slot on the blade’s flattened side. There are numerous weapons that have been utilized during the warring period in Japan and today, fully functional replicas have emerged wherein these feature certain elements such as the bohi.
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