Watch a vid on how wusthof knives are made. Convex grinds are ideal for chopping and splitting tools such as axes and machetes. Many knife aficionados consider a convex grind the strongest and most durable profile. You can clearly see that the flat grind has a corner at the edge of the edge. There isn't much need to belabor the basics. A convex edge features a bevel on each side of the blade, slightly rounded (convex) as they taper to form the edge. 1. Instead of curving inwards like the hollow grind, a convex grind has a rounded curve that comes to a point. Such a shape keeps a lot of metal behind the edge making for a stronger edge while still allowing a good degree of sharpness. It would give you a blade with plenty of strength behind it to stand up to chopping. If you look at a knife blade that is ground in the convex style you will be hard pressed to find a level of any type of the blade. This grind is also sometimes called a full-flat grind or a V-grind. Convex edges can be some of the most difficult to sharpen, but the edges are extremely durable and sharp. Initially, it doesn’t matter what kind of motion you apply, so long as the bevel stays flat. This is a popular grind you don’t come across that often because it is hard to produce consistently. Flat grinds are sturdier, and simple to sharpen on basic equipment. Convex grinds used to be the norm until about the sixties in Germany and still are the norm on Japanese single bevels, though beta togi (flat grind) is becoming more and more common. A convex ground blade is a specific type of knife finish, or grind. Convex grinds are very specialized and are commonly found on heavy-duty chopping tools such as axes and machetes. A Few Definitions. There are many kinds of grinds out there, including the hollow grind, full flat grind, chisel grind, sabre grind, convex grind, and scandi grind . The flat grind is the simplest grind pattern for any knife. The grind is the functioning part of your knife for most of its jobs and determines how well the knife will cut and even retain sharpness. Not an easy task. In conclusion, the edge, blade stock thickness, and beveling presents similar trade offs for the designer as the other design decisions. A popular knife with a hollow grind is the Desert Warrior Kalashnikov. Convex edges are truly difficult to accomplish by hand on a flat stone and are considered a highly specialized grind. ; Flat grind — The blade tapers all the way from the spine to the edge from both sides. Hollow Grind A grind which has led to a lot of questions is the convex grind. The primary grind may be concave, flat, or convex. With a traditional, flat sharpening stone, one must repeatedly and consistently follow the contour of a rounded, convex edge with the flat surface of a stone. The scandi doesn’t begin tapering until closer to the edge. It is a true multitasker and can be used for filleting, splitting firewood, and a whole lot more. Flat grinds are great for whittling and general use. The Real Steel Bushcraft Plus Convex 3720 is a great bushcraft knife, with a convex grind. Award-winning American Bladesmith Society master smith Jim Crowell won the 1st Annual BLADE Show World Championship Cutting Competition in 2003 and was inducted into the ABS Hall of Fame in 2016. “My opinion for the best blade geometry is a full flat grind with a convex edge,” Crowell begins. Why The Scandi Is NOT The Best Grind For Bushcraft Knives James Morgan Ayres uses a Nikov knife with a convex-ground blade to make a fish spear. A true flat grind is somewhat rare on modern knives, due to most manufacturers including a secondary bevel. Real Steel, however, demonstrates that they are perfectly capable of doing so, and that for such a competitive price! You should also have what looks like a hamon on a katana. After all, you miss the cornered shoulder of the edge. However, if you use a handheld diamond whetstone and the above mentioned felt-tip trick, it is fairly easy to sharpen the convex edge, but as with everything, practice makes perfect. Concave – shapes that curve inward, like an hourglass. Convex grind-is a continuous curve from edge to spine, there is no bevel like on other grinds. Types of Knife Grinds. Convex Grind. Convex: For me, the best overall grind, day in and day out, is convex. Full Flat. To properly sharpen a full convex grind, one must remove material from the entire blade. for chopping vegetables. However if you have access to a specialist knife belt sharpener, convex grinds produce wonderfully satisfying edges on knives. I was given affixed blade knife to sharpen and as soon as I started I realized it has a convex grind on it. (ML and AE Ayres image) Geometry: The intersecting planes of the Scandi grind create a wedge. Convex. In the last few months, I've bought a Zero Tolerance ZT-0301, RAT H.E.S.T., Scrap Yard Scrapper 5 LE, and now I'm getting a Tank Buster. So my options are to grind it to a V or figure out how to do it with my KME. This is characteristic of straight razors, used for shaving, and yields a very sharp but weak edge, which requires stropping for maintenance. No Grind. Convex edge is just the edge of whatever grind you have the edge on. This type of grind is not very durable and can dull fairly quickly. Finish on a strop if you have one, or steel ever so lightly. A convex edge is where the bevel on each side of the blade is slightly rounded (convex!) Like just about everything in knife … Also, the knife material needs to be thicker to achieve a relatively sharp and efficient cutting edge. The Convex edge is ideal for tactical knives and kitchen cutlery for various applications: outdoor activities like hunting and fishing, everyday use, and … This raises the price of the knife. Rather