Blog #10 - Common Knife Edge Profiles

When it comes to choosing the right knife for a specific task, most people tend to focus on the blade material, handle design, and overall appearance. However, one crucial aspect that is often overlooked is the knife edge profile. The edge profile of a knife can greatly affect its functionality and performance, and the equipment and techniques required to keep the edge sharp. In this comprehensive guide, we will delve into the world of knife edge profiles, their types, and how to select the right one for your needs.

What Are Knife Edge Profiles?

When it comes to knives, there are a plethora of different shapes and styles to choose from. From chef knives to pocket knives, each one is designed with a specific purpose in mind. One crucial aspect to consider when selecting a knife is its edge profile. But what exactly is a knife edge profile, and why does it matter?

Simply put, a knife edge profile refers to the shape of the blade's sharpened edge. It is the part of the blade that comes into contact with the object being cut. The way an edge is profiled can greatly impact its overall performance, making it crucial to understand the various profiles and their unique qualities.

Edge profiles are designed to optimize the knife's performance for specific tasks. It is essential to understand the type of cutting you will be doing before selecting a knife. For example, if you need a knife for everyday kitchen tasks, a plain edge may be the most practical choice. However, if you are a survivalist or bushcrafter, a Scandi grind may be more suitable.

The edge profile can significantly impact a knife's performance and its suitability for different tasks. Understanding the various edge profiles and their strengths and weaknesses can help ensure you choose the right knife for your specific needs.

Common Edge Profiles

1. Flat Grind

The flat grind, also known as a "V" grind, is perhaps the most common and versatile edge profile. It has a straight, angled bevel that runs from the spine of the knife all the way down to the cutting edge. This type of edge is ideal for general purpose knives as it offers a good balance between cutting performance and durability. It is also easier to maintain than other edge profiles.

2. Convex Grind

The convex grind is characterized by a curved bevel that tapers smoothly from the spine to the edge. This type of edge profile is often found in specialised knives such as bushcraft or outdoor knives. It is designed to provide superior cutting performance and excel at tasks such as slicing, chopping, and skinning. The convex grind also offers a thicker edge, making it more durable and less prone to chipping. It can be more difficult to sharpen than other edge profiles due to its curved shape.

3. Hollow Grind

As the name suggests, the hollow grind has a concave shape, with the bevel starting closer to the spine of the knife and tapering towards the cutting edge. This type of edge profile is commonly found in kitchen knives and provides excellent slicing and chopping performance. The hollow grind creates a thinner and sharper edge, making it perfect for tasks that require precision.

4. Scandi Grind

The Scandi grind, also known as the Scandinavian grind, is a traditional edge profile originating from Scandinavia. It features a single bevel that runs from the spine to the cutting edge, with the bevel ground at a steep angle. This edge profile is commonly found in bushcraft and outdoor knives and is ideal for tasks such as carving, woodworking, and firestarting. The steep angle of the bevel creates a very sharp and strong cutting edge.

5. Sabre Grind

The sabre grind is a type of asymmetric edge profile that has a thicker and stronger spine and a narrower bevel on one side. This edge profile is commonly found on tactical or combat knives as it provides a strong and durable cutting edge that can withstand heavy use. The longer and more gradual bevel on one side also makes it easier to sharpen the knife in the field.

6. Chisel Grind

The chisel grind is characterized by a single bevel on one side of the knife and a flat edge on the other side. This type of edge profile is commonly found in Japanese knives and is designed to offer very precise and controlled cutting performance. The single bevel makes it perfect for tasks that require a high level of accuracy, such as woodworking, lettering, and paper cutting.

Each edge profile has its own advantages and is designed for specific tasks and purposes. Consider the type of tasks you will be using your knife for and choose the edge profile that best suits your needs.

Selecting the Right Edge Profile

Now that you are familiar with the various edge profiles, it's time to choose the right one for your needs. When selecting an edge profile, consider the following factors:

1. Purpose

The first thing to consider is the purpose of the knife. Are you planning to use it for everyday tasks, or do you need a knife for specific activities? Different edge profiles excel in different tasks, so it's essential to choose one that suits your needs.

2. Steel

The steel of the blade also plays a significant role when selecting the right edge profile. For instance, a softer steel is not suitable for heavy duty tasks such as chopping and batoning wood. You can read our comprehensive knife steel guide here.

3. Maintenance

Some edge profiles require special sharpening equipment. For example, if you sharpen a convex grind with a regular flat benchstone, you will simply reprofile the knife and remove the convex edge. Instead, you should use a sharpening system such as KME, which offers a curved rod for maintaining convex edges.

Consider the specific equipment and techniques required to resharpen your chosen edge profile, as well as the amount of time and effort you are willing to put in. Some edge profiles are a quicker and easier to sharpen than others.

Understanding the different knife edge profiles and their purposes is crucial in choosing the right knife for your needs. Don’t forget to consider the purpose, steel type, and maintenance when selecting an edge profile, and make sure to regularly maintain and sharpen your knife to keep it in top condition. By following these tips, you can ensure your knife performs at its best.