Introduction to Hollow Grinding

A hollow grind is an edge-grinding technique used in knife-making and blade sharpening. As the name suggests, a hollow grind is created when the secondary bevel (the grinding surface) of a knife has been carefully ground to create a concave shape or recess on either side of the blade. This effect can be replicated by whittling inward from both sides of the blade’s edge using a grinding wheel, or belt grinder, until a V-shape is formed.

By creating this V-shaped valley along the center line of the blade, chefs and outdoorsmen are able to enjoy exceptional cutting capabilities due to having a larger cutting edge available. This ensures that even more material can be cut while maintaining control and precision throughout cutting tasks. Also, due to its ergonomic traits, hollow grinds provide users with improved comfort when slicing and dicing foods – thanks again to its deeper than usual bevels that reduce drag and slipping as you move across whatever material you’re working with.

The main benefit of having a hollow grind is increased sharpness – as opposed to other grinds such as flat or convex edges – due to it giving chefs and outdoorsmen greater access into corners and crevices not readily accessible by other types of knives. Hence why this particular method is often considered one of the best for hunting knives, pocket knives, kitchen chopping blades, scissors, chisels, axes etc.

History of Hollow Grinding

Hollow grinding is an age-old blade manufacturing technique believed to be invented by ancient weapon makers. Historically, it was accomplished with a foot-powered grinding wheel and primitive tools such as files and chisels. As grinding wheels improved, the hollow grind took on the shape of a concave stone with abrasive material adhered to the face of the wheel. This enabled faster and more accurate grinding of blades for weapons such as swords, spears, daggers and arrows. Today, machines have replaced manual labor for blade production. The use of computer numeric-controlled (CNC) machines along with multiple cutting heads results in greater efficiency during hollow grinding operations. Hollow ground blades are still used today on virtually all types of cutting tools including knives, scissors, bone saws and many other hand tools.

Benefits of Hollow Grinding

A hollow grind is a type of knife sharpening where the angle of the bevel (the flat area just above the edge of the blade) is curved inwards, relative to the centre-line of the blade. This results in a concave surface on each side instead of an angled bevel. The effect increases the sharpness and makes it easier to honing and strop.

One of the main benefits to using hollow grinding compared to other grinds is that it takes less time to sharpen. The central focus of grind adds rigidity which helps when attempting more detailed edges and more consistent results. Along with increased sharpness, two additional pleasing effects are polished faces, along with increased strength across the cutting edge.

In addition, Hollow Grind can be used creatively for certain applications such as meat carving or fish filleting, providing an extremely sharp and thin slicing structure over traditional slashing or sawing motions due to its superior geometry design. It also works great for carving objects from foam or plastic that require fine details for professional quality edges. Another great use for a hollow grind is removing material from locks or fastening hardware thanks to its superior speed compared to other types of grinding materials.

Overall, hollow grinding offers considerable advantages over many other types of knife sharpening which can be utilised across various activities and applications; creating finely detailed edges while still being able to take plenty of punishment without dulling quickly.

Using a Hollow Grinder

Using a Hollow Grinder is a popular way to sharpen tools and blades due to the uniformity of its finish. The process involves a grinder wheel, usually made of diamond or CBN (cubic boron nitride), that rotates at high speed and spins against a much softer material such as leather or flexible polymer. As it spins against the surface of the material being sharpened, the wheel grinds away material from the edge of tool or blade leaving an even, “hollow” ground shape.

Before beginning, it is necessary ensure all safety protocols are followed. This includes wearing goggles and protective gear such as gloves. Additionally, it is important to ensure that all guards for machine parts are securely in place before powering up the grinder. Locking down items to be sharpened on pedestals and clamps is also recommended, so force exerted by grinding does not cause movement which could result in accidents. After setup and power-up, it may then be necessary to adjust speed settings , depending on type of steel being sharpened and condition of tool or blade’s cutting edge.

Using a hollow-ground grinder requires some skill if it is to achieve desired results; if too much pressure or wrong angle is used during process dulling can occur – instead hardening must be employed gradually over multiple stages until ultimate shape has been achieved. Careful control should also be taken when mounting equipment in order to maintain accuracy; if angles are slightly off it will lead sharply reduced effectiveness of sharpening work done by grinder. Finally, taking breaks during processes ensures greater precision through even application​​​ ​of exact same grinding routine during entire ​sharpening operation rather than unintentional skewing due to fatigue​ .​​

Considerations When using Hollow Grinding

Hollow grinding is a common type of grinding for sharpening blades, usually knives. The process involves the use of a grinder to shave off small amounts of metal from each side of the blade evenly, creating a concave beveled edge. It can also be used to make curved or convex cuts on some metals with the help of a jig.

Due to its nature, hollow grinding is a delicate process that requires precision and care. Factors such as the angle and depth of the grinds must be considered in order to achieve accurate results. Furthermore, in order to keep an even surface across all sides, it is important to move slowly along one pass instead trying to rush several passes at once without proper technique.

In regards to selecting the right hollow grind for your application, look for consistency across all aspects like thickness and trimming rate; Also consider your craft’s purpose before choosing a blade since different blade shapes result in different degrees/lengths of grinds; Lastly make sure you test out a few variations before settling on one type so that you’re satisfied with your final product.

Even with due diligence there can be potential shortcomings when working with hollow grinds– propensity for heat buildup because too much pressure applied means more friction which increases temperature levels; possible irregularities due to improper adjustment levels; easily clogged patterns if used on softer materials like wood. In cases like these it helps to frequently monitor temperatures while active and switch out/potentially dulling blades every once in a while when performing extended works sessions in order to ensure you get expected outcomes desired every time may need changed often .

Different Types of Hollow Grinding

A hollow grind, also known as a “hollow bayoneting” is a type of sharpening technique used with a grinding wheel. This technique uses an abrasive wheel to hone or shape the edge of a blade while gradually making it thinner and sharper. This produces a convex surface on both sides of the blade that can range from very coarse to ultra-fine depths. Hollow grinding can be used on almost any kind of knife, but it’s most commonly used for straight razors and kitchen knives. It works best with blades that have already been moderately sharpened, either by hand or with a grinder.

The textures and depths achievable through hollow grinding depend entirely on the angle and pressure applied during the process. A wide variety of grind textures are possible from soft, easy grinding curves to a fine finish that can hold an edge for longer periods of time. Regardless of the intended use, this style of sharpening will leave behind extremely hard edges that remain reliable for extended amounts of time when carefully cared for.


A hollow grind is a type of grinding technique used to shape material, most commonly in metalworking and woodworking. It is used to create a concave surface, as well as providing sharpness along the edges. This technique is widely used for many tools such as knives, plane blades, and chisels, which require sharp edges and precise shapes.

Hollow grinding has several advantages when it comes to metalworking or woodworking—it helps achieve excellent accuracy due to its repeatability and precision; it creates sharp edges with a great deal of stability; and it creates smooth surfaces that are very useful in many applications. Additionally, hollow grinding helps preserve the workpiece’s integrity as very little material needs to be removed in order to create an accurate shape.

In terms of overall importance, hollow grinding stands out as having an integral role in almost every facet of metalworking or woodworking. The ability to accurately shape materials with consistency, precision and accuracy is an invaluable asset when creating art pieces or tooling processes. This type of grinding not only provides superior results but also decreases production time while ensuring quality craftsmanship. As such, hollow grinding is an indispensable part of any project involving machined parts or intricate patterns on wood or metal surfaces.