To the content  To the main menu

How to Sharpen a Knife with a Whetstone

12/18/2012
noze-prkenko.png

You have probably already been upset about a dull knife in your kitchen. You may also know that a dull knife is potentially more dangerous than a sharp one. A greater force has to be applied when using a blunt knife. If its blade reaches an unwanted place, it may do big harm.

We will try to explain quickly and easily in the following text, how to sharpen a knife without special grinding machine in your own household.

Prepare an oiled or with water soaked stone. We suggest to let the stone soak for 5 minutes in water before use. You will get exact information in instructions brochure delivered with your whetstone.

We do not describe here how to grind a knife with modern knife sharpeners that sharpens with steel. This way of sharpening may generate heat. Excessive heating can temper microscopic layers of steel and change the crystalline structure. The steel is then softer and will wear out quickly (i.e. becomes dull). Moreover, the cutting edge is ground only at one angle. Various knives are sharpened at different angles (15-45 °). However, for grinding in emergency cases they are good.

The original cut should be in good condition if you want to get a good result. The left image shows an edge that can be sharpened this way.

The right picture shows a too dull cut. Such a blade should be left to a professional.

The following picture shows profiles of industrially manufactured blades, the edges of which are ground at more obtuse angles than the rest of blade. This profile prevents accidental breaking out of the blade edge.

Knives can be well sharpened by laymen, but special attention should be paid to a constant angle of the cut/edge. An angle clamp can help you a lot. Modern sets of knife sharpeners have multiple angle clamps for different angles of edges.

The further instructions are written for right-handed. If you're left-handed, it's vice versa.

Place the blade with proper angle on the (from you) farther end of the grinding stone and drag the knife gently to yourself slightly to the right. The blade edge is pointing to you. Drag the blade at constant speed and angle to the stone surface.

Each grinding drag ends when the blade tip reaches the other end of the stone. Be careful that you do not pull over the stone verge. Grind as if you wanted to cut a thin slice from the stone surface.

This way you can grind the blade several times and check the cutting edge from time to time. Do not forget to sharpen the other side of the blade (only applies to blade with double-sided cut) so that the blade is symmetrical.

The grinding angle usually amounts to 15-20° at filleting knives, 25-28° at hunting knives and 35-40° knives for woodworking.

The sharpness depends on the used steel of the blade (its material structure) and on its hardness (specified in degrees Rockwell). The steel for utility knife has max. 62-64° Rockwell.

Knives with steel hardness of 53° have a good cutting performance and are easy to sharpen, but their edge is not very durable.

The resistance is related to steel hardness. The harder the material, the longer remains the cutting edge sharp. But its grinding requires more moves. Here you have to decide if you want to sharpen knives easier or prefer a more durable cutting edge.

Sharpening steel

We can find a sharpening steel probably in every household. It is well suited for fine-grinding, after the knife has been sharpened with a whetstone, as described above. A precision grinding with sharpening steel is not easy because you have to pay attention to the angle of the edge.

 

 

It is important to note here that the sharpening steel is suitable just for maintenance of the edge. A very blunt or jagged blade cannot be sharpened with sharpening steel!

Before you get to the right sharpening with sharpening steel, you should train with a cheap knife and then reach for a more valuable knife. You can support the sharpening steel against the table top, as shown in the video below. Remember to keep the grinding angle and to grind from both sides.

Periods: Kitchen Knife

Like this article? Share

Comments (0)

Recommended products

Similar articles

  • lovecke-noze-61698.jpg Hunting knife

    Hunting is unimaginable without fine and reliable equipment. The best tool to skin hunted game or cut its meat with is a hunting knife. Present day market offers many variations depending on their origin and adaptations. However, all of them should be reliable and firm enough to deal with uneasy conditions of wild nature. In order to be always able to utilize their potential it is necessary to keep them sharp and clean.

  • Fonské nože Puukko knives

    Puukko [pu:k:o] is rather smaller handcrafted knife being very commonly used in North Europe, especially by the Sami people (Laplanders) fishers or hunters who rely on it in harsh polar conditions. Tradition of this interesting tool had begun about 200 years ago in Finland and nowadays it is popular around the world. The knife can be recognized by its typical shape and short blade.

  • Nůž na sushi Sushi knives guide

    If you want to prepare and serve a good sushi you always need a good knife. The special sushi knives are necessary kitchen utensil for Japanese chefs as well as for everyone who do not want to compromise their meal by crushed or wrongly sliced rolls.

  • Druhy kuchyňských nožů Kitchen knives

    Knives are necessary equipment of every kitchen. We use them practically every day so a little knowledge about them can always be useful. For example, how to preserve more vitamins while cutting vegetable? How to keep the knives sharp and how to use them properly? Do you know what for are knives with serrated edge or ceramic knives most suitable?

Comments (0)

Write your own comment


We take care of our customers, their questions of all kinds are answered

Your questions help us to improve. What is as clear as a day for someone, can be for another an interesting novelty. Do not be afraid to ask questions. We are here for you! What we do not know ourselves, we discuss with experts with whom we work closely. The most frequent questions are published here. Your curiosity is appreciated!

  • Do you like shopping with free shipping? If you purchased for at least € 900, you will receive a free delivery to France, Italy, Spain, Austria, Hungary and Poland!

    Free delivery on orders over 900€

  • Is it necessary to deliver the goods quickly? If you manage to place your order of in-stock items by 11.00 am and pay, it will be despatched on the same day. Delivery time within Europe take about 2-5 business days.

    Fast delivery for orders by 11:00 AM

  • Does the delivered size not fit? We exchange the goods within 14 days for another size free of charge. You pay only the shipping.

    Exchange of size within 14 days for free

  • Many of our products are not available anywhere else. These are unique replicas of museum exemplars, designs of ours or our customers.

    Unique items exclusive production

  • On an approx. 800m2 we store items worth about 600 thousand EURO. Choose any item from stock today and it will be despatched immediately. Personal pickup in Kadan can be organized within a few minutes!

    Huge range of products Bestsellers always in stock

Choose a language

Choose a currency

EUR