What purpose does a fuller serve in a knife? Is it just decorative or does it do something functional?
You can check the answer of the people under the question at Quora “what is a fuller on a knife“
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Written by: Josie
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What purpose does a fuller serve in a knife? Is it just decorative or does it do something functional?
You can check the answer of the people under the question at Quora “what is a fuller on a knife“
About Josie
On a dual tempered blade the fuller is usually in the softer steel, when the harder blade edge impacts anything, the shock from that travels out from the impact point towards the softer spine, then it dips into the fuller and will travel the length of it. Reducing shock effects and overall reduce the chances of breaking because of shock. It isn’t flawless, it only takes the edge off basically, if there is internal damage in the sword it won’t stop that having any effect but it might last longer.
On the katana the fuller, called a bohi, is used to measure the accuracy of the cuts made in training. The sound it makes is called tachikaze. Here is a quick video on that. If your sword doesn’t sound like this and you impact someone or something the chances of bending or breaking the blade is quite high. Everyone I have ever talked to about tameshigiri has straightened a blade before. It’s very common in the early days of cutting practice.
If the sword was out of alignment or off it’s index that sound wouldn’t happen, so this is a very handy and easy way to tell if your technique is correct and straight. It’s not the be all and end all method of measuring alignment though, it’s just an indicator
I agree with User-9331817617460566201 about it being less useful on smaller blades with the exception to a khukuri. Khukuri’s are pretty much designed for surviving hell. In some cases they are designed to cut cars apart in hell. Reinforcement of the structural shape, reduction of friction in cutting and slightly lighter blade for the size, these can be useful for a khukuri designed to lop off heads and go through car bonnets. Just don’t ask me why people chop cars up with a khukuri.
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When we were kids we told each other that these were blood grooves- I guess in theory if you left a knife, with a fullered blade, in someone more gore would leak out.
I now understand it is to increase the strength of the blade while making it weigh less.
They also look pretty damned tactiicool.
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It might allow you to get a bigger/wider blade from less material.
But I agree, not much affect on a knife os small size.
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Is strengths the blade and makes it lighter. Think of a I beam and full flat bar. The I beam with same outer dimentions than a full bar is much lighter and tougher. In some cases fullers are also decorative or the grove is made to hide a mistakes in welded steel.
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Thank you so much for not calling it a Blood Groove. To answer your question, it’s mostly ornamental on shorter blades. On swords, it serves to reduce weight, but this isn’t always an advantage, it just depends on the application for the blade.
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A fuller is something that is decritive and functional
the reason people people put fillers on the blades is to make it lighter so it can be handled more easily and it’s appealing to the eye (for some people) I hope this helps.
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