How To Sharpen a Knife

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There are more non-functioning knife sharpeners on the market than any other product (with the possible exception of no-effort exercise machines). However, there are plenty of ways of sharpening knives that do work. This article points out the most common mistakes and offers links to resources.

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Double Sided Knife Instructions:

Regular Knife Sharpener Instructions:

1. The mistakes that are commonly made in sharpening knives are uncontrolled bevel angles, failure to establish a new edge, and leaving the final bevel too rough.
2. Pick an angle to sharpen your knife. If you already know what angle your knife is sharpened at, you probably wish to sharpen at this angle again. If you don't know your angle but wish to, ask the manufacturer of your knife or inquire at a knowledgeable knife shop to determine what angle is appropriate for your knife. Otherwise, you must make a decision: choose an angle of 10°-30° per side; shallower angles make a sharper edge that doesn't last as long, steep angles are more durable, 15 to 20° is a good compromise: select an angle that matches the use the knife will receive. When shopping for a sharpening system, make sure it provides an edge guide mechanism that supports at least a couple of different angles.
3. If available, use an angle guide to control your edge's angle. Otherwise, you will have to control the angle by hand, which is hard and requires a well-formed perception of angles.
4. For a symmetrical edge, sharpen the knife by dragging it across the lubricated (with oil or water) stone in the opposite direction you would move it to slice a thin layer off the stone. This allows a burr to form and prolongs the stone's life.
5. Continue grinding at this angle until your grind goes roughly half way through the steel. This doesn't need to be precise, just guess. For a one-sided edge ("scandi grind", "chisel grind", etc.), skip to step number 6.
6. Flip the knife over and sharpen the other side of the blade until you create a new edge; the easiest way to determine that you have removed enough metal is to sharpen until you have raised a "burr", a feature that steel will naturally form when one bevel is ground until it meets another. It will generally be too small to see, but you can feel it scraping/catching on your thumb if you stroke away (dull side of the knife to the sharp) from the edge. Finer stones produce smaller burrs, but they are still there.
7. If you do not remove enough metal to create a new edge, you will leave some of the dull edge in place. A dull blade (or a blade with dull spots or nicks) will reflect light from the very edge of the blade. A razor sharp knife edge will not show "bright spots" when you hold it blade up under a bright light. You will need to remove enough material from the sides of the bevel so that the edge stops reflecting light.
8. Flip the knife over and sharpen the other side of the blade in a similar fashion.
9. Remove the resulting burr by "cutting into" a hone (a finer stone). That is, still holding the blade at the same controlled angle, move the blade in the opposite direction you moved the blade in steps 4-8. Some people feel this step should be done with a dry stone for reasons beyond the scope of this article.
10. If you wish, you may further polish or even strop the edge to the desired sharpness. This makes the edge better suited for "push cutting" (cutting directly into materials, pushing strait down without sliding the blade across the object) but generally impairs slicing ability: without the 'microscopic serrations' left by grinding with a stone, the blade tends to not bite into things like tomato skins.