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
M1117 replaced HMMWY
In the mid-1980s, the famous "jeep", many years in service with the us army, had to be substituted. Then the military picked the car М1025/М1026 (HMMWV - Hammer "Hummer") produced by AM...
TWO-HANDED — AS A HACKSAW
As proposed in the journal version of the work alone on the two-handed saw (with a rubber strap or tape) is not very suitable for winter, Thai rubber in the cold loses its elasticity....
