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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
In this DIY video I build a wooden lathe. I used very hard plywood to make this lathe. Building a bit long, but it was worth it. Because I built a very robust lathe...