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
WINDOW SHELF
Pots of flowers standing on the windowsill, creates a room of beauty and comfort. However, if your Windows open inwards, the process of ventilation becomes a problem. Take a sheet...
SECRET CONE OF CONSOLES
It would seem, what can there be secrets? Many people use on flying models trapezoidal wings — it appears that the process of their manufacture is well established: two templates of the...
