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Frequently asked questions

Tumbler is the smartest way to sharpen your knives. It’s highly intuitive and brings quick results. Attach any metal knife to the magnetic knife sharpener and use the Tumbler rolling sharpener to sharpen any of your household or kitchen knife by gliding it along the edge of the blade.

The industrial diamonds used by Tumbler are the optimal material for restoring knife blades of any hardness to an optimal basic sharpness. With the coarse diamond grinding wheel you resharpen your knives in the first step and achieve a very good grinding result. After coarse sharpening with the diamond disc, the cutting edge gets a fine finish with the stainless steel honing wheel and the last burr on the cutting edge is smoothed out. Only a few movements to the front and back are needed here to achieve the desired result.

Tumbler works with most knives, including but not limited to kitchen knives, cleavers, most hunting knives with a smooth edge, folding knives with a smooth edge. Blades that are not suitable for sharpening with the Tumbler are those at bread knives and scissors.

For taller knives, for example a large Chinese chef's knife, the Tumbler Rolling Sharpene can be underlaid with a cutting board so the grinder is elevated to the level of the cutting edge.

The first step is to sharpen a new constant angle of 15 or 20 degrees for the first time. Most knives have a certain angle from the factory, which is between 15 and 20 degrees, but it is not always consistent. The first sharpening therefore takes between 2 and 6 minutes. For special blades with high hardness, such as Damascus, it can take up to 10 minutes. From the second use, after the knife has become a little dull again, the re-sharpening takes only a few moves forward and backward, because the grinding angle is already given by the first re-sharpening.

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