When working in a workshop, sometimes you need to drill a large diameter hole in the metal - for example, 76 mm. Or maybe even several holes of different diameters. Buying bimetallic crowns for each hole is too expensive. And not for all diameters, you can buy them. What to do? See the answer in the video-making an adjustable metal drill bit with your own hands from available materials.
Enjoy your viewing!
1:02 What to make a drill bit from?
3:26 How to make a rectangular hole?
11: 17 First tests ))
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