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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
If you are tired of knob making methods, this new method is for you. We make wooden knobs using a table saw, not a column drill. Watch the video for cute and useful knobs

With this simple knife sharpening tool, you can sharpen your knives to razor sharpness. It is very easy to make and only takes a few minutes.