Not everyone knows how to sharpen drills and the point is not that you have to do angle grinders or a similar tool, even to work with stationary emery you need a skill. All the tricks when sharpening drills at the right angle of the cutting edge.
If self-sharpening does not bring results, a makeshift device that works together with an emery can come to the rescue. The craft is a steel angle with tilt adjustment, which is mounted on a rotating hinge.
A drill is placed inside the corner, which can be fixed and sharpened both cutting edges in turn. Thanks to the swivel joint, correct and precise sharpening is obtained.