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
WITH SOAP AND WATER — EASY
Sawing boards solid wood, usually associated with jamming of the cutter, and its teeth bite into the material is hard, especially if you need to cut across layers. ...
Universal tractor
— How to explain such a "hybrid" — a two-wheeled mini-tractor and a single-axle cargo cart on a rigid hitch? Doesn't a mini-tractor have more capabilities with the same four wheels? —...
