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Dao knives often take the form of cleavers used to chop foods in the kitchen. The single curved edge chops effectively and the dull, straight spine improves safety. The leaf knife blade shape features a sharp edge that curves upward and a dull spine that slopes downward to meet it.
Mark Wilson's Kanagawa Blade has a serrated edge carved by jets of water
Arcform's Slimfoot Auto Review: This Knife Made Me Fall in Love With 154CM Again - GearJunkie
Arcform's Slimfoot Auto Review: This Knife Made Me Fall in Love With 154CM Again.
Posted: Mon, 05 Feb 2024 08:00:00 GMT [source]
Tougher steel in thicker stock is more difficult to break. It is important to analyze where the knife broke and why to determine the source of the failure. I showed this process in an article on stress risers, which are inherently weaker parts of a knife because of its design. Read that article to learn more about how to avoid stress risers in knife design.
Jay Fisher's Knife Patterns and Designs
Thinner and more acute edges cut better than thicker and more obtuse edges. On the flip side, as described above, the thicker and more obtuse edges have better resistance to chipping and rolling. One user may be fine with a very cutting ability knife while another will chip the edges or break the knife. And it is also dependent on the intended application, from choppers to kitchen knives to “general use” folding knives. It’s difficult to give broad recommendations, it is up to the knifemaker and customer to determine the best balance.
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A little difference in temperature can have a big effect on the results. Each steel type has its own unique combination of time/temperature cycles that will result in a blade of superior strength and cutting ability. Use a red, waterproof marking pen to ink in the blade prior to each new grit size. I use 60-grit belt for rough grinding the blade, then go to a 120-grit belt, which creates a fine enough finish prior to heat-treat. Use an OptiVISOR or other headband magnifier o check your progress.
Knife Design 101: What are Line and Flow?
Biomorphism is an artistic and design movement that incorporates natural forms for decorative purposes. It emerged in the early 20th century and features swirling motifs and elongated vegetal shapes. Influential figures like Saarinen and Mollino promoted biomorphism.
Unveiling the Beauty of Silvered Glass: A Historic Technique with a Modern Twist
Another way to separate the blade from the bar is to scribe two blades on the bar stock, with the point of the first blade meeting the point of the next blade on the bar stock. As shown in the accompanying photo, grinding the profiles will separate the two blades. An advantage, for myself, to forging is the energy created by the process. I get sick and tired of grinding and sanding inside my shop.
Knives are not tools that will see only one repetitive task, but used by people that will use it in a variety of ways. A steel is “tough enough” until it is used in a way where it wasn’t. Humans, unfortunately, are very unpredictable in how they will use knives. With custom knives it helps to have a discussion between the maker and customer. Or for the customer to determine their own use case before choosing a knife. The mechanisms that control chipping of edges are somewhat similar to broken knives.
Common knife handle designs
How a knife design starts and stops at the point and butt has a lot to do with flow. Sometimes flow is hard to achieve even when you have a good design in your head. Edge-holding ability is almost entirely dependent on a relatively high hardness. I would estimate that 95 percent of handmade knives are between Rc on the Rockwell hardness scale. The specifi c alloy elements in some types of steel will allow them to have more strength than other types at the same hardness.
How to Create Damascus Patterns
The combination of straight edge and small curve make the knife very effective at skinning different kinds of animals. However, the lack of a sharp point means the knife cannot be used for piercing anything. The wharncliffe knife blade shape features a thick blade, a straight edge, and a dull back with a gradual curve. Similar to the sheepsfoot blade, the back of the knife curves downward, but it has a gentler curve, rather than a sudden curve at the end.
Roman Landes likes the term “edge stability” to describe an edge’s ability to resist rolling and chipping. A combination of tough steel at high hardness provides the best resistance to rolling and chipping, allowing the design of fine cutting knives with thin edge geometry. I recommend my linked article and Roman’s book if you want to learn more about edge stability.
When the file is pushed, as in normal filing, the teeth are more apt to dig into the work and leave a rough finish. A standard mill bastard file works best for getting a smooth finish. A double-cut file will remove material quicker but will leave small ridges that have to be worked out with the mill bastard file. Let’s pretend that I numbered those slabs from one to four as I cut them off the chunk.
The blade shape can have a huge impact on the purpose you need the knife for. That’s why it’s important to know your knives so you can choose the right one. Flat ground blades have a profile that tapers from the thick spine to the sharp edge in a straight or convex line. Seen in cross section, the blade would form a long, thin triangle, or where the taper does not extend to the back of the blade, a long thin rectangle with one peaked side. There have been some general references to heat treatment in this article such as the requirement of sufficient hardness to avoid rolled edges. While some knifemakers spend a lot of time looking for the “ultimate” heat treatment, a major element is simply avoiding the many potential issues with heat treating.
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