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I was looking for a way to get rid of wood dust in the workshop. I thought of making this air blower and I got to work. You can find the details in the video. The PDF download link is below.
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PDF Download : Dust Collector Centrifugal Air Blower
You can use it both to drill 90 degree holes and to drill holes in the depth you want. It also works for joining two woods together, you can see in the video.

With this simple knife sharpening tool, you can sharpen your knives to razor sharpness. It is very easy to make and only takes a few minutes.