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
AND AGAIN NUTRIT
On the mechanisms used to its movement due to inertia of the rotating imbalances of the journal "modelist-Konstruktor" wrote more than once (see number 5 and 12 for 1975, No. 6 1976, No....
FROM THE CHIP TO SOLDERING POTS
Often tan, what power you have at your disposal a soldering iron "barely enough" to firmly interconnect the major parts, say, or to patch the leaky bottom of the pan. Even pre-heating on...
