Very often, a broken drill should just throw it away because of the inability to even re-ground it. However, it can be converted into a punch. It is enough to the breaking point to make the angle marked in the figure. For such an operation better suited for the drill of large diameter. This punch will make it easier to obtain holes in concrete. Slightly after each hammer blow, the punch should be slightly rotated around the axis.
L. ANDARALO, M and n s K, Belarus
Recommend to read
AND FUEL DOES NOT FREEZE
In winter, the farmers and other owners of automotive vehicles, a lot of trouble to deliver diesel fuel. At low temperatures it becomes thick, it contained paraffin kristallizuetsya....
BUER “SNOWFLAKE”
Buernomu sport in the USSR has a long and glorious tradition. He was born before the revolution, but was at that time available only to a very narrow circle of rich people and General...
