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
INSTEAD OF SHOVELS – MICROCABIN
"Hello, dear editors! Write "M" from 1969. Drawing magazine has fulfilled a number of projects. Pleased with them, that is, on all hundred. Particularly pleased with microtracker...
ACROSS THE FIELD SWEEPING PLOUGH
We offer our readers the plow rather unusual. It is not necessary to pull forward, neither a horse nor a tractor, and the now familiar motor-plow is selhozgodu clearly does not. It has...
