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
THE WINGS OF THE PILE
Mechanical properties and geometry accuracy of load-bearing planes of flying models is largely dependent on technology, build their skeleton. The most known and widespread technique of...
CAR AMO F-15
CAR AMO F-15. Scale model 1:25. Car AMO-f 15 (1924-1931) was the development of the Italian truck FIAT-151ter. The first ten cars were collected from 1 to 6 November 1924 and was...
