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
LEARN “MORSE CODE”
Did you know that at the time shortwave Amateur radio communication, uniting hundreds of thousands of people in almost all countries of the globe, was to some extent the prototype of the...
RINGED HANDLE
Simple device — the plastic handle in the form of a groove — protects hands like reducing the weight of his burden. However, the trouble is, it has one unpleasant disadvantage — is often...
