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
“REICHENBERG” — A PLANE FOR THE GERMAN BOMBERS
In 1943 the situation of the Reich was not yet threatening: the front was far from his borders, and the Wehrmacht, with varying success, was fighting on foreign soil. However those...
“BURAN” AND SIX WHEELS
Powertrain with a CVT from a snowmobile "Buran". His power even enough that the ATV can tow a sled with firewood on the snow. Bridges, box: transfer case and change gear, the propeller...
