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
PIŁA-PENDULUM
Arsenal machine tools home workshop, it is useful to fill up the circular saw. Pin CE on the workbench, next to the plumbing Vice, in which clamped the workpiece. Working tool saws —...
POURED “ON THE NECK”
Some plastic and metal containers — cans — sloping neckline. Of them conveniently pour out contents, and in this sense, the design, of course, justified. Also said to fill the canister...
