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
NOT THE RING FINGER
Sometimes it is difficult to remove on finger tight ring, but much harder — pressed on the shaft bushing or bearing, Not accidentally creating a variety of devices. One of such devices...
IN A QUARTER OF A BRICK
Partitions of brick in construction are widely distributed. Without them it is difficult to do even in houses built of wood. In many cases, for example, in the construction of sanitary...
