Bigfoot Hunters: Sharpen a Serrated Knife Blade
Serrated knives are often used to cut rope and open cardboard boxes, tasks that can quickly dull the blade. Sharpen individual serrations with an inexpensive diamond hone ($7.96 on Amazon) by slightly grinding the serration with the hone as shown in the video above. You can also use a needle file from any home improvement store, but the result might not be quite as good.
When you sharpen a blade you're removing a small amount of metal from the blade. This removed metal usually deposits itself on the edge and is called a burr. After sharpening the blade you can remove the burr by stropping the blade with a slightly abrasive material such as sandpaper. The guy in the video above strops the blade by using a sanding belt, but you can do the same with a dremel tool or even just sandpaper or an old leather belt with some toothpaste.
Don't worry about perfecting the edge too much; after it, it is the imperfections that make a serrated edge effective in cutting through coarse objects.
via: lifehacker.com
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