FAQ - Frequently asked questions

Please klick at the desired question, the answer will appear underneath.

How should I hold the VULKANUS unit while sharpening?

Hold the VULKANUS with either your right or left hand on the upper corner edge of the unit. Be careful not to place fingers (or any other parts of your hand) into the V-shaped opening of your VULKANUS. (See the operating instruction picture – A)
WARNING: Keep hands away from knife blade and out of its path when bracing sharpener and at all other times or serious injury could result.

How many times should I pull my knife through the VULKANUS sharpening rods?

4 pulls is usually sufficient for knives that are sharpened regularly. You should check the sharpness of your knife after 4 pulls and if it’s still not sharp enough, pull through 4 more times. In order to avoid abrasion to your knife you should sharpen with the minimum number of pulls necessary. NOTE: With frequent use of VULKANUS, only knife honing is necessary (nosharpening is required).

Why is VULKANUS a faster sharpening method when compared to sharpening steel or a whet stone?

The patented metal inserts of the sharpening rods are made of special carbide with a very high hardness (approx. 93 HRC). HRC values are used to measure the hardness of materials on the Rockwell scale of hardness. Because this carbide is harder than the blades of most kitchen knives (which have a HRC range in the 50s), VULKANUS sharpens quickly and gives your knife a smooth, even edge. The carbide is also harder than sharpening steel, which has a HRC range in the 60s. When you compare VULKANUS to sharpening steel or whet stones, VULKANUS is much easier to use and it yields consistent, accurate results. Sharpening steel and whet stones require a lot of time and skill and it’s very difficult to sharpen dull knives using these methods. VULKANUS makes it easy and provides the sharpest edge in the shortest time.

How does VULKANUS compare to diamond dust coated sharpeners?

The diamond dust coated sharpeners work like sandpaper and leave a rough edge on the blade of your knife because the sharpening mechanism is diamond encrusted. These sharpeners also require several inserts for different functions (such as sharpening, honing and finishing). This is verytime-consuming when compared to the smooth, sharp edge that VULKANUS can provide in less than a minute.

Is it possible to sharpen serrated knives using my VULKANUS?

Yes, VULKANUS sharpens serrated knives. Just pull the blade horizontally through the sharpening rods in the direction of the serrated edge. Most serrated edges are found on the right side of the knife; therefore you should apply pressure to the right with the handle to the right and pull the knife through the rods from left to right.
(See the operating instruction manual – D)

Is it possible to sharpen Japanese knives with a single-sided edge using my VULKANUS?

Yes, VULKANUS sharpens Japanese knives with a single-sided edge. Just pull the blade horizontally through the sharpening rods in the direction of the single-sided edge. The single-sided edge is usually found on the left side of most Japanese knives; therefore you should apply pressure to the left with the handle to the left and pull the knife through the rods from right to left.

Is it possible to sharpen Japanese knives with a double edge using my VULKANUS?

Yes, use the same sharpening method that is used for regular knives.
(See the operating instruction manual – A, B, C) Frequently Asked Questions.



Is it possible to sharpen ceramic knives using my VULKANUS?

No. Ceramic is a very hard and brittle material. Ceramic knives will damage your VULKANUS and it would also cause damage to the knife. Use a professional service to sharpen ceramic knives.



Why is VULKANUS better than sharpeners that have a fixed angle sharpening mechanism?

Sharpeners with a fixed grinding angle prevent you from achieving the blade angle of your choice; it may create an entirely new angle. The flexible sharpening rods of VULKANUS allow you to follow the original angle of the knife blade as you sharpen. This preserves the knife’s original angle.


What grinding angle can be achieved with my VULKANUS?

The flexible, V-shaped sharpening rods of VULKANUS open to form grinding angles that range from 12° (in the normal, starting position) to 20° (in the widest position). Different knives are manufactured with different angles to serve different purposes and all knives come from the manufacturer with a preset angle. In order to maintain the original angle on your knife you need to vary the pressure while sharpening with VULKANUS.  A filet knife is manufactured with a small angle; therefore to sharpen this knife you should apply light pressure while sharpening so that the grinding angle remains small, at about 12°. A chef’s knife used for chopping is manufactured with a very large angle; therefore to sharpen this knife you should apply heavy pressure while sharpening with VULKANUS so that the grinding angle extends to the full 20°.

How long will the metal sharpening inserts last? Are there spare parts available?

With normal household use, the sharpening inserts will last 2 – 5 years. If you require spare parts you should contact the retailer where you purchased your VULKANUS or you can contact Stallegger Schärftechnik/Salzburg AUSTRIA



Should I do anything with my knife after sharpening it with VULKANUS?

After sharpening your knife you should clean it off prior to food contact.


What is the best way to clean for my VULKANUS?

Be sure to sharpen clean knives only. To clean your VULKANUS use a damp cloth or sponge to remove any food, dirt or small metal shavings. In some cases it may be necessary to clean your VULKANUS in the dishwasher; however, this is not a recommended method for normal cleaning.


Who should I contact if I am having difficulty using my VULKANUS or if I have other questions regarding this product?

Please contact Stallegger Schärftechnik in Salzburg/ AUSTRIA or E-Mail us: office@vulkanus.com.

If you have any other questions about VULKANUS, contact us or look into our Homepage.