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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.
Making Video :
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PDF Download : Dust Collector Centrifugal Air Blower
This is the page that contains the desktop jointer's videos. You can view the 3D model video. You can download the PDF plan.

In this video, I make an adjustable drill bit. I start by using the metal I cut from the M12 bolt. Then I am cutting a Spade Drill Bit. Then I combine the two.