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
THE BEARING IN ONE PLACE
To install the ball bearing in the workplace, it is necessary to produce it under the special case that is often associated with certain difficulties. Here is one simplified but reliable...
BMW 645Ci Volga
Design domestic car GAZ-21 "Volga" is haunted by the many fans of this car. Some create precise scale models-copies of this iconic sedan. Others meticulously and carefully recreate the...
