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Learn how-to sharpen a knife with an oscillating multi-tool. Be sure to use appropriate care and caution when sharpening a knife. Knives are sharp and they can cut and cause injury. I recommend using appropriate safety protection such as leather gloves, eye protection and hearing protection when using power tools to sharpening a knife.

The sound on this video is a little bit quiet, so it may be necessary to really increase the volume when listening.

However, in my opinion, an oscillating multi tool is relatively safe for sharpening, because using it requires few hand movements. Just hold the knife on the sandpaper, and let the very small vibrations of the tool remove metal from the knife, sharpening it. Move the knife around a little bit, to even out any inconsistencies in the knife and sandpaper.

The general idea is to move from really rough sandpaper to really fine sandpaper. The rough sandpaper removes metal more quickly, but scratches the knife and produces limited sharpness. Use the rough sandpaper to shape the cutting surface. For example, use it to give the knife edge the desired angle. This produces the roughed out shape of the knife. Once you are satisfied with the shape, move to finer sandpaper, of say a higher grit number, say 120 grit. Keep working on the knife until you are satisfied with the edge and the scratches from the previous sandpaper disappear. Then repeat the process and move to 240 grit sandpaper. Hook and loop sandpaper is really easy to switch. The finer grit you use, the sharper the knife becomes when sanded. However, fine grit (high grit number) does not remove much metal, so it takes a really long time to sharpen a knife if you start with really fine grit. Fine grit can be used to touch up a knife edge. After many sharpening’s, the knife edge will lose it`s shape, and it`s necessary to reshape the knife using rough sandpaper and working downwards to fine sandpaper.

I could not find really fine grit sanding pads, so I made my own. I took a triangular hook and loop sand paper, put some contact cement on it, and glued the same shape of say 600 and 1200 grit sandpaper on top. I then sandwiched this between two layers of thick glass, which is really flat, and put enough weight on it to squish the sandpaper. After 24 hours, the glue dries, and you have a triangular piece of fine grit (600 -1200 grit hook and loop sandpaper. I then use this on the oscillating tool.

Another option is to buy fine hook and loop sandpaper and trace and cut your own triangles with scissors.

Another way to bypass this problem is to use a ceramic sharpening stone, which has very fine grit. These work great, but they can be expensive, so I just a flat bottomed piece of kitchen ceramic (please see video link) which also works great and will provide the finishing touches to get the knife really sharp.

Finish up by stropping the knife (please see video link) to remove microscopic metal burs which make the knife dull.

There are lots of different oscillating tools on the market Just google “oscillating tool” or “oscillating multi tool” to find various models. I think many of these tools are very similar, I just bought the lowest cost mode I could find.

The oscillating hand tool is nice because it doesn’t create a potential kickback like a sharpening wheel. This method is slightly less precise, but much safer, in my opinion, and doesn’t require as much skill.

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