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
HANGER FOR BUCKET
In water columns or country water supply systems where the water pressure is generally weak, long hold the bucket to the shed and wait until it is filled, very tiring. Made of metal...
SHE WAS THE FIRST
Guided missile anti-aircraft missiles V-300. It was designed to defeat aircraft with a flight speed of 1500 km/h at altitudes from 5 to 25 km and at a distance of 35 km the First...
