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
“LATE FLOWERS”
The situation by the end of 30-ies of the cruising forces of the Soviet Union, very much like the case of bygone days when the country was an Empire and was called Russia. Stalin and his...
“GODDESS”, THE CHARACTERS AND SYMBOLS
Few ocean giants — "Rurik", Gromoboy and Rossiya, though it presented a menace to navigation "ancestral enemy" — Britain in the case seemed such a possible war, but the scale of such...
