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

In this video, we do box joint jig easily. I not have guessed that interlocking pieces of wood could be so durable. Wood joints with box joint are very solid. The few att