There are special devices for sharpening dull or broken drill bits If they are not at hand then try under a rotating drill bit set suitable abrasive (e.g. abrasive wheel) at an angle of 30 or 45 degrees — and the drill will self-sharpening.
Recommend to read
MOWER GK-1
The reduction in the header is clear: GK — mower; unit refers to the width of one meter. So, without any complaints, called their machine with electric drive technology from a young city...
Mast without secrets
The mast is the foundation of the rig of any sailing tourist or sports craft, its most important unit. Its design and position determine sail area, configuration and aerodynamics, the...