than tapering with straight lines to the edge, the taper is curved. The grind of a knife is the method the knife maker uses to put an edge on a piece of steel. Hollow grind — a knife blade ground to create a characteristic concave, beveled cutting edge. As of late all of the knives i have been making i have been doing what i believe to be a convex grind on. don't mind the promo on the mouse pad. 10. Not everyone likes the same grind for certain tasks, so the “best” grind can be relative to the individual. Convex – shapes that curve outward, like a football.. Spine – the back of a blade, opposite of the edge.. Primary Bevel / Grind – Where the knife first begins to narrow into a cutting edge from the thickness of the main stock of the blade. Here the grind runs from the spine (the top of the blade) towards the edge without interruption. Another drawback to the convex grind lies in the area of aesthetics. While what follows is by no means the full extent of knife grinds, these are basic grinds. It looks like a scandi grind, but instead of a straight grind, it’s curved. What it is: On a convex grind, the sharp edge is produced by symmetric, gently curved surfaces. The convex grind is very strong, the hollow is great for cutting, with the flat grind represents a balance between strength and sharpness. Why would we include a no grind category in a knife grind post? The full convex knife grind is the opposite of the hollow grind tactical knife type. On the other side of the spectrum from the concave bevels of the hollow grind is the convex grind — also known as an “appleseed,” “Moran” (after the legendary custom knifemaker Bill Moran), or “hamaguri” grind. The grind stands for the way the edge of your knife is sharpened. Difficult to explain, which is why we have made the picture shown above. I'm fairly new to buying knives and dropping more than $70 on a knife. I read that the Tank Buster is a sabre grind with convex edge. 9. 7. The convex grind, done properly, does strengthen the edge of the knife. Flat grind knife blades are a V-shape on the cross section, with one straight line from the edge up to the spine on each side of the blade. The convex grind is probably the best grind for everyday use. Several of our knives have a convex edge (axe edge). (If you weren’t going for a convex grind, you would have flat bevels, otherwise known as a V grind and your blade would look like fig. The grind, of course, is what makes a knife sharp. You should now have a convex edge. All knife grinds are good if matched to a particular application. An appropriate grind depends upon a blade’s intended use and the knife steel composing it. Asymmetrical Grind Convex grinds can be reproduced on a slack belt sharpener, but these machines are quite difficult to use, noisy and messy and not so suitable for home or kitchen use. It … Convex edge. A convex grind, especially when it is a full convex grind, must be done correctly at the point of manufacture. Most other grinds are a variation or combination of these basic grinds. A scandi grind (or V grind) (also called a scandinavian grind) is a knife edge with a wide flat bevel that runs to the edge of the blade. Slightly convex grinds are sturdier still, and hold an edge very well. Where the curvature begins (high or low on the blade) can produce a full convex, a saber convex or even a Scandi convex grind. If properly carried out a convex grind knife can have a stronger edge and still cut smoothly. Sharpening the Scandi grind. 2. Flat grind and other edge types tend to require more frequent sharpening as the knife dulls, therefore decreasing the life of the blade. They can be difficult to sharpen if you do not have experience and or access to several grades of slack sandpaper belt however. Rather than two flat, intersecting planes, the convex grind’s primary bevel gradually curves down to the cutting edge without a discernable secondary bevel. T o sharpen the Scandi grind by hand, place the bevel flat to the sharpening stone and work on the whole edge. Concave, or hollow, grinds are quick to sharpen, but delicate. As such the blade gets that famous convex shape that characterizes the convex grind. Chris "Chris Issariotis" < [email protected] > Steve's Comments: The convex grind is actually my personal choice for a large fixed blade knife with a thick stock because I know that I'll never thin the blade out significantly enough in my lifetime to weaken it, but for a somewhat smaller and/or thinner knife I see more merits to the Scandi (i.e. Peel the tape off and wash your knife. This kind of edge can seem difficult to sharpen. Convex grind and Convex edge are two different things. Think of how a cave curves in, or think "con-cavity". Convex grind. Since the bevel on scandi grind knives is so large and flat it is pretty easy to get the right angle for sharpening. I am grinding the knife around 1-1.5" below the end of my flat platen giving the blade a nice gentle curve from the spine to the cutting edge. I don't know much, yet, about different knife grinds and edges. For a knife like this, you might choose 20° per side as the final angle. Convex edge on a FFG is hard to beat. Sharpening a convex edge can be a real pain in the keister. How to sharpen convex grind with KME using standard guide rod? Machine grinding doesn’t really allow for thin, convex grinds if you want to mass produce at low costs. Unlike many knife grinds such as a hollow grind, a convex grind curves outward rather than cutting inward along the edge of the knife. The only convex grind that I do is on the secondary grind but if you wanted to do a convex grind all the way out to the spine, you could. as they taper to form the edge. 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