Important: I would like to keep the PDF documents and plans I produce free of charge. Please support me with your likes and comments.
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.
Making Video :
Go to this video's Youtube page and make a comment.
Did you see this ? Countersink Drill Bit making
This is the page that contains the desktop jointer's videos. You can view the 3D model video. You can download the PDF plan.

I make a wood cutter from a angle grinder. This wood cutter looks like a circular saw.