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.
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.
I make a centrifugal air blower. It's a way to get the dust out of my workshop. I am building many parts using 10mm plywood. I use the electric motor that I removed from