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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.
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Did you see this ? Countersink Drill Bit making
I am making a jig to glue sandpaper. A great tool for making perfect sanding belts easily and quickly.

In this video I build a 20cm drill powered disk sander. It is a powerful disk sander. There is a miter sanding attachment and there is a circle sanding attachment. You ca