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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.
Making Video :
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Did you see this ? Countersink Drill Bit making
In this video, I am making a compass to draw circles. I made a scrap of hard wood. It was a great compass. You should watch this video to learn how to make wooden compass